ABC 33/40 Weather Blog

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The latest information on Alabama weather, tornadoes, hurricanes, winter storms, national weather headlines and the science of meteorology in general.
Updated: 16 min 39 sec ago

The Andover Tornado of 1991

1 hour 16 min ago

On this day 24 years ago, an F5 tornado devastated the community of Andover, Kansas, in a violent tornado outbreak over the plains of Kansas, Oklahoma and Nebraska. On April 26, 1991, a total of 55 tornadoes developed, 30 of which were rated an F2 or greater. At one point during the storm, three separate F4 or F5 tornadoes – Andover, Red Rock, and Arkansas City – were simultaneously on the ground. 21 people died as a direct result of the April 26, 1991 severe weather – 17 from one storm alone.

While the April 26, 1991 storm is most known for the destruction of the Andover community, this same twister also hit parts of Wichita, McConnell Air Force Base and other parts of South Central Kansas. The following devastating tornadoes occurred primarily during the afternoon and evening hours across northern Oklahoma and southern Kansas.

The Andover tornado initially exhibited multiple vortices, producing F3 damage. As it veered north, it bore down on Haysville, Kansas, just south of Wichita. It passed through the southeastern part of Wichita, passing just a mile south of the South Wichita interchange on the Kansas Turnpike. McConnell Air Force Base was next on the tornado’s agenda. The twister crossed the Base’s runways and missed a billion dollar line of B-1B bombers by less than one thousand feet. The southern part of the Base received F2-F3 damage. The Officer’s Club, Base Hospital and base housing were heavily damaged. But the tornado was growing in size and intensity.

A subdivision near the Sedgwick County/Butler County line was nearly completely leveled as the tornado grew to its highest intensity. As the tornado turned into an F5 monster, it set its sights on the Golden Spur Mobile Home Park in Andover about 6:45 p.m. Warnings mentioning Andover specifically were issued seven minutes before the tornado arrived; however, the sirens in Andover were not working. A police cruiser drove through the park sounding its sirens as a warning. Many of the residents had heard about the approaching tornado from local television coverage and headed to the park’s storm shelter. Others said they would not take shelter until the funnel was visible. Fortunately, the tornado was slow moving and highly visible, and many made it to shelter in time. Over 200 people were huddled in the shelter when the twister struck, annihilating 233 of the 241 homes. The tornado obliterated the mobile home community, killing thirteen people. Twisted frames were the only remains of many of the mobile homes.

The tornado thankfully moved into more rural territory northeast of Andover, crossing the Kansas Turnpike. Near El Dorado, the tornado literally bounced a huge oil tank over a half mile. When the tornado finally lifted about five miles north of El Dorado, it had been on the ground for forty five miles. A total of seventeen people in the Andover community lost their lives. Right after the Andover tornado lifted, the same storm produced another tornado that was captured on news video as it passed near on overpass on the Kansas Turnpike, which enforced the false belief that overpasses could provide safe shelter during tornadoes.

Categories: Weather

Large Tornado on the Ground Near Comanche, Texas

1 hour 28 min ago

By Bill Murray, 3:58 pm Sunday

Spotters report a large tornado on the ground near Comanche, Texas this afternoon. This is a little more than 100 miles southwest of Dallas.

FWD issues Tornado Warning [tornado: OBSERVED, tornado damage threat: CONSIDERABLE, hail: 4.25 IN] for Comanche [TX] till 4:45 PM CDT …AT 356 PM CDT…A CONFIRMED LARGE AND EXTREMELY DANGEROUS TORNADO WAS LOCATED 7 MILES NORTHWEST OF COMANCHE…MOVING EAST AT 30 MPH.

Categories: Weather

Sunny and Warm Sunday

9 hours 21 min ago

No Weather Xtreme Video this morning since I am providing weather support to the Honda Indy Grand Prix of Alabama at the Barber Motorsports Park.

Much calmer weather expected for Central Alabama today after a challenging weather situation yesterday. Morning low clouds will give way to sunshine this morning with a mostly sunny afternoon expected. Look for highs to climb into the lower 80s across nearly all of Central Alabama even though a weak cold front will be moving through the Southeast US. Much of the moisture was wrung out of the atmosphere yesterday and there is little convergence with the front to force showers. The front will also usher in slightly drier air later today, so all in all a great Sunday for Central Alabama. Showers are still possible across South Alabama and the northern Gulf Coast.

Central Alabama will be between systems on Monday with a closed low over the Canadian Maritimes and a closed low over the southern Rockies. This closed low will be slow to come our way with Tuesday the day for the weather to change as clouds increase and rain chances go up late in the day as rain advances across the Southeast US. The closed low will open up late Tuesday and Wednesday so I expect to see a good deal of cloudiness along with periods of rain for Wednesday as a surface low moves along the northern Gulf. With the low so far south, I do not expect to see any severe weather with this rainy period.

As the upper trough moves by early Thursday, we should see improving weather for the end of the week and into the weekend, great news for the races at Talladega next weekend. After a cool couple of days Tuesday and Wednesday, temperatures should climb back into the 70s for the end of the week and into the weekend as surface high pressure settles into the eastern US and the Southeast US.

Beach goers will have to contend with chances for showers through the middle of the week, but the weather should turn much better after midweek as that surface low moves east. Temperatures will be in the upper 70s for highs today and Monday, but Tuesday and Wednesday will be slightly cooler thanks to lots of clouds and better rain chances with highs in the lower 70s. Highs return to near 80 for the end of the week and the weekend.

Looking out into voodoo country, another strong trough will move across the Great Lakes around the 5th of May which is expected to bring a front along with rain chances back into the forecast. After a break in the weather another trough will bring another front to the Southeast around the 11th. So the weather pattern remains fairly active as we head into May.

Looking forward to ending a rather busy weekend with weather and the events at Barber Motorsports Park. James Spann will have the next edition of the Weather Xtreme Video first thing on Monday. Enjoy your Sunday!

-Brian-

Categories: Weather

Severe Cyclone Monica

Sat, 04/25/2015 - 19:52

On this date in 2006, Severe Cyclone Monica spared the Darwin area as it curved into land early along the North Coast of Australia, making landfall in a sparsely populated area.

At the time of landfall, the cyclone had an estimated central pressure of 879 millibars. If this estimate is correct, it would make Monica the strongest tropical cyclone ever in the southern hemisphere.

Of course, reconnaissance aircraft are only used in the Atlantic, so we will never know for sure. Typhoon Tip (1970) is the strongest typhoon ever observed on earth.

Categories: Weather

Is the Severe Weather Over for Central Alabama? Yes!

Sat, 04/25/2015 - 18:35

Yes!

The severe thunderstorm watch for East Central Alabama has been canceled as the last storms have moved into Georgia and no addiitonal storms are expected overnight.

We had one shot at severe weather this afternoon and evening across Central Alabama and it is done.

The ingredients that were in place over the area are diminishing now. The speed shear is diminishing as the upper level wind max departs to the north. Instabilities are slowly coming down as clouds cover the area. The convection near the Gulf Coast has effectively cut off additional moisture inflow into the area and drier air is moving in.

There should not be any more convection initiating tonight. There could be a few light showers as the cold front approaches from the north during the pre-dawn hours, but there won’t be any thunder.

A passing disturbance and conditionally unstable air caused by cold air aloft tomorrow could trigger a few light afternoon showers as well, but they will be a nuisance at worst, not heavy and not lasting very long at all.

Categories: Weather

Coosa County Damage Photos

Sat, 04/25/2015 - 18:22

@auburnwde reported destruction of a barn in northern Coosa County caused by strong winds in the severe thunderstorm at 5:18 pm, four miles west of Stewartville on County Road 35. The damage is impressive and could have been caused by a tornado or straight line winds, hard to tell until the Weather Service surveys the damage. There were definitely strong winds, over 65 mph near the surface, shown on doplar radar.

Categories: Weather

All Central Alabama Warnings Over

Sat, 04/25/2015 - 17:51

The severe thunderstorm warning for Coosa and Talladega Counties has been canceled or has expired.

There are no warnings in effect now for any part of Central Alabama.

A severe thunderstorm watch remains in effect until 10 p.m. for Barbour, Pike, Bullock, Chambers, Clay, Lee, Macon, Randolph, Russell and Tallapoosa Counties.

The only storms over Central Alabama are the ones over East Central Alabama in Clay and Tallapoosa Counties moving into Randolph.

Categories: Weather

Severe Thunderstorm Warning: Coosa til 6 p.m.

Sat, 04/25/2015 - 17:07

UPDATE AT 5:29
Talladega County has been removed from the warning since the storms have moved out of the county.

ORIGINAL POST
The NWS has issued a severe thunderstorm warning for Talldega and Coosa Counties until 6 p.m.

Strong thunderstorm near Talladega Springs will pass near Stewartville, Gantts Quarry and Overbrook and south of Sylacauga. It will eventually move toward Goodwater, Kellyotn and Alex City.

Hail to one inch and 60 mph winds are possible with this storm. 65 mph winds are indicated on base velocity products south of Talladega Springs at 1,000 feet. This is easily reaching the ground in the rear flank downdraft

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR…
SOUTHWESTERN TALLADEGA COUNTY IN EAST CENTRAL ALABAMA…
NORTHERN COOSA COUNTY IN EAST CENTRAL ALABAMA…

* UNTIL 600 PM CDT

* AT 505 PM CDT…A SEVERE THUNDERSTORM WAS LOCATED OVER LAY LAKE…
OR NEAR TALLADEGA SPRINGS…MOVING EAST AT 45 MPH.

HAZARD…60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

SOURCE…RADAR INDICATED.

IMPACT…HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE
TO ROOFS…SIDING AND TREES.

* LOCATIONS IMPACTED INCLUDE…
SYLACAUGA…GOODWATER…KELLYTON…TALLADEGA SPRINGS…WEOGUFKA…
STEWARTVILLE…FAYETTEVILLE…CREWSVILLE…BRADFORD…UNITY…
HATCHET…BENTLEYVILLE…HANOVER…MARBLE VALLEY…PARKDALE…
STRICKLAND CROSSROADS…LAY LAKE…CEDAR CREEK…OVERBROOK AND
SHELBY SHORES.

GRANTHAM

Categories: Weather

Reports From the Birmingham Area

Sat, 04/25/2015 - 17:02

Strong storms are impacting Jefferson and Shelby Counties now with heavy rain and lightning as well as gusty winds. There have been reports of some small hail.

Some reports…

…Hail and heavy rain reported in Vestavia by @AUAtty
…I picked up 0.50 inches of rain in less than 30 minutes off Altadena Road. 1.16 so far since midnight.
…Heavy rain on Highway 150 in Hoover flooded the road in 10 minutes. Strong winds too according to @ProddyLeigh
…Power lines sparking on 280 at Parc at Grandview.
…Jeff Drake reports 0.60 inches of rain in 15 minutes at Bessemer.

Categories: Weather

Severe Thunderstorm Watch Still For East Central Alabama

Sat, 04/25/2015 - 16:41

UPDATED MAP 6:12 PM

UPDATE 6:02 PM
Barbour, Pike, Bullock, Macon and Russell Counties have been dropped from the Severe Thunderstorm Watch. The watch continues for Chambers, Clay, Lee, Randolph and Tallapoosa Counties until 10:00 PM CDT

ORIGINAL POST
The NWS has extended the Severe Thunderstorm Watch over South Alabama northward to include part of East Central Alabama.

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
115 IN EFFECT UNTIL 10 PM CDT THIS EVENING FOR THE FOLLOWING
AREAS

IN ALABAMA THIS WATCH INCLUDES 8 COUNTIES

IN EAST CENTRAL ALABAMA

CHAMBERS CLAY LEE
MACON RANDOLPH RUSSELL
TALLAPOOSA

IN SOUTHEAST ALABAMA

BULLOCK

THIS INCLUDES THE CITIES OF…ALEXANDER CITY…ASHLAND…AUBURN…
LANETT…LINEVILLE…OPELIKA…PHENIX CITY…ROANOKE…TUSKEGEE…
UNION SPRINGS AND VALLEY.

=

Categories: Weather

Severe Thunderstorm Warning

Sat, 04/25/2015 - 16:16

This is the text of a severe warning from the National Weather Service for part of the AlabamaWX.com coverage area. Standby for more details to be added to this post by our meteorologists.
WUUS54 KBMX 252115
SVRBMX
ALC113-252215-
/O.NEW.KBMX.SV.W.0058.150425T2115Z-150425T2215Z/

BULLETIN – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
415 PM CDT SAT APR 25 2015

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR…
RUSSELL COUNTY IN SOUTHEASTERN ALABAMA…

* UNTIL 515 PM CDT

* AT 415 PM CDT…A SEVERE THUNDERSTORM WAS LOCATED NEAR SPRING
HILL…OR 8 MILES EAST OF MIDWAY…MOVING NORTHEAST AT 45 MPH.

HAZARD…60 MPH WIND GUSTS AND QUARTER SIZE HAIL.

SOURCE…RADAR INDICATED.

IMPACT…HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE
TO ROOFS…SIDING AND TREES.

* LOCATIONS IMPACTED INCLUDE…
HURTSBORO…SEALE…RUSSELL COUNTY SPORTS COMPLEX…RUTHERFORD…
TWIN SPRINGS…HATCHECHUBBE…FORT MITCHELL…FORT MITCHELL
ACTIVITY CENTER AND UCHEE CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT…LON 3225 8492 3222 8493 3222 8497 3220 8496
3218 8501 3213 8506 3209 8505 3206 8506
3206 8519 3215 8526 3215 8543 3225 8543
3245 8499 3244 8497 3239 8497 3238 8499
3238 8497 3233 8501 3226 8489
TIME…MOT…LOC 2115Z 238DEG 40KT 3212 8539

HAIL…1.00IN
WIND…60MPH

$$

GRANTHAM

Categories: Weather

Heavy Storms in Tuscaloosa County, Not Severe

Sat, 04/25/2015 - 16:04

Heavy thunderstorms have developed this afternoon across Tuscaloosa County in West Alabama. They are not severe, but they do have lot sof lightning and heavy rain as well as gusty winds.

They are moving ENE and will move into Jefferson County shortly. They will reach downtown Birmingham before 4:30.

Across South Central Alabama, storms were developing across Perry and Bibb County, moving toward Clanton.

The SPC has moved the slight risk severe weather outlook southward about 50 miles, sort of as expected. It is depicted in the radar graphic as a yellow line extending from Grove Hill to Centreville to Columbiana and Talladega. The dark green line indicates the northward extent of the Marginal Risk and the light green line delineates the northern extent of the threat of storms.

South of US-82, CAPE values are over 2,000 j/kg giving the storms plenty of octane to work with. There is strong speed shear as well. Mid-level lapse rates are moderately strong as well. But there is almost no low level helicity, so tornadoes are not an issue for now. Overall moisture levels have dropped over North Central Alabama as the special balloon release from BMX indicated at 1 p.m. But low level dewpoints are still quite juicy, running in the upper 60s and lower 70s.

Storms over South Alabama are stronger, including a couple of severe ones. Two severe thunderstorm watches cover South Alabama, but one has not been issued for South Central Alabama yet. Winds gusted to 59 mph at Fairhope when the storms were over Mobile Bay.

Categories: Weather

Severe Thunderstorm Warning

Sat, 04/25/2015 - 15:44

This is the text of a severe warning from the National Weather Service for part of the AlabamaWX.com coverage area. Standby for more details to be added to this post by our meteorologists.
WUUS54 KBMX 252043
SVRBMX
ALC005-252145-
/O.NEW.KBMX.SV.W.0057.150425T2043Z-150425T2145Z/

BULLETIN – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
343 PM CDT SAT APR 25 2015

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR…
BARBOUR COUNTY IN SOUTHEASTERN ALABAMA…

* UNTIL 445 PM CDT

* AT 342 PM CDT…A SEVERE THUNDERSTORM WAS LOCATED NEAR BOOT HILL…
OR 12 MILES SOUTHWEST OF MIDWAY…MOVING EAST AT 40 MPH.

HAZARD…60 MPH WIND GUSTS AND HALF DOLLAR SIZE HAIL.

SOURCE…RADAR INDICATED.

IMPACT…HAIL DAMAGE TO VEHICLES IS EXPECTED. EXPECT WIND DAMAGE
TO ROOFS…SIDING AND TREES.

* LOCATIONS IMPACTED INCLUDE…
EUFAULA…CLAYTON…LOUISVILLE…GAINO…WHITE OAK…BOOT HILL…
COMER…OSCO…HAWKINSVILLE…BARBOUR COUNTY PUBLIC LAKE DAM…
SPRING HILL…LAKEPOINT RESORT STATE PARK…CLAYTON MUNICIPAL
AIRPORT…MOUNT ANDREW…MILLERS FORD…LUGO…BAKER HILL…TWIN
SPRINGS AND BATESVILLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT…LON 3197 8506 3196 8509 3194 8508 3190 8511
3189 8513 3179 8514 3175 8567 3186 8568
3191 8565 3200 8559 3200 8551 3201 8551
3202 8547 3202 8543 3214 8543 3215 8526
3206 8519 3207 8511 3206 8506 3202 8505
TIME…MOT…LOC 2042Z 247DEG 37KT 3193 8566

HAIL…1.25IN
WIND…60MPH

$$

GRANTHAM

Categories: Weather

One Severe Thunderstorm Watch Already, Maybe Another Soon

Sat, 04/25/2015 - 14:29

By Bill Murray, 2:25 p.m. Saturday

An approaching upper level disturbance coming across southeastern Louisiana and southern Mississippi this afternoon. Strong thunderstorms extend now from Southwest Alabama through southern Mississippi into southeastern Louisiana. This system has weakened in the past hour or so but still pose a threat as they move into unstable air.

But a severe thunderstorm watch has been issued for South Alabama and Northwest Florida downstream of this activity.

Storms that formed on the northern edge of the area of rain and storms have weakened as well. But the SPC is monitoring conditions across South Central Alabama where instabilities have risen to over 1,500 j/kg south of US-82. Strong wind shear will produce organized thunderstorms, including supercells. Low level helicities are not high, so damaging winds and hail are the main threats, not tornadoes.

There could be an additional severe thunderstorm watch to the north of the new one over South Alabama.

Overall, the situation looks better for areas north of I-20, with little to no storm development expected. South of I-20, we will continue to be watching the latest developments all afternoon and evening.

Categories: Weather

Storms Already Developing in Eastern Mississippi

Sat, 04/25/2015 - 13:19

By Bill Murray, Saturday 120 pm

A strong thunderstorm has developed over eastern Mississippi between Philadelphia and Meridian. It is moving northeast and will impact Sumter and southern Pickens Counties starting between 1:30 and 2 p.m. They are not severe for now but are in an environment of moderate instability with decent wind shear so they will persist into Alabama. They are being triggered by an upper level disturbance that is crossing the Mississippi River out of Louisiana. There is also some enhancement from an upper level jet streak just to the west.

South of US-82, CAPE values are already at 1,000 j/kg or greater. They will continue to increase through the afternoon as sun works on a moist atmosphere to create more instability. The storms back to the southwest of this leading activity will cut off moisture inflow from the Gulf, so the storms may have to work with what they have available. But dewpoints are already in the upper 60s so that may not be much of a problem.

There will be scattered storms to severe storms over Central Alabama this afternoon. The SPC slight risk severe weather outlook boundary is shown in yellow on the graphic. Areas south of that have the best chances for severe storms to develop this afternoon and evening. I don’t expect there will be much severe activity to the north of areas within 25-50 miles of I-20. Damaging winds and hail look likely. There is a small chance of a tornado, but with southwesterly surface winds, the chance is minimized.

Stay tuned for the latest severe weather information throughout the afternoon and evening.

Categories: Weather

Some Notes on Our Situation

Sat, 04/25/2015 - 09:27

By Brian Peters
9:27 AM Saturday

First, I am unable to prepare a Weather Xtreme Video because I am providing weather support to the Honda Indy Grand Prix of Alabama at Barber Motorsports Park in Birmingham. My ‘office’ is an open area with numerous people checking on the latest weather, so the video would be horrible. But I thought I would post a couple of notes about the weather for Central Alabama today.

SimuAWIPS image showing region radar (top left), current instability (bottom left) and visible satellite and surface observations (right panel).

First, a large cluster of thunderstorms moved through Central Alabama early this morning helping to stabilize the atmosphere for the time being. By working over the atmosphere so much, it has helped to reduce to some extent the threat of a second round of thunderstorms. The sounding from BMX at 12Z this morning showed a CAPE value of only 6 in the wake of this cluster. In addition to this, another large cluster of storms over Southeast Texas and Southwest Louisiana was producing some additional clouds which may help to reduce the daytime heating across Central Alabama which could conceivably aid in lowering any destabilization of the atmosphere late this morning and into the afternoon. As this cluster moves eastward along the Gulf Coast, it may help to disrupt the moist southerly flow further northward.

Supporting additional development today is the fact that the upper trough axis still remains to our west and northwest. SPC has an enhanced risk of severe thunderstorms in the Ohio River Valley just ahead of this trough. And the GFS continues to project moderately high instabilities over 3,000 j/kg with scattered thunderstorms developing.

Satellite imagery this morning also shows some breaks in the clouds across Central Alabama and Central Mississippi. These breaks will allow for heating of the near surface layer and help with destabilization. I have noticed, however, that the lower clouds have closed off some of the breaks which may slow the destabilizing process.

The HRRR model shows additional thunderstorms developing into the early afternoon, so we will need to be vigilant for this development. The HRRR model continued to trend toward less development into the afternoon for Central Alabama while the NAM continued to be more robust in the development of thunderstorms. The best time period for additional development still remains from the early afternoon into the early evening generally from about 1 to 9 pm. While thunderstorms may not be widespread, those that do develop could pack a good punch!

As always, be weather safe and be sure to have a way to get weather warnings. Stay tuned to the Blog for further updates.

-Brian-

Categories: Weather

Stay Weather Aware: More Severe Storms Possible This Afternoon

Sat, 04/25/2015 - 09:23

The final counties in Central Alabama have been cleared from Tornado Watch 108 but more severe weather is possible this afternoon.

the area remains under a slight risk severe weather outlook from the Storm Prediction Center for the threat of additional severe weather this afternoon and evening.

Scattered storms will form this afternoon and the environment will be conducive for severe weather with moderately high instability. The best window for storm development will be between 1-9 p.m. today. Most of the storms will form after 3 p.m. The SPC has areas south of a line from Vernon to Double Springs to Falkville to Scottsboro outlooked for severe weather through the day and into tonight.

Here is the 4km NAM’s depiction of what the radar might look like at 7 p.m. when CAPE values are still running over 3,000 j/kg over North Central Alabama:

A caveat: the HRRR model is not as robust with the instability environment or the storms, so this forecast is heavily laden with uncertainty. We will just have to keep a close eye on mesoscale trends through the afternoon. One key factor will be cloud cover and how much the lower atmosphere can heat up. Temperatures this afternoon are forecast to reach the upper 70s to near 80F.

Skies are clearing partially in a southwest to northeast swath that you can see on visible satellite this morning. Temperatures are cool, in the 60s and there is no instability north of US-80 for now but as breaks in the clouds allow things to heat up, the airmass will become unstable. There is plenty of moisture. We will be in the favorable right rear quadrant of a strong upper level wind maximum, which is favorable for diffluence aloft to support thunderstorm updrafts. There will be plenty of speed shear, or difference in wind speed with height, so the storms will be able to stay organized. There will be sufficient low level shear to produce the threat of tornadoes as well.

So, while the storms may not be widespread, the ones that do form will have the potential to produce damaging winds, hail and tornadoes.

Categories: Weather

The First TDS Warning

Sat, 04/25/2015 - 09:00


Photo from @UAHSWIRLL

In 2002, a WSR-74C radar was donated to the University of Alabama – Huntsville. The radar is called ARMOR: the Advanced Radar for Meteorological and Operational Research.

In 2004, it was upgraded to dual-polarization capability. Radars typically send out and receive their electronic signals in the horizontal plane only. Dual-pol adds the vertical plane. This gives meteorologists quite a bit more data about the targets that the radar is “seeing” in the atmosphere, including size and shape. This can be very helpful in determining precipitation type and amounts.

One thing that researchers have found is that the data can sometimes differentiate the signature of debris being lofted into the air by a tornado that is on the ground. This can help confirm that a tornado is occurring when ground truth reports aren’t available, a great thing at night and in remote locations, or where terrain and trees limit visibility. The signature is called a Tornadic Debris Signature (TDS). We use them all the time today. There was clear evidence of one last night in Central Mississippi for example.

Researchers at UAH documented the first TDS in February 2008 in a pre-dawn F4 tornado during the Super Tuesday Outbreak in North Alabama.

On this date, meteorologists at UAH provided their first real time reports of a tornadic debris signature to the NWS to help issue a tornado warning for Marshall County in North Alabama as a tornado was doing damage in Albertville.

Categories: Weather

Watch County Notification

Sat, 04/25/2015 - 07:29

This is the text of a severe warning from the National Weather Service for part of the AlabamaWX.com coverage area. Standby for more details to be added to this post by our meteorologists.
WWUS64 KBMX 251228
WCNBMX

WATCH COUNTY NOTIFICATION FOR WATCH 108
NATIONAL WEATHER SERVICE BIRMINGHAM AL
728 AM CDT SAT APR 25 2015

ALC101-251330-
/O.CAN.KBMX.TO.A.0108.000000T0000Z-150425T1700Z/

THE NATIONAL WEATHER SERVICE HAS CANCELLED TORNADO WATCH 108 FOR
THE FOLLOWING AREAS

IN ALABAMA THIS CANCELS 1 COUNTY

IN CENTRAL ALABAMA

MONTGOMERY

THIS INCLUDES THE CITIES OF…MONTGOMERY.

$$

ALC005-011-087-109-113-251700-
/O.CON.KBMX.TO.A.0108.000000T0000Z-150425T1700Z/

TORNADO WATCH 108 REMAINS VALID UNTIL NOON CDT TODAY FOR THE
FOLLOWING AREAS

IN ALABAMA THIS WATCH INCLUDES 5 COUNTIES

IN EAST CENTRAL ALABAMA

MACON RUSSELL

IN SOUTHEAST ALABAMA

BARBOUR BULLOCK PIKE

THIS INCLUDES THE CITIES OF…EUFAULA…PHENIX CITY…TROY…
TUSKEGEE AND UNION SPRINGS.

$$WWWW

Categories: Weather

Watch County Notification

Sat, 04/25/2015 - 06:34

This is the text of a severe warning from the National Weather Service for part of the AlabamaWX.com coverage area. Standby for more details to be added to this post by our meteorologists.
WWUS64 KBMX 251129
WCNBMX

WATCH COUNTY NOTIFICATION FOR WATCHES 106/108
NATIONAL WEATHER SERVICE BIRMINGHAM AL
629 AM CDT SAT APR 25 2015

ALC047-251230-
/O.CAN.KBMX.TO.A.0106.000000T0000Z-150425T1300Z/

THE NATIONAL WEATHER SERVICE HAS CANCELLED TORNADO WATCH 106 FOR
THE FOLLOWING AREAS

IN ALABAMA THIS CANCELS 1 COUNTY

IN CENTRAL ALABAMA

DALLAS

THIS INCLUDES THE CITIES OF…SELMA.

$$

ALC001-005-011-051-085-087-101-109-113-251700-
/O.CON.KBMX.TO.A.0108.000000T0000Z-150425T1700Z/

TORNADO WATCH 108 REMAINS VALID UNTIL NOON CDT TODAY FOR THE
FOLLOWING AREAS

IN ALABAMA THIS WATCH INCLUDES 9 COUNTIES

IN CENTRAL ALABAMA

AUTAUGA ELMORE LOWNDES
MONTGOMERY

IN EAST CENTRAL ALABAMA

MACON RUSSELL

IN SOUTHEAST ALABAMA

BARBOUR BULLOCK PIKE

THIS INCLUDES THE CITIES OF…EUFAULA…FORT DEPOSIT…
LOWNDESBORO…MILLBROOK…MONTGOMERY…PHENIX CITY…PRATTVILLE…
TROY…TUSKEGEE…UNION SPRINGS AND WETUMPKA.

$$WWWW

Categories: Weather