Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 254, NWS Birmingham, AL

May 26, 2011Blount County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at May 26, 2011, 4:51 PM CDT for Blount County, Alabama. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 26, 2011, 4:51 PM CDT (21:51 UTC)
Expired: May 26, 2011, 5:15 PM CDT
In force: 24 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

County Blount County, AL

The radar

The Northeast Alabama radar (KHTX), 102 km from the middle of the area, began a volume at 21:52 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 26, 9:15 AM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.9 hours before the alert went out and 103 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2103 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 485 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 7.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

414 
WUUS54 KBMX 262151
SVRBMX
ALC009-262215-
/O.NEW.KBMX.SV.W.0254.110526T2151Z-110526T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
451 PM CDT THU MAY 26 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN BLOUNT COUNTY IN ALABAMA...

* UNTIL 515 PM CDT

* AT 448 PM CDT...THE NATIONAL WEATHER SERVICE INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
  WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR ALLGOOD...
  OR NEAR ONEONTA...AND MOVING NORTHEAST AT 35 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SUSAN MOORE...BROOKSVILLE...STRAWBERRY...SNEAD...MCLARTY AND
  HENDRIX.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF
YOUR HOME OR BUSINESS.

&&

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.

LAT...LON 3427 8645 3410 8630 3405 8633 3398 8633
      3394 8637 3394 8633 3391 8635 3388 8634
      3383 8647 3409 8670 3412 8661 3422 8655
      3426 8649
TIME...MOT...LOC 2151Z 243DEG 31KT 3395 8647

$$

61

1 follow-up statement

243 
WWUS54 KBMX 262213 RRA
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
513 PM CDT THU MAY 26 2011

ALC009-262223-
/O.EXP.KBMX.SV.W.0254.000000T0000Z-110526T2215Z/
BLOUNT AL-
513 PM CDT THU MAY 26 2011

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BLOUNT COUNTY WILL
EXPIRE AT 515 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

TO REPORT SEVERE WEATHER...CALL 1-800-856-0758.

LAT...LON 3427 8645 3410 8630 3405 8633 3398 8633
      3394 8637 3394 8633 3391 8635 3388 8634
      3383 8647 3409 8670 3412 8661 3422 8655
      3426 8649
TIME...MOT...LOC 2213Z 243DEG 31KT 3403 8626

$$

61

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Birmingham, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 26, 3:33 PM CDT, 1 hour 18 minutes earlier.

Area forecast discussion, May 26, 3:33 PM CDT, 1 hour 18 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BIRMINGHAM AL
333 PM CDT THU MAY 26 2011

.DISCUSSION...

THE ADVERTISED SEVERE THUNDERSTORMS ARE ONGOING ACROSS THE AREA
RIGHT NOW SO WILL MAKE THIS SHORT AND SWEET. LOOKS LIKE A MCV HAS
DEVELOPED THIS AFTERNOON AND IS SLIDING NORTHWARD IN ADVANCE OF THE
COLD FRONT. THIS HAS TRIGGERED NUMEROUS SHOWERS AND THUNDERSTORMS
RESULTING IN LARGE HAIL AND WIND DAMAGE ACROSS THE EASTERN TWO
THIRDS OF THE AREA. AT THIS POINT IT APPEARS THAT THE BULK OF THE
ORGANIZED SEVERE THUNDERSTORMS WILL BE EAST OF CENTRAL ALABAMA BY 5
PM. WITH OVERALL COVERAGE DECREASING AND DAYTIME HEATING DECREASING
THE PLAN WITH SPC IS TO LET THE SEVERE THUNDERSTORM WATCH EXPIRE AT
5 PM...WITH ONLY A FEW ISOLATED STRONG TO SEVERE THUNDERSTORMS ALONG
THE COLD FRONT. AS THE FRONT MOVES INTO THE ALREADY WORKED OVER
AIRMASS WE SHOULD SEE THE INTENSITY DECREASE. UNTIL THEN THE THREAT
CONTINUES TO BE LARGE HAIL AND DAMAGING STRAIGHT LINE WINDS. THERE
IS MINIMAL IF ANY AT ALL ROTATION WITH THE STORMS ALONG THE LEADING
LINE.

BEHIND THE FRONT...DRYING IS EXPECTED ON FRIDAY AFTERNOON...WITH
TEMPERATURES REMAINING IN THE UPPER 80S AND LOW 90S AS THE RIDGE
MOVES BACK IN. THE NEXT FRONT WILL IMPACT THE AREA BY WEDNESDAY.

&&

.AVIATION...
18Z TAF DISCUSSION.

A SLOW MOVING COLD FRONT WILL PUSH INTO AREA THIS AFTERNOON AND
EVENING WITH SHRA AND TSRA FORMING ACROSS THE AREA IN ADVANCE OF
THE FRONT. EXPECT SCATTERED TO NUMEROUS TSRA INTO THE EVENING BUT
TIMING FOR INDIVIDUAL TAF SITES IS DIFFICULT SO WILL CARRY TEMPO
GROUPS INDICATING ANTICIPATED BEST WINDOW OF OPPORTUNITY. SOME
TSRA COULD BECOME STRONG WITH STRAIGHT LINE WINDS AND HAIL THE
MAIN CONCERN. EXPECT TSRA TO DIMINISH AFTER 00Z AS WE LOSE DAYTIME
HEATING AND SOMEWHAT DRIER MORE STABLE AIR SPREADS INTO AREA
BEHIND FRONT. GUIDANCE CONTINUES TO INDICATE IFR CONDITIONS
DEVELOPING TOWARD 12Z AND WITH TROUGHINESS HANGING IN THE AREA SEE
NO REASON TO DISCOUNT THIS HAPPENING. WILL INDICATE IFR CONDS 10Z-
14Z TIME FRAME WITH CONDITIONS IMPROVING RAPIDLY AFTER THAT TIME
AS MOIST NEAR SURFACE LAYER MIXES OUT. GUSTY SOUTHWEST WINDS THIS
AFTERNOON WILL DIMINISH AFTER 00Z AND GRADUALLY SHIFT TO MORE
WESTERLY OR NORTHWESTERLY DIRECTION BY 12Z.

NOTICE...KEET TAF WILL HAVE (AMD LTD TO VIS WIND AND WX) AMENDED
TO THE END OF THE FORECAST UNTIL FURTHER NOTICE. THE CEILOMETER
DATA WILL BE GOING THROUGH NUMEROUS TESTS AND MONITORED FOR
ACCURACY.

41

&&

.PRELIMINARY POINT TEMPS/POPS...
GADSDEN     60  83  57  89  64 /  40  10  10  10  10
ANNISTON    61  84  60  89  67 /  50  20  10  10  10
BIRMINGHAM  61  84  60  90  69 /  30  10  10  10  10
TUSCALOOSA  59  85  61  92  66 /  20  10  10  10  10
CALERA      61  84  62  91  66 /  30  10  10  10  10
AUBURN      63  85  67  90  68 /  60  30  10  10  10
MONTGOMERY  64  88  65  92  66 /  50  20  10  10  10
TROY        64  88  66  91  65 /  50  30   0  10  10

&&

.BMX WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

16/41

Hazardous weather outlook, May 26, 11:34 AM CDT, 5 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1134 AM CDT THU MAY 26 2011

ALZ011>015-017>050-270200-
AUTAUGA-BARBOUR-BIBB-BLOUNT-BULLOCK-CALHOUN-CHAMBERS-CHEROKEE-
CHILTON-CLAY-CLEBURNE-COOSA-DALLAS-ELMORE-ETOWAH-FAYETTE-GREENE-HALE-
JEFFERSON-LAMAR-LEE-LOWNDES-MACON-MARENGO-MARION-MONTGOMERY-PERRY-
PICKENS-PIKE-RANDOLPH-RUSSELL-SHELBY-ST CLAIR-SUMTER-TALLADEGA-
TALLAPOOSA-TUSCALOOSA-WALKER-WINSTON-
1134 AM CDT THU MAY 26 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COUNTIES SERVED BY THE
NATIONAL WEATHER SERVICE OFFICE IN BIRMINGHAM.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

SEVERE STORMS ARE POSSIBLE ACROSS MOST OF CENTRAL ALABAMA THROUGH
THE EARLY EVENING HOURS AS A COLD FRONT APPROACHES THE AREA.  THE
SEVERE ACTIVITY WILL BE MAINLY ALONG AND EITHER SIDE OF THE I-59
CORRIDOR.  THE MAIN THREATS WILL BE DAMAGING STRAIGHT-LINE WINDS...
LARGE HAIL...AND CLOUD-TO-GROUND LIGHTNING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT WILL BE
NECESSARY TODAY.

In the hours before

Local storm report, May 26, 3:44 PM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
344 PM CDT THU MAY 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0314 PM     HAIL             WEAVER                  33.76N 85.81W
05/26/2011  E0.88 INCH       CALHOUN            AL   AMATEUR RADIO

0335 PM     TSTM WND GST     2 N SEALE               32.33N 85.17W
05/26/2011  M55 MPH          RUSSELL            AL   TRAINED SPOTTER

            TIME ESTIMATED FROM RADAR.

&&

JTALLEY

Local storm report, May 26, 4:00 PM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
400 PM CDT THU MAY 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0259 PM     HAIL             1 ENE FAIRFIELD         33.48N 86.89W
05/26/2011  E0.88 INCH       JEFFERSON          AL   AMATEUR RADIO

            TIME ESTIMATED FROM RADAR.

0338 PM     HAIL             5 NE TRUSSVILLE         33.70N 86.54W
05/26/2011  E1.00 INCH       JEFFERSON          AL   CO-OP OBSERVER

&&

JTALLEY

Local storm report, May 26, 4:08 PM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
408 PM CDT THU MAY 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0345 PM     TSTM WND DMG     PHENIX CITY             32.47N 85.01W
05/26/2011                   RUSSELL            AL   PUBLIC

            STEEL ROOFING OFF OF A CHURCH AT 16TH AND BROAD.

0400 PM     HAIL             ASHVILLE                33.83N 86.26W
05/26/2011  E1.00 INCH       ST. CLAIR          AL   PUBLIC

&&

JTALLEY

Local storm report, May 26, 4:23 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
423 PM CDT THU MAY 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0308 PM     TSTM WND DMG     3 E SYLACAUGA           33.18N 86.21W
05/26/2011                   TALLADEGA          AL   EMERGENCY MNGR

            SEVERAL TREES REPORTED DOWN. TIME ESTIMATED FROM RADAR.

0325 PM     TSTM WND DMG     HACKNEYVILLE            33.06N 85.93W
05/26/2011                   TALLAPOOSA         AL   LAW ENFORCEMENT

            TREES DOWN.

&&

JTALLEY

Local storm report, May 26, 4:35 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
435 PM CDT THU MAY 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0415 PM     HAIL             4 NNE HOKES BLUFF       34.05N 85.85W
05/26/2011  E1.75 INCH       ETOWAH             AL   PUBLIC

&&

JTALLEY

Local storm report, May 26, 4:41 PM CDT, 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
441 PM CDT THU MAY 26 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0436 PM     TSTM WND DMG     CENTRE                  34.15N 85.67W
05/26/2011                   CHEROKEE           AL   AMATEUR RADIO

            TOPS SNAPPED OFF OF SOME TREES. WINDS ESTIMATED TO BE
            ABOUT 60 MPH.

&&

JTALLEY

The office that day

Everything else NWS Birmingham, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 25, 10:56 PM CDT	Special Weather Statement	BMX	Marion	49 min
May 25, 11:25 PM CDT	Special Weather Statement	BMX	Lamar	50 min
May 25, 11:35 PM CDT	Special Weather Statement	BMX	Winston	40 min
May 26, 12:18 AM CDT	Special Weather Statement	BMX	Fayette, Walker, Winston	42 min
May 26, 12:32 AM CDT	Severe Thunderstorm Warning	BMX	Winston	28 min
May 26, 12:50 AM CDT	Severe Thunderstorm Warning	BMX	Walker	14 min
May 26, 1:22 AM CDT	Severe Thunderstorm Warning	BMX	Lamar, Pickens	38 min
May 26, 2:10 AM CDT	Special Weather Statement	BMX	Fayette, Walker, Winston	50 min
May 26, 2:40 AM CDT	Special Weather Statement	BMX	Fayette	50 min
May 26, 2:49 AM CDT	Special Weather Statement	BMX	Jefferson, Tuscaloosa	41 min
May 26, 3:20 AM CDT	Special Weather Statement	BMX	Walker	40 min
May 26, 7:43 AM CDT	Special Weather Statement	BMX	Coosa	47 min
May 26, 7:48 AM CDT	Special Weather Statement	BMX	Marion	27 min
May 26, 8:41 AM CDT	Special Weather Statement	BMX	Calhoun, Cherokee	49 min
May 26, 12:21 PM CDT	Severe Thunderstorm Warning	BMX	Marengo	24 min
May 26, 1:07 PM CDT	Severe Thunderstorm Warning	BMX	Dallas	38 min
May 26, 1:14 PM CDT	Severe Thunderstorm Warning	BMX	Lowndes, Montgomery	46 min
May 26, 1:20 PM CDT	Special Weather Statement	BMX	Etowah, St. Clair	40 min
May 26, 1:27 PM CDT	Special Weather Statement	BMX	Cherokee	48 min
May 26, 1:32 PM CDT	Severe Thunderstorm Warning	BMX	Chilton	43 min
May 26, 1:35 PM CDT	Special Weather Statement	BMX	Jefferson	40 min
May 26, 1:37 PM CDT	Severe Thunderstorm Warning	BMX	Cherokee	23 min
May 26, 1:52 PM CDT	Severe Thunderstorm Warning	BMX	Elmore, Lowndes, Montgomery	38 min
May 26, 1:56 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Etowah	49 min
May 26, 2:10 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Pike	33 min
May 26, 2:16 PM CDT	Areal Flood Advisory	BMX	Autauga, Elmore, Lowndes, Montgomery	119 min
May 26, 2:20 PM CDT	Severe Thunderstorm Warning	BMX	Autauga, Chilton, Coosa, Elmore	40 min
May 26, 2:28 PM CDT	Severe Thunderstorm Warning	BMX	Bullock, Macon, Russell	32 min
May 26, 2:31 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah	44 min
May 26, 2:47 PM CDT	Severe Thunderstorm Warning	BMX	Macon, Montgomery	13 min
May 26, 2:51 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Coosa, Talladega, Tallapoosa	24 min
May 26, 2:52 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Talladega	23 min
May 26, 2:57 PM CDT	Severe Thunderstorm Warning	BMX	Macon	18 min
May 26, 3:08 PM CDT	Severe Thunderstorm Warning	BMX	Jefferson, St. Clair, Shelby	40 min
May 26, 3:15 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Cherokee, Cleburne, Etowah	45 min
May 26, 3:21 PM CDT	Severe Thunderstorm Warning	BMX	Clay, Tallapoosa	24 min
May 26, 3:35 PM CDT	Severe Thunderstorm Warning	BMX	Chambers	25 min
May 26, 3:36 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair	39 min
May 26, 3:40 PM CDT	Severe Thunderstorm Warning	BMX	Russell	35 min
May 26, 3:45 PM CDT	Severe Thunderstorm Warning	BMX	Blount, Jefferson, Walker	45 min
May 26, 3:51 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens, Sumter	24 min
May 26, 3:53 PM CDT	Severe Thunderstorm Warning	BMX	Greene, Pickens	26 min
May 26, 3:54 PM CDT	Severe Thunderstorm Warning	BMX	Chambers, Randolph	36 min
May 26, 4:08 PM CDT	Severe Thunderstorm Warning	BMX	Calhoun, Etowah, St. Clair	52 min
May 26, 4:23 PM CDT	Severe Thunderstorm Warning	BMX	Cherokee	52 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.