Alert archive / Alabama / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 84, NWS Birmingham, AL

April 1, 2009St. Clair County, Shelby County, Talladega County, Alabama

NWS Birmingham, AL issued this severe thunderstorm warning at Apr 1, 2009, 12:57 AM CDT for St. Clair County, Shelby County, Talladega County, Alabama. It was in force for 33 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 1, 2009, 12:57 AM CDT (05:57 UTC)
Expired: Apr 1, 2009, 1:30 AM CDT
In force: 33 min
Issued by: NWS Birmingham, AL
Area: Storm-based polygon

Counties Shelby County, AL, St. Clair County, AL, Talladega County, AL

The radar

The Birmingham radar (KBMX), 66 km from the middle of the area, began a volume at 06:00 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.

What was reported inside it

Time	Report	Where	Remark
Apr 1, 1:04 AM CDT	HAIL 0.88	Chula Vista, AL
Apr 1, 1:08 AM CDT	HAIL 0.88	3 N Pell City, AL

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 6.0 hours before the alert went out and 66 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 593 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 214 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KBMX 010557
SVRBMX
ALC115-117-121-010630-
/O.NEW.KBMX.SV.W.0084.090401T0557Z-090401T0630Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1257 AM CDT WED APR 1 2009

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN SHELBY COUNTY IN CENTRAL ALABAMA...
  SOUTHERN ST. CLAIR COUNTY IN CENTRAL ALABAMA...
  THIS INCLUDES THE CITIES OF...PELL CITY...MOODY...
  NORTH CENTRAL TALLADEGA COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 130 AM CDT

* AT 1256 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  VANDIVER...OR 6 MILES SOUTHEAST OF LEEDS...AND MOVING NORTHEAST AT
  45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BALD ROCK AND 6 MILES NORTHWEST OF COOSA ISLAND BY 105 AM CDT...
  PELL CITY BY 115 AM CDT...
  RIVERSIDE BY 120 AM CDT...
  LINCOLN BY 125 AM CDT...
  RAGLAND BY 130 AM CDT...

LAT...LON 3375 8607 3372 8612 3372 8615 3368 8615
      3368 8605 3360 8601 3336 8654 3347 8662
      3353 8655 3353 8652 3356 8652 3356 8655
      3357 8655 3381 8611
TIME...MOT...LOC 0557Z 239DEG 40KT 3349 8649

$$

27

2 follow-up statements

000 
WWUS54 KBMX 010607
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
107 AM CDT WED APR 1 2009

ALC117-010617-
/O.CAN.KBMX.SV.W.0084.000000T0000Z-090401T0630Z/
SHELBY AL-
107 AM CDT WED APR 1 2009

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SHELBY COUNTY IS
CANCELLED...

LAT...LON 3381 8611 3375 8607 3372 8612 3372 8615
      3368 8615 3368 8605 3360 8601 3360 8602
      3345 8636 3351 8638 3356 8648
TIME...MOT...LOC 0607Z 239DEG 40KT 3355 8637

$$

ALC115-121-010630-
/O.CON.KBMX.SV.W.0084.000000T0000Z-090401T0630Z/
TALLADEGA AL-ST. CLAIR AL-
107 AM CDT WED APR 1 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR SOUTHERN ST. CLAIR AND NORTH CENTRAL TALLADEGA COUNTIES...

AT 106 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR PLEASANT GROVE...OR 6 MILES WEST OF PELL CITY...MOVING
NORTHEAST AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PELL CITY...CROPWELL AND ST. CLAIR COUNTY AIRPORT BY 115 AM CDT...
  RIVERSIDE AND WATTSVILLE BY 120 AM CDT...
  LINCOLN BY 125 AM CDT...
  RAGLAND...NEELY HENRY DAM AND 7 MILES NORTHWEST OF EASTABOGA BY 130
  AM CDT...

LAT...LON 3381 8611 3375 8607 3372 8612 3372 8615
      3368 8615 3368 8605 3360 8601 3360 8602
      3345 8636 3351 8638 3356 8648
TIME...MOT...LOC 0607Z 239DEG 40KT 3355 8637

$$

27

000 
WWUS54 KBMX 010619
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
119 AM CDT WED APR 1 2009

ALC115-121-010630-
/O.CON.KBMX.SV.W.0084.000000T0000Z-090401T0630Z/
TALLADEGA AL-ST. CLAIR AL-
119 AM CDT WED APR 1 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR EAST CENTRAL ST. CLAIR AND NORTH CENTRAL TALLADEGA COUNTIES...

AT 119 AM CDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF
PRODUCING NICKEL SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. 
THIS STORM WAS LOCATED NEAR RIVERSIDE...OR NEAR PELL CITY...MOVING
NORTHEAST AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  LINCOLN BY 125 AM CDT...
  RAGLAND...NEELY HENRY DAM AND 7 MILES NORTHWEST OF EASTABOGA BY 130
  AM CDT...

LAT...LON 3381 8611 3379 8610 3375 8609 3372 8612
      3372 8615 3368 8615 3368 8605 3360 8601
      3354 8616 3368 8629
TIME...MOT...LOC 0620Z 239DEG 40KT 3362 8622

$$

27

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 Mar 31, 11:45 PM CDT, 1 hour 12 minutes earlier.

Area forecast discussion, Mar 31, 11:45 PM CDT, 1 hour 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1145 PM CDT TUE MAR 31 2009

.UPDATE...FOR 06Z AVIATION.

&&

.DISCUSSION...

SEVERAL UPPER LEVEL SYSTEMS ARE EXPECTED TO MOVE ACROSS CENTRAL
ALABAMA OVER THE NEXT 7 DAYS AS AN ACTIVE UPPER LEVEL PATTERN
REMAINS IN PLACE. A FEW OF THESE SYSTEMS COULD PRODUCE STRONG TO
SEVERE THUNDERSTORMS ON THURSDAY AND POSSIBLY SUNDAY. IN
ADDITION...HEAVY RAINFALL WILL BE POSSIBLE WITH EACH SYSTEM
INCREASING THE THREAT OF FLOODING.

A BREAK IN THE WEATHER IS ON TAP WEDNESDAY AS HIGH PRESSURE IS
BRIEFLY IN PLACE. THIS WILL BE SHORT LIVED THOUGH AS THINGS WILL
QUICKLY TRANSITION IN ANTICIPATION OF THE NEXT WEATHER SYSTEM SET
TO MOVE THROUGH ON THURSDAY. NOW...COMPUTER MODELS HAVE BEEN
FAIRLY CONSISTENT WITH THE POTENTIAL OF STRONG TO SEVERE WEATHER
ON THURSDAY. THIS THREAT IS STRICTLY OF THE SURFACE BASED
INSTABILITY AND UPPER LEVEL DYNAMICS. THERE COULD BE A FEW
INHIBITING FACTORS THAT COULD KEEP THESE STORMS IN CHECK BELOW
SEVERE LIMITS. FOR EXAMPLE...BOTH GFS AND NAM DEVELOP A GOOD
AMOUNT OF RAINFALL THURSDAY MORNING ACROSS THE CENTRAL AND
SOUTHERN PORTIONS OF THE STATE. IF THIS WERE TO OCCUR...THEN TWO
THINGS COULD HAPPEN. CENTRAL ALABAMA WOULD BE "CUT OFF" SO TO
SPEAK FROM THE SOUTHERLY FLOW WHICH WOULD PROVIDE THE MUCH NEEDED
INSTABILITY BY BRINGING IN WARM MOIST AIR. THE SECOND IS THAT IF
RAIN HANGS AROUND LONGER THAN WHAT MODELS DEPICT...THEN SURFACE
CONDITIONS WOULD REMAIN TOO COOL FOR ANYTHING SEVERE FROM
DEVELOPING. THE ECMWF IS ALSO LEANING WITH THE "CUT OFF" SOLUTION.

AFTER ASSESSING ALL THE INFORMATION...IT APPEARS THAT MODELS WANT TO
DEVELOP A SQUALL LINE THURSDAY AFTERNOON WHICH COULD AFFECT AT
LEAST THE NORTHERN HALF OF THE CWA FROM LATE AFTERNOON THROUGH THE
LATE EVENING HOURS. MAIN THREATS WILL BE STRONG STRAIGHT LINE
WINDS...HAIL...AND ISOLATED TORNADOES.

DRY CONDITIONS RETURN ON FRIDAY AND SATURDAY AS HIGH PRESSURE SETS
IN ONCE AGAIN. ANOTHER FRONT IS SET TO MOVE IN ON SUNDAY. UPPER
DYNAMICS ALSO LOOK GOOD...BUT THE QUESTION WITH THIS SYSTEM WILL
BE HOW QUICKLY MOISTURE RETURNS TO THE AREA. THERE'S STILL TIME TO
MONITOR THIS SYSTEM FOR POTENTIAL THREATS. FOR NOW...MAIN FOCUS IS
ON THURSDAY'S SYSTEM.

&&

.AVIATION...06Z TAF DISCUSSION.

LINE OF CONVECTION HAS REDEVELOPED JUST AHEAD OF AN APPROACHING
COLD FRONT. THE FRONT HAS NOW PUSHED INTO NORTHWEST ALABAMA. SOME
BRIEF HEAVY DOWNPOURS REDUCING VISIBILITIES INTO IFR WILL BE
POSSIBLE AS THE LINE PUSHES THROUGH AT ANB...MGM AND TOI. THIS
LINE OF STORMS IS EXPECTED TO HAVE CLEARED TCL...BHM AND EET BY
06Z. SOME SMALL HAIL MAY ALSO BE POSSIBLE.

CEILINGS ARE FLUCTUATING AHEAD AND ALONG THE LINE FROM IFR TO MID
RANGE MVFR. BEHIND THE FRONT...CLEARING WILL DEVELOP WITHIN A
COUPLE OF HOURS AFTER FROPA.

WINDS WILL BEGIN A SHIFT TO THE NORTHWEST AFTER FROPA AND THEN TO
THE EAST DURING THE DAY WEDNESDAY.

&&

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

&&

07/88

Hazardous weather outlook, Mar 31, 7:40 PM CDT, 5 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
740 PM CDT TUE MAR 31 2009

ALZ011>015-017>050-020100-
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-
740 PM CDT TUE MAR 31 2009

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

.DAY ONE...TONIGHT.

RIVER FLOODING CONTINUES FOR SEVERAL COUNTIES IN SOUTH AND WEST
CENTRAL ALABAMA.  PLEASE REFER TO RIVER FLOOD STATEMENTS FOR
ADDITIONAL DETAILS REGARDING YOUR AREA.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

RIVERS WILL REMAIN IN FLOOD THROUGH AT LEAST WEDNESDAY EVENING FOR
SEVERAL COUNTIES IN SOUTH AND WEST CENTRAL ALABAMA. PLEASE REFER TO
RIVER FLOOD STATEMENTS FOR ADDITIONAL DETAILS REGARDING YOUR AREA.

SEVERE THUNDERSTORMS ARE POSSIBLE ON THURSDAY AFTERNOON...LASTING
INTO THE OVERNIGHT HOURS. THE THREATS ARE ISOLATED TORNADOES...LARGE
HAIL...AND DAMAGING WINDS.

A FEW STRONG STORMS ARE POSSIBLE ON SUNDAY AFTERNOON...LASTING INTO
THE OVERNIGHT HOURS. THE MAIN THREAT IS SMALL HAIL.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT MAY BECOME
NECESSARY ON THURSDAY.

In the hours before

Special weather statement, Mar 31, 9:59 PM CDT, 2 hours 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
959 PM CDT TUE MAR 31 2009

ALZ023-030>032-034-039-010330-
BIBB-GREENE-HALE-MARENGO-SUMTER-TUSCALOOSA-
959 PM CDT TUE MAR 31 2009

...SIGNIFICANT WEATHER ALERT FOR BIBB...GREENE...HALE...MARENGO...
SUMTER AND TUSCALOOSA COUNTIES UNTIL 1030 PM CDT...

AT 955 PM CDT...THE NATIONAL WEATHER SERVICE IS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES NORTHWEST OF LOW
GAP TO 9 MILES SOUTH OF COATOPA...OR ALONG A LINE EXTENDING FROM 13
MILES SOUTHEAST OF TUSCALOOSA TO 13 MILES SOUTHEAST OF YORK...MOVING
NORTHEAST AT 30 MPH.

PEA SIZE HAIL...WINDS UP TO 40 MPH...AND FREQUENT CLOUD TO GROUND
LIGHTNING ARE EXPECTED WITH THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  BELMONT.
  SAWYERVILLE.
  COALING.
  US 80 AND AL 28.
  PHIPPS.
  PROVIDENCE.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

Local storm report, Mar 31, 10:12 PM CDT, 2 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1012 PM CDT TUE MAR 31 2009

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

0955 PM     HAIL             2 SW BELLAMY            32.44N 88.16W
03/31/2009  E0.25 INCH       SUMTER             AL   TRAINED SPOTTER

            PEA SIZED HAIL REPORTED 192 WRIGHT RD

&&

KLAWS

Local storm report, Mar 31, 10:26 PM CDT, 2 hours 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1026 PM CDT TUE MAR 31 2009

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

1005 PM     HAIL             2 NE BELLAMY            32.48N 88.11W
03/31/2009  E0.25 INCH       SUMTER             AL   BROADCAST MEDIA

            SMALL HAIL REPORTED IN COATOPA

&&

KLAWS

Special weather statement, Mar 31, 10:32 PM CDT, 2 hours 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1032 PM CDT TUE MAR 31 2009

ALZ023>025-034-010400-
BIBB-JEFFERSON-SHELBY-TUSCALOOSA-
1032 PM CDT TUE MAR 31 2009

...SIGNIFICANT WEATHER ALERT FOR BIBB...JEFFERSON...SHELBY AND
TUSCALOOSA COUNTIES UNTIL 1100 PM CDT...

AT 1029 PM CDT...THE NATIONAL WEATHER SERVICE IS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM ABERNANT TO WEST BLOCTON...
OR ALONG A LINE EXTENDING FROM 15 MILES SOUTHWEST OF HUEYTOWN TO 10
MILES NORTH OF CENTREVILLE...MOVING EAST AT 35 MPH.

ONE HALF INCH DIAMETER HAIL...WINDS UP TO 40 MPH...AND FREQUENT CLOUD
TO GROUND LIGHTNING ARE EXPECTED WITH THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  ABERNANT.
  LAKE VIEW.
  WELLER.
  NORTH JOHNS.
  UNIVERSITY OF MONTEVALLO.
  ALABAMA ADVENTURE.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

Special weather statement, Mar 31, 11:06 PM CDT, 1 hour 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1106 PM CDT TUE MAR 31 2009

ALZ023>026-034-010445-
BIBB-JEFFERSON-SHELBY-ST. CLAIR-TUSCALOOSA-
1106 PM CDT TUE MAR 31 2009

...SIGNIFICANT WEATHER ALERT FOR BIBB...JEFFERSON...SHELBY...ST.
CLAIR AND TUSCALOOSA COUNTIES UNTIL 1145 PM CDT...

AT 1107 PM CDT...THE NATIONAL WEATHER SERVICE IS TRACKING STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM ALTON TO WEST BLOCTON...OR
ALONG A LINE EXTENDING FROM LEEDS TO 11 MILES NORTH OF CENTREVILLE...
MOVING NORTHEAST AT 60 MPH.

ONE HALF INCH DIAMETER HAIL AND WINDS UP TO 40 MPH ARE EXPECTED WITH
THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  ALTON.
  TRUSSVILLE.
  CLAY.
  BRANCHVILLE.
  ST. CLAIR SPRINGS.
  CALDWELL.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

Special weather statement, Apr 1, 12:52 AM CDT, 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1252 AM CDT WED APR 1 2009

ALZ025>027-010630-
SHELBY-ST. CLAIR-TALLADEGA-
1252 AM CDT WED APR 1 2009

...SIGNIFICANT WEATHER ALERT FOR SHELBY...ST. CLAIR AND TALLADEGA
COUNTIES UNTIL 130 AM CDT...

AT 1252 AM CDT...THE NATIONAL WEATHER SERVICE IS TRACKING A STRONG
THUNDERSTORM NEAR GREYSTONE...OR 8 MILES SOUTH OF LEEDS...MOVING
NORTHEAST AT 40 MPH.

PEA SIZE HAIL AND WINDS UP TO 40 MPH ARE EXPECTED WITH THIS STORM.

* LOCATIONS IN OR NEAR THE PATH INCLUDE...
  GREYSTONE.
  VANDIVER.
  PLEASANT GROVE.
  CHULA VISTA.
  PELL CITY.
  WATTSVILLE.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 31, 11:43 PM CDT	Severe Thunderstorm Warning	BMX	Marengo	27 min
Apr 1, 1:18 AM CDT	Severe Thunderstorm Warning	BMX	Calhoun, St. Clair, Talladega	27 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2009 Every severe thunderstorm warning in 2009

Sources

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