Alert archive / Alabama / Special Weather Statements in 2011
Special Weather Statement, NWS Birmingham, AL
NWS Birmingham, AL issued this special weather statement at Apr 4, 2011, 1:57 PM CDT for Marion County, Alabama. It was in force for 48 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
- Apr 4, 2011, 1:57 PM CDT (18:57 UTC)
- Expired
- Apr 4, 2011, 2:45 PM CDT
- In force
- 48 min
- Issued by
- NWS Birmingham, AL
County Marion County, AL
The radar
The Columbus AFB radar (KGWX), 50 km from the middle of the area, began a volume at 18:57 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.
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 7.0 hours before the alert went out and 161 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.
- Mixed-layer CAPE
- 45 J/kg
- Mixed-layer CIN
- -348 J/kg
- Mixed-layer LCL
- 509 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 150 m²/s²
- 0-3 km storm-relative helicity
- 332 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at Apr 4, 1:06 PM CDT, 51 minutes earlier.
Area forecast discussion, Apr 4, 1:06 PM CDT, 51 minutes before
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</html>Hazardous weather outlook, Apr 4, 1:15 PM CDT, 42 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BIRMINGHAM AL 115 PM CDT MON APR 4 2011 ALZ011>015-017>050-051800- MARION-LAMAR-FAYETTE-WINSTON-WALKER-BLOUNT-ETOWAH-CALHOUN- CHEROKEE-CLEBURNE-PICKENS-TUSCALOOSA-JEFFERSON-SHELBY-ST. CLAIR- TALLADEGA-CLAY-RANDOLPH-SUMTER-GREENE-HALE-PERRY-BIBB-CHILTON- COOSA-TALLAPOOSA-CHAMBERS-MARENGO-DALLAS-AUTAUGA-LOWNDES-ELMORE- MONTGOMERY-MACON-BULLOCK-LEE-RUSSELL-PIKE-BARBOUR- 115 PM CDT MON APR 4 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COUNTIES SERVED BY THE NATIONAL WEATHER SERVICE OFFICE IN BIRMINGHAM. .DAY ONE...THIS AFTERNOON AND TONIGHT. A STRONG COLD FRONT WILL BRING A SIGNIFICANT SEVERE WEATHER THREAT TO ALL OF CENTRAL ALABAMA THIS AFTERNOON AND EVENING. ALL SEVERE WEATHER THREATS ARE LIKELY...INCLUDING THE THREAT FOR DAMAGING STRAIGHT LINE WINDS...LARGE HAIL...ISOLATED TORNADOES...AND BRIEF LOCALLY HEAVY RAINFALL. SUPERCELLS WITH A GREATER THREAT OF TORNADOES AND LARGE HAIL WILL BE POSSIBLE AHEAD OF THE MAIN CONVECTIVE LINE BY THE AFTERNOON... ESPECIALLY IN THE WESTERN COUNTIES OR ALONG AND WEST OF A LINE FROM JASPER. AS THE EVENT CONTINUES...FROM AROUND 2 PM THROUGH MIDNIGHT...THE CONVECTIVE SQUALL LINE IS EXPECTED TO INCREASE IN INTENSITY AND FORWARD SPEED. THE GREATEST THREAT WILL TRANSITION TO DAMAGING STRAIGHT LINE WINDS...ALTHOUGH HAIL AND A BRIEF ISOLATED TORNADO CAN NOT BE RULED OUT ALONG THE LINE. THE LINE OF THUNDERSTORMS IS EXPECTED TO EXIT CENTRAL ALABAMA AROUND OR JUST BEFORE MIDNIGHT TONIGHT. STRONG GRADIENT WINDS ARE POSSIBLE IN ADVANCE OF THE STORM SYSTEM TODAY...WITH GUSTS OF UP TO 40 MPH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY. A COLD AIR MASS BEHIND THE FRONT WILL ALLOW TEMPERATURES TO DROP DOWN INTO THE 30S ON WEDNESDAY MORNING. A FEW LOCATIONS COULD DROP DOWN TO NEAR THE FREEZING MARK IN THE COLDER VALLEY LOCATIONS. A LIGHT FROST IS POSSIBLE ACROSS MUCH OF NORTH CENTRAL ALABAMA... WHICH COULD POSE A THREAT TO TENDER VEGETATION. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT WILL BE NEEDED THIS AFTERNOON THROUGH LATE THIS EVENING FOR SEVERE WEATHER. 08/MNK
In the hours before
Special weather statement, Apr 4, 1:57 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
157 PM CDT MON APR 4 2011
ALZ011-041945-
MARION AL-
157 PM CDT MON APR 4 2011
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MARION COUNTY UNTIL
245 PM CDT...
AT 154 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING A STRONG
THUNDERSTORM 6 MILES EAST OF NEW SALEM...OR 13 MILES SOUTHEAST OF
FULTON...MOVING NORTHEAST AT 70 MPH.
HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM.
LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
WESTON...
HACKLEBURG...
SHOTSVILLE...
TESSNER...
&&
LAT...LON 3432 8770 3428 8769 3406 8815 3406 8821
3431 8818 3433 8816
TIME...MOT...LOC 1857Z 234DEG 59KT 3415 8821
08The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 4:21 AM CDT | Wind Advisory | BMX | Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more | 24 hr |
| Apr 4, 2:48 PM CDT | Special Weather Statement | BMX | Marion | 42 min |
| Apr 4, 3:05 PM CDT | Areal Flood Advisory | BMX | Marion | 115 min |
| Apr 4, 3:27 PM CDT | Special Weather Statement | BMX | Marion | 48 min |
| Apr 4, 3:54 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Lamar, Marion, Pickens | 51 min |
| Apr 4, 3:55 PM CDT | Areal Flood Advisory | BMX | Lamar | 3 hr |
| Apr 4, 4:27 PM CDT | Special Weather Statement | BMX | Marion | 48 min |
| Apr 4, 4:35 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Marion, Walker, Winston | 40 min |
| Apr 4, 4:37 PM CDT | Flash Flood Warning | BMX | Lamar | 3 hr |
| Apr 4, 4:43 PM CDT | Severe Thunderstorm Warning | BMX | Lamar, Pickens | 47 min |
| Apr 4, 4:52 PM CDT | Severe Thunderstorm Warning | BMX | Marion, Winston | 23 min |
| Apr 4, 4:53 PM CDT | Areal Flood Advisory | BMX | Winston | 112 min |
| Apr 4, 5:19 PM CDT | Areal Flood Advisory | BMX | Fayette | 116 min |
| Apr 4, 5:25 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Lamar, Pickens | 50 min |
| Apr 4, 5:27 PM CDT | Special Weather Statement | BMX | Winston | 48 min |
| Apr 4, 5:30 PM CDT | Severe Thunderstorm Warning | BMX | Walker, Winston | 45 min |
| Apr 4, 5:52 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Walker | 53 min |
| Apr 4, 5:56 PM CDT | Areal Flood Advisory | BMX | Pickens | 3 hr |
| Apr 4, 6:04 PM CDT | Areal Flood Advisory | BMX | Walker | 3 hr |
| Apr 4, 6:07 PM CDT | Severe Thunderstorm Warning | BMX | Fayette, Pickens, Tuscaloosa, Walker | 38 min |
| Apr 4, 6:16 PM CDT | Severe Thunderstorm Warning | BMX | Blount, Walker, Winston | 44 min |
| Apr 4, 6:18 PM CDT | Severe Thunderstorm Warning | BMX | Greene, Pickens, Sumter, Tuscaloosa | 57 min |
| Apr 4, 6:20 PM CDT | Severe Thunderstorm Warning | BMX | Walker, Winston | 40 min |
| Apr 4, 6:21 PM CDT | Areal Flood Advisory | BMX | Tuscaloosa | 3 hr |
| Apr 4, 6:34 PM CDT | Severe Thunderstorm Warning | BMX | Blount, Jefferson, Walker | 41 min |
| Apr 4, 6:40 PM CDT | Severe Thunderstorm Warning | BMX | Greene, Pickens, Sumter, Tuscaloosa | 50 min |
Nearby
Special Weather Statements in Alabama, 2011Every special weather statement 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.