Alert archive / Alabama / Special Weather Statements in 2011
Special Weather Statement, NWS Birmingham, AL
NWS Birmingham, AL issued this special weather statement at Aug 21, 2011, 3:26 PM CDT for Chilton County, Alabama. It was in force for 34 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
- Aug 21, 2011, 3:26 PM CDT (20:26 UTC)
- Expired
- Aug 21, 2011, 4:00 PM CDT
- In force
- 34 min
- Issued by
- NWS Birmingham, AL
County Chilton County, AL
The radar
The Birmingham radar (KBMX), 45 km from the middle of the area, began a volume at 20:30 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, 8.4 hours before the alert went out and 46 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
- 1974 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 949 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- -15 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 Aug 21, 11:30 AM CDT, 3 hours 56 minutes earlier.
Area forecast discussion, Aug 21, 11:30 AM CDT, 3 hours 56 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BIRMINGHAM AL 1130 AM CDT SUN AUG 21 2011 .UPDATE... FOR MORNING WEATHER AND AVIATION DISCUSSIONS. && .DISCUSSION... FORECAST FROM THE MID SHIFT LOOKS LIKE IT IS GREAT SHAPE...WITH ONLY MINOR ADJUSTMENTS TO THE HOURLY TEMPERATURE AND DEWPOINT GRIDS. THE SET UP REMAINS SIMILAR...AS A WEAK FRONTAL BOUNDARY AND ASSOCIATED UPPER LEVEL SHORT WAVE ARE SLOWLY DIGGING ACROSS NORTHERN MISSISSIPPI...WITH SOME AFTERNOON CONVECTION ALREADY BEGINNING TO TAKE SHAPE. WE SHOULD BEGIN TO SEE INCREASED COVERAGE OVER THE CWA WITHIN THE NEXT FEW HOURS. THE SECONDARY BOUNDARY THAT CONTAINS MUCH DRIER AIR IS STILL PARKED UP TO OUR NORTHWEST ACROSS NORTHERN MISSOURI. THIS BOUNDARY WILL BEGIN TO DIG FURTHER SOUTH OVER THE NEXT 24 TO 48 HOURS...AND IS AN IMPORTANT ONE AS IT MAY BE THE KEY PLAYER ON THE TROPICAL INFLUENCES BY MID TO LATE WEEK. && .AVIATION... 18Z TAF DISCUSSION. THERE ARE LITTLE TO NO AVIATION CONCERNS OVER THE NEXT 12 TO 18 HOURS...AS CONDITIONS ARE EXPECTED TO REMAIN VFR. HOWEVER...IF THERE ARE ANY CONCERNS THEY WILL CONTINUE TO FOCUS ON THE AFTERNOON AND EVENING CONVECTION THAT WILL BE POSSIBLE AT ANY GIVEN SITE. AS A WEAK FRONTAL BOUNDARY TRIES TO DIG SOUTH THIS AFTERNOON...FORECASTS HAVE AN INCREASED POTENTIAL FOR AFTERNOON AND EVENING CONVECTION. AT THE TIME OF ISSUANCE THE BOUNDARY IS CURRENTLY MOVING SOUTHEAST THROUGH NORTHERN MISSISSIPPI...WITH CONVECTION ALREADY BEGINNING. OTHERWISE...THERE COULD BE SOME BRIEF SHALLOW GROUND FOG DURING THE VERY EARLY MORNING HOURS DEPENDING ON THE AMOUNT OF RAIN AND OVERNIGHT CLOUD COVER. && .BMX WATCHES/WARNINGS/ADVISORIES... NONE. &&
Hazardous weather outlook, Aug 21, 9:36 AM CDT, 5 hours 50 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BIRMINGHAM AL 936 AM CDT SUN AUG 21 2011 ALZ011>015-017>050-221445- 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- 936 AM CDT SUN AUG 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COUNTIES SERVED BY THE NATIONAL WEATHER SERVICE OFFICE IN BIRMINGHAM. .DAY ONE...THIS AFTERNOON AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT IS NOT EXPECTED AT THIS TIME.
In the hours before
Special weather statement, Aug 21, 2:42 PM CDT, 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
242 PM CDT SUN AUG 21 2011
ALZ035-212030-
CHILTON AL-
242 PM CDT SUN AUG 21 2011
...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CHILTON COUNTY UNTIL 330
PM CDT...
AT 240 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING A STRONG
THUNDERSTORM NEAR CLANTON. THIS STORM WAS NEARLY STATIONARY.
WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM.
LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
VERBENA...
COOPER...
ENTERPRISE...
&&
LAT...LON 3281 8672 3290 8653 3275 8640 3271 8641
3271 8667
TIME...MOT...LOC 1942Z 330DEG 2KT 3283 8663
17/KLAWSSpecial weather statement, Aug 21, 3:26 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BIRMINGHAM AL 326 PM CDT SUN AUG 21 2011 ALZ035-212100- CHILTON AL- 326 PM CDT SUN AUG 21 2011 ...SIGNIFICANT WEATHER ADVISORY FOR EASTERN CHILTON COUNTY UNTIL 400 PM CDT... AT 325 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING A STRONG THUNDERSTORM NEAR GAP OF THE MOUNTAIN...OR NEAR CLANTON. THIS STORM WAS NEARLY STATIONARY. WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE... && LAT...LON 3281 8674 3289 8655 3271 8641 3271 8669 TIME...MOT...LOC 2026Z 165DEG 1KT 3290 8659 17/KLAWS
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 2:42 PM CDT | Special Weather Statement | BMX | Chilton | 48 min |
| Aug 21, 3:02 PM CDT | Severe Thunderstorm Warning | BMX | Chilton | 28 min |
| Aug 21, 3:37 PM CDT | Severe Thunderstorm Warning | BMX | Chilton | 23 min |
| Aug 21, 3:45 PM CDT | Special Weather Statement | BMX | Autauga | 45 min |
| Aug 21, 3:57 PM CDT | Special Weather Statement | BMX | Coosa | 48 min |
| Aug 21, 4:07 PM CDT | Severe Thunderstorm Warning | BMX | Coosa | 38 min |
| Aug 21, 4:17 PM CDT | Special Weather Statement | BMX | Randolph | 43 min |
| Aug 21, 4:48 PM CDT | Special Weather Statement | BMX | Tallapoosa | 27 min |
| Aug 21, 5:58 PM CDT | Special Weather Statement | BMX | Montgomery | 32 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.