Alert archive / Alabama / Flash Flood Warnings in 2011
Flash Flood Warning 38, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood warning at Jul 21, 2011, 8:06 AM CDT for Walker County, Alabama. It was in force for 3 hr. 1 report 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
- Jul 21, 2011, 8:06 AM CDT (13:06 UTC)
- Expired
- Jul 21, 2011, 11:00 AM CDT
- In force
- 3 hr
- Issued by
- NWS Birmingham, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Walker County, AL
The radar
The Birmingham radar (KBMX), 81 km from the middle of the area, began a volume at 13:07 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 |
|---|---|---|---|
| Jul 21, 8:30 AM CDT | FLASH FLOOD | Oakman, AL | SEVERAL ROADWAYS IN AND NEAR OAKMAN WERE TEMPORARILY FLOODED WITH SEVERAL INCHES OF FLOWING WATER OVER THE ROAD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Birmingham, AL (KBMX), launched 12:00Z, 1.1 hours before the alert went out and 80 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
- 493 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 661 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
910
WGUS54 KBMX 211306
FFWBMX
ALC127-211600-
/O.NEW.KBMX.FF.W.0038.110721T1306Z-110721T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
806 AM CDT THU JUL 21 2011
THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL WALKER COUNTY IN ALABAMA...
* UNTIL 1100 AM CDT
* AT 805 AM CDT...NATIONAL WEATHER SERVICE INDICATED SLOW MOVING
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
RAINFALL ESTIMATES ARE 2 TO 4 INCHES OVER THE PAST 3 HOURS WITH AN
ADDITIONAL 1 TO 2 INCHES OVER THE NEXT 3 HOURS AS ADDITIONAL
STORMS MOVE THROUGH THE AREA.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CORDOVA...JASPER...BELOIT...LYNNS PARK...OAKMAN...PARRISH...ROCKY
HOLLOW...SIPSEY AND SMITH DAM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.
LAT...LON 3392 8708 3390 8708 3390 8701 3386 8698
3386 8696 3384 8696 3380 8696 3363 8741
3366 8743 3369 8743 3369 8745 3379 8753
3397 8713
$$1 follow-up statement
678
WGUS74 KBMX 211449
FFSBMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
949 AM CDT THU JUL 21 2011
ALC127-211600-
/O.CON.KBMX.FF.W.0038.000000T0000Z-110721T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WALKER AL-
949 AM CDT THU JUL 21 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CENTRAL WALKER COUNTY
UNTIL 1100 AM CDT...
AT 948 AM CDT...ALTHOUGH MUCH OF THE HEAVY RAIN HAS DIMINISHED
ACROSS CENTRAL WALKER COUNTY...RUNOFF FROM THE PREVIOUS STORMS WILL
CONTINUE FOR AN HOUR OR SO. RADAR ESTIMATED A FEW LOCATIONS RECEIVED
2 TO 4 INCHES OF RAIN IN A SHORT PERIOD THIS MORNING.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING INCLUDE...
CORDOVA...JASPER...BELOIT...LYNNS PARK...OAKMAN...PARRISH...ROCKY
HOLLOW...SIPSEY AND SMITH DAM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.
&&
LAT...LON 3392 8708 3390 8708 3390 8701 3386 8698
3386 8696 3384 8696 3380 8696 3363 8741
3366 8743 3369 8743 3369 8745 3379 8753
3397 8713
$$
75The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 3:17 AM CDT | Areal Flood Advisory | BMX | Clay, Randolph, St. Clair, Shelby, Talladega | 118 min |
| Jul 21, 3:35 AM CDT | Flash Flood Warning | BMX | Clay, Talladega | 3 hr |
| Jul 21, 4:04 AM CDT | Areal Flood Advisory | BMX | Jefferson, St. Clair, Walker | 3 hr |
| Jul 21, 4:30 AM CDT | Flash Flood Warning | BMX | Jefferson | 4 hr |
| Jul 21, 5:19 AM CDT | Areal Flood Advisory | BMX | Calhoun, Clay, Cleburne, Randolph, Talladega | 116 min |
| Jul 21, 7:00 AM CDT | Areal Flood Advisory | BMX | Fayette, Lamar, Walker | 3 hr |
| Jul 21, 7:19 AM CDT | Flash Flood Warning | BMX | St. Clair | 3 hr |
| Jul 21, 8:46 AM CDT | Flash Flood Warning | BMX | Walker | 3 hr |
Nearby
Flash Flood Warnings in Alabama, 2011Every flash flood 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.