Alert archive / Alabama / Flash Flood Warnings in 2011
Flash Flood Warning 36, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood warning at Jul 21, 2011, 4:30 AM CDT for Jefferson County, Alabama. It was in force for 4 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, 4:30 AM CDT (09:30 UTC)
- Expired
- Jul 21, 2011, 8:30 AM CDT
- In force
- 4 hr
- Issued by
- NWS Birmingham, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Jefferson County, AL
The radar
The Birmingham radar (KBMX), 56 km from the middle of the area, began a volume at 09:32 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, 5:17 AM CDT | FLASH FLOOD | 2 Nne Center Point, AL | A PORTION OF SWEENEY HOLLOW RD IS FLOODED AND COMPLETELY IMPASSABLE. FLOODING BEGAN AT APPROXIMATELY 517 AM. |
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 00:00Z, 9.5 hours before the alert went out and 55 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
- 642 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 994 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
015
WGUS54 KBMX 210930
FFWBMX
ALC073-211330-
/O.NEW.KBMX.FF.W.0036.110721T0930Z-110721T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
430 AM CDT THU JUL 21 2011
THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHERN JEFFERSON COUNTY IN ALABAMA...
* UNTIL 830 AM CDT
* AT 427 AM CDT...NATIONAL WEATHER SERVICE INDICATED SLOW MOVING
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
ESTIMATED AMOUNTS OF TWO TO THREE INCHES HAVE BEEN OBSERVED
BY RADAR...WITH AN ADDITIONAL ONE TO TWO INCHES EXPECTED AS
THE STORMS CONTINUE TO MOVE OVER THE SAME AREA.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
FULTONDALE...GARDENDALE...PINSON...TRUSSVILLE...ADAMSVILLE...
BROOKSIDE...CARDIFF...CENTER POINT...CLAY...GRAYSVILLE...AND
WEST JEFFERSON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. DO
NOT ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND TO
ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN
WATER BEGINS RISING.
&&
TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.
LAT...LON 3374 8654 3372 8652 3366 8652 3362 8655
3359 8688 3358 8717 3363 8713 3363 8709
3366 8709 3366 8706 3372 8703 3377 8658
3376 8655
$$
162 follow-up statements
067
WGUS74 KBMX 211049
FFSBMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
549 AM CDT THU JUL 21 2011
ALC073-211330-
/O.CON.KBMX.FF.W.0036.000000T0000Z-110721T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON AL-
549 AM CDT THU JUL 21 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN JEFFERSON
COUNTY UNTIL 830 AM CDT...
AT 544 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.
RAINFALL HAS ESTIMATED AT 2 TO 3 INCHES OVER THE PAST TWO HOURS IN
THE WARNED AREA. A REPORT OF JUST OVER 2 INCHES OF RAIN CAME FROM
THE TRUSSVILLE AREA. FLASH FLOODING WAS ALSO REPORTED NORTH OF THE
CENTER POINT AREA WITH THE ROADS IMPASSABLE.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING
INCLUDE...FULTONDALE...GARDENDALE...TRUSSVILLE...ADAMSVILLE...
BROOKSIDE...CARDIFF...CENTER POINT...CLAY...GRAYSVILLE...PINSON AND
WEST JEFFERSON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLOODING IS OBSERVED...ACT QUICKLY. DO NOT
ENTER THE WATER. TURN AROUND AND MOVE UP TO HIGHER GROUND. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
&&
LAT...LON 3374 8654 3372 8652 3366 8652 3362 8655
3359 8688 3358 8717 3363 8713 3363 8709
3366 8709 3366 8706 3372 8703 3377 8658
3376 8655
$$677
WGUS74 KBMX 211210
FFSBMX
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
710 AM CDT THU JUL 21 2011
ALC073-211330-
/O.CON.KBMX.FF.W.0036.000000T0000Z-110721T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JEFFERSON AL-
710 AM CDT THU JUL 21 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHERN JEFFERSON
COUNTY UNTIL 830 AM CDT...
AT 707 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL EAST OF THE WARNED AREA. THIS
STORM WILL SLIDE INTO THE WARNED AREA WITHIN THE NEXT HOUR.
ADDITIONALLY SCATTERED SHOWERS AND THUNDERSTORMS MAY DEVELOP AHEAD
OF THIS STORM AS WELL. RAINFALL OF 2 TO 3 INCHES HAVE FALLEN IN THE
PAST 3 HOURS ACROSS NORTHERN JEFFERSON COUNTY...WITH A FEW AREAS
RECEIVING LOCALIZED FLOODING.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH FLOODING
INCLUDE...FULTONDALE...GARDENDALE...PINSON...TRUSSVILLE...
ADAMSVILLE...BROOKSIDE...CARDIFF...CENTER POINT...CLAY...
GRAYSVILLE...AND WEST JEFFERSON.
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 3374 8654 3372 8652 3366 8652 3362 8655
3359 8688 3358 8717 3363 8713 3363 8709
3366 8709 3366 8706 3372 8703 3377 8658
3376 8655
$$The 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, 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, 8:06 AM CDT | Flash Flood Warning | BMX | Walker | 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.