Alert archive / Alabama / Flash Flood Warnings in 2011
Flash Flood Warning 66, NWS Birmingham, AL
NWS Birmingham, AL issued this flash flood warning at Sep 22, 2011, 9:39 PM CDT for Jefferson County, St. Clair County, Shelby County, Alabama. It was in force for 3 hr. 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
- Sep 22, 2011, 9:39 PM CDT (02:39 UTC)
- Expired
- Sep 23, 2011, 12:30 AM CDT
- In force
- 3 hr
- Issued by
- NWS Birmingham, AL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Jefferson County, AL, Shelby County, AL, St. Clair County, AL
The radar
The Birmingham radar (KBMX), 48 km from the middle of the area, began a volume at 02:40 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 |
|---|---|---|---|
| Sep 22, 10:10 PM CDT | FLASH FLOOD | Vandiver, AL | PUBLIC REPORT OF FLOWING WATER UP TO 2 FEET DEEP IN VANDIVER AREA NEAR COUNTY ROAD 43. |
| Sep 23, 12:15 AM CDT | HEAVY RAIN 6 | Leeds, AL | RAIN AMOUNTS OF 6 INCHES WERE REPORTED NEAR LEEDS. A LANDSLIDE OCCURRED DUE TO THE HEAVY RAIN NEAR DUNNAVANT ROAD. SEVERAL LARGE ROCKS BLOCKED THE ROADWAY. |
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, 2.7 hours before the alert went out and 48 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
- 2177 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 858 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
739 WGUS54 KBMX 230239 FFWBMX ALC073-115-117-230530- /O.NEW.KBMX.FF.W.0066.110923T0239Z-110923T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE BIRMINGHAM AL 939 PM CDT THU SEP 22 2011 THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A * FLASH FLOOD WARNING FOR... EAST CENTRAL JEFFERSON COUNTY IN ALABAMA... NORTHEASTERN SHELBY COUNTY IN ALABAMA... SOUTHWESTERN ST. CLAIR COUNTY IN ALABAMA... * UNTIL 1230 AM CDT * AT 938 PM CDT...NATIONAL WEATHER SERVICE INDICATED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... IRONDALE...LEEDS...MOODY...ALTON...BALD ROCK...BARBER MOTORSPORTS PARK...BRANCHVILLE...GREYSTONE...LAKE PURDY...MEADOWBROOK AND VANDIVER. 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 3368 8642 3347 8638 3340 8670 3357 8675 $$
1 follow-up statement
744 WGUS74 KBMX 230322 FFSBMX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE BIRMINGHAM AL 1022 PM CDT THU SEP 22 2011 ALC073-115-117-230530- /O.CON.KBMX.FF.W.0066.000000T0000Z-110923T0530Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ JEFFERSON AL-ST. CLAIR AL-SHELBY AL- 1022 PM CDT THU SEP 22 2011 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHEASTERN SHELBY... SOUTHWESTERN ST. CLAIR AND EAST CENTRAL JEFFERSON COUNTIES UNTIL 1230 AM CDT... AT 1018 PM CDT...THE PUBLIC REPORTED THAT FLASH FLOODING WAS OCCURRING IN THE VANDIVER AREA AND LEEDS AREAS. SEVERAL ROADS IN THESE AREAS HAVE BEEN REPORTED COVERED WITH WATER WITH SOME VEHICLES FLOODED OUT. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS SITUATION. RAINFALL FROM PERSISTENT RAINBANDS HAS PRODUCED FLOODING IN LOW LYING AREAS AND ALONG STREETS. MANY ROADS WILL BE CLOSED DUE TO HIGH WATER AND DRIVING IS NOT RECOMMENDED DURING THE NEXT SEVERAL HOURS. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 3368 8642 3347 8638 3340 8670 3357 8675 $$
The office that day
Everything else NWS Birmingham, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 22, 8:51 PM CDT | Areal Flood Advisory | BMX | Jefferson, St. Clair, Shelby, Talladega | 114 min |
| Sep 23, 12:30 AM CDT | Areal Flood Advisory | BMX | Jefferson, St. Clair, Shelby, Talladega | 2 hr |
| Sep 23, 2:06 AM CDT | Areal Flood Advisory | BMX | Talladega | 3 hr |
| Sep 23, 2:15 AM CDT | Special Weather Statement | BMX | Talladega | 30 min |
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.