Alert archive / Alabama / Flash Flood Warnings in 2011
Flash Flood Warning 35, NWS Mobile, AL
NWS Mobile, AL issued this flash flood warning at Sep 22, 2011, 4:58 PM CDT for Choctaw County, Alabama. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Sep 22, 2011, 4:58 PM CDT (21:58 UTC)
- Expired
- Sep 22, 2011, 8:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS Mobile, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Choctaw County, AL
The radar
The Mobile radar (KMOB), 120 km from the middle of the area, began a volume at 21:59 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
Jackson, MS (KJAN), launched 12:00Z, 10.0 hours before the alert went out and 169 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
- 1142 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 822 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -10 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
299
WGUS54 KMOB 222158
FFWMOB
ALC023-230100-
/O.NEW.KMOB.FF.W.0035.110922T2158Z-110923T0100Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
458 PM CDT THU SEP 22 2011
THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHWESTERN CHOCTAW COUNTY IN SOUTHWEST ALABAMA...
* UNTIL 800 PM CDT
* AT 455 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED VERY HEAVY
RAIN FROM A SERIES OF THUNDERSTORMS MOVING NORTHEASTWARD ACROSS
SOUTHWESTERN CHOCTAW COUNTY. DOPPLER RADAR RAINFALL ESTIMATES
INDICATE THAT UP TO 3 TO 4 INCHES OF RAIN HAS FALLEN IN THE PAST
HOUR OVER THIS AREA AND ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2
INCHES ARE EXPECTED OVER THE NEXT HOUR.
* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO AQUILLA AND
CONTWELL
TO REPORT FLASH FLOODING TO YOUR NATIONAL WEATHER SERVICE...CALL TOLL
FREE AT 1 8 7 7 6 3 3 6 7 7 2.
LAT...LON 3178 8835 3170 8838 3170 8843 3170 8846
3171 8847 3176 8847 3183 8841
$$1 follow-up statement
237
WGUS74 KMOB 222320
FFSMOB
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
620 PM CDT THU SEP 22 2011
ALC023-230100-
/O.CON.KMOB.FF.W.0035.000000T0000Z-110923T0100Z/
/00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHOCTAW AL-
620 PM CDT THU SEP 22 2011
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR
SOUTHWESTERN CHOCTAW COUNTY...
AT 610 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT MOST OF THE HEAVY RAINS HAVE ENDED OVER THE AREA ALTHOUGH LIGHT
RAIN CONTINUES. DOPPLER RADAR RAINFALL ESTIMATES INDICATE THAT
AROUND FOUR INCHES OF RAIN HAS FALLEN OVER THE AREA OVER THE PAST
TWO HOURS. ALTHOUGH THE HEAVY RAINS HAVE ENDED...THE FLASH FLOOD
WARNING REMAINS IN EFFECT TO ALLOW FOR THE EXCESSIVE RAIN TO
COMPLETELY RUN OFF.
LAT...LON 3178 8835 3170 8838 3170 8843 3170 8846
3171 8847 3176 8847 3183 8841
$$The office that day
Everything else NWS Mobile, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 9:10 PM CDT | Areal Flood Advisory | MOB | Butler, Conecuh, Crenshaw, Monroe | 2 hr |
| Sep 22, 10:17 AM CDT | Special Marine Warning | MOB | 43 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.