Alert archive / Alabama / Flash Flood Warnings in 2011
Flash Flood Warning 20, NWS Mobile, AL
NWS Mobile, AL issued this flash flood warning at Apr 20, 2011, 2:36 PM CDT for Monroe County, Alabama. It was in force for 74 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
- Apr 20, 2011, 2:36 PM CDT (19:36 UTC)
- Expired
- Apr 20, 2011, 3:50 PM CDT
- In force
- 74 min
- Issued by
- NWS Mobile, AL
- Area
- Storm-based polygon
- Flood severity
- None
County Monroe County, AL
The radar
The Mobile radar (KMOB), 120 km from the middle of the area, began a volume at 19:37 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, 7.6 hours before the alert went out and 200 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
- 2075 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 550 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 166 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 7.5
The text
As transmitted, in the capitals the NWS used until 2016.
150 WGUS54 KMOB 201936 FFWMOB ALC099-202230- /O.NEW.KMOB.FF.W.0020.110420T1936Z-110420T2230Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE MOBILE AL 236 PM CDT WED APR 20 2011 THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL MONROE COUNTY IN SOUTH CENTRAL ALABAMA... THIS INCLUDES THE CITY OF FRISCO CITY... * UNTIL 530 PM CDT * AT 233 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM NEAR FRISCO CITY...MOVING VERY SLOWLY TO THE EAST NORTHEAST AT 5 MPH. * THE THUNDERSTORM PRODUCING VERY HEAVY RAIN WILL BE NEAR... FRISCO CITY BY 300 PM CDT... EXCEL BY 340 PM CDT... ADDITIONAL RAINFALL AMOUNTS OF THREE TO FOUR INCHES OF RAINFALL ARE POSSIBLE IN THE WARNED AREA. DRIVERS AND RESIDENTS ALONG STATE ROAD 21 JUST SOUTH OF FRISCO CITY SHOULD BE ON ALERT TO POSSIBLE FLOODING. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. LAT...LON 3153 8730 3145 8725 3132 8738 3143 8754 $$ JC
1 follow-up statement
879 WGUS74 KMOB 202050 FFSMOB FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE MOBILE AL 350 PM CDT WED APR 20 2011 ALC099-202058- /O.CAN.KMOB.FF.W.0020.000000T0000Z-110420T2230Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MONROE AL- 350 PM CDT WED APR 20 2011 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTH CENTRAL MONROE COUNTY... THUNDERSTORMS HAVE DISSIPATED...ENDING THE THREAT OF FLASH FLOODING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM CDT WEDNESDAY EVENING FOR SOUTHWESTERN ALABAMA. LAT...LON 3153 8730 3145 8725 3132 8738 3143 8754 $$ 10
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.