Alert archive / Alabama / Flash Flood Warnings in 2001

Flash Flood Warning 10, NWS Mobile, AL

April 4, 2001Choctaw County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 4, 2001, 8:15 AM CDT for Choctaw County, Alabama. It was in force for 90 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Apr 4, 2001, 8:15 AM CDT (13:15 UTC)
Expired: Apr 4, 2001, 9:45 AM CDT
In force: 90 min
Issued by: NWS Mobile, AL
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Choctaw County, AL

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 1.3 hours before the alert went out and 170 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2317 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 598 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KMOB 041315
FFWMOB
ALC023-041445-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
815 AM CDT WED APR 4 2001

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CHOCTAW COUNTY IN SOUTHWEST ALABAMA

* UNTIL 945 AM CDT

* AT 815 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER  
  OF THUNDERSTORMS WITH HEAVY RAIN OVER NORTH CHOCTAW COUNTY.  THESE 
  STORMS WERE TRAINING ACROSS THE AREA AS THEY MOVED EAST AT 20 MPH.

* SOME CITIES LIKELY EFFECTED BY THE TRAINING STORMS WITH HEAVY RAIN 
  ARE...CROMWELL...LISMAN...JACHIN...ROBJOHN...DEAS AND CHOCTAW CITY.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN 
DEPTH BY FOOT OR BY AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT 
IMMEDIATELY AND SEEK HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
MOBILE.

LAT...LON 3230 8842 3212 8844 3210 8807 3231 8802

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 3, 7:08 PM CDT	Severe Thunderstorm Warning	MOB	Choctaw	17 min
Apr 3, 7:22 PM CDT	Severe Thunderstorm Warning	MOB	Washington	23 min
Apr 3, 9:31 PM CDT	Flash Flood Warning	MOB	Clarke, Washington	89 min
Apr 3, 9:40 PM CDT	Severe Thunderstorm Warning	MOB	Monroe	35 min
Apr 4, 6:50 AM CDT	Severe Thunderstorm Warning	MOB	Clarke, Marengo	25 min
Apr 4, 7:50 AM CDT	Flash Flood Warning	MOB	Marengo	85 min
Apr 4, 8:58 AM CDT	Severe Thunderstorm Warning	MOB	Washington	32 min
Apr 4, 9:01 AM CDT	Severe Thunderstorm Warning	MOB	Butler	19 min
Apr 4, 9:30 AM CDT	Severe Thunderstorm Warning	MOB	Washington	30 min
Apr 4, 9:45 AM CDT	Flash Flood Warning	MOB	Choctaw	90 min
Apr 4, 12:36 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	24 min

Nearby

Flash Flood Warnings in Alabama, 2001 Every flash flood warning in 2001

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.