Alert archive / Alabama / Flash Flood Warnings in 2001

Flash Flood Warning 9, NWS Mobile, AL

April 4, 2001Marengo County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 4, 2001, 7:50 AM CDT for Marengo County, Alabama. It was in force for 85 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, 7:50 AM CDT (12:50 UTC)
Expired: Apr 4, 2001, 9:15 AM CDT
In force: 85 min
Issued by: NWS Mobile, AL
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Marengo County, AL

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 0.8 hours before the alert went out and 136 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: 1424 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 545 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -2.3

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KMOB 041252
FFWMOB
ALC091-041415-

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

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 915 AM CDT

* THIS INCLUDES THE CITY OF LINDEN

* AT 750 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED A CLUSTER  
  OF THUNDERSTORMS WITH HEAVY RAIN OVER CENTRAL MARENGO COUNTY NEAR  
  LINDEN.  THESE STORMS WERE TRAINING ACROSS THE AREA AS THEY MOVED  
  EAST AT 25 MPH.

* SOME CITIES LIKELY EFFECTED BY THE TRAINING STORMS WITH HEAVY RAIN 
  ARE...LINDEN...PROVIDENCE...MAGNOLIA...THOMASTON AND DAYTON. 

EXCESSIVE RUNOFF FROM THESE STORMS 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 E2NFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
MOBILE.

LAT...LON 3243 8789 3204 8806 3204 8764 3228 8755
          3244 8755

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, 8:15 AM CDT	Flash Flood Warning	MOB	Choctaw	90 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.