Alert archive / Alabama / Flash Flood Warnings in 2001

Flash Flood Warning 18, NWS Mobile, AL

August 12, 2001Mobile County, Alabama

NWS Mobile, AL issued this flash flood warning at Aug 12, 2001, 11:21 AM CDT for Mobile County, Alabama. It was in force for 84 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: Aug 12, 2001, 11:21 AM CDT (16:21 UTC)
Expired: Aug 12, 2001, 12:45 PM CDT
In force: 84 min
Issued by: NWS Mobile, AL
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Mobile County, AL

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.4 hours before the alert went out and 147 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: 2798 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 560 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KMOB 121627
FFWMOB
ALC097-121745-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1121 AM CDT SUN AUG 12 2001

THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A

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

* UNTIL 1245 PM CDT

* AT 1115 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED           
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER MOBILE AIRPORT...OR   
  ABOUT 11 MILES WEST OF DOWNTOWN MOBILE...MOVING EAST AT 15 MPH.

* THE THUNDERSTORMS WITH EXCESSIVE RAINFALL WILL BE NEAR...
  AIRPORT AND UNIVERSITY...CHUNCHULA BY 1125 AM CDT
  SPRING HILL COLLEGE...LANGAN PARK BY 1130 AM CDT
  I65 AND MOFFETT ROAD...I65 AND AIRPORT BLVD BY 1135 AM CDT
  CRICHTON...AIRPORT AND GOVERNMENT BY 1140 AM CDT

THESE THUNDERSTORMS PRODUCED OVER THREE QUARTERS OF AN INCH OF 
RAINFALL AT THE NATIONAL WEATHER SERVICE OFFICE IN A 20 MINUTE 
PERIOD STARTING AT 1100 AM.  RAINFALL AT THIS RATE WILL PRODUCE 
HOURLY TOTALS OF AROUND 2 INCHES.  THE GROUND AROUND THE MOBILE AREA 
IS SATURATED FROM THE 2 TO 4 INCHES OF RAINFALL THAT FELL ACROSS THE 
AREA YESTERDAY.  AS A RESULT...THE CURRENT HEAVY RAINS WILL LIKELY 
CAUSE FLASH FLOODING.  

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 
OUTSIDE OF THE CITY OF MOBILE...AND OTHER LOW LYING AREAS ARE 
SUBJECT TO FLASH 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. 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 3093 8840 3040 8840 3045 8814 3095 8804

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.