Alert archive / Alabama / Flash Flood Warnings in 1989

Flash Flood Warning 16, NWS Birmingham, AL

August 30, 1989Calhoun County, Alabama

NWS Birmingham, AL issued this flash flood warning at Aug 30, 1989, 4:45 PM CDT for Calhoun County, Alabama. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Aug 30, 1989, 4:45 PM CDT (21:45 UTC)
Expired
Aug 30, 1989, 6:45 PM CDT
In force
2 hr
Issued by
NWS Birmingham, AL
Area
Whole counties

County Calhoun County, AL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Centreville/Bibb, AL (KCKL), launched 12:00Z, 9.8 hours before the alert went out and 160 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-pSkew-T log-p diagram, Centreville/Bibb, AL at 12:00Z on 1989-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1666 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Centreville/Bibb, AL at 12:00Z on 1989-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1666 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
791 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
10 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBHM 302148
FFWBHM
ALC015-302345-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
445 PM CDT WED AUG 30 1989
 
THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  645 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH ALABAMA
 
   ...CALHOUN COUNTY
 
THUNDERSTORMS HAVE BEEN PRODUCING VERY HEAVY RAINFALL OVER CALHOUN
COUNTY FOR THE PAST COUPLE OF HOURS AND FLASH FLOODING HAS BEEN
REPORTED IN THE CITY OF JACKSONVILLE.
 
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BrE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.

Nearby

Flash Flood Warnings in Alabama, 1989Every flash flood warning in 1989

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.