Alert archive / Alabama / Flash Flood Warnings in 1990

Flash Flood Warning 44, NWS Mobile, AL

March 16, 1990Henry County, Alabama

NWS Mobile, AL issued this flash flood warning at Mar 16, 1990, 11:27 PM CST for Henry County, Alabama. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Mar 16, 1990, 11:27 PM CST (05:27 UTC)
Expired
Mar 17, 1990, 2:30 AM CST
In force
3 hr
Issued by
NWS Mobile, AL
Area
Whole counties

County Henry 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

Apalachicola Mun, FL (KAQQ), launched 00:00Z, 5.5 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.

Skew-T log-pSkew-T log-p diagram, Apalachicola Mun, FL at 00:00Z on 1990-03-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 557 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Apalachicola Mun, FL at 00:00Z on 1990-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 257 square meters per square second.1939587897117Sfc1 km3 km6 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
557 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
574 m above ground
0-6 km bulk shear
83 kt
0-1 km storm-relative helicity
257 m²/s²
0-3 km storm-relative helicity
250 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMGM 170529
FFWMGM
ALC067-170830-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MONTGOMERY AL
1127 PM CST FRI MAR 16 1990
 
THE NATIONAL WEATHER SERVICE IN MONTGOMERY HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  230 AM CST
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH ALABAMA
          ...HENRY
 
AT 1125 PM CST MONTGOMERY RADAR INDICATED MODERATE TO HEAVY RAIN
CONTINUING TO MOVE ACROSS HENRY COUNTY. THE RAIN WILL CONTINUE FOR THE
NEXT SEVERAL HOURS.
 
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 16, 6:46 PM CSTFlash Flood WarningMOBChambers, Lee, Tallapoosa119 min
Mar 16, 6:46 PM CSTFlash Flood WarningMOBCoffee, Crenshaw, Dale, Geneva, Pike119 min
Mar 16, 6:46 PM CSTFlash Flood WarningMOBBarbour119 min
Mar 16, 7:17 PM CSTSevere Thunderstorm WarningMOBBarbour, Dale, Henry58 min
Mar 16, 9:09 PM CSTFlash Flood WarningMOBCoffee, Covington, Dale, Geneva4 hr
Mar 16, 9:09 PM CSTFlash Flood WarningMOBBarbour4 hr
Mar 16, 9:38 PM CSTFlash Flood WarningMOBMacon, Montgomery2 hr
Mar 16, 9:38 PM CSTFlash Flood WarningMOBLowndes2 hr

Nearby

Flash Flood Warnings in Alabama, 1990Every flash flood warning in 1990

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.