Alert archive / Alabama / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 169, NWS Mobile, AL

August 30, 1990Geneva County, Houston County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 30, 1990, 12:39 PM CDT for Geneva County, Houston County, Alabama. It was in force for 66 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 30, 1990, 12:39 PM CDT (17:39 UTC)
Expired: Aug 30, 1990, 1:45 PM CDT
In force: 66 min
Issued by: NWS Mobile, AL
Area: Whole counties

Counties Geneva County, AL, Houston County, AL

The radar

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

What was reported inside it

Time	Report	Where	Remark
Aug 30, 12:40 PM CDT	Thunderstorm Wind 0	Geneva, AL

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Apalachicola Mun, FL (KAQQ), launched 12:00Z, 5.7 hours before the alert went out and 164 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: 3312 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 790 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 24 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 
TTAA00 KMGM 301744
SVRMGM
ALC061-069-301845-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MONTGOMERY AL
1239 PM CDT THU AUG 30 1990
 
THE NATIONAL WEATHER SERVICE IN MONTGOMERY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  145 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH ALABAMA
 
   ...GENEVA COUNTY...HOUSTON COUNTY
 
WEATHER RADAR AT MONTGOMERY ALABAMA SHOWED THUNDERSTORMS IN GENEVA AND
HOUSTON COUNTIES TO BE SEVERE. THE THUNDERSTORMS ARE MOVING EAST AT 10
MILES AN HOUR.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 12:49 PM CDT	Severe Thunderstorm Warning	MOB	Clarke	56 min
Aug 30, 1:44 PM CDT	Severe Thunderstorm Warning	MOB	Washington	61 min
Aug 30, 2:00 PM CDT	Severe Thunderstorm Warning	MOB	Escambia	45 min
Aug 30, 3:57 PM CDT	Severe Thunderstorm Warning	MOB	Mobile	48 min
Aug 30, 4:05 PM CDT	Severe Thunderstorm Warning	MOB	Baldwin	40 min
Aug 30, 4:06 PM CDT	Severe Thunderstorm Warning	MOB	Dale, Henry	69 min

Nearby

Severe Thunderstorm Warnings in Alabama, 1990 Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.