Alert archive / Alabama / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 170, NWS Mobile, AL

August 30, 1990Clarke County, Alabama

NWS Mobile, AL issued this severe thunderstorm warning at Aug 30, 1990, 12:49 PM CDT for Clarke County, Alabama. It was in force for 56 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, 12:49 PM CDT (17:49 UTC)
Expired: Aug 30, 1990, 1:45 PM CDT
In force: 56 min
Issued by: NWS Mobile, AL
Area: Whole counties

County Clarke 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, 1:05 PM CDT	Hail 0.75	Clarke, 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

Centreville/Bibb, AL (KCKL), launched 12:00Z, 5.8 hours before the alert went out and 148 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: 2253 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 1256 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -28 m²/s²
0-3 km storm-relative helicity: 13 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 KMOB 301750
SVRMOB
ALC025-301845-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOBILE AL
1249 PM CDT THU AUG 30 1990
 
THE NATIONAL WEATHER SERVICE IN MOBILE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  145 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTHWEST ALABAMA
 
   ...CLARKE COUNTY
 
AT 1245 PM CDT MOBILE RADAR INDICATED A SEVERE THUNDERSTORM BETWEEN
COFFEEVILLE AND GROVE HILL. THE THUNDERSTORM IS LIKELY PRODUCING HAIL
AND STRONG GUSTY WINDS.
 
THE THUNDERSTORM IS MOVING SOUTHEAST AT 10 MPH AND SHOULD MOVE INTO
THE GROVE HILL AREA IN THE NEXT 1/2 HOUR.
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 12:39 PM CDT	Severe Thunderstorm Warning	MOB	Geneva, Houston	66 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.