Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 221, NWS Jackson, MS

December 20, 1990Choctaw County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Dec 20, 1990, 5:01 PM CST for Choctaw County, Mississippi. It was in force for 44 min.

The area

The counties it named.

The facts

Issued: Dec 20, 1990, 5:01 PM CST (23:01 UTC)
Expired: Dec 20, 1990, 5:45 PM CST
In force: 44 min
Issued by: NWS Jackson, MS
Area: Whole counties

County Choctaw County, MS

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

Jackson, MS (KJAN), launched 12:00Z, 11.0 hours before the alert went out and 138 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 572 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KJAN 202302
SVRJAN
MSC019-202345-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
501 PM CST THU DEC 20 1990
 
THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  545 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN CENTRAL MISSISSIPPI
 
   ...CHOCTAW COUNTY
 
AT 503 PM CST RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES SOUTHWEST
OF ACKERMAN MISSISSIPPI M~OVING TO THE NORTHEAST AT 45 MPH.
 
 
A TORNADO WATCH IS ALSO IN EFFECT.  REMEMBER SEVERE THUNDERSTORMS
CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.  REMAIN
CALM BUT BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS.
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What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Dec 20, 4:06 PM CST, 55 minutes before

MSZ009-012-202315-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MERIDIAN MS
406 PM CST THU DEC 20 1990

LATE THIS AFTERNOON INTENSE THUNDERSTORMS STARTED DEVELOPING IN
CENTRAL MISSISSIPPI. THERE HAVE BEEN SEVERAL REPORTS OF POSSIBLE
TORNADOES.

AT 358 PM CST MERIDIAN WEATHER RADAR SHOWED AN INTENSE THUNDERSTORM IN
KEMPER COUNTY 15 MILES WEST OF DE KALB MOVING NORTHEAST AT 40 MPH.
WITH THIS MOVEMENT THE THUNDERSTORM SHOULD MOVE NEAR PREST&ON
MISSISSIPPI.

ALL IN EAST CENTRAL MISSISSIPPI SHOULD BE ALERT FOR THE THREAT OF
SEVERE WEATHER THIS AFTERNOON AND EVENING.

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 20, 2:41 PM CST	Severe Thunderstorm Warning	JAN	Yazoo	34 min
Dec 20, 2:58 PM CST	Tornado Warning	JAN	Yazoo	32 min
Dec 20, 3:09 PM CST	Tornado Warning	JAN	Madison	36 min
Dec 20, 3:47 PM CST	Tornado Warning	JAN	Copiah	28 min
Dec 20, 4:16 PM CST	Tornado Warning	JAN	Hinds, Rankin	29 min
Dec 20, 4:30 PM CST	Severe Thunderstorm Warning	JAN	Attala	30 min
Dec 20, 4:41 PM CST	Tornado Warning	JAN	Hinds	49 min
Dec 20, 4:52 PM CST	Tornado Warning	JAN	Noxubee	53 min
Dec 20, 4:58 PM CST	Tornado Warning	JAN	Rankin	24 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 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; the sounding from the Mesonet's radiosonde archive.