Alert archive / Mississippi / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 117, NWS Jackson, MS

May 21, 1990Leflore County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at May 21, 1990, 7:55 AM CDT for Leflore County, Mississippi. It was in force for 50 min.

The area

The counties it named.

The facts

Issued
May 21, 1990, 7:55 AM CDT (12:55 UTC)
Expired
May 21, 1990, 8:45 AM CDT
In force
50 min
Issued by
NWS Jackson, MS
Area
Whole counties

County Leflore 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, 0.9 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-pSkew-T log-p diagram, Jackson, MS at 12:00Z on 1990-05-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2059 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, Jackson, MS at 12:00Z on 1990-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 square meters per square second.193958Sfc1 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
2059 J/kg
Mixed-layer CIN
-34 J/kg
Mixed-layer LCL
558 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.4

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, May 21, 4:28 AM CDT, 3 hours 27 minutes before
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Special weather statement, May 21, 5:03 AM CDT, 2 hours 52 minutes before
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Special weather statement, May 21, 5:26 AM CDT, 2 hours 29 minutes before
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Special weather statement, May 21, 6:01 AM CDT, 1 hour 54 minutes before
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Special weather statement, May 21, 6:32 AM CDT, 1 hour 23 minutes before
MSZALL-211200-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE JACKSON MS
625 AM CDT MON MAY 21 1990

...SEVERE THUNDERSTORM WATCH 290 IN EFFECT FOR EXTREME NORTHWEST
MISSISSIPPI UNTIL 9 AM CDT...

A LINE OF INTENSE THUNDERSTORMS WAS LOCATED FROM 25 MILES WEST OF
CORINTH, MISSISSIPPI SOUTH TO NEW ALBANY THEN SOUTHWEST TO GREENVILLE,
MISSISSIPPI.

THE STRONGER STORMS IN THIS BAND WILL BE ACCOMPANIED BY GUSTY WINDS IN
EXCESS OF 40 MILES AND HOUR...VERY HEAVY RAIN...FREQUENT CLOUD TO GROUND
LIGHTNING AND POSSIBLE HAIL. THE BAND OF THUNDERSTORMS WAS MOVING TO THE
EAST AT NEAR 45 MILES AN HOUR WEST OF CORINTH AND SOUTHEAST AT 30 BETWEEN
WATER VALLEY AND GREENVILLE.

THE STRONGER THUNDERSTORMS WERE INIDCATED 5 MILES SOUTHWEST OF SHAW.

PERSONS IN THE PATH OF THESE INTENSE STORMS SHOULD BE ALERT TO
THREATENING WEATHER AND TAKE ACTION IF NEEDED.
Special weather statement, May 21, 7:22 AM CDT, 33 minutes before
MSZALL-211300-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE JACKSON MS
725 AM CDT MON MAY 21 1990

...SEVERE THUNDERSTORM WATCH 290 IN EFFECT FOR EXTREME NORTHWEST
MISSISSIPPI UNTIL 9 AM CDT...

NUMEROUS INTENSE THUNDERSTORMS CONTINUED OVER THE NORTHERN THIRD OF
MISSISSIPPI MAINLY ALONG AND NORTH A LINE FROM HOLLANDALE TO GREENWOOD
TO NETTLETON.  THE THUNDERSTORMS EXTENDED NORTH TO TUPELO AND COAHOMA
THEN WEST INTO SOUTHEAST ARKANSAS.

THE STRONGER STORMS ARE CAPABLE OF PRODUCING GUSTY WINDS IN EXCESS OF
40 MILES AND HOUR...VERY HEAVY RAIN...FREQUENT CLOUD TO GROUND LIGHTNING
AND POSSIBLE HAIL.

THE STRONGER THUNDERSTORMS WERE INIDCATED 10 MILES NORTHWEST OF GREENBWOOD
AND ALONG THE MISSISSIPPI RIVER SOUTHWEST OF GREENVILLE.
MOVEMENT WAS NORTHEAST AT 35 MILES AN HOUR.

PERSONS IN THE PATH OF THESE INTENSE STORMS SHOULD BE ALERT TO
THREATENING WEATHER AND TAKE ACTION IF NEEDED.

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 8:21 AM CDTSevere Thunderstorm WarningJANWinston54 min
May 21, 8:29 AM CDTSevere Thunderstorm WarningJANHolmes31 min
May 21, 8:51 AM CDTSevere Thunderstorm WarningJANNoxubee54 min
May 21, 10:29 AM CDTSevere Thunderstorm WarningJANWinston46 min
May 21, 10:40 AM CDTSevere Thunderstorm WarningJANNoxubee65 min
May 21, 10:52 AM CDTSevere Thunderstorm WarningJANNeshoba68 min
May 21, 11:52 AM CDTSevere Thunderstorm WarningJANNewton53 min
May 21, 12:10 PM CDTSevere Thunderstorm WarningJANLauderdale50 min
May 21, 12:15 PM CDTSevere Thunderstorm WarningJANClaiborne45 min
May 21, 1:02 PM CDTSevere Thunderstorm WarningJANJasper43 min
May 21, 1:08 PM CDTSevere Thunderstorm WarningJANLincoln37 min
May 21, 2:19 PM CDTSevere Thunderstorm WarningJANWayne26 min
May 21, 11:26 AM CDTSevere Thunderstorm WarningJANSumter34 min
May 21, 12:52 PM CDTSevere Thunderstorm WarningJANChoctaw53 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 1990Every 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.