Alert archive / Mississippi / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 332, NWS Jackson, MS

April 25, 1999Copiah County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Apr 25, 1999, 4:01 PM CDT for Copiah County, Mississippi. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 25, 1999, 4:01 PM CDT (21:01 UTC)
Expired: Apr 25, 1999, 5:05 PM CDT
In force: 64 min
Issued by: NWS Jackson, MS
Area: Whole counties

County Copiah County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.0 hours before the alert went out and 194 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: 961 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 814 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: -48 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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, Apr 25, 10:25 AM CDT, 5 hours 36 minutes before

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025>066-072>074-
260400-

AREA THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE JACKSON MS
1025 AM CDT SUN APR 24 1999

VERY MOIST AND UNSTABLE AIR WILL REMAIN OVER THE LOWER MISSISSIPPI RIVER
VALLEY THROUGH MONDAY. A FRONTAL BOUNDARY...STRETCHING EAST-WEST ACROSS
SOUTHERN ARKANSAS AND NORTHERN MISSISSIPPI...WILL DRIFT NORTH AS A WARM
FRONT TODAY. AN UPPER-LEVEL LOW PRESSURE SYSTEM...WITH ITS ASSOCIATED
SURFACE COLD FRONT...WILL SHIFT EAST ACROSS THE SOUTHERN PLAINS THROUGH
MONDAY.

AIDED BY DIURNAL HEATING...SHOWERS AND THUNDERSTORMS WILL DEVELOP IN THE
UNSTABLE AIRMASS OVER THE LOWER MISSISSIPPI RIVER VALLEY. SMALL HAIL...
GUSTY WINDS...FREQUENT LIGHTNING...AND BRIEF HEAVY RAIN MAY OCCUR IN ANY
STRONGER STORMS. HOWEVER...NO WIDESPREAD SEVERE WEATHER IS EXPECTED
THROUGH TONIGHT.

ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS AND CIVIL DEFENSE/
SHOULD NOT BE REQUIRED THROUGH TONIGHTv. HOWEVER...EMERGENCY MANAGEMENT
PERSONNEL AND SPOTTERS SHOULD BE ALERT FOR ANY RAPIDLY CHANGING OR
THREATENING WEATHER CONDITIONS.

FOR MORE INFORMATION...PLEASE VISIT OUR WORLD WIDE WEBSITE ON THE
INTERNET AT - HTTP://WWW.JANNWS.STATE.MS.US

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 7:08 PM CDT	Severe Thunderstorm Warning	JAN	Clarke	47 min
Apr 24, 7:45 PM CDT	Severe Thunderstorm Warning	JAN	Jasper	50 min
Apr 24, 7:48 PM CDT	Severe Thunderstorm Warning	JAN	Newton	32 min
Apr 24, 8:05 PM CDT	Severe Thunderstorm Warning	JAN	Jones	50 min
Apr 25, 3:39 PM CDT	Severe Thunderstorm Warning	JAN	Forrest	46 min
Apr 25, 4:55 PM CDT	Severe Thunderstorm Warning	JAN	Lamar	30 min
Apr 25, 5:15 PM CDT	Severe Thunderstorm Warning	JAN	Hinds	35 min
Apr 25, 6:11 PM CDT	Severe Thunderstorm Warning	JAN	Copiah	34 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 1999 Every severe thunderstorm warning in 1999

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.