Alert archive / Mississippi / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 335, NWS Jackson, MS

April 25, 1999Copiah County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Apr 25, 1999, 6:11 PM CDT for Copiah County, Mississippi. It was in force for 34 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, 6:11 PM CDT (23:11 UTC)
Expired
Apr 25, 1999, 6:45 PM CDT
In force
34 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, 11.2 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-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 1999-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 961 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, Slidell Radar S, LA at 12:00Z on 1999-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.1939Sfc1 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
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.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 24, 7:08 PM CDTSevere Thunderstorm WarningJANClarke47 min
Apr 24, 7:45 PM CDTSevere Thunderstorm WarningJANJasper50 min
Apr 24, 7:48 PM CDTSevere Thunderstorm WarningJANNewton32 min
Apr 24, 8:05 PM CDTSevere Thunderstorm WarningJANJones50 min
Apr 25, 3:39 PM CDTSevere Thunderstorm WarningJANForrest46 min
Apr 25, 4:01 PM CDTSevere Thunderstorm WarningJANCopiah64 min
Apr 25, 4:55 PM CDTSevere Thunderstorm WarningJANLamar30 min
Apr 25, 5:15 PM CDTSevere Thunderstorm WarningJANHinds35 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 1999Every 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.