Alert archive / Mississippi / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 310, NWS Jackson, MS

April 14, 1999Lamar County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Apr 14, 1999, 11:41 PM CDT for Lamar 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 14, 1999, 11:41 PM CDT (04:41 UTC)
Expired
Apr 15, 1999, 12:15 AM CDT
In force
34 min
Issued by
NWS Jackson, MS
Area
Whole counties

County Lamar County, MS

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 14, 10:00 PM CDTTornado WatchSPC6 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 4.7 hours before the alert went out and 108 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 00:00Z on 1999-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 836 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 00:00Z on 1999-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 167 square meters per square second.19395878Sfc1 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
836 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
738 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
167 m²/s²
0-3 km storm-relative helicity
283 m²/s²
Significant tornado parameter
1.3
Supercell composite
6.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KJAN 150441 RRA
SVRJAN
MSC073-150515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE JACKSON MS
1141 PM CDT WED APR 14 1999

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LAMAR COUNTY IN SOUTHEASTERN MISSISSIPPI

* UNTIL 1215 AM CDT

* AT 1140 PM CDT... RADAR INDICATED A DEVELOPING SEVERE
  THUNDERSTORM 9 MILES NORTHWEST OF PURVIS... MOVING NORTHEAST AT
  50 MPH.

THIS STORM WILL MAINLY AFFECT SMALLER COMMUNITIES AND RURAL AREAS.

GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! A TORNADO
WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO
PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING.

64

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 14, 7:09 PM CDTSevere Thunderstorm WarningJANHolmes, Leflore46 min
Apr 14, 7:21 PM CDTTornado WarningJANHolmes34 min
Apr 14, 7:24 PM CDTSevere Thunderstorm WarningJANClaiborne36 min
Apr 14, 7:32 PM CDTTornado WarningJANCarroll48 min
Apr 14, 7:49 PM CDTSevere Thunderstorm WarningJANHinds31 min
Apr 14, 7:57 PM CDTTornado WarningJANHolmes33 min
Apr 14, 8:12 PM CDTSevere Thunderstorm WarningJANMontgomery33 min
Apr 14, 8:31 PM CDTSevere Thunderstorm WarningJANWebster49 min
Apr 14, 8:35 PM CDTSevere Thunderstorm WarningJANIssaquena35 min
Apr 14, 8:38 PM CDTTornado WarningJANMontgomery32 min
Apr 14, 9:04 PM CDTSevere Thunderstorm WarningJANSharkey, Washington36 min
Apr 14, 9:14 PM CDTSevere Thunderstorm WarningJANHumphreys, Sunflower31 min
Apr 14, 9:21 PM CDTSevere Thunderstorm WarningJANClay49 min
Apr 14, 9:27 PM CDTSevere Thunderstorm WarningJANIssaquena33 min
Apr 14, 9:51 PM CDTSevere Thunderstorm WarningJANRankin, Simpson49 min
Apr 14, 9:58 PM CDTSevere Thunderstorm WarningJANJefferson Davis, Marion47 min
Apr 14, 10:17 PM CDTSevere Thunderstorm WarningJANScott, Smith48 min
Apr 14, 10:19 PM CDTSevere Thunderstorm WarningJANCovington, Smith51 min
Apr 14, 10:43 PM CDTSevere Thunderstorm WarningJANJasper32 min
Apr 14, 10:45 PM CDTTornado WarningJANCovington35 min
Apr 14, 10:53 PM CDTTornado WarningJANJones32 min
Apr 14, 10:59 PM CDTTornado WarningJANJasper51 min
Apr 14, 11:26 PM CDTSevere Thunderstorm WarningJANForrest, Jones34 min
Apr 14, 11:35 PM CDTTornado WarningJANJones50 min
Apr 14, 11:40 PM CDTSevere Thunderstorm WarningJANClarke, Lauderdale50 min
Apr 14, 11:53 PM CDTTornado WarningJANForrest52 min
Apr 15, 12:23 AM CDTTornado WarningJANJones32 min
Apr 15, 12:31 AM CDTSevere Thunderstorm WarningJANKemper, Neshoba49 min
Apr 15, 12:35 AM CDTSevere Thunderstorm WarningJANClarke35 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.