Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 476, NWS Jackson, MS

May 23, 1999Morehouse Parish, Louisiana

NWS Jackson, MS issued this severe thunderstorm warning at May 23, 1999, 1:55 AM CDT for Morehouse Parish, Louisiana. It was in force for 35 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 23, 1999, 1:55 AM CDT (06:55 UTC)
Expired
May 23, 1999, 2:30 AM CDT
In force
35 min
Issued by
NWS Jackson, MS
Area
Whole counties

County Morehouse Parish, LA

What was reported inside it

TimeReportWhereRemark
May 23, 2:00 AM CDTHail 0.75Bonita, LA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 6.9 hours before the alert went out and 186 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, Shreveport, LA at 00:00Z on 1999-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1705 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, Shreveport, LA at 00:00Z on 1999-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 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
1705 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
1475 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
-15 m²/s²
Significant tornado parameter
-0.1
Supercell composite
-0.8

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
May 22, 7:02 PM CDTSevere Thunderstorm WarningJANHolmes33 min
May 22, 7:16 PM CDTSevere Thunderstorm WarningJANYazoo49 min
May 22, 7:44 PM CDTSevere Thunderstorm WarningJANChoctaw36 min
May 23, 3:41 AM CDTSevere Thunderstorm WarningJANMadison29 min
May 23, 4:21 AM CDTSevere Thunderstorm WarningJANMadison29 min
May 23, 12:12 PM CDTSevere Thunderstorm WarningJANForrest33 min
May 23, 6:12 PM CDTSevere Thunderstorm WarningJANHinds, Warren33 min
May 23, 6:38 PM CDTSevere Thunderstorm WarningJANMadison32 min
May 23, 6:46 PM CDTSevere Thunderstorm WarningJANHinds34 min
May 23, 6:48 PM CDTSevere Thunderstorm WarningJANRankin37 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.