Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 19, NWS New Orleans, LA

May 21, 1990Catahoula Parish, Concordia Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at May 21, 1990, 12:31 PM CDT for Catahoula Parish, Concordia Parish, Louisiana. It was in force for 74 min.

The area

The counties it named.

The facts

Issued
May 21, 1990, 12:31 PM CDT (17:31 UTC)
Expired
May 21, 1990, 1:45 PM CDT
In force
74 min
Issued by
NWS New Orleans, LA
Area
Whole counties

Counties Catahoula Parish, LA, Concordia Parish, LA

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, 5.5 hours before the alert went out and 178 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.

The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 21, 2:42 PM CDTSevere Thunderstorm WarningLIXTangipahoa, Washington63 min
May 21, 2:51 PM CDTSevere Thunderstorm WarningLIXEast Feliciana, West Feliciana69 min
May 21, 2:51 PM CDTSevere Thunderstorm WarningLIXSaint Helena69 min
May 21, 4:11 PM CDTSevere Thunderstorm WarningLIXSaint Bernard49 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 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.