Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 53, NWS New Orleans, LA

August 30, 1990Avoyelles Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Aug 30, 1990, 3:16 PM CDT for Avoyelles Parish, Louisiana. It was in force for 59 min.

The area

The counties it named.

The facts

Issued: Aug 30, 1990, 3:16 PM CDT (20:16 UTC)
Expired: Aug 30, 1990, 4:15 PM CDT
In force: 59 min
Issued by: NWS New Orleans, LA
Area: Whole counties

County Avoyelles 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.3 hours before the alert went out and 156 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: 1788 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 969 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 36 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBTR 302017 RRA
SVRBTR
LAC009-302115-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BATON ROUGE LA
316 PM CDT THU AUG 30 1990
 
THE NATIONAL WEATHER SERVICE IN BATON ROUGE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  415 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN EAST CENTRAL LOUISIANA
 
   ...AVOYELLES PARISH
 
NATIONAL WEATHER SERVICE RADARS SHOWED A SEVERE THUNDERSTORM 15 MILES
NORTH OF MARKSVILLE MOVING TO THE SOUTH AT 25 MPH.
 
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOO}R
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 2:28 PM CDT	Severe Thunderstorm Warning	LIX	Catahoula, Concordia	62 min
Aug 30, 4:01 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	59 min
Aug 30, 4:58 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	47 min
Aug 30, 5:46 PM CDT	Severe Thunderstorm Warning	LIX	Saint Tammany	29 min
Aug 30, 6:02 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Saint Bernard	58 min
Aug 30, 6:15 PM CDT	Severe Thunderstorm Warning	LIX	Tangipahoa	60 min
Aug 30, 6:48 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Plaquemines, Saint Bernard	57 min
Aug 30, 6:48 PM CDT	Severe Thunderstorm Warning	LIX	Saint Charles	57 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1990 Every 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.