Alert archive / Louisiana / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 74, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Dec 21, 1990, 2:35 PM CST for Avoyelles Parish, Louisiana. It was in force for 60 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
- Dec 21, 1990, 2:35 PM CST (20:35 UTC)
- Expired
- Dec 21, 1990, 3:35 PM CST
- In force
- 60 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Dec 21, 3:00 PM CST | Tornado F1 | Avoyelles, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 8.6 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.
- Mixed-layer CAPE
- 1489 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 546 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 247 m²/s²
- 0-3 km storm-relative helicity
- 250 m²/s²
- Significant tornado parameter
- 2.4
- Supercell composite
- 9.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Dec 21, 12:34 PM CST, 2 hours 1 minute before
LAZ006-08-09-211930- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 1230 PM CST FRI DEC 21 1990 ...TORNADO WATCH IN EFFECT UNTIL 5 PM CST FOR AVOYELLES...CATAHOULA... CONCORDIA...POINT COUPEE AND WEST FELICIANA PARISHES IN EAST CENTRAL LOUISIANA... AT 1230 PM CST RADAR SHOWED STRONG THUNDERSTORMS NEAR LAKE CHARLES TO BETWEEN SIMMESPORT AND ALEXANDRIA TO SOUTH OF TALLULAH LOUISIANA. THESE THUNDERSTORMS WERE MOVING NORTH AT 40~ MPH. RAIN SHOWERS WERE DEVELOPING FROM BATON ROUGE TO MELVILLE LOUISIANA. PEOPLE IN THE MENTIONED PARISHES SHOULD BE ALERT AS THUNDERSTORMS WILL CONTINUE TO DEVELOPE THROUGHOUT THE AFTERNOON.
Special weather statement, Dec 21, 1:31 PM CST, 1 hour 4 minutes before
LAZ006-08-09-212030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BATON ROUGE LA 130 PM CST FRI DEC 21 1990 ...TORNADO WATCH IN EFFECT UNTIL 5 PM CST FOR AVOYELLES...CATAHOULA... CONCORDIA...POINT COUPEE AND WEST FELICIANA PARISHES IN EAST CENTRAL LOUISIANA... AT 130 PM CST RADAR SHOWED THUNDERSTORMS PRODUCING SEVERE WEATHER OVER SOUTHWEST LOUISIANA FROM NORTH OF LAKE CHARLES TO SOUTH OF ALEXNDRIA. THUNDERSTORMS AND RAIN CONTINUED NEAR FERRIDAY TO MONROE LOUISIANA. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 40 MPH. PEOPLE IN THE MENTIONED PARISHES SHOULD BE ALERT AS THUNDERSTORMS CONTINUE TO DEVELOPE AND MOVE THROUGH EAST CENTRAL LOUISIANA.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 21, 2:35 PM CST | Severe Thunderstorm Warning | LIX | Catahoula | 55 min |
| Dec 21, 3:20 PM CST | Severe Thunderstorm Warning | LIX | Catahoula | 55 min |
| Dec 21, 3:56 PM CST | Severe Thunderstorm Warning | LIX | Concordia | 34 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.