Alert archive / Louisiana / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 18, NWS Lake Charles, LA

March 1, 1991Acadia Parish, Evangeline Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Mar 1, 1991, 7:00 AM CST for Acadia Parish, Evangeline 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: Mar 1, 1991, 7:00 AM CST (13:00 UTC)
Expired: Mar 1, 1991, 8:00 AM CST
In force: 60 min
Issued by: NWS Lake Charles, LA
Area: Whole counties

Counties Acadia Parish, LA, Evangeline Parish, LA

What was reported inside it

Time	Report	Where	Remark
Mar 1, 7:40 AM CST	Thunderstorm Wind 0	Acadia, 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 1.0 hours before the alert went out and 261 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: 60 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 582 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 409 m²/s²
Significant tornado parameter: 0.0
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.

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, Mar 1, 1:49 AM CST, 5 hours 11 minutes before

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Special weather statement, Mar 1, 1:51 AM CST, 5 hours 9 minutes before

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Special weather statement, Mar 1, 3:25 AM CST, 3 hours 35 minutes before

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Special weather statement, Mar 1, 4:38 AM CST, 2 hours 22 minutes before

LAZ005-006-007-008-011-012-011145-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE LAKE CHARLES LA
425 AM CST FRI MAR 1 1991

...A TORNADO WATCH IS IN EFFECT FOR CENTRAL AND SOUTHWEST LOUISIANA
   UNTIL 10 AM THIS MORNING...

AT 425 AM...THUNDERSTORMS WITH VERY HEAVY RAIN WERE OVER SOUTHERN RAPIDES
PARISH...AND OVER THE GULF 30 MILES SOUTHWEST OF PECAN ISLAND AND 25 MILES
EAST OF GALVESTON.   THESE THUNDERSTORMS WERE PART OF A LARGER AREA OF
THUNDERSTORMS AND RAIN THAT COVERED MUCH CENTRAL AND SOUTHWEST LOUISIANA
AND THE COASTAL AREA OF THE UPPER TEXAS COAST.   THIS AREA EXTENDED OVER
THE GULF TO OVER 125 MILES BETWEEN FREEPORT TEXAS AND ATCHAFALAYA BAY.

MOVEMENT WAS NORTHEAST AT 35 MILES AN HOUR.

Special weather statement, Mar 1, 5:46 AM CST, 1 hour 14 minutes before

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The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 1, 2:07 AM CST	Severe Thunderstorm Warning	LCH	Beauregard, Vernon	68 min
Mar 1, 5:50 AM CST	Severe Thunderstorm Warning	LCH	Cameron	40 min
Mar 1, 6:30 AM CST	Severe Thunderstorm Warning	LCH	Jefferson Davis	45 min
Mar 1, 8:07 AM CST	Severe Thunderstorm Warning	LCH	Cameron	53 min
Mar 1, 8:11 AM CST	Severe Thunderstorm Warning	LCH	Beauregard, Calcasieu	49 min
Mar 1, 8:48 AM CST	Severe Thunderstorm Warning	LCH	Jefferson, Orange	57 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 1991 Every severe thunderstorm warning in 1991

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.