Alert archive / Louisiana / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 39
The Storm Prediction Center issued this severe thunderstorm watch at Mar 25, 2002, 7:30 PM CST for 13 parishes in Louisiana; 13 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 25, 2002, 7:30 PM CST (01:30 UTC)
- Expired
- Mar 26, 2002, 1:00 AM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 26 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Angelina County, TX, Chambers County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Newton County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Tyler County, TX
The radar
The Lake Charles radar (KLCH), 71 km from the middle of the area, began a volume at 01:32 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 25, 8:16 PM CST | Severe Thunderstorm Warning | HGX | Polk | 44 min |
| Mar 25, 8:21 PM CST | Severe Thunderstorm Warning | SHV | Angelina | 39 min |
| Mar 25, 8:53 PM CST | Severe Thunderstorm Warning | LCH | Jasper, Tyler | 52 min |
| Mar 25, 9:49 PM CST | Severe Thunderstorm Warning | LCH | Rapides | 56 min |
| Mar 25, 10:24 PM CST | Severe Thunderstorm Warning | LCH | Beauregard, Vernon | 66 min |
| Mar 25, 10:27 PM CST | Severe Thunderstorm Warning | LCH | Beauregard, Vernon | 63 min |
| Mar 25, 10:39 PM CST | Severe Thunderstorm Warning | HGX | Liberty, Montgomery | 51 min |
| Mar 25, 10:53 PM CST | Severe Thunderstorm Warning | LCH | Avoyelles | 52 min |
| Mar 26, 12:09 AM CST | Severe Thunderstorm Warning | LCH | Rapides | 66 min |
| Mar 26, 12:13 AM CST | Severe Thunderstorm Warning | HGX | Harris, Liberty | 62 min |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 1.5 hours before the alert went out and 73 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
- 819 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 932 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 5.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 260132 SEL9 SPC WW 260124 LAZ000-TXZ000-CWZ000-260700- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 39 STORM PREDICTION CENTER NORMAN OK 724 PM CST MON MAR 25 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHWEST AND SOUTH CENTRAL LOUISIANA SOUTHEAST TEXAS COASTAL WATERS EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 730 PM UNTIL 100 AM CST. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 105 STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF PORT ARTHUR TEXAS TO 20 MILES NORTHWEST OF FORT POLK LOUISIANA. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. OTHER WATCH INFORMATION... CONTINUE...WW 37...WW 38... DISCUSSION...THUNDERSTORMS /INCLUDING SUPERCELLS/ EXPECTED TO INCREASE IN COVERAGE/INTENSITY DURING THE NEXT SEVERAL HOURS OVER WW AREA AS LIFT ASSOCIATED WITH 700 MB TROUGH NOW OVER FAR E TX CONTINUES EWD. INITIAL ACTIVITY LIKELY TO BE ELEVATED ABOVE FRONTAL SURFACE...BUT SURFACE-BASED STORMS POSSIBLE LATER THIS EVENING AS TROUGH MOVES ABOVE WARM SECTOR. SHALLOW BACKING OF LOW LEVEL WARM SECTOR FLOW...DUE TO LOW CENTER NEAR BRO...MAY ENHANCE LOW LEVEL ROTATIONAL POTENTIAL OF ANY PREFRONTAL STORMS. BUT LOW TO MID TROPOSPHERIC FLOW EXPECTED TO REMAIN A BIT TOO WEAK TO JUSTIFY A TORNADO WATCH ATTM. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 25035. ...CORFIDI 311,0913 292,0915 292,0952 311,0951 WWUS20 KWNS 260132 SEL9 SPC WW 260124 LAZ000-TXZ000-CWZ000-260700- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 39 STORM PREDICTION CENTER NORMAN OK 724 PM CST MON MAR 25 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHWEST AND SOUTH CENTRAL LOUISIANA SOUTHEAST TEXAS COASTAL WATERS EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 730 PM UNTIL 100 AM CST. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 105 STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF PORT ARTHUR TEXAS TO 20 MILES NORTHWEST OF FORT POLK LOUISIANA. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. OTHER WATCH INFORMATION... CONTINUE...WW 37...WW 38... DISCUSSION...THUNDERSTORMS /INCLUDING SUPERCELLS/ EXPECTED TO INCREASE IN COVERAGE/INTENSITY DURING THE NEXT SEVERAL HOURS OVER WW AREA AS LIFT ASSOCIATED WITH 700 MB TROUGH NOW OVER FAR E TX CONTINUES EWD. INITIAL ACTIVITY LIKELY TO BE ELEVATED ABOVE FRONTAL SURFACE...BUT SURFACE-BASED STORMS POSSIBLE LATER THIS EVENING AS TROUGH MOVES ABOVE WARM SECTOR. SHALLOW BACKING OF LOW LEVEL WARM SECTOR FLOW...DUE TO LOW CENTER NEAR BRO...MAY ENHANCE LOW LEVEL ROTATIONAL POTENTIAL OF ANY PREFRONTAL STORMS. BUT LOW TO MID TROPOSPHERIC FLOW EXPECTED TO REMAIN A BIT TOO WEAK TO JUSTIFY A TORNADO WATCH ATTM. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 25035. ...CORFIDI 311,0913 292,0915 292,0952 311,0951
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 25, 6:30 PM CST | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 19 more | 6 hr |
| Mar 25, 11:00 PM CST | Severe Thunderstorm Watch | SPC | Bienville, Caldwell, Catahoula, Claiborne, Concordia, De Soto and 18 more | 6 hr |
| Mar 26, 12:00 AM CST | Severe Thunderstorm Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 22 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Louisiana, 2002Severe Thunderstorm Watches in Texas, 2002Every severe thunderstorm watch in 2002
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; radar from the NEXRAD Level II archive.