Alert archive / Louisiana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 99, NWS Lake Charles, LA

July 1, 2001Vernon Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Jul 1, 2001, 4:30 PM CDT for Vernon Parish, Louisiana. It was in force for 60 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Jul 1, 2001, 4:30 PM CDT (21:30 UTC)
Expired
Jul 1, 2001, 5:30 PM CDT
In force
60 min
Issued by
NWS Lake Charles, LA
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Vernon Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.5 hours before the alert went out and 107 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, Lake Charles Mun, LA at 12:00Z on 2001-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 800 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, Lake Charles Mun, LA at 12:00Z on 2001-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 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
800 J/kg
Mixed-layer CIN
-78 J/kg
Mixed-layer LCL
1198 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
21 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 
WUUS54 KLCH 012131
SVRLCH

LAC115-012230-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
430 PM CDT SUN JUL 1 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  VERNON PARISH IN WEST CENTRAL LOUISIANA

* UNTIL 530 PM CDT

* AT 425 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 12 MILES SOUTH OF FORT POLK...MOVING NORTH AT
  15 MPH.

* THIS STORM WILL BE NEAR...
  FORT POLK...PICKERING BY 445 PM CDT
  NEW LLANO BY 455 PM CDT
  LEESVILLE BY 500 PM CDT

SEVERE THUNDERSTORMS PRODUCE WINDS IN EXCESS OF 60 MPH...DESTRUCTIVE
HAIL...DEADLY LIGHTNING AND TORRENTIAL RAIN.

CALL 337-477-5285 TO REPORT SEVERE WEATHER TO THE WEATHER SERVICE.

LAT...LON 3090 9325 3089 9305 3136 9307 3136 9336

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.

NWS Lake Charles, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 1, 2:45 PM CDT, 1 hour 45 minutes earlier.

Area forecast discussion, Jul 1, 2:45 PM CDT, 1 hour 45 minutes before
SOUTHWEST LOUISIANA AND SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
245 PM CDT SUN JUL 01 2001

WATER VAPOR IMAGERY THIS AFTERNOON SHOWS UPPER LEVEL LOW OVER THE
NORTHWEST GULF DRIFTING TO THE WEST. MEANWHILE...CONVECTION
HAS FLARED UP IN THE EASTERN HALF OF THE GULF WITH SLOWLY WESTWARD
MOVING TROPICAL WAVE.

RADAR CURRENTLY HAS A GOOD COVERAGE OF SHOWERS AND THUNDERSTORMS.
CELL THIS MORNING PULSED TO SEVERE LIMITS IN JEFFERSON COUNTY AROUND
THE NEDERLAND AREA. SINCE THEN...CELLS HAVE STAYED BELOW SEVERE
LIMITS WITH HEAVY RAINFALL AND INTENSE LIGHTNING THE MAIN STORY.

FORECAST PERIOD THROUGH TUESDAY NIGHT...

UPPER LOW OVER THE NORTHWEST GULF WILL PUSH WESTWARD INTO TEXAS ON
MONDAY AND INTO SOUTHWEST TEXAS BY THE END OF THE PERIOD. AS THE
SYSTEM PUSHES WEST...WARMING IN THE MID LEVELS SHOULD TAKE PLACE
THUS LESSENING THE LIKELIHOOD FOR SEVERE STORMS.

HOWEVER...THIS WILL ALSO ALLOW TROPICAL WAVE IN EASTERN GULF TO
GRADUALLY PUSH WESTWARD TOWARDS AND ACROSS THE FORECAST AREA DURING
THE PERIOD WITH THE AXIS OF THE WAVE PASSING LATE MONDAY NIGHT INTO
TUESDAY. WITH THE WAVE WILL COME A MORE SOUTHEASTERLY WIND PATTERN
HELPING ENHANCE MOISTURE WITH PRECIPITABLE WATER VALUES NEARING 2
INCHES AND MEAN RELATIVE HUMIDITY VALUES OVER 75 PERCENT.

THEREFORE...WILL CONTINUE LIKELY POP WORDING IN ZONES FOR THE NEXT
COUPLE OF DAYS...ESPECIALLY FROM LATE MORNING TO SUNSET. HOWEVER...
NOCTURNAL ACTIVITY IN THE COASTAL WATERS AND ALONG THE COAST WILL
BE POSSIBLE AS THE WAVE APPROACHES. WITH THE DEEP TROPICAL MOISTURE
EXPECTED TO BE IN PLACE WILL MENTION THE POSSIBILITY OF HEAVY
RAINFALL IN THE ZONES.

EXTENDED...AS SYSTEM MOVES TO THE WEST OF THE AREA ON WEDNESDAY...
SHOULD SEE LESS ACTIVITY. HOWEVER...WILL KEEP A MENTION OF SHOWERS
AND THUNDERSTORMS IN THE FORECAST FOR EACH DAY.

.LCH...NONE.

.PRELIM NUMBERS...
BPT 72/88/73/87/73 26363
LCH 71/87/72/87/72 26363
LFT 71/87/71/87/72 36463
AEX 69/89/70/88/70 26262

7-RUA

In the hours before

Local storm report, Jul 1, 10:31 AM CDT, 5 hours 59 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES, LA
1031 AM CDT SUN JUL 1 2001

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1025 AM    NEDERLAND                 TX   .75 INCH HAIL
07/01/01   JEFFERSON                      STEADY DIME SIZE HAIL
                                          REPORTED BY PUBLIC

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 3:15 PM CDTSevere Thunderstorm WarningLCHCalcasieu30 min
Jul 1, 3:36 PM CDTSevere Thunderstorm WarningLCHBeauregard39 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2001Every severe thunderstorm warning in 2001

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.