Alert archive / Louisiana / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 122, NWS Lake Charles, LA

September 21, 2001Saint Landry Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Sep 21, 2001, 5:15 PM CDT for Saint Landry 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 counties it named.

The facts

Issued: Sep 21, 2001, 5:15 PM CDT (22:15 UTC)
Expired: Sep 21, 2001, 6:15 PM CDT
In force: 60 min
Issued by: NWS Lake Charles, LA
Area: Whole counties

County Saint Landry Parish, LA

The radar

The Ft Polk radar (KPOE), 111 km from the middle of the area, began a volume at 22:18 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.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.3 hours before the alert went out and 126 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: 2390 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 749 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 22 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.

123 
WUUS54 KLCH 212215
SVRLCH
LAC097-212315-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
515 PM CDT FRI SEP 21 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ST. LANDRY PARISH IN CENTRAL LOUISIANA

* UNTIL 615 PM CDT

* AT 504 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 24 MILES NORTH OF OPELOUSAS...MOVING SOUTH AT
  15 MPH.

* THIS STORM WILL BE NEAR...
  PALMETTO BY 545 PM CDT
  WASHINGTON BY 600 PM CDT
  PORT BARRE BY 615 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.

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 Sep 21, 3:51 PM CDT, 1 hour 24 minutes earlier.

Area forecast discussion, Sep 21, 3:51 PM CDT, 1 hour 24 minutes before

SOUTHWEST LOUISIANA AND SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
240 PM CDT FRI SEP 21 2001

STALLED FNT IS DRAPED FM NRN OK AND EXTENDS ACRS CNTRL MO AND INTO
THE GREAT LAKES REGION THIS AFTN. SOUTH OF THE FRONT ELONGATED SFC
HIGH EXTENDS FM THE APPALACHIANS DOWN INTO NE LA. WHILE CLOSER TO
HOME A TROF EXTENDS FM CNTRL TX...NE TO LFK... THEN KICKS ON TO THE
EAST. DEW POINTS SOUTH OF THIS LN IN THE LWR 70S WHILE NORTH OF
THIS LN THE THEY REMAIN IN THE UPR 60S.

88-D RADAR AT LCH BECMG MORE ACTIVE THIS AFTN W/ SHWRS/TSTMS
STARTING TO MOV SOUTH AND INTO VERNON PARISH. ATMOSPHERE REMAINS
VERY UNSTABLE AND W/ MID LVL SHRTWV FM THE WEST APPROACHING THE AREA
THIS WILL ENHANCE LIFT THRU THE EVE HRS. ATTM BELIEVE THAT A FEW
STORMS WILL BECOM SEVERE THRU THE EVE HRS. MOST OF THE PRECIP WILL
END BEFORE MIDNIGHT A FEW SHWRS EXPECTED TO LINGER THRU THE OVRNGHT
HRS.

THE NW GULF WILL RMN IN THE TROPICAL AIR OVR THE WEEKEND WHEN
COMBINED W/ INSOLATION DAYTIME HEATING AND MID LVL SUPPORT THIS
WILL ENHANCE PRECIP THRU SUNDAY. PRECIP CHCS TO INCR ON SUNDAY AS
THE FIRST TO THE SEASONS COLD FRNTS DIVES SOUTH OUT OF CANADA ON
SATURDAY MRNG AND LOOKS TO APPROACH THE NW GULF SUNDAY EVE. FRNT
LOOKS TO KICK THRU THE AREA DRG THE OVRNGHT HOURS FM SUNDAY NIGHT
INTO MONDAY MORNING... W/ EXPECTED LOWS NEAR 60 ALONG THE COAST TO
THE MID 50S TWRDS AEX. AS COLDER AIR FILTERS IN WINDS IN THE 15 T0
20 MPH AND GUSTY ON MONDAY.

THE REST OF THE WEEK LOOKS TO SHAPE-UP NICELY THEREAFTER.

.PRELIM NUMBERS...
AEX 68/90/69/88/66/57/81 5536400
BPT 73/90/73/89/70/59/80 6536400
LCH 72/90/72/89/70/59/80 6536400
LFT 71/90/72/89/72/59/80 5636400

.LCH...NONE.

K. KUYPER

In the hours before

Special weather statement, Sep 21, 1:19 PM CDT, 3 hours 56 minutes before

LAZ027>033-041>045-051>055-TXZ180>182-201-215-216-212100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
119 PM CDT FRI SEP 21 2001

...A FEW SEVERE THUNDERSTORMS POSSIBLE THIS AFTERNOON...

LOCALIZED WIND GUSTS CAPABLE OF KNOCKING DOWN TREE LIMBS AND POWER
LINES...ALONG WITH LOCALIZED RAINFALL RATES OF 2 TO 3 INCHES AN HOUR
WILL BE POSSIBLE WITH A FEW OF THE THUNDERSTORMS THAT DEVELOP THIS
AFTERNOON.

THE GREATEST RISK FOR THESE THUNDERSTORMS WILL BE WEST AND SOUTH OF A
FORT POLK TO LAFAYETTE LOUISIANA LINE.

A MOIST...UNSTABLE AIRMASS AND DAYTIME HEATING WILL COMBINE TO
PRODUCE THE POSSIBILITY OF A FEW SEVERE THUNDERSTORMS.

INTERESTS SHOULD STAY TUNED TO THE LATEST WEATHER INFORMATION FROM
NOAA WEATHER RADIO OR THE LOCAL MEDIA TODAY.

22

Local storm report, Sep 21, 5:12 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES, LA
512 PM CDT FRI SEP 21 2001

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

0500 PM    2 N SIMMESPORT            LA   1.75 INCH HAIL
09/21/01   AVOYELLES                      REPORTED BY SKYWARN
                                          OBSERVER

RE

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 21, 2:09 PM CDT	Severe Thunderstorm Warning	LCH	Vernon	66 min
Sep 21, 2:53 PM CDT	Severe Thunderstorm Warning	LCH	St. Mary	22 min
Sep 21, 3:13 PM CDT	Severe Thunderstorm Warning	LCH	Rapides	62 min
Sep 21, 4:54 PM CDT	Severe Thunderstorm Warning	LCH	Iberia	66 min
Sep 21, 4:57 PM CDT	Severe Thunderstorm Warning	LCH	Avoyelles	63 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2001 Every 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; radar from the NEXRAD Level II archive.