Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 12, NWS Lake Charles, LA

February 28, 2001Jefferson County, Texas

NWS Lake Charles, LA issued this severe thunderstorm warning at Feb 28, 2001, 6:41 AM CST for Jefferson County, Texas. It was in force for 64 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
Feb 28, 2001, 6:41 AM CST (12:41 UTC)
Expired
Feb 28, 2001, 7:45 AM CST
In force
64 min
Issued by
NWS Lake Charles, LA
Area
Whole counties

County Jefferson County, TX

The radar

The Lake Charles radar (KLCH), 95 km from the middle of the area, began a volume at 12:41 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, 0.7 hours before the alert went out and 96 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 2001-02-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1563 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 2001-02-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.193958Sfc1 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
1563 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
440 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KLCH 281242
SVRLCH
TXC245-281345-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
641 AM CST WED FEB 28 2001

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JEFFERSON COUNTY IN SOUTHEAST TEXAS

* UNTIL 745 AM CST

* AT 636 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 21 MILES WEST OF NEDERLAND...MOVING EAST AT 25
  MPH.

* THIS STORM WILL BE NEAR...
  NEDERLAND BY 720 AM CST
  PORT NECHES BY 725 AM CST
  GROVES BY 730 AM CST
  PORT ARTHUR BY 740 AM CST 

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

THIS THUNDERSTORM IS CAPABLE OF PRODUCING VERY LARGE HAIL WHICH COULD
CAUSE SIGNIFICANT DAMAGE TO PROPERTY.

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 Feb 28, 3:00 AM CST, 3 hours 41 minutes earlier.

Area forecast discussion, Feb 28, 3:00 AM CST, 3 hours 41 minutes before
SOUTHEAST TEXAS AND SOUTHWEST LOUISIANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
300 AM CST WED FEB 28 2001

A COLD FRONT IS SLOWLY MOVING SOUTHEAST JUST OVER THE CENTRAL PORTION OF
LOUISIANA THIS MORNING CAUSING A MAJORITY OF THE SHOWERS AND
THUNDERSTORMS JUST NORTH OF THE CWA. THE FRONT SHOULD SLOWLY SAG
SOUTH CAUSING SHOWERS AND THUNDERSTORMS TO INCREASE THE NEXT COUPLE
OF DAYS.  DENSE FOG HAS FORMED AND IS PRETTY MUCH SOUTH OF THE COLD
FRONT WHICH IS IN THE NORTHERN PORTION OF THE CWA...THEREFORE WILL
CONTINUE THE DENSE FOG ADVISORY BUT FOR ONLY THE SOUTHERN TWO-THIRDS
OF THE CWA UNTIL MID MORNING.  THE LCH SOUNDING LAST NIGHT INDICATED
A PWAT OF 1.34 AND A K-INDEX OF 23...WHICH INDICATES THE AIRMASS IS
BECOMING MORE MOIST AND UNSTABLE.  THE LIFTED INDEX IS A -2.2 WITH A
CAPE OF 1865 J/KG INDICATING THE AIRMASS IS UNSTABLE BUT NOT AT A
POINT OF WIDESPREAD SEVERE WEATHER.  ISOLATED INCIDENCE OF SEVERE
WEATHER COULD DEVELOP LATER TODAY.  TEMPERATURES WILL CONTINUE TO BE
NEAR NORMAL TO SLIGHTLY ABOVE WITH A CONSIDERABLE AMOUNT OF
CLOUDINESS EXPECTED.  THE FRONT SHOULD SAG FAR ENOUGH SOUTH ON
THURSDAY TO INCREASE THE CHANCE FOR SHOWERS EVEN MORE.  WINDS WILL
BE GENERALLY LIGHT WITH THE FRONT IN THE VICINITY OF SOUTH
LOUISIANA.

MARINE...BOY035 SHOWED A WIND FROM THE EAST AT 6 KNOTS WITH 2 FOOT
SEAS.  VERY LITTLE CHANGE IN THE WIND AND SEAS FOR THE NEXT FEW
DAYS. A STRONG COLD FRONT WILL MOVE THROUGH THE AREA ON SATURDAY
CAUSING POSSIBLE SMALL CRAFT ADVISORY WINDS IN ITS WAKE.

LONG TERM...MOISTURE WILL EVEN BE MORE FRIDAY AND SATURDAY AHEAD OF A
STRONG COLD FRONT THAT WILL TRACK THROUGH THE AREA ON SATURDAY.  A
GOOD POSSIBILITY OF SEVERE WEATHER AS THE POLAR AND SUB-TROPICAL JET
BOTH CONVERGE OVER THE AREA DURING THE WEEKEND. A CONSIDERABLE
AMOUNT OF DRYING WILL TAKE PLACE BY LATE IN THE WEEKEND CAUSING
SHOWERS AND THUNDERSTORMS TO END AT THAT TIME.

.LCH...DENSE FOG ADVISORY LAZ030>033-041>045-051>055-
...                       TXZ201-215-216

.ADJUSTED NUMBERS...
AEX 65/49/60/50/64 7677
BPT 70/55/65/55/67 6677
LCH 71/55/66/55/68 6677
LFT 71/55/6G6/55/68 6677

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 28, 5:50 AM CSTSevere Thunderstorm WarningLCHHardin, Jefferson55 min

Nearby

Severe Thunderstorm Warnings in Texas, 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; radar from the NEXRAD Level II archive.