Alert archive / Texas / Tornado Watches in 2003

Tornado Watch 952

November 17, 2003Beauregard Parish, Calcasieu Parish, Vernon Parish, Louisiana; 8 counties in Texas

The Storm Prediction Center issued this tornado watch at Nov 17, 2003, 5:35 PM CST for Beauregard Parish, Calcasieu Parish, Vernon Parish, Louisiana; 8 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Nov 17, 2003, 5:35 PM CST (23:35 UTC)
Expired
Nov 18, 2003, 12:00 AM CST
In force
6 hr
Issued by
the Storm Prediction Center

Counties Beauregard Parish, LA, Calcasieu Parish, LA, Vernon Parish, LA, Chambers County, TX, Galveston County, TX, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Tyler County, TX

The radar

The Houston radar (KHGX), 74 km from the middle of the area, began a volume at 23:37 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

11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Nov 17, 5:59 PM CSTTornado WarningLCHHardin46 min
Nov 17, 6:01 PM CSTTornado WarningHGXChambers, Liberty44 min
Nov 17, 8:10 PM CSTSevere Thunderstorm WarningLCHJasper, Newton65 min
Nov 17, 8:28 PM CSTTornado WarningHGXBrazoria, Galveston32 min
Nov 17, 9:06 PM CSTTornado WarningHGXGalveston, Harris24 min
Nov 17, 9:38 PM CSTFlash Flood WarningHGXBrazoria, Galveston, Harris3 hr
Nov 17, 10:40 PM CSTTornado WarningLCHHardin65 min
Nov 17, 10:50 PM CSTFlash Flood WarningLCHHardin, Tyler4 hr
Nov 17, 11:09 PM CSTTornado WarningLCHTyler36 min
Nov 17, 11:26 PM CSTTornado WarningHGXChambers49 min
Nov 17, 11:26 PM CSTTornado WarningLCHJasper, Newton49 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.6 hours before the alert went out and 121 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 2003-11-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 413 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 2003-11-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 square meters per square second.1939587897Sfc1 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
413 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
895 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
95 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.1

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 172337
SEL2  
SPC WW 172335
LAZ000-TXZ000-CWZ000-180600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 952 
NWS STORM PREDICTION CENTER NORMAN OK 
535 PM CST MON NOV 17 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       SOUTHWEST LOUISIANA
       SOUTHEAST TEXAS
       COASTAL WATERS

EFFECTIVE THIS MONDAY AFTERNOON FROM 535 PM UNTIL MIDNIGHT CST.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 50 STATUTE MILES EAST AND WEST
OF A LINE FROM 15 MILES WEST NORTHWEST OF FORT POLK LOUISIANA TO
35 MILES SOUTH OF GALVESTON TEXAS.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 950. WATCH NUMBER 950 WILL NOT BE IN EFFECT AFTER 535
PM CST. CONTINUE...WW 949...WW 951...


DISCUSSION...MCS WITH EMBEDDED HP SUPERCELLS WILL CONTINUE TO
DEVELOP EWD FROM THE GALVESTON BAY AREA E/NEWD TOWARD SW LA THE NEXT
FEW HOURS.  BOUNDARY LAYER DEWPOINTS IN THE LOWER 70S WILL SUPPORT
MODERATE INSTABILITY AND STRONG UPDRAFTS...WHILE THE STRONGEST
LOW-LEVEL FLOW/SHEAR WILL SPREAD EWD FROM SE TX TOWARD W/SW LA
TONIGHT.  THE TORNADO THREAT WILL BE MAXIMIZED ALONG THE E/SE
PERIPHERY OF THE LARGER MCS WHERE L0W-LEVEL MOISTURE/SHEAR WILL BE
THE STRONGEST.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 22020.


...THOMPSON

310,0923 284,0935 284,0953 310,0941

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 17, 8:20 AM CSTTornado WatchSPCCalcasieu5 hr
Nov 17, 12:45 PM CSTTornado WatchSPCCalcasieu5 hr
Nov 17, 2:57 PM CSTMesoscale DiscussionSPCBossier, Caddo, De Soto, Webster2 hr
Nov 17, 5:07 PM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 14 more53 min
Nov 17, 5:25 PM CSTMesoscale DiscussionSPCBossier, Caddo, Webster65 min
Nov 16, 6:02 PM CSTMesoscale DiscussionSPCArmstrong, Briscoe, Childress, Cottle, Crosby, Dickens and 12 more118 min
Nov 17, 1:11 AM CSTMesoscale DiscussionSPCClay, Hardeman, Hemphill, Lipscomb, Montague, Wheeler and 2 more3 hr
Nov 17, 7:11 AM CSTMesoscale DiscussionSPCAnderson, Angelina, Austin, Brazos, Burleson, Cherokee and 40 more3 hr
Nov 17, 7:43 AM CSTMesoscale DiscussionSPCCooke, Fannin, Grayson, Lamar, Montague3 hr
Nov 17, 8:15 AM CSTTornado WatchSPCArcher, Clay, Collin, Cooke, Dallas, Denton and 11 more5 hr
Nov 17, 9:58 AM CSTMesoscale DiscussionSPCBandera, Bexar, Blanco, Brown, Burnet, Callahan and 36 more92 min
Nov 17, 10:21 AM CSTMesoscale DiscussionSPCBrazoria, Calhoun, Chambers, Fort Bend, Hardin, Harris and 6 more84 min
Nov 17, 10:59 AM CSTMesoscale DiscussionSPCArcher, Clay, Collin, Cooke, Dallas, Denton and 11 more91 min
Nov 17, 11:50 AM CSTMesoscale DiscussionSPCAnderson, Angelina, Aransas, Austin, Bell, Bosque and 75 more85 min
Nov 17, 12:20 PM CSTTornado WatchSPCBell, Bosque, Collin, Comanche, Cooke, Coryell and 36 more6 hr
Nov 17, 3:02 PM CSTMesoscale DiscussionSPCAustin, Brazoria, Calhoun, Chambers, Colorado, DeWitt and 16 more88 min

Nearby

Tornado Watches in Texas, 2003Tornado Watches in Louisiana, 2003Every tornado watch in 2003

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.