Alert archive / Texas / Tornado Watches in 2001
Tornado Watch 834
The Storm Prediction Center issued this tornado watch at Nov 27, 2001, 8:30 PM CST for Calcasieu Parish, Cameron Parish, Louisiana; Chambers County, Galveston County, Jefferson County, Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 27, 2001, 8:30 PM CST (02:30 UTC)
- Expired
- Nov 28, 2001, 1:00 AM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
Counties Calcasieu Parish, LA, Cameron Parish, LA, Chambers County, TX, Galveston County, TX, Jefferson County, TX
The radar
The Houston radar (KHGX), 67 km from the middle of the area, began a volume at 02:29 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 00:00Z, 2.5 hours before the alert went out and 131 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
- 1018 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 497 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 199 m²/s²
- 0-3 km storm-relative helicity
- 256 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 280208 SEL4 SPC WW 280203 LAZ000-TXZ000-CWZ000-280700- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 834 STORM PREDICTION CENTER NORMAN OK 803 PM CST TUE NOV 27 2001 THE STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHWEST LOUISIANA EXTREME SOUTHEAST TEXAS AND ADJACENT COASTAL WATERS EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 830 PM UNTIL 100 AM 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 30 STATUTE MILES EITHER SIDE OF A LINE FROM 40 MILES WEST SOUTHWEST OF GALVESTON TEXAS TO 25 MILES EAST SOUTHEAST OF LAKE CHARLES LOUISIANA. 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. DISCUSSION...LINE OF SUPERCELL THUNDERSTORMS JUST OFF THE TX GULF COAST IS BEGINNING TO SHIFT SLOWLY NORTHWARD AND INLAND. MODEL GUIDANCE SUGGESTS THAT LOW LEVEL BOUNDARY WILL ALSO LIFT NORTHWARD...INCREASING THE THREAT OF SURFACE-BASED CONVECTION AND ISOLATED TORNADOES WITH STORMS. SMALL EMBEDDED BOWS COULD ALSO PRODUCE LOCALLY DAMAGING WINDS. 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 450. MEAN STORM MOTION VECTOR 24035. ...HART 293,0924 284,0951 293,0953 302,0930
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 28, 11:00 AM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Avoyelles, Beauregard, Calcasieu and 24 more | 5 hr |
| Nov 28, 2:45 PM CST | Tornado Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 24 more | 5 hr |
Nearby
Tornado Watches in Texas, 2001Tornado Watches in Louisiana, 2001Every tornado watch 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.