Alert archive / Texas / Tornado Watches in 2002
Tornado Watch 674
The Storm Prediction Center issued this tornado watch at Sep 7, 2002, 6:15 AM CDT for 17 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 7, 2002, 6:15 AM CDT (11:15 UTC)
- Expired
- Sep 7, 2002, 12:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
Counties Atascosa County, TX, Austin County, TX, Bexar County, TX, Brazoria County, TX, Colorado County, TX, DeWitt County, TX, Fort Bend County, TX, Galveston County, TX, Gonzales County, TX, Guadalupe County, TX, Harris County, TX, Jackson County, TX, Karnes County, TX, Lavaca County, TX, Liberty County, TX, Wharton County, TX, Wilson County, TX
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 11:09 AM CDT | Flash Flood Warning | EWX | Bexar | 111 min |
The nearest sounding before it
Corpus Christi, TX (KCRP), launched 00:00Z, 11.3 hours before the alert went out and 185 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
- 408 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1317 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -26 m²/s²
- 0-3 km storm-relative helicity
- -11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 071115 SEL4 SPC WW 071115 TXZ000-CWZ000-071700- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 674 STORM PREDICTION CENTER NORMAN OK 615 AM CDT SAT SEP 7 2002 THE STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTH CENTRAL AND SOUTHEAST TEXAS COASTAL WATERS EFFECTIVE THIS SATURDAY MORNING FROM 615 AM UNTIL NOON CDT. TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS ALONG AND 35 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHWEST OF SAN ANTONIO TEXAS TO 25 MILES NORTH 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 673. WATCH NUMBER 673 WILL NOT BE IN EFFECT AFTER 615 AM CDT. DISCUSSION...MESOSCALE AREA OF LOW PRESSURE IS LOCATED 50 N VCT AND IS EXPECTED TO TRACK WSWWD THROUGH THE MORNING WITH A POTENTIAL FOR A FEW TORNADOES. OTHER TORNADOES ARE ALSO POSSIBLE IN CONVECTIVE BANDS TO THE EAST OF THIS LOW...WHERE LOW LEVEL SHEAR/VORTICITY REMAINS STRONG. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 0.5 INCH...EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 08015. ...IMY 293,0990 301,0944 291,0944 283,0990
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 7:15 PM CDT | Tornado Watch | SPC | Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 9 more | 5 hr |
| Sep 6, 11:35 PM CDT | Tornado Watch | SPC | Austin, Brazoria, Chambers, Colorado, Fayette, Fort Bend and 10 more | 8 hr |
| Sep 7, 10:40 AM CDT | Tornado Watch | SPC | Austin, Brazos, Burleson, Chambers, Colorado, Fayette and 16 more | 5 hr |
Nearby
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.