Alert archive / Texas / Tornado Watches in 2007
Tornado Watch 203
The Storm Prediction Center issued this tornado watch at Apr 30, 2007, 3:01 PM CDT for 10 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2007, 3:01 PM CDT (20:01 UTC)
- Expired
- Apr 30, 2007, 9:48 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Dimmit County, TX, Duval County, TX, Frio County, TX, Jim Wells County, TX, La Salle County, TX, Live Oak County, TX, Maverick County, TX, McMullen County, TX, Webb County, TX, Zavala County, TX
The radar
The Laughlin AFB radar (KDFX), 171 km from the middle of the area, began a volume at 20:03 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
11 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 4:27 PM CDT | Severe Thunderstorm Warning | CRP | McMullen | 63 min |
| Apr 30, 4:46 PM CDT | Tornado Warning | CRP | McMullen | 29 min |
| Apr 30, 4:53 PM CDT | Flash Flood Warning | CRP | McMullen | 97 min |
| Apr 30, 5:13 PM CDT | Tornado Warning | CRP | Duval, McMullen | 47 min |
| Apr 30, 5:33 PM CDT | Flash Flood Warning | CRP | Duval | 87 min |
| Apr 30, 5:58 PM CDT | Tornado Warning | CRP | Duval | 62 min |
| Apr 30, 6:58 PM CDT | Tornado Warning | CRP | Duval | 62 min |
| Apr 30, 7:22 PM CDT | Severe Thunderstorm Warning | CRP | Webb | 53 min |
| Apr 30, 8:02 PM CDT | Severe Thunderstorm Warning | CRP | Duval | 32 min |
| Apr 30, 8:14 PM CDT | Tornado Warning | CRP | Webb | 46 min |
| Apr 30, 9:01 PM CDT | Severe Thunderstorm Warning | CRP | Webb | 44 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
Corpus Christi, TX (KCRP), launched 12:00Z, 8.0 hours before the alert went out and 198 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
- 2122 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 471 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 302004
SEL3
SPC WW 302004
TXZ000-010300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 203
NWS STORM PREDICTION CENTER NORMAN OK
300 PM CDT MON APR 30 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTH CENTRAL TEXAS
EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 300 PM UNTIL
1000 PM CDT.
TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 55 STATUTE
MILES EAST AND WEST OF A LINE FROM 55 MILES EAST SOUTHEAST OF
LAREDO TEXAS TO 60 MILES NORTHWEST OF COTULLA TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).
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...CONTINUE...WW 202...
DISCUSSION...TSTMS ARE EXPECTED TO BECOME INCREASINGLY NUMEROUS THIS
AFTERNOON INTO EVENING ALONG AND S OF OUTFLOW BOUNDARY STALLING
ACROSS THE AREA. OTHER STORMS DEVELOPING ALONG THE HIGHER TERRAIN
OF NERN MEXICO MAY ALSO CROSS THE INTERNATIONAL BORDER BY LATE
AFTERNOON OR EVENING. COMBINATION OF MLCAPES OF 2000-3000 J/KG AND
40-45 KT OF EFFECTIVE BULK SHEAR INDICATE THE POTENTIAL FOR
SUPERCELLS CAPABLE OF LARGE HAIL. ISOLATED TORNADOES WILL ALSO BE
POSSIBLE...ESPECIALLY WITH ANY MATURE STORMS THAT FAVORABLY INTERACT
WITH OUTFLOW BOUNDARY WHERE LOW-LEVEL SHEAR WILL BE ENHANCED.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 29020.
...MEAD/THOMPSONSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 7:25 PM CDT | Mesoscale Discussion | SPC | Brewster, Crane, Crockett, Culberson, Jeff Davis, Loving and 11 more | 65 min |
| Apr 29, 7:48 PM CDT | Tornado Watch | SPC | Bandera, Brewster, Crane, Crockett, Dimmit, Edwards and 18 more | 7 hr |
| Apr 29, 8:35 PM CDT | Mesoscale Discussion | SPC | Baylor, Callahan, Coke, Coleman, Concho, Ector and 24 more | 115 min |
| Apr 29, 10:42 PM CDT | Mesoscale Discussion | SPC | Bandera, Brewster, Crane, Crockett, Dimmit, Edwards and 18 more | 63 min |
| Apr 30, 2:10 AM CDT | Mesoscale Discussion | SPC | Bandera, Crockett, Dimmit, Edwards, Frio, Kerr and 12 more | 95 min |
| Apr 30, 2:47 AM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 10 more | 3 hr |
| Apr 30, 2:51 AM CDT | Severe Thunderstorm Watch | SPC | Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 9 more | 5 hr |
| Apr 30, 4:46 AM CDT | Mesoscale Discussion | SPC | Bandera, Blanco, Burnet, Edwards, Gillespie, Kendall and 9 more | 119 min |
| Apr 30, 12:37 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bastrop, Bee, Caldwell, DeWitt, Dimmit and 15 more | 83 min |
| Apr 30, 1:22 PM CDT | Mesoscale Discussion | SPC | Camp, Collin, Dallas, Delta, Fannin, Franklin and 14 more | 113 min |
| Apr 30, 1:26 PM CDT | Severe Thunderstorm Watch | SPC | Austin, Brazoria, Colorado, DeWitt, Fayette, Fort Bend and 10 more | 7 hr |
| Apr 30, 3:23 PM CDT | Mesoscale Discussion | SPC | Grimes, Harris, Houston, Leon, Liberty, Madison and 4 more | 97 min |
| Apr 30, 5:38 PM CDT | Mesoscale Discussion | SPC | Archer, Armstrong, Baylor, Borden, Briscoe, Callahan and 42 more | 2 hr |
| Apr 30, 6:18 PM CDT | Mesoscale Discussion | SPC | Dimmit, Duval, Frio, Jim Wells, La Salle, Live Oak and 4 more | 57 min |
| Apr 30, 6:37 PM CDT | Mesoscale Discussion | SPC | Austin, Brazoria, Colorado, DeWitt, Fayette, Fort Bend and 10 more | 83 min |
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; radar from the NEXRAD Level II archive.