Alert archive / Texas / Tornado Watches in 2007
Tornado Watch 253
The Storm Prediction Center issued this tornado watch at May 7, 2007, 5:59 PM CDT for 14 counties in Texas. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- May 7, 2007, 5:59 PM CDT (22:59 UTC)
- Expired
- May 8, 2007, 2:00 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
Counties Bandera County, TX, Dimmit County, TX, Edwards County, TX, Frio County, TX, Kerr County, TX, Kinney County, TX, La Salle County, TX, Maverick County, TX, Medina County, TX, Real County, TX, Uvalde County, TX, Val Verde County, TX, Webb County, TX, Zavala County, TX
The radar
The Laughlin AFB radar (KDFX), 45 km from the middle of the area, began a volume at 23:00 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
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 7, 6:06 PM CDT | Flash Flood Warning | EWX | Kinney, Maverick | 3 hr |
| May 7, 7:05 PM CDT | Flash Flood Warning | EWX | Edwards, Real | 4 hr |
| May 7, 7:57 PM CDT | Flash Flood Warning | EWX | Dimmit | 3 hr |
| May 7, 8:12 PM CDT | Flash Flood Warning | EWX | Uvalde, Zavala | 3 hr |
| May 7, 8:50 PM CDT | Severe Thunderstorm Warning | EWX | Dimmit | 25 min |
| May 7, 11:01 PM CDT | Tornado Warning | CRP | Webb | 29 min |
| May 7, 11:15 PM CDT | Flash Flood Warning | CRP | Webb | 90 min |
| May 7, 11:29 PM CDT | Severe Thunderstorm Warning | CRP | Webb | 61 min |
| May 7, 11:56 PM CDT | Severe Thunderstorm Warning | CRP | La Salle | 64 min |
| May 8, 1:00 AM CDT | Severe Thunderstorm Warning | CRP | La Salle | 30 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
Del Rio, TX (KDRT), launched 12:00Z, 11.0 hours before the alert went out and 100 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
- 3147 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 532 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 7.5
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 072300
SEL3
SPC WW 072300
TXZ000-080700-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 253
NWS STORM PREDICTION CENTER NORMAN OK
600 PM CDT MON MAY 7 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTH TEXAS
EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 600 PM UNTIL
200 AM CDT.
TORNADOES...HAIL TO 3 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 80 STATUTE
MILES EITHER SIDE OF A LINE FROM 5 MILES EAST NORTHEAST OF HONDO
TEXAS TO 50 MILES SOUTH SOUTHEAST OF DEL RIO 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.
DISCUSSION...SUPERCELLS AND SUPERCELL CLUSTERS THAT FORMED IN THE
HIGHER TERRAIN W OF THE RIO GRANDE EXPECTED TO MOVE/DEVELOP SLOWLY E
INTO 20+ KT CURRENT OF VERY MOIST ESELY LOW LEVEL FLOW. WHILE DEEP
SHEAR IS MARGINAL FOR SUPERCELL DEVELOPMENT IN LOWER TERRAIN GIVEN
CIN... STRONGLY BACK LOW LEVEL WINDS SUGGEST TORNADO POTENTIAL WITH
ANY STORMS THAT DO MOVE/DEVELOP E INTO THIS ENVIRONMENT.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 26015.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 7:04 PM CDT | Mesoscale Discussion | SPC | Crockett, Irion, Reagan, Terrell, Upton | 56 min |
| May 6, 7:55 PM CDT | Tornado Watch | SPC | Coke, Coleman, Concho, Crockett, Glasscock, Howard and 13 more | 6 hr |
| May 6, 10:20 PM CDT | Mesoscale Discussion | SPC | Concho, Irion, Reagan, Tom Green | 55 min |
| May 6, 11:04 PM CDT | Mesoscale Discussion | SPC | Archer, Clay, Cooke, Fannin, Grayson, Lamar and 3 more | 56 min |
| May 6, 11:54 PM CDT | Tornado Watch | SPC | Archer, Baylor, Clay, Wichita, Wilbarger | 5 hr |
| May 7, 4:30 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Wichita, Wilbarger | 30 min |
| May 7, 10:29 AM CDT | Mesoscale Discussion | SPC | Collin, Cooke, Denton, Fannin, Grayson, Jack and 4 more | 2 hr |
| May 7, 10:51 AM CDT | Tornado Watch | SPC | Collin, Cooke, Denton, Fannin, Grayson, Lamar and 2 more | 5 hr |
| May 7, 1:14 PM CDT | Mesoscale Discussion | SPC | Crockett, Edwards, Irion, Kimble, Kinney, Menard and 6 more | 61 min |
| May 7, 1:59 PM CDT | Mesoscale Discussion | SPC | Crockett, Edwards, Irion, Kimble, Kinney, Menard and 6 more | 61 min |
| May 7, 5:38 PM CDT | Mesoscale Discussion | SPC | Dimmit, Kinney, Maverick, Uvalde, Zavala | 67 min |
| May 7, 6:19 PM CDT | Mesoscale Discussion | SPC | Brewster, Crane, Ector, Jeff Davis, Midland, Pecos and 7 more | 86 min |
| May 7, 6:42 PM CDT | Tornado Watch | SPC | Brewster, Jeff Davis, Pecos, Presidio, Reeves, Terrell | 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; radar from the NEXRAD Level II archive.