Alert archive / Texas / Tornado Watches in 2007
Tornado Watch 98
The Storm Prediction Center issued this tornado watch at Mar 31, 2007, 3:17 AM CDT for 23 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 31, 2007, 3:17 AM CDT (08:17 UTC)
- Expired
- Mar 31, 2007, 10:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 23 counties
Aransas County, TX, Austin County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Harris County, TX, Jackson County, TX, Karnes County, TX, Lavaca County, TX, Liberty County, TX, Live Oak County, TX, Matagorda County, TX, Montgomery County, TX, Refugio County, TX, Victoria County, TX, Waller County, TX, Wharton County, TX
The radar
The Corpus Christi radar (KCRP), 143 km from the middle of the area, began a volume at 08:17 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
- 30%
- 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
- 30%
- One or more hailstones of 2 inches or more
- 20%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 31, 4:04 AM CDT | Severe Thunderstorm Warning | CRP | Bee | 41 min |
| Mar 31, 4:14 AM CDT | Severe Thunderstorm Warning | EWX | Lavaca | 61 min |
| Mar 31, 4:22 AM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado | 38 min |
| Mar 31, 4:30 AM CDT | Severe Thunderstorm Warning | HGX | Colorado, Jackson, Wharton | 45 min |
| Mar 31, 4:36 AM CDT | Severe Thunderstorm Warning | EWX | DeWitt | 54 min |
| Mar 31, 4:57 AM CDT | Tornado Warning | CRP | Goliad | 33 min |
| Mar 31, 4:59 AM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado | 46 min |
| Mar 31, 5:14 AM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado, Fort Bend, Wharton | 61 min |
| Mar 31, 5:26 AM CDT | Tornado Warning | HGX | Colorado, Wharton | 49 min |
| Mar 31, 5:43 AM CDT | Flash Flood Warning | CRP | Goliad | 2 hr |
| Mar 31, 5:52 AM CDT | Flash Flood Warning | EWX | Lavaca | 3 hr |
| Mar 31, 5:58 AM CDT | Flash Flood Warning | CRP | Victoria | 2 hr |
| Mar 31, 6:05 AM CDT | Tornado Warning | HGX | Fort Bend, Harris | 29 min |
| Mar 31, 6:23 AM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend, Galveston, Harris | 42 min |
| Mar 31, 7:44 AM CDT | Flash Flood Warning | CRP | Goliad | 2 hr |
| Mar 31, 7:50 AM CDT | Flash Flood Warning | CRP | Victoria | 115 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 00:00Z, 8.3 hours before the alert went out and 140 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
- 294 J/kg
- Mixed-layer CIN
- -219 J/kg
- Mixed-layer LCL
- 811 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 131 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 310815
SEL8
SPC WW 310815
TXZ000-CWZ000-311500-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 98
NWS STORM PREDICTION CENTER NORMAN OK
315 AM CDT SAT MAR 31 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST TEXAS
COASTAL WATERS
EFFECTIVE THIS SATURDAY MORNING FROM 315 AM UNTIL 1000 AM 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 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTHEAST OF BEEVILLE
TEXAS TO 30 MILES NORTH NORTHEAST OF HOUSTON TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).
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 97...
DISCUSSION...LINE OF INTENSE THUNDERSTORMS OVER CENTRAL TX IS
EXPECTED TO PERSIST THROUGH THE MORNING AND APPROACH THE MIDDLE TX
GULF COAST BY DAYBREAK. MODERATELY MOIST/UNSTABLE AIRMASS WILL POSE
A RISK OF HAIL AND DAMAGING WINDS IN STRONGER CELLS. INCREASING
SOUTHERLY LOW LEVEL JET WILL ALSO AID IN THE POTENTIAL FOR ISOLATED
TORNADOES.
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 27030.
...HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 30, 7:38 PM CDT | Mesoscale Discussion | SPC | Anderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 74 more | 2 hr |
| Mar 30, 9:48 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 49 more | 117 min |
| Mar 30, 10:06 PM CDT | Mesoscale Discussion | SPC | Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 16 more | 84 min |
| Mar 30, 10:28 PM CDT | Severe Thunderstorm Watch | SPC | Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 10 more | 8 hr |
| Mar 30, 11:53 PM CDT | Mesoscale Discussion | SPC | Anderson, Atascosa, Bandera, Bastrop, Bell, Bexar and 45 more | 67 min |
| Mar 31, 2:12 AM CDT | Mesoscale Discussion | SPC | Aransas, Atascosa, Austin, Bastrop, Bee, Brazoria and 32 more | 93 min |
| Mar 31, 2:40 AM CDT | Mesoscale Discussion | SPC | Bowie, Cass, Cherokee, Gregg, Harrison, Marion and 2 more | 95 min |
| Mar 31, 5:30 AM CDT | Mesoscale Discussion | SPC | Aransas, Austin, Bee, Brazoria, Calhoun, Chambers and 16 more | 2 hr |
| Mar 31, 7:08 AM CDT | Mesoscale Discussion | SPC | Aransas, Bee, Brazoria, Calhoun, Chambers, Fort Bend and 14 more | 67 min |
| Mar 31, 8:40 AM CDT | Severe Thunderstorm Watch | SPC | Jasper, Newton, Orange, Sabine, San Augustine | 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.