Alert archive / Texas / Tornado Watches in 2008
Tornado Watch 297
The Storm Prediction Center issued this tornado watch at May 10, 2008, 4:16 PM CDT for 26 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 10, 2008, 4:16 PM CDT (21:16 UTC)
- Expired
- May 10, 2008, 8:55 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 3 in
- Strongest gust expected
- 60 kt
All 26 counties
Anderson County, TX, Bell County, TX, Bosque County, TX, Collin County, TX, Coryell County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Freestone County, TX, Henderson County, TX, Hill County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Tarrant County, TX, Van Zandt County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 51 km from the middle of the area, began a volume at 21:18 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
- 50%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 5:52 PM CDT | Severe Thunderstorm Warning | FWD | Dallas | 29 min |
| May 10, 7:57 PM CDT | Severe Thunderstorm Warning | FWD | Delta, Hunt | 63 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
Shreveport, LA (KSHV), launched 12:00Z, 9.3 hours before the alert went out and 288 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
- 1370 J/kg
- Mixed-layer CIN
- -177 J/kg
- Mixed-layer LCL
- 917 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 211 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 9, 8:14 PM CDT | Mesoscale Discussion | SPC | Bell, Burnet, Coryell, Falls, Lampasas, Limestone and 5 more | 61 min |
| May 10, 4:05 AM CDT | Mesoscale Discussion | SPC | Red River, Titus | 115 min |
| May 10, 12:47 PM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Cooke, Delta and 11 more | 88 min |
| May 10, 1:38 PM CDT | Tornado Watch | SPC | Bowie, Camp, Cass, Collin, Delta, Fannin and 16 more | 10 hr |
| May 10, 3:59 PM CDT | Mesoscale Discussion | SPC | Bandera, Bell, Blanco, Bosque, Burnet, Coryell and 13 more | 2 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.