Alert archive / Texas / Severe Thunderstorm Watches in 2008

Severe Thunderstorm Watch 941

December 8, 200842 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Dec 8, 2008, 9:37 PM CST for 42 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Dec 8, 2008, 9:37 PM CST (03:37 UTC)
Expired
Dec 9, 2008, 3:00 AM CST
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 42 counties

Anderson County, TX, Bosque County, TX, Camp County, TX, Cherokee County, TX, Collin County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Franklin County, TX, Freestone County, TX, Grayson County, TX, Gregg County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Limestone County, TX, McLennan County, TX, Morris County, TX, Navarro County, TX, Parker County, TX, Rains County, TX, Red River County, TX, Rockwall County, TX, Smith County, TX, Somervell County, TX, Tarrant County, TX, Titus County, TX, Upshur County, TX, Van Zandt County, TX, Wise County, TX, Wood County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 46 km from the middle of the area, began a volume at 03:37 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
10%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
70%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Dec 8, 10:13 PM CSTSevere Thunderstorm WarningFWDGrayson47 min
Dec 8, 10:24 PM CSTTornado WarningFWDGrayson36 min
Dec 8, 11:09 PM CSTTornado WarningFWDCollin36 min
Dec 8, 11:51 PM CSTSevere Thunderstorm WarningFWDEllis, Hill, Navarro39 min
Dec 9, 12:29 AM CSTSevere Thunderstorm WarningFWDEllis, Navarro31 min
Dec 9, 12:53 AM CSTSevere Thunderstorm WarningFWDEllis, Henderson, Kaufman, Navarro40 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

Fort Worth, TX (KFWD), launched 00:00Z, 3.6 hours before the alert went out and 60 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.

Skew-T log-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2008-12-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 259 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2008-12-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 307 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
259 J/kg
Mixed-layer CIN
-225 J/kg
Mixed-layer LCL
1028 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
307 m²/s²
0-3 km storm-relative helicity
336 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 8, 7:10 PM CSTMesoscale DiscussionSPCBosque, Collin, Comanche, Cooke, Dallas, Denton and 14 more2 hr
Dec 8, 11:14 PM CSTMesoscale DiscussionSPCAnderson, Camp, Delta, Franklin, Freestone, Henderson and 16 more91 min
Dec 8, 11:31 PM CSTTornado WatchSPCAnderson, Bell, Bowie, Camp, Cass, Cherokee and 31 more7 hr
Dec 9, 2:17 AM CSTMesoscale DiscussionSPCAnderson, Bell, Bowie, Camp, Cass, Cherokee and 32 more58 min
Dec 9, 2:30 AM CSTMesoscale DiscussionSPCBosque, Collin, Dallas, Grayson30 min
Dec 9, 3:41 AM CSTMesoscale DiscussionSPCAnderson, Angelina, Bowie, Camp, Cass, Cherokee and 25 more64 min
Dec 9, 4:11 AM CSTTornado WatchSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more7 hr
Dec 9, 7:41 AM CSTMesoscale DiscussionSPCAngelina, Cass, Cherokee, Gregg, Harrison, Marion and 8 more64 min
Dec 9, 10:12 AM CSTMesoscale DiscussionSPCAngelina, Jasper, Nacogdoches, Newton, Panola, Sabine and 2 more93 min
Dec 9, 2:18 PM CSTMesoscale DiscussionSPCHardin, Jasper, Newton, Orange87 min
Dec 9, 3:51 PM CSTTornado WatchSPCJasper, Jefferson, Newton, Orange9 hr

Nearby

Severe Thunderstorm Watches in Texas, 2008Every severe thunderstorm watch in 2008

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.