Alert archive / Texas / Severe Thunderstorm Watches in 2007

Severe Thunderstorm Watch 705

October 16, 200716 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Oct 16, 2007, 11:45 PM CDT for 16 counties in Texas. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Oct 16, 2007, 11:45 PM CDT (04:45 UTC)
Expired
Oct 17, 2007, 1:45 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt

Counties Armstrong County, TX, Carson County, TX, Collingsworth County, TX, Donley County, TX, Gray County, TX, Hansford County, TX, Hemphill County, TX, Hutchinson County, TX, Lipscomb County, TX, Moore County, TX, Ochiltree County, TX, Potter County, TX, Randall County, TX, Roberts County, TX, Sherman County, TX, Wheeler County, TX

The radar

The Amarillo radar (KAMA), 42 km from the middle of the area, began a volume at 04:47 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
5%
Ten or more severe wind reports
20%
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
20%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Oct 16, 11:47 PM CDTSevere Thunderstorm WarningAMAArmstrong, Carson, Randall58 min
Oct 17, 12:06 AM CDTTornado WarningAMAArmstrong, Randall24 min
Oct 17, 12:11 AM CDTTornado WarningAMARandall34 min
Oct 17, 12:16 AM CDTSevere Thunderstorm WarningAMAHutchinson44 min
Oct 17, 12:47 AM CDTSevere Thunderstorm WarningAMAArmstrong, Carson, Potter, Randall58 min
Oct 17, 12:49 AM CDTSevere Thunderstorm WarningAMAArmstrong, Carson, Donley, Gray56 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 4.8 hours before the alert went out and 41 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, Amarillo Airport, TX at 00:00Z on 2007-10-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 234 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, Amarillo Airport, TX at 00:00Z on 2007-10-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 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
234 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
2083 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 16, 10:36 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 27 more114 min
Oct 17, 1:12 AM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Carson, Castro, Childress, Collingsworth and 24 more93 min
Oct 17, 1:36 AM CDTTornado WatchSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 18 more7 hr
Oct 17, 1:44 AM CDTSevere Thunderstorm WatchSPCHansford, Hutchinson, Lipscomb, Moore, Ochiltree, Potter and 3 more7 hr
Oct 17, 4:41 AM CDTMesoscale DiscussionSPCArcher, Baylor, Borden, Brown, Callahan, Coke and 32 more2 hr
Oct 17, 6:07 AM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Childress, Collingsworth, Cottle, Crosby and 19 more113 min
Oct 17, 6:50 AM CDTMesoscale DiscussionSPCHansford, Hutchinson, Lipscomb, Moore, Ochiltree, Potter and 2 more100 min
Oct 17, 7:43 AM CDTTornado WatchSPCArcher, Baylor, Clay, Foard, Hardeman, Knox and 2 more7 hr
Oct 17, 9:36 AM CDTMesoscale DiscussionSPCJasper, Jefferson, Newton, Orange, Panola, Sabine and 2 more114 min
Oct 17, 11:13 AM CDTTornado WatchSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 21 more7 hr
Oct 17, 1:20 PM CDTMesoscale DiscussionSPCCollin, Delta, Fannin, Grayson, Hunt, Lamar and 1 more85 min
Oct 17, 2:36 PM CDTMesoscale DiscussionSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 22 more114 min
Oct 17, 4:31 PM CDTTornado WatchSPCAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more7 hr

Nearby

Severe Thunderstorm Watches in Texas, 2007Every severe thunderstorm watch in 2007

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.