Alert archive / Texas / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 745

September 20, 200118 counties in Oklahoma; 22 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Sep 20, 2001, 3:45 PM CDT for 18 counties in Oklahoma; 22 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Sep 20, 2001, 3:45 PM CDT (20:45 UTC)
Expired
Sep 20, 2001, 9:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 40 counties

Alfalfa County, OK, Beaver County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Jackson County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Baylor County, TX, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Foard County, TX, Gray County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, King County, TX, Knox County, TX, Lipscomb County, TX, Motley County, TX, Ochiltree County, TX, Roberts County, TX, Wheeler County, TX, Wilbarger County, TX

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Sep 20, 3:56 PM CDTSevere Thunderstorm WarningLUBHall, Motley49 min
Sep 20, 4:21 PM CDTSevere Thunderstorm WarningLUBCottle39 min
Sep 20, 4:34 PM CDTSevere Thunderstorm WarningLUBChildress41 min
Sep 20, 4:37 PM CDTSevere Thunderstorm WarningLUBCrosby38 min
Sep 20, 4:49 PM CDTSevere Thunderstorm WarningAMAHemphill41 min
Sep 20, 4:59 PM CDTSevere Thunderstorm WarningLUBCottle46 min
Sep 20, 5:10 PM CDTFlash Flood WarningLUBCottle2 hr
Sep 20, 5:12 PM CDTSevere Thunderstorm WarningOUNWoods48 min
Sep 20, 5:28 PM CDTSevere Thunderstorm WarningLUBKing47 min
Sep 20, 5:29 PM CDTSevere Thunderstorm WarningAMAHemphill61 min
Sep 20, 5:32 PM CDTTornado WarningLUBKing43 min
Sep 20, 6:01 PM CDTSevere Thunderstorm WarningOUNWoods29 min
Sep 20, 6:04 PM CDTSevere Thunderstorm WarningAMAGray26 min
Sep 20, 6:05 PM CDTSevere Thunderstorm WarningAMAGray55 min
Sep 20, 6:16 PM CDTSevere Thunderstorm WarningLUBKing29 min
Sep 20, 6:17 PM CDTSevere Thunderstorm WarningOUNFoard28 min
Sep 20, 6:32 PM CDTTornado WarningOUNWoods28 min
Sep 20, 6:41 PM CDTSevere Thunderstorm WarningOUNFoard, Knox49 min
Sep 20, 6:47 PM CDTSevere Thunderstorm WarningLUBKing, Stonewall43 min
Sep 20, 6:48 PM CDTSevere Thunderstorm WarningOUNHarper42 min
Sep 20, 6:54 PM CDTSevere Thunderstorm WarningAMABeaver66 min
Sep 20, 7:05 PM CDTFlash Flood WarningLUBKing85 min
Sep 20, 7:14 PM CDTSevere Thunderstorm WarningAMARoberts61 min
Sep 20, 7:30 PM CDTSevere Thunderstorm WarningOUNHarper45 min
Sep 20, 7:57 PM CDTSevere Thunderstorm WarningAMALipscomb63 min
Sep 20, 8:03 PM CDTSevere Thunderstorm WarningAMABeaver87 min
Sep 20, 8:04 PM CDTSevere Thunderstorm WarningOUNWoodward41 min
Sep 20, 8:13 PM CDTSevere Thunderstorm WarningOUNEllis, Harper32 min
Sep 20, 8:20 PM CDTFlash Flood WarningAMABeaver3 hr
Sep 20, 8:45 PM CDTSevere Thunderstorm WarningOUNWoodward45 min

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 8.8 hours before the alert went out and 144 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 12:00Z on 2001-09-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1835 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 12:00Z on 2001-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.19395878Sfc1 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
1835 J/kg
Mixed-layer CIN
-174 J/kg
Mixed-layer LCL
1317 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 20, 6:00 PM CDTSevere Thunderstorm WatchSPCBorden, Coke, Crane, Fisher, Garza, Glasscock and 19 more5 hr

Nearby

Severe Thunderstorm Watches in Texas, 2001Severe Thunderstorm Watches in Oklahoma, 2001Every severe thunderstorm watch in 2001

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.