Alert archive / Oklahoma / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 684

September 18, 200224 counties in Oklahoma; 10 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Sep 18, 2002, 3:30 PM CDT for 24 counties in Oklahoma; 10 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Sep 18, 2002, 3:30 PM CDT (20:30 UTC)
Expired
Sep 18, 2002, 9:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 34 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, Noble County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Baylor County, TX, Childress County, TX, Cottle County, TX, Dickens County, TX, Foard County, TX, Hardeman County, TX, King County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 65 km from the middle of the area, began a volume at 20:31 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Sep 18, 4:24 PM CDTSevere Thunderstorm WarningOUNJackson, Kiowa51 min
Sep 18, 4:59 PM CDTSevere Thunderstorm WarningOUNWashita46 min
Sep 18, 5:00 PM CDTSevere Thunderstorm WarningLUBKing45 min
Sep 18, 5:10 PM CDTSevere Thunderstorm WarningOUNKiowa50 min
Sep 18, 5:26 PM CDTSevere Thunderstorm WarningOUNHarmon49 min
Sep 18, 5:34 PM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Custer41 min
Sep 18, 5:43 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Grant47 min
Sep 18, 5:54 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche66 min
Sep 18, 6:00 PM CDTSevere Thunderstorm WarningOUNKnox45 min
Sep 18, 6:03 PM CDTSevere Thunderstorm WarningOUNGreer42 min
Sep 18, 6:21 PM CDTSevere Thunderstorm WarningOUNBlaine39 min
Sep 18, 6:29 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Grant46 min
Sep 18, 6:36 PM CDTSevere Thunderstorm WarningOUNKiowa, Washita39 min
Sep 18, 6:41 PM CDTSevere Thunderstorm WarningOUNBlaine, Garfield, Major49 min
Sep 18, 6:46 PM CDTSevere Thunderstorm WarningOUNBaylor, Knox, Wilbarger44 min
Sep 18, 6:57 PM CDTSevere Thunderstorm WarningOUNCaddo, Grady63 min
Sep 18, 7:11 PM CDTSevere Thunderstorm WarningOUNGrant, Kay64 min
Sep 18, 7:13 PM CDTSevere Thunderstorm WarningOUNCuster32 min
Sep 18, 7:28 PM CDTSevere Thunderstorm WarningOUNBaylor47 min
Sep 18, 7:31 PM CDTSevere Thunderstorm WarningOUNGarfield, Major44 min
Sep 18, 7:55 PM CDTSevere Thunderstorm WarningOUNBlaine, Dewey50 min
Sep 18, 8:01 PM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Grady44 min
Sep 18, 8:12 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant, Kay, Major, Noble48 min
Sep 18, 8:30 PM CDTSevere Thunderstorm WarningOUNKingfisher45 min
Sep 18, 8:44 PM CDTSevere Thunderstorm WarningOUNCanadian46 min
Sep 18, 8:48 PM CDTSevere Thunderstorm WarningOUNBlaine, Custer42 min
Sep 18, 8:53 PM CDTSevere Thunderstorm WarningOUNWichita52 min

The nearest sounding before it

Fort Sill, OK (KFSI), launched 12:00Z, 8.5 hours before the alert went out and 84 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 Sill, OK at 12:00Z on 2002-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Sill, OK at 12:00Z on 2002-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 142 square meters per square second.1939Sfc1 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
2 J/kg
Mixed-layer CIN
-844 J/kg
Mixed-layer LCL
1817 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
142 m²/s²
0-3 km storm-relative helicity
185 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 18, 5:00 PM CDTSevere Thunderstorm WatchSPCBeckham5 hr

Nearby

Severe Thunderstorm Watches in Oklahoma, 2002Severe Thunderstorm Watches in Texas, 2002Every severe thunderstorm watch in 2002

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.