Alert archive / Oklahoma / Tornado Watches in 1998

Tornado Watch 627

June 20, 199830 counties in Oklahoma; 18 counties in Texas

The Storm Prediction Center issued this tornado watch at Jun 20, 1998, 5:30 PM CDT for 30 counties in Oklahoma; 18 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Jun 20, 1998, 5:30 PM CDT (22:30 UTC)
Expired
Jun 21, 1998, 12:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
All 48 counties

Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Fisher County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Jones County, TX, King County, TX, Knox County, TX, Scurry County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Jun 20, 5:35 PM CDTSevere Thunderstorm WarningOUNGarfield, Kingfisher40 min
Jun 20, 5:43 PM CDTSevere Thunderstorm WarningLUBStonewall32 min
Jun 20, 5:52 PM CDTSevere Thunderstorm WarningSJTHaskell63 min
Jun 20, 5:58 PM CDTSevere Thunderstorm WarningSJTJones62 min
Jun 20, 5:59 PM CDTSevere Thunderstorm WarningOUNBlaine, Canadian46 min
Jun 20, 6:03 PM CDTSevere Thunderstorm WarningOUNComanche, Kiowa42 min
Jun 20, 6:14 PM CDTSevere Thunderstorm WarningOUNGarfield46 min
Jun 20, 6:17 PM CDTSevere Thunderstorm WarningOUNCaddo43 min
Jun 20, 6:18 PM CDTTornado WarningSJTJones47 min
Jun 20, 6:23 PM CDTSevere Thunderstorm WarningSJTFisher47 min
Jun 20, 6:37 PM CDTSevere Thunderstorm WarningOUNKingfisher53 min
Jun 20, 6:44 PM CDTSevere Thunderstorm WarningOUNBlaine46 min
Jun 20, 6:54 PM CDTSevere Thunderstorm WarningOUNComanche51 min
Jun 20, 6:58 PM CDTTornado WarningOUNKingfisher32 min
Jun 20, 6:59 PM CDTSevere Thunderstorm WarningOUNCanadian46 min
Jun 20, 7:02 PM CDTSevere Thunderstorm WarningOUNGarfield, Grant33 min
Jun 20, 7:06 PM CDTSevere Thunderstorm WarningSJTJones44 min
Jun 20, 7:18 PM CDTSevere Thunderstorm WarningSJTShackelford62 min
Jun 20, 7:20 PM CDTSevere Thunderstorm WarningOUNKay40 min
Jun 20, 7:28 PM CDTSevere Thunderstorm WarningOUNKingfisher32 min
Jun 20, 7:44 PM CDTSevere Thunderstorm WarningOUNCanadian26 min
Jun 20, 7:51 PM CDTSevere Thunderstorm WarningSJTJones64 min
Jun 20, 7:59 PM CDTSevere Thunderstorm WarningOUNKingfisher, Logan26 min
Jun 20, 8:07 PM CDTSevere Thunderstorm WarningOUNOklahoma23 min
Jun 20, 8:10 PM CDTSevere Thunderstorm WarningOUNCanadian20 min
Jun 20, 8:25 PM CDTSevere Thunderstorm WarningOUNLogan20 min
Jun 20, 8:30 PM CDTSevere Thunderstorm WarningOUNCanadian, Oklahoma30 min
Jun 20, 8:41 PM CDTSevere Thunderstorm WarningOUNLincoln34 min
Jun 20, 8:44 PM CDTSevere Thunderstorm WarningOUNLogan31 min
Jun 20, 8:54 PM CDTSevere Thunderstorm WarningSJTFisher61 min
Jun 20, 8:57 PM CDTSevere Thunderstorm WarningOUNOklahoma33 min
Jun 20, 11:06 PM CDTSevere Thunderstorm WarningOUNGrant, Kay39 min
Jun 20, 11:20 PM CDTSevere Thunderstorm WarningOUNGrant40 min
Jun 20, 11:57 PM CDTSevere Thunderstorm WarningOUNGrant, Kay48 min

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.5 hours before the alert went out and 184 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, Norman, OK at 12:00Z on 1998-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2460 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, Norman, OK at 12:00Z on 1998-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 298 square meters per square second.193958Sfc1 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
2460 J/kg
Mixed-layer CIN
-329 J/kg
Mixed-layer LCL
1297 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
298 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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.

Nearby

Tornado Watches in Oklahoma, 1998Tornado Watches in Texas, 1998Every tornado watch in 1998

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.