Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 330, NWS Norman, OK

June 21, 1990Blaine County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 21, 1990, 1:48 AM CDT for Blaine County, Oklahoma. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
Jun 21, 1990, 1:48 AM CDT (06:48 UTC)
Expired
Jun 21, 1990, 2:30 AM CDT
In force
42 min
Issued by
NWS Norman, OK
Area
Whole counties

County Blaine County, OK

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 6.8 hours before the alert went out and 118 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 00:00Z on 1990-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1826 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 00:00Z on 1990-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 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
1826 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
1437 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
277 m²/s²
Significant tornado parameter
1.7
Supercell composite
12.1

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.

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 21, 2:13 AM CDTSevere Thunderstorm WarningOUNCanadian62 min
Jun 21, 3:04 PM CDTSevere Thunderstorm WarningOUNKay41 min
Jun 21, 3:53 PM CDTSevere Thunderstorm WarningOUNNoble52 min
Jun 21, 4:30 PM CDTSevere Thunderstorm WarningOUNWoods45 min
Jun 21, 5:22 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Grant53 min
Jun 21, 5:45 PM CDTSevere Thunderstorm WarningOUNEllis, Roger Mills45 min
Jun 21, 6:12 PM CDTSevere Thunderstorm WarningOUNGrant33 min
Jun 21, 6:33 PM CDTSevere Thunderstorm WarningOUNGarfield42 min
Jun 21, 6:38 PM CDTSevere Thunderstorm WarningOUNBlaine, Kingfisher52 min
Jun 21, 6:49 PM CDTSevere Thunderstorm WarningOUNBeckham, Roger Mills41 min
Jun 21, 6:52 PM CDTSevere Thunderstorm WarningOUNKay53 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1990Every severe thunderstorm warning in 1990

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.