Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 264, NWS Norman, OK

May 20, 1990Lincoln County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 20, 1990, 1:33 AM CDT for Lincoln County, Oklahoma. It was in force for 42 min.

The area

The counties it named.

The facts

Issued
May 20, 1990, 1:33 AM CDT (06:33 UTC)
Expired
May 20, 1990, 2:15 AM CDT
In force
42 min
Issued by
NWS Norman, OK
Area
Whole counties

County Lincoln 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, 6.6 hours before the alert went out and 71 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 1990-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3426 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 1990-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 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
3426 J/kg
Mixed-layer CIN
-16 J/kg
Mixed-layer LCL
1439 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.5
Supercell composite
5.6

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.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, May 19, 8:16 PM CDT, 5 hours 17 minutes before
TXZ020-200200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA FALLS TX
815 PM CDT SAT MAY 19 1990

...ACTIVE WEATHER REMAINS NORTH OF THE RED RIVER...

A STATIONARY FRONTAL BOUNDARY CUT THROUGH OKLAHOMA FROM TULSA TO NEAR
OKLAHOMA CITY TO SOUTHWEST OKLAHOMA.

THE DRY LINE/DEW POINT LINE THAT WAS JUST WEST OF WICHITA FALLS
AROUND 5PM HAD RETREATED TO WEST OF CHILDRESS AT SUNSET.

SEVERE THUNDERSTORMS WERE OCCURRING IN THE OKLAHOMA CITY AREA AND
EXTENDED NORTHEAST. MOVEMENT APPEARS TO BE SLOWLY TOWARDS THE NORTH.

A TORNADO WATCH REMAINS IN EFFECT FOR MUCH OF SOUTH CENTRAL...
CENTRAL AND EASTERN OKLAHOMA UNTIL MIDNIGHT.

LOCALLY... THE THREAT OF THUNDERSTORM DEVELOPMENT THIS NEVENING
APPEARS TO BE DIMINISHING.

AREA RESIDENTS SHOULD EXPECT THE NEXT GOOD CHANCE FOR THUNDERSTORMS
TO BE ON SUNDAY. ANOTHER HOT DAY IS FORECAST WITH THE DRY LINE/DEW
POINT LINE FORECAST TO MOVE EAST THROUGH THE REGION ON SUNDAY.

The office that day

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

IssuedProductOfficeCountiesLasted
May 19, 7:14 PM CDTSevere Thunderstorm WarningOUNLincoln, Payne46 min
May 19, 7:22 PM CDTSevere Thunderstorm WarningOUNCleveland, Oklahoma53 min
May 19, 7:32 PM CDTSevere Thunderstorm WarningOUNLincoln, Pottawatomie43 min
May 19, 7:35 PM CDTSevere Thunderstorm WarningOUNPayne40 min
May 19, 7:58 PM CDTSevere Thunderstorm WarningOUNLincoln47 min
May 19, 8:01 PM CDTSevere Thunderstorm WarningOUNLogan44 min
May 19, 8:11 PM CDTSevere Thunderstorm WarningOUNCleveland, Oklahoma, Pottawatomie49 min
May 19, 8:45 PM CDTSevere Thunderstorm WarningOUNLincoln45 min
May 19, 8:58 PM CDTSevere Thunderstorm WarningOUNLogan, Oklahoma47 min
May 19, 9:22 PM CDTSevere Thunderstorm WarningOUNPottawatomie, Seminole23 min
May 19, 9:28 PM CDTSevere Thunderstorm WarningOUNCanadian32 min
May 19, 9:39 PM CDTSevere Thunderstorm WarningOUNLincoln, Pottawatomie, Seminole66 min
May 19, 9:44 PM CDTSevere Thunderstorm WarningOUNCanadian, Oklahoma46 min
May 19, 10:03 PM CDTFlash Flood WarningOUNOklahoma117 min
May 19, 10:28 PM CDTSevere Thunderstorm WarningOUNCanadian, Oklahoma62 min
May 19, 10:41 PM CDTSevere Thunderstorm WarningOUNPottawatomie49 min
May 19, 11:30 PM CDTSevere Thunderstorm WarningOUNCanadian, Oklahoma60 min
May 19, 11:52 PM CDTFlash Flood WarningOUNOklahoma3 hr
May 20, 12:44 AM CDTSevere Thunderstorm WarningOUNOklahoma61 min
May 20, 12:49 AM CDTSevere Thunderstorm WarningOUNPottawatomie56 min
May 20, 1:49 AM CDTSevere Thunderstorm WarningOUNHughes, Seminole56 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.