Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 252, NWS Norman, OK

May 19, 1990Cleveland County, Oklahoma County, Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 19, 1990, 8:11 PM CDT for Cleveland County, Oklahoma County, Pottawatomie County, Oklahoma. It was in force for 49 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 19, 1990, 8:11 PM CDT (01:11 UTC)
Expired
May 19, 1990, 9:00 PM CDT
In force
49 min
Issued by
NWS Norman, OK
Area
Whole counties

Counties Cleveland County, OK, Oklahoma County, OK, Pottawatomie County, OK

The radar

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

What was reported inside it

TimeReportWhereRemark
May 19, 8:34 PM CDTHail 1Oklahoma, OK

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.2 hours before the alert went out and 19 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

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KOKC 200113
SVROKC
OKC027-109-125-200200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
811 PM CDT SAT MAY 19 1990
 
THE NATIONAL WEATHER SERVICE IN OKLAHOMA CITY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  900 PM CDT
FOR THE FOLLOWING OKLAHOMA LOCATIONS...
 
IN CENTRAL OKLAHOMA
 
   ...NORTHEASTERN CLEVELAND COUNTY...OKLAHOMA COUNTY
   ...NORTHERN POTTAWATOMIE COUNTY
 
AT 811 PM RADAR INDICATED SEVERE THUNDERSTORMS NEAR LAKE DRAPER AND IN
THE OKLAHOMA CITY METROPOLITAN AREA FROM NEAR WARR ACRES TO NEAR
SPENCER MOVING EAST-NORTHEAST AT 15 MPH. HAIL TO GOLF BALL SIZE AND
STRONG WINDS ARE LIKELY.
 
 
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCE WARNING.  REMAIN CALM BUT BE ALERT TO
RAPIDLY CHANGING WEATHER CONDITIONS.

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, 8:45 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, 1:33 AM CDTSevere Thunderstorm WarningOUNLincoln42 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.