Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 87, NWS Norman, OK

April 9, 1990Stephens County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 9, 1990, 10:57 PM CDT for Stephens County, Oklahoma. It was in force for 48 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: Apr 9, 1990, 10:57 PM CDT (03:57 UTC)
Expired: Apr 9, 1990, 11:45 PM CDT
In force: 48 min
Issued by: NWS Norman, OK
Area: Whole counties

County Stephens 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

Time	Report	Where	Remark
Apr 9, 11:05 PM CDT	Hail 0.75	Stephens, 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

Fort Sill, OK (KFSI), launched 00:00Z, 4.0 hours before the alert went out and 53 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 872 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 692 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 187 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 6.1

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.

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, Apr 9, 5:34 PM CDT, 5 hours 23 minutes before

TXZALL-092330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA FALLS TX
534 PM CDT MON APR 9 1990

...TORNADO WATCH IS IN EFFECT UNTIL 10 PM CDT THIS MONDAY AFTERNOON
AND EVENING FOR THIS PORTION OF NORTH CENTRAL TEXAS AND SOUTHWESTERN
OKLAHOMA...

AT 530 CDT RADAR INDICATED A FEW THUNDERSHOWERS..DECREASING IN
INTENSITY..ACROSS YOUNG AND SOUTHERN ARCHER COUNTIES. IN OKLAHOMA VERY
STRONG THUNDERSTORMS WERE WELL NORTHEAST OF WIICHITA FALLS FROM ALEX
TO PURCELL. MOVEMENT WAS NORTHEAST AT 25 MPH.

REMEMBER A TORNADO WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS TO DEVELOP IN AND NEAR THE WATCH
AREA. BE ALERT TO THREATENING WEATHER CONDITIO@NS AND LISTEN FOR LATER
STATEMENTS AND POSSIBLE WARNINGS.

Special weather statement, Apr 9, 6:27 PM CDT, 4 hours 30 minutes before

TXZALL-100030-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA FALLS TX
628 PM CDT MON APR 9 1990

A TORNADO WATCH REMAINS IN EFFECT FOR THIS PORTION OF NORTH CENTRAL
TEXAS AND SOUTHWESTERN OKLAHOMA UNTIL 10 PM CDT THIS MONDAY AFTERNOON
AND EVENING...

AT 625 PM CDT RADAR INDICATED LIGHT RAIN SHOWERS IN YOUNG AND JACK
COUNTIES. VERY STRONG THUNDERSTORMS WERE NORTH OF ABILENE AND BETWEEN
LUBBOCK AND CHILDRESS. MOVEMENT WAS NORTHEAST AT 30 MPH. IN OKLAHOMA
SEVERE THUNDERSTORMS WERE NORTH AND EAST OF GAGE MOVING EAST AT 30
MPH.

REMEMBER..A TORNADO WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS TO DEVELOP IN AND CLOSE TO THE
WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE ALERT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND
POSSIBLE WARNINGS.

Local storm report, Apr 9, 7:11 PM CDT, 3 hours 46 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
710 PM CDT MON APR 9 1990

TIME(CDT)    COUNTY           EVENT

555 PM       WOODS            NICKEL SIZED HAIL ON THE WEST SIDE OF ALVA.
620 PM       HARPER           ROTATING WALL CLOUD 4 TO 5 MILES NORTH OF
                              FORT SUPPLY.
625 PM       HARPER           NICKEL SIZED HAIL 18 MILES SOUTHEAST OF
                              BUFFALO.
645 PM       WOODS            QUARTER SIZED HAIL AT WAYNOKA.
650 PM       ALFALFA          .75 INCH HAIL 1/4 MILE EAST OF THE ALFALFA
                              COUNTY-WOODS COUNTY LINE ON HIGHWAY 64.
705 PM       ALFALFA          GOLFBALL SIZED HAIL NORTH AND WEST OF
                              CHEROKEE.

Special weather statement, Apr 9, 10:35 PM CDT, 22 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:01 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	44 min
Apr 9, 7:45 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant	60 min
Apr 9, 7:45 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	60 min
Apr 9, 8:30 PM CDT	Severe Thunderstorm Warning	OUN	Garfield	60 min
Apr 9, 8:56 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Kiowa	64 min
Apr 9, 9:07 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	68 min
Apr 9, 9:10 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	65 min
Apr 9, 9:54 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	66 min
Apr 9, 9:58 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson	62 min
Apr 9, 10:07 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble	68 min
Apr 9, 10:07 PM CDT	Severe Thunderstorm Warning	OUN	Payne	68 min
Apr 9, 10:07 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey	68 min
Apr 9, 10:26 PM CDT	Tornado Warning	OUN	Cotton	49 min
Apr 9, 11:05 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love	55 min
Apr 9, 11:15 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	45 min
Apr 9, 11:57 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love	63 min
Apr 10, 12:07 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	53 min
Apr 10, 12:12 AM CDT	Severe Thunderstorm Warning	OUN	Carter	48 min
Apr 10, 12:39 AM CDT	Severe Thunderstorm Warning	OUN	Johnston, Marshall	66 min
Apr 10, 1:00 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Love	60 min
Apr 10, 1:30 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	45 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1990 Every 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.