Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 55, NWS Norman, OK

April 2, 1994Grady County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 2, 1994, 4:09 PM CST for Grady County, Oklahoma. It was in force for 51 min.

The area

The counties it named.

The facts

Issued
Apr 2, 1994, 4:09 PM CST (22:09 UTC)
Expired
Apr 2, 1994, 5:00 PM CST
In force
51 min
Issued by
NWS Norman, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Grady County, OK

The radar

The Norman radar (KTLX), 65 km from the middle of the area, began a volume at 22:08 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.2 hours before the alert went out and 49 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 1994-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 1994-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 204 square meters per square second.1939587897Sfc1 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
1 J/kg
Mixed-layer CIN
-689 J/kg
Mixed-layer LCL
1160 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
204 m²/s²
0-3 km storm-relative helicity
327 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 2, 11:09 AM CST, 5 hours earlier.

Area forecast discussion, Apr 2, 11:09 AM CST, 5 hours before
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In the hours before

Special weather statement, Apr 2, 12:41 PM CST, 3 hours 28 minutes before
OKZ004>053-TXZ083>090-021400-

THUNDERSTORM OUTLOOK
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
1240 PM CST SAT APR 2 1994

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING OVER MUCH OF OKLAHOMA AND THE WEST PART OF NORTH TEXAS.

THE SLIGHT RISK AREA IS GENERALLY EAST OF A LINE FROM LAVERNE TO
WOODWARD TO FREDERICK TO SEYMOUR TEXAS.

SURFACE MOISTURE IS SLOWLY MOVING INTO OKLAHOMA.  THIS SURFACE MOISTURE
IS SHALLOW WHICH MAY BE A LIMITING FACTOR TO SEVERE THUNDERSTORM
DEVELOPMENT...BUT THE ATMOSPHERE OVER OKLAHOMA AND NORTH TEXAS WAS
BEGINNING TO DESTABILIZE.  AN UPPER LEVEL STORM SYSTEM MOVING INTO THE
AREA FROM SOUTHEASTERN COLORADO AND A COLD FRONT IN NORTHWESTERN
OKLAHOMA WILL PROVIDE SUPPORT FOR SCATTERED SHOWERS AND THUNDERSTORMS TO
DEVELOP.  A DRYLINE IN WESTERN OKLAHOMA AND THE WESTERN PART OF NORTH
TEXAS WILL ALSO PROVIDE A FOCUS FOR THUNDERSTORM DEVELOPMENT.  THE
INSTABILITY OF THE ATMOSPHERE INDICATE THAT IF STORMS DEVELOP...SOME OF
THESE STORMS WILL LIKELY BECOME SEVERE.  THE MOST FAVORABLE AREA FOR
SEVERE THUNDERSTORM DEVELOPMENT IS TO THE SOUTH OF THE COLD FRONT AND
EAST OF THE DRYLINE...BUT OTHER ISOLATED SEVERE STORMS ARE POSSIBLE IN
NORTHWESTERN OKLAHOMA AS THE UPPER-LEVEL STORM SYSTEM APPROACHES
TONIGHT.  THE SHALLOW MOISTURE AT THE SURFACE WILL BE A LIMITING FACTOR
TO THE POSSIBILITY OF SEVERE STORMS.

THE WINDS PROFILE INDICATES THAT THE MAJOR THREAT WITH THESE STORMS WILL
BEb LARGE HAIL AND STRONG WINDS.  ISOLATED TORNADOES WILL ALSO BE
POSSIBLE.

SPEG/KLH
Local storm report, Apr 2, 4:01 PM CST, 8 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
400 PM CST SAT APR 02 1994

TIME               COUNTY               LOCATION/EVENT

356 PM             GARFIELD            QUARTER SIZE HAIHL 3 MILES NORTH
                                       1 MILE WEST OF DRUMOND.

358 PM             GARFIELD            QUATER SIZE HAIL COVERING GROUND
                                       IN DRUMOND.
ALA

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 2, 3:54 PM CSTSevere Thunderstorm WarningOUNGarfield51 min
Apr 2, 4:35 PM CSTSevere Thunderstorm WarningOUNGarfield, Noble40 min
Apr 2, 4:42 PM CSTSevere Thunderstorm WarningOUNOklahoma48 min
Apr 2, 4:47 PM CSTSevere Thunderstorm WarningOUNCleveland, McClain43 min
Apr 2, 4:56 PM CSTSevere Thunderstorm WarningOUNLogan49 min
Apr 2, 5:03 PM CSTSevere Thunderstorm WarningOUNPayne42 min
Apr 2, 5:11 PM CSTSevere Thunderstorm WarningOUNLincoln49 min
Apr 2, 5:21 PM CSTSevere Thunderstorm WarningOUNGrant39 min
Apr 2, 5:24 PM CSTSevere Thunderstorm WarningOUNCleveland, McClain, Pottawatomie51 min
Apr 2, 5:32 PM CSTTornado WarningOUNMcClain28 min
Apr 2, 5:40 PM CSTSevere Thunderstorm WarningOUNPayne50 min
Apr 2, 5:43 PM CSTSevere Thunderstorm WarningOUNLincoln47 min
Apr 2, 5:47 PM CSTSevere Thunderstorm WarningOUNCarter43 min
Apr 2, 5:49 PM CSTSevere Thunderstorm WarningOUNGarvin41 min
Apr 2, 5:52 PM CSTTornado WarningOUNGarvin, Pontotoc53 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1994Every severe thunderstorm warning in 1994

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; radar from the NEXRAD Level II archive.