Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 73, NWS Norman, OK

April 25, 2005Seminole County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 25, 2005, 9:25 PM CDT for Seminole County, Oklahoma. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 25, 2005, 9:25 PM CDT (02:25 UTC)
Expired: Apr 25, 2005, 10:00 PM CDT
In force: 35 min
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Seminole County, OK

The radar

The Norman radar (KTLX), 63 km from the middle of the area, began a volume at 02:26 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 25, 7:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.4 hours before the alert went out and 72 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: 239 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1786 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

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 25, 9:25 PM CDT, 0 minutes earlier.

Area forecast discussion, Apr 25, 9:25 PM CDT, 0 minutes before

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Hazardous weather outlook, Apr 25, 6:41 PM CDT, 2 hours 44 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
641 PM CDT MON APR 25 2005

OKZ004>048-050>052-TXZ083>090-261200-

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...THIS EVENING AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
TONIGHT ACROSS PARTS OF SOUTH CENTRAL AND SOUTHEAST OKLAHOMA.

LOCATION...
THE SLIGHT RISK AREA IS EAST OF A LINE FROM WAURIKA TO PAULS VALLEY
TO SEMINOLE.

TIMING...
SEVERE THUNDERSTORMS WILL BE POSSIBLE THROUGH THE LATE EVENING HOURS.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD CONTINUE TO PLAN FOR SEVERE WEATHER OPERATIONS
THROUGH LATE EVENING.

DISCUSSION...
DETAILS ON THE DEVELOPMENT...POSITION AND MOVEMENT OF KEY WEATHER
FEATURES WILL BE CONTAINED IN THE LATEST REGIONAL WEATHER DISCUSSION
ISSUED BY NWS NORMAN...AND IN GRAPHICS AVAILABLE ON OUR WEBSITE AT
WEATHER.GOV/NORMAN.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY APR 26.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...25 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS WILL BE POSSIBLE AGAIN LATE IN THE WEEK.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 700
AM TUESDAY MORNING.

24

In the hours before

Special weather statement, Apr 25, 8:42 PM CDT, 43 minutes before

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Special weather statement, Apr 25, 8:55 PM CDT, 30 minutes before

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Local storm report, Apr 25, 9:06 PM CDT, 19 minutes before

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Special weather statement, Apr 25, 9:08 PM CDT, 17 minutes before

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Special weather statement, Apr 25, 9:12 PM CDT, 13 minutes before

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Special weather statement, Apr 25, 9:17 PM CDT, 8 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 25, 7:37 PM CDT	Severe Thunderstorm Warning	OUN	Johnston, Murray	38 min
Apr 25, 8:58 PM CDT	Severe Thunderstorm Warning	OUN	Johnston	17 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2005 Every severe thunderstorm warning in 2005

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.