Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 375, NWS Norman, OK

May 15, 200911 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 15, 2009, 7:44 PM CDT for 11 counties in Oklahoma. It was in force for 61 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
May 15, 2009, 7:44 PM CDT (00:44 UTC)
Expired
May 15, 2009, 8:45 PM CDT
In force
61 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Blaine County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Payne County, OK

The radar

The Vance AFB radar (KVNX), 63 km from the middle of the area, began a volume at 00:45 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.

IssuedProductOfficeLasted
May 15, 3:02 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 0.7 hours before the alert went out and 62 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, Lamont, OK at 00:00Z on 2009-05-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2691 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, Lamont, OK at 00:00Z on 2009-05-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
2691 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
1211 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 May 15, 6:22 PM CDT, 1 hour 22 minutes earlier.

Area forecast discussion, May 15, 6:22 PM CDT, 1 hour 22 minutes before
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Hazardous weather outlook, May 15, 5:22 PM CDT, 2 hours 22 minutes before
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In the hours before

Special weather statement, May 15, 4:00 PM CDT, 3 hours 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
400 PM CDT FRI MAY 15 2009

OKZ004-005-009-010-152115-
WOODWARD OK-HARPER OK-WOODS OK-ELLIS OK-
400 PM CDT FRI MAY 15 2009

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR ELLIS...HARPER...WOODS AND
WOODWARD COUNTIES.

A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 11 MILES NORTH OF
SELMAN TO CATESBY AT 400 PM CDT...MOVING EAST AT 25 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE.

PEOPLE IN ELLIS...HARPER...WOODS AND WOODWARD COUNTIES SHOULD MONITOR
THE WEATHER SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT
FOR THREATENING WEATHER CONDITIONS.

30
Local storm report, May 15, 4:26 PM CDT, 3 hours 18 minutes before
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Local storm report, May 15, 4:39 PM CDT, 3 hours 5 minutes before
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Special weather statement, May 15, 6:44 PM CDT, 1 hour before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 15, 7:28 PM CDTSevere Thunderstorm WarningOUNBeckham, Custer, Dewey, Roger Mills, Washita62 min
May 15, 7:32 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon, Jackson58 min
May 15, 7:54 PM CDTSevere Thunderstorm WarningOUNBeckham, Blaine, Caddo, Canadian, Custer, Dewey and 3 more66 min
May 15, 8:08 PM CDTSevere Thunderstorm WarningOUNHarmon, Jackson67 min
May 15, 8:28 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer, Jackson, Kiowa32 min
May 15, 8:46 PM CDTSevere Thunderstorm WarningOUNBlaine, Custer, Dewey, Kingfisher, Lincoln, Logan and 2 more59 min
May 15, 8:51 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Cotton, Jackson, Kiowa, Tillman54 min
May 15, 8:59 PM CDTAreal Flood AdvisoryOUNHarmon, Jackson3 hr
May 15, 9:01 PM CDTSevere Thunderstorm WarningOUNBlaine, Caddo, Canadian, Grady44 min
May 15, 9:21 PM CDTAreal Flood AdvisoryOUNKingfisher3 hr
May 15, 9:36 PM CDTAreal Flood AdvisoryOUNCanadian, Cleveland, Oklahoma4 hr
May 15, 10:10 PM CDTSevere Thunderstorm WarningOUNCanadian, Cleveland, McClain, Oklahoma36 min
May 16, 2:10 AM CDTRiver Flood WarningOUNPottawatomie, Seminole8 hr
May 16, 12:42 AM CDTAreal Flood AdvisoryOUNArcher, Clay, Wichita3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009Every severe thunderstorm warning in 2009

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.