Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 397, NWS Norman, OK

May 13, 2008Hughes County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 13, 2008, 8:11 PM CDT for Hughes County, Oklahoma. It was in force for 49 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 13, 2008, 8:11 PM CDT (01:11 UTC)
Expired: May 13, 2008, 9:00 PM CDT
In force: 49 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Hughes County, OK

The radar

The Norman radar (KTLX), 99 km from the middle of the area, began a volume at 01:11 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
May 13, 2:03 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.2 hours before the alert went out and 106 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: 1108 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 1441 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 247 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 7.1

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 13, 8:02 PM CDT, 9 minutes earlier.

Area forecast discussion, May 13, 8:02 PM CDT, 9 minutes before

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Hazardous weather outlook, May 13, 2:55 PM CDT, 5 hours 16 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
255 PM CDT TUE MAY 13 2008

OKZ004>048-050>052-TXZ083>090-141200-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
255 PM CDT TUE MAY 13 2008

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
THIS EVENING ACROSS PORTIONS OF OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
THE MODERATE RISK COVERS LOCATIONS EAST OF A LINE EXTENDING FROM
CHANDLER AND SHAWNEE...TO PAULS VALLEY AND DUNCAN...TO HENRIETTA
TEXAS. A SLIGHT RISK AREA SURROUNDS THE MODERATE RISK AND COVERS
LOCATIONS AS FAR WEST AS ENID...WEATHERFORD...AND LAWTON IN
OKLAHOMA...AND VERNON AND BENJAMIN IN TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM 4 PM
UNTIL MIDNIGHT. THE MAIN HAZARD DURING THIS RANGE OF TIME WILL BE
VERY LARGE HAIL AND DAMAGING WINDS. A FEW TORNADOES WILL ALSO BE
POSSIBLE IN THE MODERATE RISK AREA. TOWARD AND AFTER MIDNIGHT...
THUNDERSTORMS WILL LIKELY EVOLVE INTO ONE OR MORE LINES AND CLUSTERS
WITH THE POTENTIAL FOR LARGE HAIL AND DAMAGING WIND GUSTS CONTINUING.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD BE PREPARED FOR SEVERE WEATHER OPERATIONS FROM 4 PM
THROUGH TONIGHT.

DISCUSSION...
A COLD FRONT WILL BECOME STATIONARY NEAR OR JUST EAST OF THE
INTERSTATE-44 CORRIDOR...OR NEAR THE WESTERN EDGE OF THE MODERATE
RISK AREA. RECENT OBSERVATIONS INDICATE THAT THE CAP HAS WEAKENED
BUT IS NOT COMPLETELY ERODED. HOWEVER...CONVERGENCE ALONG A
PRE-FRONTAL TROUGH IS EXPECTED TO BE SUFFICIENT FOR AT LEAST
ISOLATED STORM DEVELOPMENT LATE THIS AFTERNOON. THE WIND AND THERMAL
PROFILES WILL BE SUFFICIENT FOR SUPERCELL THUNDERSTORMS... SOME OF
WHICH MAY BE LONG-LIVED AND SIGNIFICANT...AND PRODUCE EXTREMELY
LARGE AND DAMAGING HAIL. DAMAGING WINDS WILL BE A SECONDARY
CONCERN...WITH AN ATTENDANT THREAT OF TORNADOES IN THE MODERATE RISK
AREA WITH ANY SUPERCELLS THAT DEVELOP SIGNIFICANT DEVIANT MOTION.

LATER THIS EVENING...THE MENTIONED COLD FRONT IS EXPECTED TO MOVE
SOUTHWARD AND STALL AGAIN NEAR THE RED RIVER. STORM ORGANIZATION IS
EXPECTED TO BECOME MORE LINEAR NEAR THE COLD FRONT AT THIS TIME...
AND EVOLVE INTO A LARGE EAST AND SOUTHEAST MOVING COMPLEX. LARGE
HAIL...DAMAGING WINDS...AND FLASH FLOODING RAINS WILL REMAIN A
THREAT WITH ANY STORM COMPLEX INTO THE OVERNIGHT HOURS.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT WEDNESDAY MAY 14.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR... 80 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK FOR THUNDERSTORMS SOUTH OF A LINE FROM HOBART
TO SEMINOLE ON WEDNESDAY AS A SLOW-MOVING UPPER-LEVEL STORM SYSTEM
MOVES FROM SOUTHERN NEW MEXICO INTO NORTH TEXAS. THIS WILL PROVIDE
INCREASING FAVORABLE WIND AND THERMAL STRUCTURES FOR A FEW SEVERE
THUNDERSTORMS.

OTHER HAZARDOUS WEATHER...
HEAVY RAINFALL THAT MAY FORM ACROSS OKLAHOMA AND WESTERN NORTH TEXAS
WEDNESDAY THROUGH WEDNESDAY NIGHT COULD CAUSE FLOODING. A FLOOD
WATCH MAY BECOME NECESSARY FOR THIS AREA.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
WEDNESDAY.

11

In the hours before

Special weather statement, May 13, 5:34 PM CDT, 2 hours 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
534 PM CDT TUE MAY 13 2008

OKZ029-030-132300-
POTTAWATOMIE OK-CLEVELAND OK-
534 PM CDT TUE MAY 13 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CLEVELAND AND POTTAWATOMIE
COUNTIES.

A STRONG THUNDERSTORM WAS LOCATED OVER EXTREME SOUTHEASTERN OKLAHOMA
CITY AT 534 PM CDT...MOVING NORTHEAST AT 19 MPH. SMALL HAIL AND WIND
GUSTS TO 50 MPH ARE POSSIBLE. BRIEF HEAVY RAIN WILL ALSO BE LIKELY.

STORM INTENSITY IS INCREASING AND SEVERE WEATHER MAY DEVELOP RAPIDLY.

PEOPLE IN CLEVELAND AND POTTAWATOMIE COUNTIES...INCLUDING THE CITIES
OF NORMAN AND OKLAHOMA CITY...SHOULD MONITOR THE WEATHER SITUATION
CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER
CONDITIONS.

MAXWELL

Local storm report, May 13, 5:37 PM CDT, 2 hours 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
537 PM CDT TUE MAY 13 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0536 PM     HAIL             3 N MEEKER              35.55N 96.89W
05/13/2008  E0.88 INCH       LINCOLN            OK   EMERGENCY MNGR

&&

JPIKE

Special weather statement, May 13, 6:34 PM CDT, 1 hour 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
634 PM CDT TUE MAY 13 2008

TXZ089-132345-
ARCHER TX-
634 PM CDT TUE MAY 13 2008

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR ARCHER COUNTY.

A SEVERE THUNDERSTORM WAS LOCATED IN NORTHWEST YOUNG COUNTY 5 MILES
NORTHEAST OF ELBERT AT 634 PM CDT...MOVING NORTHEAST AT 33 MPH. THIS
STORM WILL MOVE INTO SOUTHERN ARCHER COUNTY AND WILL BE CAPABLE OF
PRODUCING LARGE HAIL.

PEOPLE IN ARCHER COUNTY SHOULD MONITOR THE WEATHER SITUATION CLOSELY.
LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER
CONDITIONS.

..SPEG.

Special weather statement, May 13, 7:21 PM CDT, 50 minutes before

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Local storm report, May 13, 7:52 PM CDT, 19 minutes before

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Local storm report, May 13, 7:56 PM CDT, 15 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
May 13, 7:24 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	35 min
May 13, 7:30 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Pottawatomie	45 min
May 13, 8:49 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	41 min
May 13, 9:01 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	29 min
May 13, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	35 min
May 13, 7:29 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	46 min
May 13, 9:31 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	44 min
May 14, 12:16 AM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman, Knox	29 min
May 14, 12:44 AM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	15 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2008 Every severe thunderstorm warning in 2008

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.