Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 164, NWS Norman, OK

April 26, 20134 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 26, 2013, 7:06 PM CDT for 4 counties in Oklahoma. It was in force for 54 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 26, 2013, 7:06 PM CDT (00:06 UTC)
Expired: Apr 26, 2013, 8:00 PM CDT
In force: 54 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Beckham County, OK, Custer County, OK, Roger Mills County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 128 km from the middle of the area, began a volume at 00:07 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 26, 3:38 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.1 hours before the alert went out and 178 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: 13 J/kg
Mixed-layer CIN: -220 J/kg
Mixed-layer LCL: 805 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 26, 6:39 PM CDT, 27 minutes earlier.

Area forecast discussion, Apr 26, 6:39 PM CDT, 27 minutes before

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Hazardous weather outlook, Apr 26, 4:36 PM CDT, 2 hours 30 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
436 PM CDT FRI APR 26 2013

OKZ004>048-050>052-TXZ083>090-271715-
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-
436 PM CDT FRI APR 26 2013

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

.DAY ONE...THROUGH TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A RISK OF SEVERE THUNDERSTORMS THROUGH ABOUT 2 AM ACROSS
PORTIONS OF OKLAHOMA.

LOCATION...
THE RISK AREA COVERS LOCATIONS BETWEEN THE RED RIVER AND A LINE
EXTENDING FROM BUFFALO TO STILLWATER.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL 5 PM THROUGH 2 AM.

IMPACTS...
THE PRIMARY HAZARD WILL BE HAIL TO THE SIZE OF GOLFBALLS. HOWEVER...
A FEW OF THE STORMS INITIALLY COULD PRODUCE HAIL THE SIZE OF TENNIS
BALLS ACROSS WESTERN OKLAHOMA.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS THROUGH THE EARLY
MORNING HOURS SATURDAY.

DISCUSSION...
SCATTERED STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP
LATE IN THE AFTERNOON AND EARLY EVENING ACROSS NORTHWEST AND WEST
CENTRAL OKLAHOMA. THESE STORMS MAY INITIALLY BE DISCRETE STORMS
CAPABLE OF PRODUCING VERY LARGE HAIL. THESE STORMS ARE EXPECTED TO
THEN INTERACT AND FORM A COMPLEX OF STORMS THAT WILL MOVE SOUTHEAST
ACROSS CENTRAL AND SOUTHERN OKLAHOMA THROUGH THE EVENING INTO THE
OVERNIGHT HOURS.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SATURDAY APR 27.
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...SATURDAY THROUGH THURSDAY...

THUNDERSTORM OUTLOOK...
AFTER A PERIOD OF QUIET WEATHER THROUGH THE WEEKEND AND EARLY NEXT
WEEK...THUNDERSTORM CHANCES WILL RETURN AS ANOTHER SYSTEM MOVES THROUGH
THE REGION TUESDAY THROUGH WEDNESDAY.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AROUND
5 AM SATURDAY.

11

In the hours before

Special weather statement, Apr 26, 4:24 PM CDT, 2 hours 42 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
424 PM CDT FRI APR 26 2013

OKZ004-009-262215-
HARPER OK-ELLIS OK-
424 PM CDT FRI APR 26 2013

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN HARPER AND ELLIS
COUNTIES UNTIL 515 PM CDT...

AT 424 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING
FROM 9 MILES WEST OF SLAPOUT TO 7 MILES NORTH OF GLAZIER...MOVING
EAST AT 30 MPH.

HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
HALF INCH IN DIAMETER HAIL...

LOCATIONS IMPACTED INCLUDE...
SHATTUCK...LAVERNE...ARNETT...GAGE...ROSSTON...MAY AND CATESBY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3686 10000 3686 9997 3667 9967 3600 9964
      3603 10000
TIME...MOT...LOC 2116Z 275DEG 27KT 3659 10028 3612 10030

MBS

Special weather statement, Apr 26, 5:12 PM CDT, 1 hour 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
512 PM CDT FRI APR 26 2013

OKZ009-010-014-262300-
ROGER MILLS OK-WOODWARD OK-ELLIS OK-
512 PM CDT FRI APR 26 2013

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ROGER MILLS...
SOUTHWESTERN WOODWARD AND ELLIS COUNTIES UNTIL 600 PM CDT...

AT 512 PM CDT...STRONG THUNDERSTORMS WERE ALONG A LINE EXTENDING
FROM 10 MILES NORTH OF GAGE TO ARNETT TO 8 MILES NORTH OF DURHAM...
MOVING EAST AT 35 MPH.

HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
WIND GUSTS TO 50 MPH...

LOCATIONS IMPACTED INCLUDE...
WOODWARD...SHATTUCK...ARNETT...GAGE...FARGO...DURHAM...CRAWFORD...
HARMON...ROLL...TANGIER AND CATESBY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.

&&

LAT...LON 3607 10000 3614 9989 3653 9999 3645 9934
      3615 9938 3566 9963 3576 10000
TIME...MOT...LOC 2207Z 277DEG 34KT 3647 9978 3613 9978 3597 9990

MBS

Special weather statement, Apr 26, 5:58 PM CDT, 1 hour 8 minutes before

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Local storm report, Apr 26, 6:11 PM CDT, 55 minutes before

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Special weather statement, Apr 26, 6:23 PM CDT, 43 minutes before

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Local storm report, Apr 26, 6:50 PM CDT, 16 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 26, 7:13 PM CDT	Special Weather Statement	OUN	Canadian, Kingfisher, Logan, Oklahoma	17 min
Apr 26, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Kingfisher, Logan, Oklahoma	59 min
Apr 26, 7:51 PM CDT	Severe Thunderstorm Warning	OUN	Washita	39 min
Apr 26, 8:03 PM CDT	Special Weather Statement	OUN	Custer	42 min
Apr 26, 8:12 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	63 min
Apr 26, 8:26 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	49 min
Apr 26, 8:59 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady	61 min
Apr 26, 9:03 PM CDT	Special Weather Statement	OUN	Canadian	57 min
Apr 26, 9:14 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Oklahoma, Pottawatomie	46 min
Apr 26, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Oklahoma	49 min
Apr 26, 9:43 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain	62 min
Apr 26, 9:48 PM CDT	Areal Flood Advisory	OUN	Oklahoma	3 hr
Apr 26, 9:56 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	34 min
Apr 26, 10:12 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Oklahoma, Pottawatomie	48 min
Apr 26, 10:30 PM CDT	Flash Flood Warning	OUN	Grady	3 hr
Apr 26, 10:30 PM CDT	Special Weather Statement	OUN	Grady	30 min
Apr 26, 10:40 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Murray, Pontotoc	65 min
Apr 26, 10:59 PM CDT	Special Weather Statement	OUN	Hughes, Seminole	31 min
Apr 26, 11:01 PM CDT	Special Weather Statement	OUN	Grady, McClain	29 min
Apr 26, 11:10 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain	50 min
Apr 26, 11:25 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc	35 min
Apr 26, 11:42 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes, Pontotoc, Seminole	63 min
Apr 26, 11:48 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc	42 min
Apr 27, 12:28 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Garvin, Hughes, Murray, Pontotoc	47 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2013 Every severe thunderstorm warning in 2013

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.