Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 178, NWS Norman, OK

April 26, 20135 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 26, 2013, 11:42 PM CDT for 5 counties in Oklahoma. It was in force for 63 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, 11:42 PM CDT (04:42 UTC)
Expired
Apr 27, 2013, 12:45 AM CDT
In force
63 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Atoka County, OK, Coal County, OK, Hughes County, OK, Pontotoc County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 102 km from the middle of the area, began a volume at 04:42 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
Apr 26, 9:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.7 hours before the alert went out and 105 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 00:00Z on 2013-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 13 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 00:00Z on 2013-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.19395878Sfc1 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
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, 9:01 PM CDT, 2 hours 41 minutes earlier.

Area forecast discussion, Apr 26, 9:01 PM CDT, 2 hours 41 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
901 PM CDT FRI APR 26 2013

.DISCUSSION...
UPDATED HOURLY TEMPERATURES/DEW POINTS EARLIER THIS EVENING TO
ACCOUNT FOR THE POSITION OF THE SURFACE FRONT. IT APPEARS THAT ALL
OTHER FEATURES OF THE FORECAST WERE/ARE IN GOOD SHAPE. NO
ADDITIONAL UPDATES ARE PLANNED...EXCEPT TO THE ZONE FORECAST TO
UPDATE OUTDATED WORDING...AS NEEDED.

&&

.PREV DISCUSSION... /ISSUED 639 PM CDT FRI APR 26 2013/

AVIATION...
27/00Z TAFS...IFR CIGS/VIS EXPECTED TO PERSIST THROUGH 12Z AT
KPNC WITH INTERMITTENT -DZ OR -RA. MVFR AND TEMPO IFR POSSIBLE
WITH LINE OF STORMS THAT WILL MOVE SOUTHEAST THROUGH
KCSM/KHBR/KOKC/KOUN BETWEEN 01Z AND 06Z. MODELS CONSISTENT ON
BRINGING IN MVFR CIGS AFTER FROPA OVERNIGHT THROUGH TOMORROW
MORNING AND WILL KEEP THAT GOING ACROSS NORTHERN AND CENTRAL
OKLAHOMA. WINDS WILL BE FAIRLY GUSTY BEHIND FRONT THIS EVENING
WITH MOST NORTHERLY WINDS TOMORROW AVERAGING AROUND 15 KTS.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  53  72  51  79 /  70  10   0   0
HOBART OK         50  74  51  80 /  40   0   0  10
WICHITA FALLS TX  54  77  52  83 /  30   0  10   0
GAGE OK           46  74  49  82 /  20   0   0  10
PONCA CITY OK     51  71  49  80 /  50  10   0   0
DURANT OK         59  75  54  81 /  60  20   0   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.
&&

23/11
Hazardous weather outlook, Apr 26, 4:36 PM CDT, 7 hours 6 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

Local storm report, Apr 26, 10:52 PM CDT, 50 minutes before
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Local storm report, Apr 26, 10:53 PM CDT, 49 minutes before
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Special weather statement, Apr 26, 10:59 PM CDT, 43 minutes before
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Special weather statement, Apr 26, 11:01 PM CDT, 41 minutes before
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Local storm report, Apr 26, 11:29 PM CDT, 13 minutes before
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Local storm report, Apr 26, 11:41 PM CDT, 1 minute before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 7:06 PM CDTSevere Thunderstorm WarningOUNBeckham, Custer, Roger Mills, Washita54 min
Apr 26, 7:13 PM CDTSpecial Weather StatementOUNCanadian, Kingfisher, Logan, Oklahoma17 min
Apr 26, 7:31 PM CDTSevere Thunderstorm WarningOUNBlaine, Canadian, Kingfisher, Logan, Oklahoma59 min
Apr 26, 7:51 PM CDTSevere Thunderstorm WarningOUNWashita39 min
Apr 26, 8:03 PM CDTSpecial Weather StatementOUNCuster42 min
Apr 26, 8:12 PM CDTSevere Thunderstorm WarningOUNCaddo, Kiowa, Washita63 min
Apr 26, 8:26 PM CDTSevere Thunderstorm WarningOUNCanadian, Oklahoma49 min
Apr 26, 8:59 PM CDTSevere Thunderstorm WarningOUNCaddo, Grady61 min
Apr 26, 9:03 PM CDTSpecial Weather StatementOUNCanadian57 min
Apr 26, 9:14 PM CDTSevere Thunderstorm WarningOUNLincoln, Oklahoma, Pottawatomie46 min
Apr 26, 9:26 PM CDTSevere Thunderstorm WarningOUNCanadian, Cleveland, Grady, Oklahoma49 min
Apr 26, 9:43 PM CDTSevere Thunderstorm WarningOUNGarvin, Grady, McClain62 min
Apr 26, 9:48 PM CDTAreal Flood AdvisoryOUNOklahoma3 hr
Apr 26, 9:56 PM CDTSevere Thunderstorm WarningOUNLincoln34 min
Apr 26, 10:12 PM CDTSevere Thunderstorm WarningOUNCleveland, Oklahoma, Pottawatomie48 min
Apr 26, 10:30 PM CDTFlash Flood WarningOUNGrady3 hr
Apr 26, 10:30 PM CDTSpecial Weather StatementOUNGrady30 min
Apr 26, 10:40 PM CDTSevere Thunderstorm WarningOUNGarvin, McClain, Murray, Pontotoc65 min
Apr 26, 10:59 PM CDTSpecial Weather StatementOUNHughes, Seminole31 min
Apr 26, 11:01 PM CDTSpecial Weather StatementOUNGrady, McClain29 min
Apr 26, 11:10 PM CDTSevere Thunderstorm WarningOUNGarvin, Grady, McClain50 min
Apr 26, 11:25 PM CDTSevere Thunderstorm WarningOUNGarvin, McClain, Pontotoc35 min
Apr 26, 11:48 PM CDTSevere Thunderstorm WarningOUNGarvin, McClain, Pontotoc42 min
Apr 27, 12:28 AM CDTSevere Thunderstorm WarningOUNCoal, Garvin, Hughes, Murray, Pontotoc47 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2013Every 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.