Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 558, NWS Norman, OK

July 4, 2015Cotton County, Tillman County, Oklahoma; Wichita County, Texas

NWS Norman, OK issued this severe thunderstorm warning at Jul 4, 2015, 6:53 PM CDT for Cotton County, Tillman County, Oklahoma; Wichita County, Texas. It was in force for 52 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
Jul 4, 2015, 6:53 PM CDT (23:53 UTC)
Expired
Jul 4, 2015, 7:45 PM CDT
In force
52 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Cotton County, OK, Tillman County, OK, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 33 km from the middle of the area, began a volume at 23:57 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.9 hours before the alert went out and 161 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 12:00Z on 2015-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 755 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 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 12:00Z on 2015-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.1939Sfc1 km3 km6 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
755 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
1229 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
112 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 Jul 4, 6:27 PM CDT, 26 minutes earlier.

Area forecast discussion, Jul 4, 6:27 PM CDT, 26 minutes before
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Hazardous weather outlook, Jul 4, 11:55 AM CDT, 6 hours 58 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1155 AM CDT SAT JUL 4 2015

OKZ004>048-050>052-TXZ083>090-051015-
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-
1155 AM CDT SAT JUL 4 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN...
WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH
TEXAS.

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

.THUNDERSTORMS...
A FEW SCATTERED THUNDERSTORMS WILL OCCUR THIS AFTERNOON AND
EVENING...ESPECIALLY FROM NORTHWEST OKLAHOMA INTO SOUTH CENTRAL
AND SOUTHEAST OKLAHOMA.

THE STRONGEST STORMS WILL BE CAPABLE OF PRODUCING...
STRONG WIND GUSTS OVER 60 MPH...
SMALL HAIL...
VERY HEAVY RAIN WITH MINOR FLOODING...

THUNDERSTORM COVERAGE WILL LIKELY DECREASE BY LATE EVENING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

.THUNDERSTORMS...
THUNDERSTORMS WILL REMAIN POSSIBLE SUNDAY THROUGH THURSDAY.
THE BEST CHANCE OF WIDESPREAD SHOWERS AND THUNDERSTORMS WILL BE
MONDAY AND TUESDAY...AS A COLD FRONT MOVES SLOWLY ACROSS
OKLAHOMA. THE STRONGEST STORMS MONDAY AND TUESDAY WILL BE CAPABLE
OF PRODUCING STRONG WINDS AND LOCALLY HEAVY RAINFALL. SOME
FLOODING MAY OCCUR...ESPECIALLY ACROSS NORTHERN AND WESTERN
OKLAHOMA.

GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW
OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK.

In the hours before

Special weather statement, Jul 4, 6:17 PM CDT, 36 minutes before
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Local storm report, Jul 4, 6:19 PM CDT, 34 minutes before
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Special weather statement, Jul 4, 6:30 PM CDT, 23 minutes before
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Local storm report, Jul 4, 6:33 PM CDT, 20 minutes before
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Special weather statement, Jul 4, 6:41 PM CDT, 12 minutes before
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Special weather statement, Jul 4, 6:51 PM CDT, 2 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 7:10 PM CDTSpecial Weather StatementOUNKiowa35 min
Jul 3, 7:36 PM CDTSpecial Weather StatementOUNAtoka24 min
Jul 3, 7:41 PM CDTSpecial Weather StatementOUNKiowa34 min
Jul 3, 7:58 PM CDTSevere Thunderstorm WarningOUNKiowa, Tillman47 min
Jul 3, 8:00 PM CDTSpecial Weather StatementOUNCoal30 min
Jul 3, 8:34 PM CDTSpecial Weather StatementOUNStephens26 min
Jul 3, 9:56 PM CDTSpecial Weather StatementOUNHughes34 min
Jul 3, 9:59 PM CDTSevere Thunderstorm WarningOUNHughes31 min
Jul 4, 3:53 AM CDTSpecial Weather StatementOUNGarvin37 min
Jul 4, 5:26 AM CDTSpecial Weather StatementOUNMajor34 min
Jul 4, 2:26 PM CDTSpecial Weather StatementOUNBlaine34 min
Jul 4, 2:59 PM CDTSevere Thunderstorm WarningOUNBlaine, Dewey30 min
Jul 4, 3:28 PM CDTSpecial Weather StatementOUNCaddo32 min
Jul 4, 3:47 PM CDTSpecial Weather StatementOUNBlaine28 min
Jul 4, 4:01 PM CDTAreal Flood AdvisoryOUNBlaine, Canadian, Kingfisher3 hr
Jul 4, 4:11 PM CDTSpecial Weather StatementOUNKingfisher34 min
Jul 4, 4:17 PM CDTSevere Thunderstorm WarningOUNCanadian, Kingfisher33 min
Jul 4, 4:32 PM CDTSevere Thunderstorm WarningOUNKingfisher43 min
Jul 4, 4:36 PM CDTSpecial Weather StatementOUNGrady24 min
Jul 4, 4:54 PM CDTSpecial Weather StatementOUNCanadian36 min
Jul 4, 5:01 PM CDTSevere Thunderstorm WarningOUNKingfisher, Logan30 min
Jul 4, 5:28 PM CDTSpecial Weather StatementOUNCaddo32 min
Jul 4, 5:36 PM CDTSevere Thunderstorm WarningOUNJohnston25 min
Jul 4, 5:59 PM CDTSpecial Weather StatementOUNCotton, Tillman31 min
Jul 4, 6:14 PM CDTSpecial Weather StatementOUNGrady31 min
Jul 4, 6:17 PM CDTSpecial Weather StatementOUNAtoka28 min
Jul 4, 6:30 PM CDTSpecial Weather StatementOUNCotton30 min
Jul 4, 6:41 PM CDTSpecial Weather StatementOUNCleveland49 min
Jul 4, 6:51 PM CDTSpecial Weather StatementOUNBryan39 min
Jul 3, 7:13 PM CDTSevere Thunderstorm WarningOUNBaylor, Foard, Hardeman, Wilbarger47 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015Severe Thunderstorm Warnings in Texas, 2015Every severe thunderstorm warning in 2015

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.