Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 506, NWS Norman, OK

May 28, 20155 counties in Oklahoma; Archer County, Clay County, Wichita County, Texas

NWS Norman, OK issued this severe thunderstorm warning at May 28, 2015, 6:17 PM CDT for 5 counties in Oklahoma; Archer County, Clay County, Wichita County, Texas. It was in force for 58 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 28, 2015, 6:17 PM CDT (23:17 UTC)
Expired: May 28, 2015, 7:15 PM CDT
In force: 58 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.25 in
Wind: 80.0 mph

Counties Comanche County, OK, Cotton County, OK, Jefferson County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Clay County, TX, Wichita County, TX

The radar

The Altus AFB radar (KFDR), 59 km from the middle of the area, began a volume at 23:18 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 28, 3:26 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.3 hours before the alert went out and 148 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: 39 J/kg
Mixed-layer CIN: -204 J/kg
Mixed-layer LCL: 1310 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 121 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 28, 6:09 PM CDT, 8 minutes earlier.

Area forecast discussion, May 28, 6:09 PM CDT, 8 minutes before

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Hazardous weather outlook, May 28, 5:27 PM CDT, 50 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NORMAN OK
527 PM CDT THU MAY 28 2015

OKZ004>048-050>052-TXZ083>090-292230-
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-
527 PM CDT THU MAY 28 2015

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

.DAY ONE...THROUGH TONIGHT...

.THUNDERSTORMS...
THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS WESTERN
NORTH TEXAS THIS EVENING. A SLIGHT RISK IS NORTH AND EAST OF THE
ENHANCED RISK AREA.

LOCATION...
THE ENHANCED RISK IS ACROSS ALL OF WESTERN NORTH TEXAS. THE
SLIGHT RISK AREA IS GENERALLY ALONG AND WEST OF A LINE FROM PONCA
CITY TO SEMINOLE TO DURANT.

TIMING...
THROUGH MIDNIGHT...

IMPACTS...
LARGE HAIL UP TO TENNIS BALLS...
DAMAGING WINDS UP TO 70 MPH...
LOCALLY HEAVY RAINFALL WHICH MAY CAUSE FLASH FLOODING...

THERE IS ALSO A LOW POTENTIAL FOR TORNADOES ACROSS SOUTHWESTERN
OKLAHOMA AND WESTERN NORTH TEXAS.

DISCUSSION...
SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE TO DEVELOP
ACROSS PORTIONS OF WESTERN NORTH TEXAS AND SOUTHWESTERN OKLAHOMA
THIS EVENING. THESE STORMS CONTINUE TO SHOW SIGNS THEY MAY
EVENTUALLY DEVELOP INTO ONE OR MORE STORM COMPLEXES THAT MOVE
ACROSS THE AREA.

INSTABILITY IS SUFFICIENT FOR SEVERE STORMS TO DEVELOP PRODUCING
LARGE HAIL AND DAMAGING WINDS. SEVERAL OUTFLOW BOUNDARIES ARE
DRAPED ACROSS THE AREA. ANY STORMS NEAR THESE BOUNDARIES COULD
ALSO HAVE THE POTENTIAL OF PRODUCING A FEW TORNADOES IN WESTERN
OKLAHOMA AND WESTERN NORTH TEXAS.

THE SEVERE POTENTIAL IS EXPECTED TO DECREASE AFTER MIDNIGHT.

LOCALLY HEAVY RAINFALL THROUGH TONIGHT MAY EXACERBATE FLASH FLOOD
AND FLOOD CONCERNS.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS
THE RISK AREAS SHOULD BE READY FOR SEVERE WEATHER OPERATIONS
THROUGH THE EVENING.

.FLOODING...
NUMEROUS STREAMS... CREEKS... AND RIVERS REMAIN IN FLOOD ACROSS
PARTS OF OKLAHOMA AND WESTERN NORTH TEXAS. A FLASH FLOOD WATCH
REMAINS IN EFFECT TODAY FOR ALL OF OKLAHOMA AND NORTH TEXAS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

.FLOODING...
NUMEROUS STREAMS...CREEKS...AND RIVERS WILL REMAIN IN FLOOD
ACROSS PARTS OF OKLAHOMA AND WESTERN NORTH TEXAS THROUGH THE
WEEKEND.

.THUNDERSTORMS...
ADDITIONAL STRONG TO SEVERE THUNDERSTORMS WITH HEAVY RAINFALL WILL
OCCUR FRIDAY INTO SATURDAY. STORM CHANCES WILL DECREASE
SIGNIFICANTLY SUNDAY THROUGH THE MIDDLE OF NEXT WEEK.

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

KURTZ

In the hours before

Local storm report, May 28, 5:51 PM CDT, 26 minutes before

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Local storm report, May 28, 5:56 PM CDT, 21 minutes before

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Special weather statement, May 28, 6:03 PM CDT, 14 minutes before

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Local storm report, May 28, 6:04 PM CDT, 13 minutes before

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Local storm report, May 28, 6:07 PM CDT, 10 minutes before

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Local storm report, May 28, 6:11 PM CDT, 6 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 27, 8:21 PM CDT	Special Weather Statement	OUN	Roger Mills	39 min
May 27, 8:31 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills	44 min
May 27, 8:57 PM CDT	Tornado Warning	OUN	Ellis, Roger Mills	33 min
May 27, 9:30 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Ellis, Roger Mills	45 min
May 27, 9:58 PM CDT	Areal Flood Advisory	OUN	Custer, Dewey, Ellis, Roger Mills, Woodward	3 hr
May 27, 10:16 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Roger Mills	25 min
May 27, 11:32 PM CDT	Special Weather Statement	OUN	Alfalfa, Major	43 min
May 27, 11:34 PM CDT	Special Weather Statement	OUN	Roger Mills	26 min
May 28, 12:05 AM CDT	Special Weather Statement	OUN	Alfalfa	25 min
May 28, 12:31 AM CDT	Special Weather Statement	OUN	Garfield, Grant	29 min
May 28, 12:37 AM CDT	Special Weather Statement	OUN	Beckham, Greer, Harmon	38 min
May 28, 12:40 AM CDT	Special Weather Statement	OUN	Alfalfa	35 min
May 28, 12:48 AM CDT	Special Weather Statement	OUN	Blaine	27 min
May 28, 1:01 AM CDT	Special Weather Statement	OUN	Kay	29 min
May 28, 1:10 AM CDT	Special Weather Statement	OUN	Blaine	50 min
May 28, 1:14 AM CDT	Special Weather Statement	OUN	Greer, Harmon	31 min
May 28, 1:38 AM CDT	Special Weather Statement	OUN	Kay	67 min
May 28, 1:41 AM CDT	Areal Flood Advisory	OUN	Grant, Kay	5 hr
May 28, 1:49 AM CDT	Special Weather Statement	OUN	Greer, Harmon, Jackson, Kiowa	26 min
May 28, 1:53 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	36 min
May 28, 1:58 AM CDT	Areal Flood Advisory	OUN	Blaine	5 hr
May 28, 2:39 AM CDT	Special Weather Statement	OUN	Major	66 min
May 28, 2:48 AM CDT	Special Weather Statement	OUN	Beckham, Greer, Harmon, Jackson, Kiowa, Tillman and 1 more	27 min
May 28, 3:07 AM CDT	Areal Flood Advisory	OUN	Alfalfa, Major, Woods	5 hr
May 28, 3:14 AM CDT	River Flood Warning	OUN	Kingfisher, Logan	56 hr
May 28, 3:23 AM CDT	Special Weather Statement	OUN	Caddo, Comanche, Cotton, Grady, Jackson, Kiowa and 1 more	37 min
May 28, 3:40 AM CDT	Special Weather Statement	OUN	Garfield	35 min
May 28, 4:10 AM CDT	Special Weather Statement	OUN	Caddo, Comanche, Cotton, Grady	35 min
May 28, 4:43 AM CDT	Special Weather Statement	OUN	Canadian, Cleveland, Comanche, Cotton, Grady, Jefferson and 3 more	62 min
May 28, 4:48 AM CDT	Special Weather Statement	OUN	Kingfisher	27 min
May 28, 4:56 AM CDT	Areal Flood Advisory	OUN	Canadian	3 hr
May 28, 5:21 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	24 min
May 28, 5:26 AM CDT	Flash Flood Warning	OUN	Canadian	3 hr
May 28, 5:41 AM CDT	Special Weather Statement	OUN	Carter, Cleveland, Garvin, Love, McClain, Murray and 2 more	64 min
May 28, 5:46 AM CDT	Areal Flood Advisory	OUN	Cleveland, Oklahoma	3 hr
May 28, 6:16 AM CDT	Tornado Warning	OUN	Cleveland, Pottawatomie	9 min
May 28, 6:24 AM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie	24 min
May 28, 6:50 AM CDT	Special Weather Statement	OUN	Carter, Johnston, Lincoln, Love, Marshall, Murray and 3 more	25 min
May 28, 7:07 AM CDT	Areal Flood Advisory	OUN	Carter, Cleveland, Coal, Garvin, Hughes, Jefferson and 8 more	3 hr
May 28, 7:15 AM CDT	Special Weather Statement	OUN	Coal, Hughes, Johnston, Marshall, Pontotoc	60 min
May 28, 8:09 AM CDT	Special Weather Statement	OUN	Atoka, Bryan, Coal	51 min
May 28, 8:35 AM CDT	Areal Flood Advisory	OUN	Atoka, Bryan, Coal, Johnston, Marshall	3 hr
May 28, 2:33 PM CDT	Special Weather Statement	OUN	Stephens	27 min
May 28, 2:46 PM CDT	River Flood Warning	OUN	Garvin	38 hr
May 28, 2:52 PM CDT	Special Weather Statement	OUN	Comanche	23 min
May 28, 2:58 PM CDT	River Flood Warning	OUN	Jackson, Kiowa, Tillman	67 hr
May 28, 2:59 PM CDT	Severe Thunderstorm Warning	OUN	Grady, Stephens	46 min
May 28, 3:15 PM CDT	River Flood Warning	OUN	Cotton	3 days
May 28, 3:17 PM CDT	Special Weather Statement	OUN	Comanche	28 min
May 28, 3:23 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	52 min
May 28, 3:35 PM CDT	Special Weather Statement	OUN	Cleveland	25 min
May 28, 3:41 PM CDT	Areal Flood Advisory	OUN	Caddo, Comanche, Grady, McClain, Stephens	3 hr
May 28, 3:43 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	32 min
May 28, 4:14 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady, McClain	33 min
May 28, 4:20 PM CDT	Flash Flood Warning	OUN	Comanche	3 hr
May 28, 4:24 PM CDT	Special Weather Statement	OUN	Comanche	36 min
May 28, 4:29 PM CDT	Flash Flood Warning	OUN	Comanche, Grady	3 hr
May 28, 4:34 PM CDT	Special Weather Statement	OUN	Cleveland	26 min
May 28, 4:59 PM CDT	Special Weather Statement	OUN	Comanche	31 min
May 28, 5:12 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	21 min
May 28, 5:40 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	50 min
May 28, 5:58 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	47 min
May 28, 6:03 PM CDT	Special Weather Statement	OUN	Comanche	27 min
May 28, 6:32 PM CDT	Special Weather Statement	OUN	Stephens	28 min
May 28, 6:44 PM CDT	Areal Flood Advisory	OUN	Comanche, Cotton, Tillman	2 hr
May 28, 3:01 AM CDT	Special Weather Statement	OUN	Foard	44 min
May 28, 4:44 AM CDT	River Flood Warning	OUN	Wichita, Wilbarger	7 days
May 28, 1:38 PM CDT	Special Weather Statement	OUN	Wilbarger	22 min
May 28, 1:49 PM CDT	Severe Thunderstorm Warning	OUN	Wilbarger	22 min
May 28, 2:17 PM CDT	Special Weather Statement	OUN	Foard	28 min
May 28, 2:29 PM CDT	Severe Thunderstorm Warning	OUN	Foard	61 min
May 28, 3:06 PM CDT	Tornado Warning	OUN	Foard, Hardeman	24 min
May 28, 3:28 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	47 min
May 28, 3:34 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	41 min
May 28, 4:12 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Hardeman, Knox, Wilbarger	63 min
May 28, 4:36 PM CDT	Areal Flood Advisory	OUN	Baylor, Foard, Hardeman, Knox, Wilbarger	3 hr
May 28, 5:00 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor, Wichita, Wilbarger	45 min
May 28, 5:59 PM CDT	Areal Flood Advisory	OUN	Archer, Wichita	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2015 Severe Thunderstorm Warnings in Texas, 2015 Every 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.