Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 95, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Apr 8, 2015, 8:11 PM CDT for 4 counties in 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
- Apr 8, 2015, 8:11 PM CDT (01:11 UTC)
- Expired
- Apr 8, 2015, 9:00 PM CDT
- In force
- 49 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Tornado
- Possible
- Hail
- 2.75 in
- Wind
- 60.0 mph
Counties Beckham County, OK, Custer County, OK, Dewey County, OK, Roger Mills County, OK
The radar
The Altus AFB radar (KFDR), 147 km from the middle of the area, began a volume at 01:13 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 8, 3:37 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 1.2 hours before the alert went out and 183 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.
- Mixed-layer CAPE
- 427 J/kg
- Mixed-layer CIN
- -258 J/kg
- Mixed-layer LCL
- 1139 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 251 m²/s²
- 0-3 km storm-relative helicity
- 302 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
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 8, 6:20 PM CDT, 1 hour 51 minutes earlier.
Area forecast discussion, Apr 8, 6:20 PM CDT, 1 hour 51 minutes before
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</html>Hazardous weather outlook, Apr 8, 7:45 PM CDT, 26 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE NORMAN OK 745 PM CDT WED APR 8 2015 OKZ004>048-050>052-TXZ083>090-091015- 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- 745 PM CDT WED APR 8 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN... WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS. .DAY ONE...TONIGHT... .THUNDERSTORMS... THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING ACROSS MUCH OF NORTHERN...WESTERN AND CENTRAL OKLAHOMA AND NORTH TEXAS AN ISOLATED TORNADO REMAINS POSSIBLE. LOCATION... THE SLIGHT RISK COVERS ALL OF WESTERN NORTH TEXAS AND AREAS TO THE WEST OF A LINE FROM HOLDENVILLE TO ARDMORE. TIMING... 8 PM TO MIDNIGHT. IMPACTS... HAIL TO TENNIS BALL SIZE...WIND GUSTS TO 70 MPH AND AN ISOLATED TORNADO. DISCUSSION... A STRONG CAPPING INVERSION HAS INHIBITED DEVELOPMENT ACROSS MUCH OF THE AREA TODAY. ISOLATED SEVERE THUNDERSTORMS WILL REMAIN POSSIBLE THIS EVENING ACROSS THE SLIGHT RISK AREA. THE BEST CHANCE WILL BE ACROSS WESTERN AND SOUTHWESTERN OKLAHOMA INTO WESTERN NORTH TEXAS. STORM INTENSITY IS EXPECTED TO DIMINISH AROUND MIDNIGHT. .SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL SHOULD REMAIN PREPARED FOR SEVERE WEATHER OPERATIONS THIS EVENING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY... A COLD FRONT WILL MOVE INTO SOUTHEAST OKLAHOMA THURSDAY AFTERNOON WITH FAVORABLE MOISTURE AND UPPER LEVEL SUPPORT FOR THUNDERSTORMS. THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS EAST OF DURANT AND ATOKA. A CHANCE OF THUNDERSTORMS CONTINUES UNTIL TUESDAY. 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, Apr 8, 7:01 PM CDT, 1 hour 10 minutes before
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</html>Local storm report, Apr 8, 7:16 PM CDT, 55 minutes before
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</html>Special weather statement, Apr 8, 7:38 PM CDT, 33 minutes before
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</html>Local storm report, Apr 8, 7:43 PM CDT, 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
743 PM CDT WED APR 08 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0738 PM HAIL 10 N TEXOLA 35.36N 99.99W
04/08/2015 E1.25 INCH BECKHAM OK TRAINED SPOTTER
&&
DWLocal storm report, Apr 8, 7:55 PM CDT, 16 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
755 PM CDT WED APR 08 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0747 PM HAIL 1 N SWEETWATER 35.44N 99.91W
04/08/2015 E1.00 INCH ROGER MILLS OK PUBLIC
0747 PM HAIL 10 N TEXOLA 35.36N 99.99W
04/08/2015 E2.00 INCH BECKHAM OK TRAINED SPOTTER
&&
DWThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 7:01 PM CDT | Special Weather Statement | OUN | Beckham, Roger Mills | 44 min |
| Apr 8, 7:28 PM CDT | Special Weather Statement | OUN | Harmon | 32 min |
| Apr 8, 7:38 PM CDT | Special Weather Statement | OUN | Roger Mills | 37 min |
| Apr 8, 7:41 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Roger Mills | 34 min |
| Apr 8, 8:44 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Roger Mills | 31 min |
| Apr 8, 8:53 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Blaine, Custer, Dewey, Roger Mills | 52 min |
| Apr 8, 8:58 PM CDT | Tornado Warning | OUN | Custer, Dewey | 47 min |
| Apr 8, 9:42 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Custer, Dewey | 48 min |
| Apr 8, 10:45 PM CDT | Special Weather Statement | OUN | Comanche, Greer, Jackson, Kiowa, Tillman | 45 min |
| Apr 8, 11:28 PM CDT | Special Weather Statement | OUN | Caddo, Canadian, Cleveland, Garvin, Grady, McClain and 1 more | 62 min |
| Apr 9, 12:23 AM CDT | Special Weather Statement | OUN | Noble | 37 min |
| Apr 9, 5:03 PM CDT | Special Weather Statement | OUN | Atoka | 27 min |
| Apr 9, 5:33 PM CDT | Special Weather Statement | OUN | Atoka | 27 min |
| Apr 8, 9:04 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Foard, Hardeman, Knox, Wilbarger | 56 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 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.