Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 155, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Apr 18, 2015, 6:30 PM CDT for 4 counties in Oklahoma. It was in force for 45 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 18, 2015, 6:30 PM CDT (23:30 UTC)
- Expired
- Apr 18, 2015, 7:15 PM CDT
- In force
- 45 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 60.0 mph
Counties Caddo County, OK, Comanche County, OK, Kiowa County, OK, Washita County, OK
The radar
The Altus AFB radar (KFDR), 76 km from the middle of the area, began a volume at 23:32 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 18, 2:27 PM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 11.5 hours before the alert went out and 121 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1320 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- -8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 18, 6:27 PM CDT, 3 minutes earlier.
Area forecast discussion, Apr 18, 6:27 PM CDT, 3 minutes before
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</html>Hazardous weather outlook, Apr 18, 2:55 PM CDT, 3 hours 35 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE NORMAN OK 255 PM CDT SAT APR 18 2015 OKZ004>048-050>052-TXZ083>090-191800- 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- 255 PM CDT SAT APR 18 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... THERE IS AN ENHANCED RISK OF SEVERE STORMS ACROSS MUCH OF OKLAHOMA AND WESTERN NORTH TEXAS. LOCATION... THE ENHANCED RISK AREA IS ALONG AND EAST OF A LINE FROM BUFFALO...TO CHEYENNE...TO MANGUM IN OKLAHOMA...TO QUANAH AND BENJAMIN IN WESTERN NORTH TEXAS....AND WEST OF A LINE FROM MEDFORD...TO OKLAHOMA CITY..TO ARDMORE. THE REMAINDER OF OKLAHOMA AND WESTERN NORTH TEXAS IS IN A SLIGHT RISK. TIMING... THROUGH MIDNIGHT. IMPACTS... HAIL UP TO THE SIZE OF GOLF BALLS TO TENNIS BALLS...AND WIND GUSTS UP TO 70 MPH WILL BE THE MAIN CONCERNS. A COUPLE OF TORNADOES MAY ALSO OCCUR ACROSS MAINLY WESTERN OKLAHOMA AND WESTERN NORTH TEXAS LATE THIS AFTERNOON AND EVENING. DISCUSSION... SCATTERED THUNDERSTORMS HAVE DEVELOPED FROM NORTH CENTRAL INTO WESTERN OKLAHOMA EARLY THIS AFTERNOON. THESE STORMS HAVE DEVELOPED IN AN ENVIRONMENT SUPPORTIVE OF RAPID STORM ORGANIZATION...AND HAVE AT TIMES BECOME SEVERE. THESE STORMS ARE LIKELY TO PERSIST OVER THE NEXT SEVERAL HOURS...WITH ADDITIONAL STORMS DEVELOPING OVER WESTERN OKLAHOMA DOWN INTO WESTERN NORTH TEXAS. LARGE HAIL AND DAMAGING WINDS WILL REMAIN THE MAIN CONCERNS WITH THE STRONGEST STORMS...THOUGH A COUPLE OF TORNADOES WILL ALSO BE POSSIBLE WITH STORMS ACROSS WESTERN OKLAHOMA AND WESTERN NORTH TEXAS. STORMS MAY MERGE INTO ONE OR MORE CLUSTERS THIS EVENING AND TONIGHT... AS THEY MOVE TO THE NORTHEAST. THESE AREAS OF STORMS MAY CONTINUE TO POSE A THREAT OF LARGE HAIL AND DAMAGING WINDS...ALONG WITH LOCALLY HEAVY RAINFALL...AS THEY MOVE THROUGH NORTHERN AND CENTRAL OKLAHOMA. .SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE AREA SHOULD PREPARE FOR SEVERE WEATHER OPERATIONS THIS AFTERNOON THROUGH THIS EVENING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... .THUNDERSTORMS... SHOWERS AND THUNDERSTORMS WILL LINGER INTO SUNDAY. SEVERE WEATHER IS UNLIKELY BUT A FEW STORMS MAY BECOME STRONG PRODUCING SMALL HAIL. SHOWER AND THUNDERSTORM CHANCES WILL RETURN MONDAY NIGHT THROUGH FRIDAY...AS A SERIES OF UPPER LEVEL SYSTEMS MOVE ACROSS THE SOUTHERN PLAINS. STRONG TO SEVERE THUNDERSTORM POTENTIAL WILL LIKELY EXIST FOR A TIME FROM MID TO LATE NEXT WEEK. GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK. EM/MBS/AUSTIN
In the hours before
Local storm report, Apr 18, 5:52 PM CDT, 38 minutes before
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</html>The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 18, 12:49 PM CDT | Special Weather Statement | OUN | Alfalfa | 26 min |
| Apr 18, 1:15 PM CDT | Special Weather Statement | OUN | Alfalfa | 30 min |
| Apr 18, 1:58 PM CDT | Special Weather Statement | OUN | Alfalfa, Major | 32 min |
| Apr 18, 2:02 PM CDT | Special Weather Statement | OUN | Harper | 28 min |
| Apr 18, 2:32 PM CDT | Severe Thunderstorm Warning | OUN | Harper | 43 min |
| Apr 18, 2:54 PM CDT | Special Weather Statement | OUN | Woods | 36 min |
| Apr 18, 3:01 PM CDT | Severe Thunderstorm Warning | OUN | Woods, Woodward | 44 min |
| Apr 18, 3:08 PM CDT | Special Weather Statement | OUN | Major | 37 min |
| Apr 18, 3:15 PM CDT | Special Weather Statement | OUN | Caddo | 30 min |
| Apr 18, 3:40 PM CDT | Special Weather Statement | OUN | Blaine | 35 min |
| Apr 18, 3:45 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 45 min |
| Apr 18, 3:47 PM CDT | Special Weather Statement | OUN | Major | 28 min |
| Apr 18, 3:49 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher | 41 min |
| Apr 18, 3:54 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Major, Woods | 51 min |
| Apr 18, 4:28 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 47 min |
| Apr 18, 4:36 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Tillman | 39 min |
| Apr 18, 4:43 PM CDT | Special Weather Statement | OUN | Ellis | 32 min |
| Apr 18, 4:47 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa | 43 min |
| Apr 18, 5:01 PM CDT | Special Weather Statement | OUN | Beckham | 29 min |
| Apr 18, 5:10 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Jackson, Kiowa, Tillman | 50 min |
| Apr 18, 5:13 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer, Roger Mills, Washita | 47 min |
| Apr 18, 5:19 PM CDT | Special Weather Statement | OUN | Garfield | 26 min |
| Apr 18, 5:26 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Grant | 49 min |
| Apr 18, 5:36 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 39 min |
| Apr 18, 5:51 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Kiowa, Washita | 39 min |
| Apr 18, 6:01 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Jefferson, Love | 44 min |
| Apr 18, 6:03 PM CDT | Special Weather Statement | OUN | Custer | 27 min |
| Apr 18, 6:11 PM CDT | Severe Thunderstorm Warning | OUN | Grant | 49 min |
| Apr 18, 6:22 PM CDT | Special Weather Statement | OUN | Grady | 38 min |
| Apr 18, 6:24 PM CDT | Special Weather Statement | OUN | Harper | 36 min |
| Apr 18, 6:35 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Garvin, Murray | 40 min |
| Apr 18, 6:38 PM CDT | Severe Thunderstorm Warning | OUN | Canadian, Cleveland, Grady, McClain, Oklahoma | 52 min |
| Apr 18, 6:44 PM CDT | Severe Thunderstorm Warning | OUN | Jackson, Kiowa, Washita | 31 min |
| Apr 18, 6:45 PM CDT | Severe Thunderstorm Warning | OUN | Harper | 20 min |
| Apr 18, 6:56 PM CDT | Severe Thunderstorm Warning | OUN | Custer, Washita | 19 min |
| Apr 18, 6:59 PM CDT | Special Weather Statement | OUN | Garvin, McClain | 31 min |
| Apr 18, 3:26 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Baylor | 49 min |
| Apr 18, 4:10 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Baylor, Wichita, Wilbarger | 50 min |
| Apr 18, 6:46 PM CDT | Special Weather Statement | OUN | Wichita | 29 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.