Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 784, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 11, 2017, 1:43 AM CDT for Alfalfa County, Grant County, Oklahoma. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2017, 1:43 AM CDT (06:43 UTC)
- Expired
- Aug 11, 2017, 2:30 AM CDT
- In force
- 47 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Alfalfa County, OK, Grant County, OK
The radar
The Vance AFB radar (KVNX), 8 km from the middle of the area, began a volume at 06:47 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
Dodge City, (KDDC), launched 00:00Z, 6.7 hours before the alert went out and 187 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
- 585 J/kg
- Mixed-layer CIN
- -84 J/kg
- Mixed-layer LCL
- 1169 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 200 m²/s²
- 0-3 km storm-relative helicity
- 401 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 8.7
The text
As transmitted.
626 WUUS54 KOUN 110643 SVROUN OKC003-053-110730- /O.NEW.KOUN.SV.W.0784.170811T0643Z-170811T0730Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Norman OK 143 AM CDT FRI AUG 11 2017 The National Weather Service in Norman has issued a * Severe Thunderstorm Warning for... Northeastern Alfalfa County in northwestern Oklahoma... Western Grant County in northern Oklahoma... * Until 230 AM CDT * At 143 AM CDT, a severe thunderstorm was located near Great Salt Plains Lake, moving east at 30 mph. HAZARD...60 to 65 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Cherokee, Wakita, Nash, Amorita, Byron, Ingersoll, Great Salt Plains Lake and Driftwood. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3676 9845 3696 9837 3691 9779 3660 9783 TIME...MOT...LOC 0643Z 289DEG 28KT 3679 9821 HAIL...0.75IN WIND...60MPH $$ SIX
1 follow-up statement
551 WWUS54 KOUN 110714 SVSOUN Severe Weather Statement National Weather Service Norman OK 214 AM CDT FRI AUG 11 2017 OKC003-053-110730- /O.CON.KOUN.SV.W.0784.000000T0000Z-170811T0730Z/ Alfalfa OK-Grant OK- 214 AM CDT FRI AUG 11 2017 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT FOR NORTHEASTERN ALFALFA AND WESTERN GRANT COUNTIES... At 214 AM CDT, a severe thunderstorm was located 7 miles west of Pond Creek, moving southeast at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Cherokee, Wakita, Nash, Amorita, Byron, Ingersoll, Great Salt Plains Lake and Driftwood. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 3676 9845 3696 9837 3691 9779 3660 9783 TIME...MOT...LOC 0714Z 298DEG 28KT 3670 9793 HAIL...<.75IN WIND...60MPH $$ SIX
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 7:03 PM CDT | Special Weather Statement | OUN | Kay | 27 min |
| Aug 10, 7:10 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 50 min |
| Aug 10, 7:23 PM CDT | Severe Thunderstorm Warning | OUN | McClain | 32 min |
| Aug 10, 7:31 PM CDT | Special Weather Statement | OUN | Kay | 29 min |
| Aug 10, 9:13 PM CDT | Special Weather Statement | OUN | Greer | 32 min |
| Aug 10, 9:19 PM CDT | Special Weather Statement | OUN | Roger Mills | 26 min |
| Aug 10, 10:00 PM CDT | Special Weather Statement | OUN | Beckham | 45 min |
| Aug 10, 10:14 PM CDT | Special Weather Statement | OUN | Beckham | 46 min |
| Aug 10, 10:44 PM CDT | Special Weather Statement | OUN | Custer | 46 min |
| Aug 10, 10:45 PM CDT | Special Weather Statement | OUN | Beckham | 45 min |
| Aug 10, 10:51 PM CDT | Special Weather Statement | OUN | Harper | 39 min |
| Aug 10, 11:31 PM CDT | Special Weather Statement | OUN | Custer | 29 min |
| Aug 10, 11:39 PM CDT | Special Weather Statement | OUN | Ellis | 36 min |
| Aug 10, 11:52 PM CDT | Areal Flood Advisory | OUN | Ellis, Harper, Woodward | 3 hr |
| Aug 10, 11:53 PM CDT | Areal Flood Advisory | OUN | Ellis, Harper, Woodward | 3 hr |
| Aug 10, 11:53 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Custer, Roger Mills, Washita | 52 min |
| Aug 11, 12:08 AM CDT | Areal Flood Advisory | OUN | Beckham, Roger Mills | 3 hr |
| Aug 11, 12:25 AM CDT | Special Weather Statement | OUN | Roger Mills | 35 min |
| Aug 11, 12:30 AM CDT | Special Weather Statement | OUN | Woodward | 30 min |
| Aug 11, 12:57 AM CDT | Areal Flood Advisory | OUN | Woods | 3 hr |
| Aug 11, 1:03 AM CDT | Special Weather Statement | OUN | Alfalfa | 27 min |
| Aug 11, 1:13 AM CDT | Flash Flood Warning | OUN | Beckham, Custer, Roger Mills, Washita | 3 hr |
| Aug 11, 1:18 AM CDT | Special Weather Statement | OUN | Beckham | 27 min |
| Aug 11, 1:22 AM CDT | Flood Watch | OUN | Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 42 more | 54 hr |
| Aug 11, 1:26 AM CDT | Areal Flood Advisory | OUN | Blaine | 3 hr |
| Aug 11, 1:31 AM CDT | Special Weather Statement | OUN | Alfalfa | 29 min |
| Aug 11, 1:48 AM CDT | Flash Flood Warning | OUN | Alfalfa, Grant, Woods, Woodward | 3 hr |
| Aug 11, 2:29 AM CDT | Areal Flood Advisory | OUN | Blaine, Caddo, Canadian, Custer, Washita | 3 hr |
| Aug 11, 2:44 AM CDT | Flash Flood Warning | OUN | Caddo, Canadian, Grady | 4 hr |
| Aug 11, 2:46 AM CDT | Flash Flood Warning | OUN | Grant, Kay | 3 hr |
| Aug 11, 3:25 AM CDT | Special Weather Statement | OUN | Grady | 35 min |
| Aug 11, 3:49 AM CDT | Special Weather Statement | OUN | Garvin | 26 min |
| Aug 11, 4:06 AM CDT | Areal Flood Advisory | OUN | Canadian, Cleveland, Grady, McClain | 3 hr |
| Aug 11, 4:32 AM CDT | Special Weather Statement | OUN | Carter, Murray, Pontotoc, Seminole | 28 min |
| Aug 11, 6:00 AM CDT | Areal Flood Advisory | OUN | Comanche, Cotton, Garvin, Grady, Stephens | 3 hr |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2017Every severe thunderstorm warning in 2017
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.