Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 675, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 8, 2017, 6:26 PM CDT for McClain County, Oklahoma. It was in force for 20 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 8, 2017, 6:26 PM CDT (23:26 UTC)
- Expired
- Jul 8, 2017, 6:46 PM CDT
- In force
- 20 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County McClain County, OK
The radar
The Norman radar (KTLX), 39 km from the middle of the area, began a volume at 23:30 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, 11.4 hours before the alert went out and 24 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
- 1388 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 1461 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -59 m²/s²
- 0-3 km storm-relative helicity
- 20 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 Jul 8, 2:40 PM CDT, 3 hours 46 minutes earlier.
Area forecast discussion, Jul 8, 2:40 PM CDT, 3 hours 46 minutes before
Area Forecast Discussion National Weather Service Norman OK 240 PM CDT Sat Jul 8 2017 .DISCUSSION... A MCV continues to produce elevated showers NW of OKC this afternoon. Looking at visible imagery and surface observations, it appears this feature will interact with a remnant boundary near the I40 corridor through early this evening. A few of the storms could become severe before sunset (mainly wind threat) near and south of OKC where heating hasn't been as inhibited by cirrostratus. Most of this activity should wane as it moves SE after dark. Additional chances will return late tonight through early Sunday morning, mainly over southern OK, as a weak mid level shortwave trough progresses southward. Isolated, diurnal development will then be possible along and south of I40 during the afternoon and evening Sunday. Rain chances will likely drop significantly by Mon as heights increase with an expanding upper ridge from the west. A few showers and storms may be possible on its southern/SE periphery Tue as a mid to upper trough slides westward over central TX. Otherwise, expect a drying trend with regards to precip through most of the week as the upper ridge expands over the central CONUS. && .PRELIMINARY POINT TEMPS/POPS... Oklahoma City OK 72 94 73 96 / 20 20 10 10 Hobart OK 73 98 74 97 / 20 20 10 0 Wichita Falls TX 75 98 74 97 / 20 20 20 10 Gage OK 69 98 72 100 / 20 10 10 0 Ponca City OK 72 95 73 95 / 20 10 10 0 Durant OK 74 91 73 94 / 30 30 20 20 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...None. TX...None. && 25/03
Hazardous weather outlook, Jul 8, 3:27 PM CDT, 2 hours 59 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 327 PM CDT Sat Jul 8 2017 OKZ004>048-050>052-TXZ083>090-092030- 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- 327 PM CDT Sat Jul 8 2017 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Through Tonight... .Thunderstorms... Scattered thunderstorms will continue to develop across portions of central and southern Oklahoma, and north Texas through this evening. Some of these storms could become strong or severe with hail up to the size of golf balls and wind gusts to 70 mph. Additional storms could move into parts of northern Oklahoma overnight into early Sunday. A few of these storms may become strong to severe with hail up to the size of quarters and wind gusts to 60 mph. In addition to the potential for severe storms, localized heavy rain that could lead to flooding will also be possible, mainly across central and southeastern Oklahoma. .DAYS TWO THROUGH SEVEN...Sunday through Friday... .Thunderstorms... There is a chance of thunderstorms continuing on Sunday. 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 8, 5:09 PM CDT, 1 hour 17 minutes before
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</html>Special weather statement, Jul 8, 6:11 PM CDT, 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
611 PM CDT SAT JUL 8 2017
OKZ029-030-082345-
Pottawatomie OK-Cleveland OK-
611 PM CDT SAT JUL 8 2017
...SIGNIFICANT WEATHER ADVISORY FOR southwestern Pottawatomie and
east central Cleveland Counties Until 645 PM CDT...
AT 608 PM CDT, a strong thunderstorm was located 4 miles south of
Tribbey, moving north at 5 MPH.
HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...
Frequent cloud to ground lightning...
Locations impacted include...
Asher, Tribbey, St. Louis, Etowah, Macomb and Trousdale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3496 9692 3497 9693 3496 9693 3499 9715
3519 9716 3518 9683
TIME...MOT...LOC 2308Z 187DEG 5KT 3505 9703
MAHALESpecial weather statement, Jul 8, 6:23 PM CDT, 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
623 PM CDT SAT JUL 8 2017
OKZ023-035-038-039-044-090000-
Kiowa OK-Cotton OK-Stephens OK-Caddo OK-Comanche OK-
623 PM CDT SAT JUL 8 2017
...SIGNIFICANT WEATHER ADVISORY FOR northeastern Kiowa...northeastern
Cotton...northwestern Stephens...southwestern Caddo and Comanche
Counties Until 700 PM CDT...
AT 622 PM CDT, strong thunderstorms were along a line extending from
8 miles west of Boone to 10 miles south of Sterling, moving south at
10 MPH.
HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...
Frequent cloud to ground lightning...
Locations impacted include...
Lawton, Elgin, Apache, Fletcher, Sterling, Medicine Park, Meers, Lake
Lawtonka, Boone, Fort Sill, Lake Ellsworth, Hulen, Wichita Mountains
Wildlife Refuge, Mount Scott, Doris Campground and The Visitor
Center.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3459 9848 3477 9878 3503 9879 3483 9811
3444 9811
TIME...MOT...LOC 2322Z 355DEG 9KT 3491 9862 3459 9817
MAHALEThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 7:12 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Grant | 33 min |
| Jul 7, 7:16 PM CDT | Severe Thunderstorm Warning | OUN | Garfield | 44 min |
| Jul 7, 7:26 PM CDT | Special Weather Statement | OUN | Blaine | 49 min |
| Jul 7, 7:37 PM CDT | Areal Flood Advisory | OUN | Garfield | 53 min |
| Jul 7, 7:42 PM CDT | Severe Thunderstorm Warning | OUN | Garfield | 48 min |
| Jul 7, 7:55 PM CDT | Special Weather Statement | OUN | Kingfisher | 35 min |
| Jul 7, 8:04 PM CDT | Severe Thunderstorm Warning | OUN | Garfield, Kingfisher | 41 min |
| Jul 7, 8:07 PM CDT | Areal Flood Warning | OUN | Garfield | 3 hr |
| Jul 7, 9:04 PM CDT | Special Weather Statement | OUN | Blaine, Kingfisher | 26 min |
| Jul 7, 9:08 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Dewey, Major | 37 min |
| Jul 8, 1:27 AM CDT | Special Weather Statement | OUN | Woods | 33 min |
| Jul 8, 2:36 AM CDT | Special Weather Statement | OUN | Grant | 24 min |
| Jul 8, 3:00 AM CDT | Special Weather Statement | OUN | Grant | 30 min |
| Jul 8, 3:09 AM CDT | Special Weather Statement | OUN | Woods, Woodward | 36 min |
| Jul 8, 1:48 PM CDT | Special Weather Statement | OUN | Marshall | 27 min |
| Jul 8, 3:31 PM CDT | Special Weather Statement | OUN | Murray | 29 min |
| Jul 8, 3:56 PM CDT | Areal Flood Advisory | OUN | Carter, Murray | 3 hr |
| Jul 8, 4:04 PM CDT | Special Weather Statement | OUN | Murray | 26 min |
| Jul 8, 4:05 PM CDT | Special Weather Statement | OUN | Jefferson | 25 min |
| Jul 8, 4:23 PM CDT | Special Weather Statement | OUN | Grady | 22 min |
| Jul 8, 4:34 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 41 min |
| Jul 8, 4:36 PM CDT | Special Weather Statement | OUN | Murray | 24 min |
| Jul 8, 4:47 PM CDT | Areal Flood Advisory | OUN | Grady | 3 hr |
| Jul 8, 5:03 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 25 min |
| Jul 8, 5:07 PM CDT | Special Weather Statement | OUN | Garvin | 23 min |
| Jul 8, 5:09 PM CDT | Special Weather Statement | OUN | Garvin | 36 min |
| Jul 8, 5:25 PM CDT | Severe Thunderstorm Warning | OUN | Garvin | 37 min |
| Jul 8, 5:34 PM CDT | Special Weather Statement | OUN | Garvin | 26 min |
| Jul 8, 5:39 PM CDT | Areal Flood Advisory | OUN | Garvin, McClain, Pottawatomie | 3 hr |
| Jul 8, 5:49 PM CDT | Special Weather Statement | OUN | McClain | 26 min |
| Jul 8, 5:58 PM CDT | Special Weather Statement | OUN | McClain | 32 min |
| Jul 8, 6:11 PM CDT | Special Weather Statement | OUN | Pottawatomie | 34 min |
| Jul 8, 6:23 PM CDT | Special Weather Statement | OUN | Comanche | 37 min |
| Jul 8, 6:36 PM CDT | Special Weather Statement | OUN | Kiowa | 24 min |
| Jul 8, 6:43 PM CDT | Special Weather Statement | OUN | Stephens | 32 min |
| Jul 8, 6:45 PM CDT | Special Weather Statement | OUN | Pottawatomie | 30 min |
| Jul 8, 6:54 PM CDT | Severe Thunderstorm Warning | OUN | Stephens | 51 min |
| Jul 8, 2:42 PM CDT | Special Weather Statement | OUN | Baylor | 33 min |
| Jul 8, 2:58 PM CDT | Special Weather Statement | OUN | Knox | 32 min |
| Jul 8, 3:27 PM CDT | Special Weather Statement | OUN | Baylor | 33 min |
| Jul 8, 3:33 PM CDT | Special Weather Statement | OUN | Clay | 27 min |
| Jul 8, 3:42 PM CDT | Special Weather Statement | OUN | Knox | 33 min |
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.