Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 847, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Sep 18, 2017, 12:20 AM CDT for Caddo County, Comanche County, Cotton County, Oklahoma. It was in force for 40 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
- Sep 18, 2017, 12:20 AM CDT (05:20 UTC)
- Expired
- Sep 18, 2017, 1:00 AM CDT
- In force
- 40 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Caddo County, OK, Comanche County, OK, Cotton County, OK
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 5.3 hours before the alert went out and 108 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
- 380 J/kg
- Mixed-layer CIN
- -121 J/kg
- Mixed-layer LCL
- 1027 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 47 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -1.5
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 Sep 17, 7:16 PM CDT, 5 hours 4 minutes earlier.
Area forecast discussion, Sep 17, 7:16 PM CDT, 5 hours 4 minutes before
Area Forecast Discussion National Weather Service Norman OK 716 PM CDT Sun Sep 17 2017 .DISCUSSION... && .AVIATION... Showers and thunderstorms will be scattered across some of central and southern Oklahoma overnight. East winds north of a weak front across southern Oklahoma will turn south as the front dissolves by mid-day Monday. VFR conditions are expected outside of the few intense thunderstorms. && .PRELIMINARY POINT TEMPS/POPS... Oklahoma City OK 71 91 72 93 / 40 20 10 10 Hobart OK 69 92 72 96 / 50 10 10 20 Wichita Falls TX 73 93 73 97 / 20 10 10 10 Gage OK 64 92 69 95 / 50 20 20 10 Ponca City OK 69 89 70 93 / 40 40 20 10 Durant OK 70 91 72 93 / 10 10 0 10 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...None. TX...None. && 25/09/09
Hazardous weather outlook, Sep 17, 9:07 PM CDT, 3 hours 13 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 907 PM CDT Sun Sep 17 2017 OKZ004>048-050>052-TXZ083>090-190215- 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- 907 PM CDT Sun Sep 17 2017 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Rest of Tonight... .Thunderstorms... Showers and storms will continue to develop and move across portions of Oklahoma and western north Texas through early Monday morning. A few of the storms in parts of southern Oklahoma and western north Texas could become strong to severe with hail up to the size of half dollars and wind gusts to 65 mph. Otherwise, heavy rain and cloud to ground lightning will be the main concerns. .DAYS TWO THROUGH SEVEN...Monday through Saturday... .Thunderstorms... Remnant thunderstorms will be possible Monday morning across portions of central and eastern Oklahoma. Additional thunderstorms may develop Monday afternoon across northern Oklahoma, where there is Marginal Risk for strong to severe thunderstorms. Hail and gusty winds are the primary hazards. A low chance of thunderstorms will return on Thursday with increasing chances of thunderstorms toward the upcoming weekend. Locally heavy rainfall will be possible, especially by Saturday. .Fire Weather... Elevated fire weather conditions will be possible across portions of Oklahoma and north Texas from Tuesday through Friday of this week due to hot temperatures, breezy conditions, and low relative humidity. Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook.
In the hours before
Local storm report, Sep 17, 11:31 PM CDT, 49 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1131 PM CDT SUN SEP 17 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1029 PM TSTM WND DMG ALTUS 34.64N 99.33W
09/17/2017 JACKSON OK TRAINED SPOTTER
POWER LINES DOWN IN ALTUS
&&
SCSpecial weather statement, Sep 17, 11:36 PM CDT, 44 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1136 PM CDT SUN SEP 17 2017
OKZ037-TXZ085-086-180500-
Tillman OK-Wichita TX-Wilbarger TX-
1136 PM CDT SUN SEP 17 2017
...SIGNIFICANT WEATHER ADVISORY FOR southern Tillman...northwestern
Wichita and east central Wilbarger Counties Until midnight CDT...
AT 1133 PM CDT, strong thunderstorms were along a line extending from
near Hollister to near Harrold, moving east at 20 MPH.
HAZARDS INCLUDE...
Wind gusts over 50 MPH...
Minor flooding in areas of poor drainage...
Locations impacted include...
Electra, Grandfield, Davidson, Hollister, Loveland, Oklaunion,
Harrold and Haynesville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3410 9916 3437 9911 3433 9861 3429 9861
3396 9876
TIME...MOT...LOC 0433Z 272DEG 18KT 3435 9892 3406 9903
MAHALELocal storm report, Sep 17, 11:47 PM CDT, 33 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 |
|---|---|---|---|---|
| Sep 17, 7:43 PM CDT | Special Weather Statement | OUN | Pontotoc | 47 min |
| Sep 17, 7:59 PM CDT | Special Weather Statement | OUN | Love | 46 min |
| Sep 17, 8:26 PM CDT | Special Weather Statement | OUN | Greer, Harmon | 49 min |
| Sep 17, 8:44 PM CDT | Areal Flood Advisory | OUN | Love | 2 hr |
| Sep 17, 9:24 PM CDT | Special Weather Statement | OUN | Greer, Harmon | 51 min |
| Sep 17, 10:18 PM CDT | Special Weather Statement | OUN | Kiowa | 42 min |
| Sep 17, 10:40 PM CDT | Special Weather Statement | OUN | Kiowa | 35 min |
| Sep 17, 11:17 PM CDT | Special Weather Statement | OUN | Tillman | 43 min |
| Sep 17, 11:36 PM CDT | Special Weather Statement | OUN | Tillman | 24 min |
| Sep 17, 11:40 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Tillman | 50 min |
| Sep 17, 11:47 PM CDT | Special Weather Statement | OUN | Jackson | 43 min |
| Sep 18, 12:10 AM CDT | Special Weather Statement | OUN | Jackson | 35 min |
| Sep 18, 12:16 AM CDT | Severe Thunderstorm Warning | OUN | Jackson, Tillman | 23 min |
| Sep 18, 12:40 AM CDT | Special Weather Statement | OUN | Tillman | 35 min |
| Sep 18, 1:01 AM CDT | Special Weather Statement | OUN | Cotton, Grady, Stephens | 29 min |
| Sep 18, 5:44 AM CDT | Special Weather Statement | OUN | Woodward | 31 min |
| Sep 18, 6:15 AM CDT | Special Weather Statement | OUN | Alfalfa, Major, Woods, Woodward | 30 min |
| Sep 18, 6:45 AM CDT | Special Weather Statement | OUN | Alfalfa, Garfield, Major | 45 min |
| Sep 17, 8:14 PM CDT | Areal Flood Advisory | OUN | Clay | 2 hr |
| Sep 17, 9:37 PM CDT | Special Weather Statement | OUN | Hardeman | 23 min |
| Sep 17, 11:21 PM CDT | Special Weather Statement | OUN | Hardeman | 24 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.