Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 566, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 18, 2018, 3:44 PM CDT for Carter County, Jefferson County, Stephens County, Oklahoma. It was in force for 34 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
- Aug 18, 2018, 3:44 PM CDT (20:44 UTC)
- Expired
- Aug 18, 2018, 4:18 PM CDT
- In force
- 34 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Carter County, OK, Jefferson County, OK, Stephens County, OK
The radar
The Altus AFB radar (KFDR), 121 km from the middle of the area, began a volume at 20:46 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
Fort Worth, TX (KFWD), launched 12:00Z, 8.7 hours before the alert went out and 165 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
- 452 J/kg
- Mixed-layer CIN
- -195 J/kg
- Mixed-layer LCL
- 1585 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 147 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
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 Aug 18, 3:09 PM CDT, 35 minutes earlier.
Area forecast discussion, Aug 18, 3:09 PM CDT, 35 minutes before
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</html>Hazardous weather outlook, Aug 18, 12:00 PM CDT, 3 hours 44 minutes before
Hazardous Weather Outlook National Weather Service Norman OK 1200 PM CDT Sat Aug 18 2018 OKZ004>048-050>052-TXZ083>090-191700- 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- 1200 PM CDT Sat Aug 18 2018 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Through Tonight... .Thunderstorms... There is a Marginal Risk of severe thunderstorms tonight. Location... Western Oklahoma and far western north Texas. Timing... 11 PM to 3 AM. Impacts... Up to 60 mph winds. Up to quarter size hail. Discussion... A complex of thunderstorms is expected to move into western Oklahoma late this evening or after midnight Sunday morning and spread south and southeast during the early morning hours. Some of these storms will be capable of producing strong winds and hail, although widespread severe weather is not anticipated. The threat for severe weather should decrease with eastward extent. In addition, widely scattered thunderstorms are possible this afternoon, mainly across southwestern Oklahoma and adjacent areas of western north Texas. Some strong storms are possible, but organized severe weather is not expected. .SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... Storm spotter groups and emergency management personnel across western Oklahoma and far western north Texas should prepare for severe weather operations tonight. .Heavy Rainfall... Heavy rainfall from thunderstorms this evening and overnight may result in areas of localized flooding, especially at locations that have recently had significant rainfall. .Heat... Heat index values of 100 to 105 degrees are expected this afternoon, primarily across southern Oklahoma and western north Texas. .DAYS TWO THROUGH SEVEN...Sunday through Friday... .Thunderstorms... Thunderstorms are possible Sunday, especially Sunday morning, and could linger into Monday morning. A few strong to severe storms are possible during this period, although widespread or significant severe weather is unlikely. Thunderstorms will also be possible Wednesday and Thursday of next week. .Heavy Rainfall.. Heavy rainfall from thunderstorms Sunday may result in localized flooding, especially at locations that have recently had significant rainfall. Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook. Mahale
In the hours before
Special weather statement, Aug 18, 1:57 PM CDT, 1 hour 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 157 PM CDT SAT AUG 18 2018 OKZ039-044-045-181930- Cotton OK-Stephens OK-Jefferson OK- 157 PM CDT SAT AUG 18 2018 ...SIGNIFICANT WEATHER ADVISORY FOR northeastern Cotton... southwestern Stephens and northwestern Jefferson Counties Until 230 PM CDT.... AT 155 PM CDT, a strong thunderstorm was located near Walters, moving east at 35 MPH. HAZARDS INCLUDE... Hail up to the size of nickels... Wind gusts to 50 MPH... LAT...LON 3427 9843 3443 9843 3449 9805 3422 9802 TIME...MOT...LOC 1855Z 266DEG 30KT 3434 9832 ..speg.
Local storm report, Aug 18, 2:25 PM CDT, 1 hour 19 minutes before
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</html>Special weather statement, Aug 18, 3:32 PM CDT, 12 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 |
|---|---|---|---|---|
| Aug 17, 7:18 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, Murray, Pontotoc | 42 min |
| Aug 17, 7:57 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Garvin, Murray, Stephens | 48 min |
| Aug 17, 7:59 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, Murray, Pontotoc | 25 min |
| Aug 17, 8:12 PM CDT | Areal Flood Advisory | OUN | Garvin | 3 hr |
| Aug 17, 8:12 PM CDT | Areal Flood Advisory | OUN | Garvin | 3 hr |
| Aug 17, 8:57 PM CDT | Special Weather Statement | OUN | Grady | 33 min |
| Aug 18, 1:57 PM CDT | Special Weather Statement | OUN | Cotton | 33 min |
| Aug 18, 2:24 PM CDT | Severe Thunderstorm Warning | OUN | Cotton, Jefferson, Stephens | 51 min |
| Aug 18, 2:46 PM CDT | Areal Flood Advisory | OUN | Cotton | 119 min |
| Aug 18, 3:00 PM CDT | Severe Thunderstorm Warning | OUN | Jefferson, Stephens | 45 min |
| Aug 18, 3:32 PM CDT | Special Weather Statement | OUN | Jefferson | 13 min |
| Aug 18, 3:53 PM CDT | Special Weather Statement | OUN | Stephens | 37 min |
| Aug 18, 4:03 PM CDT | Special Weather Statement | OUN | Love | 27 min |
| Aug 18, 4:22 PM CDT | Special Weather Statement | OUN | Carter, Garvin, Love, Murray | 38 min |
| Aug 18, 4:51 PM CDT | Severe Thunderstorm Warning | OUN | Carter | 24 min |
| Aug 18, 4:56 PM CDT | Special Weather Statement | OUN | Love | 34 min |
| Aug 18, 5:08 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Johnston, Marshall | 39 min |
| Aug 18, 5:30 PM CDT | Special Weather Statement | OUN | Marshall | 30 min |
| Aug 18, 5:38 PM CDT | Severe Thunderstorm Warning | OUN | Love | 18 min |
| Aug 18, 5:42 PM CDT | Special Weather Statement | OUN | Marshall | 33 min |
| Aug 18, 6:09 PM CDT | Special Weather Statement | OUN | Marshall | 36 min |
| Aug 18, 4:50 PM CDT | Special Weather Statement | OUN | Clay | 25 min |
| Aug 18, 5:09 PM CDT | Special Weather Statement | OUN | Clay | 36 min |
| Aug 18, 5:21 PM CDT | Areal Flood Advisory | OUN | Clay | 3 hr |
| Aug 18, 5:45 PM CDT | Special Weather Statement | OUN | Jack | 30 min |
| Aug 18, 5:53 PM CDT | Severe Thunderstorm Warning | OUN | Clay | 34 min |
| Aug 18, 6:24 PM CDT | Special Weather Statement | OUN | Clay | 36 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2018Every severe thunderstorm warning in 2018
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.