Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 476, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 29, 2018, 4:11 AM CDT for 4 counties in Oklahoma. It was in force for 49 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 29, 2018, 4:11 AM CDT (09:11 UTC)
- Expired
- Jul 29, 2018, 5:00 AM CDT
- In force
- 49 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Garfield County, OK, Grant County, OK, Kay County, OK, Noble County, OK
The radar
The Vance AFB radar (KVNX), 59 km from the middle of the area, began a volume at 09:14 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 |
|---|---|---|---|
| Jul 29, 1:59 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 9.2 hours before the alert went out and 153 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
- 2116 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1419 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 4.6
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 29, 4:11 AM CDT, 0 minutes earlier.
Area forecast discussion, Jul 29, 4:11 AM CDT, 0 minutes before
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Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 1003 PM CDT Sat Jul 28 2018 OKZ004>048-050>052-TXZ083>090-300315- 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- 1003 PM CDT Sat Jul 28 2018 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Through and Tonight... .Thunderstorms... There is a Slight Risk for severe thunderstorms across portions of northern Oklahoma tonight. Location... The Slight Risk is north of a line from near Laverne to Enid, Oklahoma. A Marginal Risk covers much of the rest of northern Oklahoma. Timing... The most likely time for severe thunderstorms will be after midnight. Impacts... Damaging wind gusts up to 70 mph. Discussion... A complex of thunderstorms is expected to move into northern Oklahoma tonight and move east-southeastward across the eastern half of Oklahoma. Thunderstorms should gradualy weaken as they move into Oklahoma. .SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... Storm spotter groups and emergency management personnel across northern Oklahoma should prepare for severe weather operations tonight. .DAYS TWO THROUGH SEVEN...Sunday through Friday... .Thunderstorms... A marginal risk of severe thunderstorms, with the primary hazard being damaging wind gusts, covers all of Oklahoma and most of western north Texas Sunday night. Storms are expected to continue Monday and Monday night. There is a low chance of thunderstorms across western Oklahoma and adjacent parts of north Texas late Wednesday. .Heavy Rain... Heavy rainfall is possible Sunday night through late Monday, which may lead to flooding. 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 29, 1:05 AM CDT, 3 hours 6 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 105 AM CDT SUN JUL 29 2018 OKZ004-009-290630- Harper OK-Ellis OK- 105 AM CDT SUN JUL 29 2018 ...SIGNIFICANT WEATHER ADVISORY FOR southwestern Harper and northwestern Ellis Counties Until 130 AM CDT.... AT 101 AM CDT, strong thunderstorms were along a line extending from near Slapout to 4 miles west of Lipscomb, moving east at 30 MPH. HAZARDS INCLUDE... Wind gusts to 50 MPH... PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3673 10000 3667 9956 3604 10000 TIME...MOT...LOC 0601Z 281DEG 28KT 3661 10010 3623 10034 BRB
Special weather statement, Jul 29, 2:14 AM CDT, 1 hour 57 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 214 AM CDT SUN JUL 29 2018 OKZ004-010-290745- Woodward OK-Harper OK- 214 AM CDT SUN JUL 29 2018 ...SIGNIFICANT WEATHER ADVISORY FOR central Woodward and southeastern Harper Counties Until 245 AM CDT.... AT 212 AM CDT, a strong thunderstorm was located 9 miles north of Woodward, moving east at 35 MPH. HAZARDS INCLUDE... Wind gusts to 50 MPH... PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3644 9952 3670 9959 3677 9913 3644 9909 TIME...MOT...LOC 0712Z 264DEG 28KT 3657 9938 30
Local storm report, Jul 29, 3:01 AM CDT, 1 hour 10 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 |
|---|---|---|---|---|
| Jul 28, 7:00 PM CDT | Special Weather Statement | OUN | Pottawatomie | 30 min |
| Jul 29, 1:05 AM CDT | Special Weather Statement | OUN | Ellis | 25 min |
| Jul 29, 2:14 AM CDT | Special Weather Statement | OUN | Woodward | 31 min |
| Jul 29, 2:43 AM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods, Woodward | 47 min |
| Jul 29, 3:23 AM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Garfield, Grant, Major | 52 min |
| Jul 29, 5:06 AM CDT | Special Weather Statement | OUN | Lincoln, Logan, Payne | 24 min |
| Jul 29, 5:41 AM CDT | Special Weather Statement | OUN | Lincoln, Payne | 34 min |
| Jul 29, 8:30 AM CDT | Special Weather Statement | OUN | Hughes, Seminole | 30 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.