Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 452, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 12, 2018, 2:56 PM CDT for Bryan County, Johnston 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
- Jul 12, 2018, 2:56 PM CDT (19:56 UTC)
- Expired
- Jul 12, 2018, 3:30 PM CDT
- In force
- 34 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bryan County, OK, Johnston County, OK
The radar
The Norman radar (KTLX), 152 km from the middle of the area, began a volume at 19:58 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, 7.9 hours before the alert went out and 148 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
- 942 J/kg
- Mixed-layer CIN
- -47 J/kg
- Mixed-layer LCL
- 1482 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 0 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 12, 12:09 PM CDT, 2 hours 47 minutes earlier.
Area forecast discussion, Jul 12, 12:09 PM CDT, 2 hours 47 minutes before
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</html>Hazardous weather outlook, Jul 12, 11:56 AM CDT, 3 hours before
Hazardous Weather Outlook National Weather Service Norman OK 1156 AM CDT Thu Jul 12 2018 OKZ004>048-050>052-TXZ083>090-131200- 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- 1156 AM CDT Thu Jul 12 2018 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...This Afternoon and Tonight... .Thunderstorms... Scattered thunderstorms are expected today and tonight across southern Oklahoma and adjacent parts of of northern Texas. .Heat... Heat index values will rise to 104 this afternoon across central Oklahoma from the northern to southern border. .DAYS TWO THROUGH SEVEN...Friday through Wednesday... .Thunderstorms... Scattered thunderstorms are expected Friday, and in northern Oklahoma next Monday through Wednesday. .Heat... Much of Oklahoma and northern Texas will have afternoon heat index values above 100 through much of next week. 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 12, 12:42 PM CDT, 2 hours 14 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 12, 12:42 PM CDT | Special Weather Statement | OUN | Carter | 33 min |
| Jul 12, 3:02 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie | 28 min |
| Jul 12, 3:10 PM CDT | Special Weather Statement | OUN | Marshall | 35 min |
| Jul 12, 3:13 PM CDT | Special Weather Statement | OUN | Garfield | 32 min |
| Jul 12, 3:25 PM CDT | Special Weather Statement | OUN | Marshall | 35 min |
| Jul 12, 3:30 PM CDT | Special Weather Statement | OUN | Dewey | 30 min |
| Jul 12, 3:49 PM CDT | Special Weather Statement | OUN | Pontotoc | 26 min |
| Jul 12, 3:58 PM CDT | Special Weather Statement | OUN | Johnston | 32 min |
| Jul 12, 4:00 PM CDT | Severe Thunderstorm Warning | OUN | Pontotoc | 30 min |
| Jul 12, 4:01 PM CDT | Special Weather Statement | OUN | Major | 29 min |
| Jul 12, 5:13 PM CDT | Special Weather Statement | OUN | Woodward | 32 min |
| Jul 12, 5:21 PM CDT | Special Weather Statement | OUN | Atoka | 24 min |
| Jul 12, 5:25 PM CDT | Special Weather Statement | OUN | Woods | 35 min |
| Jul 12, 5:37 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 23 min |
| Jul 12, 5:58 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Woods | 36 min |
| Jul 12, 6:15 PM CDT | Special Weather Statement | OUN | Harper | 30 min |
| Jul 12, 6:26 PM CDT | Special Weather Statement | OUN | Grant | 34 min |
| Jul 12, 6:36 PM CDT | Severe Thunderstorm Warning | OUN | Grant | 24 min |
| Jul 12, 6:47 PM CDT | Special Weather Statement | OUN | Harper | 28 min |
| Jul 12, 6:48 PM CDT | Special Weather Statement | OUN | Clay | 27 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.