Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 457, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 12, 2018, 6:36 PM CDT for Grant County, Oklahoma. It was in force for 24 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, 6:36 PM CDT (23:36 UTC)
- Expired
- Jul 12, 2018, 7:00 PM CDT
- In force
- 24 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Grant County, OK
The radar
The Vance AFB radar (KVNX), 31 km from the middle of the area, began a volume at 23:39 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, 11.6 hours before the alert went out and 179 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, 6:11 PM CDT, 25 minutes earlier.
Area forecast discussion, Jul 12, 6:11 PM CDT, 25 minutes before
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</html>Hazardous weather outlook, Jul 12, 6:35 PM CDT, 1 minute before
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Special weather statement, Jul 12, 5:13 PM CDT, 1 hour 23 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 513 PM CDT THU JUL 12 2018 OKZ010-122245- Woodward OK- 513 PM CDT THU JUL 12 2018 ...SIGNIFICANT WEATHER ADVISORY FOR southwestern Woodward County Until 545 PM CDT.... AT 512 PM CDT, a strong thunderstorm was located 6 miles northwest of Sharon, moving north at 15 MPH. HAZARDS INCLUDE... Wind gusts to 40 MPH... PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3626 9930 3623 9952 3646 9958 3648 9928 TIME...MOT...LOC 2212Z 171DEG 14KT 3633 9942 30
Special weather statement, Jul 12, 5:21 PM CDT, 1 hour 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
521 PM CDT THU JUL 12 2018
OKZ048-122245-
Atoka OK-
521 PM CDT THU JUL 12 2018
...SIGNIFICANT WEATHER ADVISORY FOR northeastern Atoka County Until
545 PM CDT....
AT 519 PM CDT, a strong thunderstorm was located 5 miles east of
Stringtown, moving northwest at 15 MPH.
HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 50 MPH...
Heavy rain that can lead to reduced visibility...
Locations impacted include...
Stringtown, Wardville, Atoka Reservoir, Chockie and McGee Creek Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3434 9579 3432 9598 3451 9609 3467 9609
3468 9607 3468 9593
TIME...MOT...LOC 2219Z 145DEG 15KT 3449 9596
MAHALESpecial weather statement, Jul 12, 5:25 PM CDT, 1 hour 11 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 525 PM CDT THU JUL 12 2018 OKZ005-006-122300- Alfalfa OK-Woods OK- 525 PM CDT THU JUL 12 2018 ...SIGNIFICANT WEATHER ADVISORY FOR northwestern Alfalfa and northeastern Woods Counties Until 600 PM CDT.... AT 522 PM CDT, a strong thunderstorm was located 4 miles west of Capron, moving north at 15 MPH. HAZARDS INCLUDE... Hail up to one-half inch diameter... Wind gusts to 50 MPH... PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3684 9854 3684 9877 3700 9880 3700 9851 TIME...MOT...LOC 2222Z 179DEG 14KT 3692 9866 30
Local storm report, Jul 12, 5:39 PM CDT, 57 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, 2:56 PM CDT | Severe Thunderstorm Warning | OUN | Bryan, Johnston | 34 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, 6:47 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.