Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 581, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jul 20, 2020, 6:06 PM CDT for Woodward 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 20, 2020, 6:06 PM CDT (23:06 UTC)
- Expired
- Jul 20, 2020, 6:30 PM CDT
- In force
- 24 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Woodward County, OK
The radar
The Vance AFB radar (KVNX), 108 km from the middle of the area, began a volume at 23:09 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, 11.1 hours before the alert went out and 215 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
- 555 J/kg
- Mixed-layer CIN
- -149 J/kg
- Mixed-layer LCL
- 1317 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 57 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 20, 6:06 PM CDT, 0 minutes earlier.
Area forecast discussion, Jul 20, 6:06 PM CDT, 0 minutes before
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Special weather statement, Jul 20, 3:43 PM CDT, 2 hours 23 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
343 PM CDT Mon Jul 20 2020
OKZ011-202115-
Major OK-
343 PM CDT Mon Jul 20 2020
...SIGNIFICANT WEATHER ADVISORY FOR eastern Major County Until 415 PM
CDT...
AT 338 PM CDT, a strong thunderstorm was located near Fairview,
moving east-northeast at 25 MPH.
HAZARDS INCLUDE...
Hail up to the size of golf balls...
Wind gusts to 50 MPH...
LAT...LON 3617 9814 3617 9858 3628 9860 3637 9849
3646 9825 3646 9824
TIME...MOT...LOC 2038Z 253DEG 23KT 3625 9847
..speg.Special weather statement, Jul 20, 4:19 PM CDT, 1 hour 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 419 PM CDT Mon Jul 20 2020 OKZ006-007-012-202145- Garfield OK-Alfalfa OK-Grant OK- 419 PM CDT Mon Jul 20 2020 ...SIGNIFICANT WEATHER ADVISORY FOR northwestern Garfield... southeastern Alfalfa and western Grant Counties Until 445 PM CDT... AT 415 PM CDT, strong thunderstorms were along a line extending from 7 miles northeast of Great Salt Plains Lake to near Goltry, moving east at 25 MPH. HAZARDS INCLUDE... Hail up to one-half inch diameter... Wind gusts to 50 MPH... LAT...LON 3647 9773 3646 9825 3687 9824 3691 9769 TIME...MOT...LOC 2115Z 264DEG 20KT 3681 9810 3651 9811 ..speg.
Special weather statement, Jul 20, 5:26 PM CDT, 40 minutes before
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Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 2:11 PM CDT | Special Weather Statement | OUN | Woods | 34 min |
| Jul 20, 2:30 PM CDT | Severe Thunderstorm Warning | OUN | Woods | 45 min |
| Jul 20, 2:52 PM CDT | Special Weather Statement | OUN | Major | 23 min |
| Jul 20, 2:54 PM CDT | Special Weather Statement | OUN | Roger Mills | 36 min |
| Jul 20, 3:14 PM CDT | Special Weather Statement | OUN | Alfalfa | 31 min |
| Jul 20, 3:43 PM CDT | Special Weather Statement | OUN | Major | 32 min |
| Jul 20, 3:44 PM CDT | Severe Thunderstorm Warning | OUN | Major | 46 min |
| Jul 20, 4:19 PM CDT | Special Weather Statement | OUN | Grant | 26 min |
| Jul 20, 4:24 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Major | 51 min |
| Jul 20, 4:28 PM CDT | Severe Thunderstorm Warning | OUN | Garfield, Grant | 47 min |
| Jul 20, 5:04 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Kingfisher | 41 min |
| Jul 20, 5:09 PM CDT | Severe Thunderstorm Warning | OUN | Garfield, Grant | 51 min |
| Jul 20, 5:26 PM CDT | Special Weather Statement | OUN | Custer, Washita | 34 min |
| Jul 20, 5:41 PM CDT | Special Weather Statement | OUN | Woodward | 34 min |
| Jul 20, 5:54 PM CDT | Areal Flood Advisory | OUN | Blaine, Custer, Dewey | 3 hr |
| Jul 20, 6:00 PM CDT | Special Weather Statement | OUN | Kay | 30 min |
| Jul 20, 6:28 PM CDT | Special Weather Statement | OUN | Kay | 32 min |
| Jul 20, 6:29 PM CDT | Special Weather Statement | OUN | Blaine, Washita | 46 min |
| Jul 20, 6:44 PM CDT | Special Weather Statement | OUN | Canadian | 31 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2020Every severe thunderstorm warning in 2020
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.