Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 464, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jun 22, 2020, 11:18 PM CDT for Harmon County, Jackson County, Oklahoma; Foard County, Hardeman County, Texas. It was in force for 42 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
- Jun 22, 2020, 11:18 PM CDT (04:18 UTC)
- Expired
- Jun 23, 2020, 12:00 AM CDT
- In force
- 42 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Harmon County, OK, Jackson County, OK, Foard County, TX, Hardeman County, TX
The radar
The Altus AFB radar (KFDR), 66 km from the middle of the area, began a volume at 04:18 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 |
|---|---|---|---|
| Jun 22, 9:06 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 00:00Z, 4.3 hours before the alert went out and 205 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
- 1588 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 1913 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 277 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 11.1
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 Jun 22, 10:56 PM CDT, 22 minutes earlier.
Area forecast discussion, Jun 22, 10:56 PM CDT, 22 minutes before
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</html>Hazardous weather outlook, Jun 22, 12:19 PM CDT, 10 hours 59 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 1219 PM CDT Mon Jun 22 2020 OKZ004>048-050>052-TXZ083>090-231730- 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- 1219 PM CDT Mon Jun 22 2020 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... Strong to severe storms are possible throughout western and southern Oklahoma as well as western north Texas tonight and into early Tuesday morning. A line of storms is expected to move into western Oklahoma tonight after 9pm from Colorado and the Oklahoma/Texas panhandles. As they move south overnight, storm coverage will expand along the Red River and throughout western north Texas. Primary impacts will include hail up to the size of golf balls as well as wind gusts up to 65mph. Heavy rain and flooding will also be a concern with these storms. .SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... Storm spotter groups and emergency management personnel across western and southern Oklahoma as well as western north Texas should prepare for severe weather operations after 9pm and throughout the nighttime hours. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday... Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook. .Thunderstorms... Showers and thunderstorms will likely continue through the Tuesday morning hours in southern Oklahoma and western north Texas. These storms will likely produce heavy rain and possibly some strong winds as well. Throughout the rest of the week, storms are expected to develop in the High Plains and there is a slight chance these storms could persist while moving south and impact northern Oklahoma. A greater chance of storms occur late in the week when a upper level trough and low cyclone moves into the region.
In the hours before
Special weather statement, Jun 22, 9:55 PM CDT, 1 hour 23 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 955 PM CDT Mon Jun 22 2020 OKZ014-230345- Roger Mills OK- 955 PM CDT Mon Jun 22 2020 ...SIGNIFICANT WEATHER ADVISORY FOR central Roger Mills County Until 1045 PM CDT... AT 953 PM CDT, a strong thunderstorm was located near Crawford, moving southeast at 15 MPH. HAZARDS INCLUDE... Hail up to the size of nickels... Wind gusts over 50 MPH... Heavy rain can lead to reduced visibility... Frequent cloud to ground lightning... Locations impacted include... Strong City, Crawford and Roll. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3580 9989 3587 9978 3570 9954 3557 9979 TIME...MOT...LOC 0253Z 326DEG 14KT 3579 9979 03
Special weather statement, Jun 22, 10:04 PM CDT, 1 hour 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1004 PM CDT Mon Jun 22 2020
OKZ009-014-230345-
Roger Mills OK-Ellis OK-
1004 PM CDT Mon Jun 22 2020
...SIGNIFICANT WEATHER ADVISORY FOR northwestern Roger Mills and
southwestern Ellis Counties Until 1045 PM CDT...
AT 1001 PM CDT, a strong thunderstorm was located near Durham, moving
southeast at 20 MPH.
HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Heavy rain can lead to reduced visibility...
Frequent cloud to ground lightning...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3595 10000 3598 9993 3580 9963 3565 9991
3587 10000
TIME...MOT...LOC 0301Z 328DEG 17KT 3589 9991
03Local storm report, Jun 22, 10:26 PM CDT, 52 minutes before
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</html>Local storm report, Jun 22, 10:30 PM CDT, 48 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 |
|---|---|---|---|---|
| Jun 22, 8:38 PM CDT | Special Weather Statement | OUN | Ellis | 52 min |
| Jun 22, 9:16 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Roger Mills | 44 min |
| Jun 22, 9:55 PM CDT | Special Weather Statement | OUN | Roger Mills | 50 min |
| Jun 22, 10:04 PM CDT | Special Weather Statement | OUN | Roger Mills | 41 min |
| Jun 22, 10:09 PM CDT | Severe Thunderstorm Warning | OUN | Ellis | 51 min |
| Jun 22, 10:26 PM CDT | Severe Thunderstorm Warning | OUN | Ellis | 49 min |
| Jun 22, 10:46 PM CDT | Special Weather Statement | OUN | Roger Mills | 59 min |
| Jun 22, 11:15 PM CDT | Special Weather Statement | OUN | Roger Mills | 30 min |
| Jun 22, 11:26 PM CDT | Special Weather Statement | OUN | Ellis | 34 min |
| Jun 22, 11:59 PM CDT | Special Weather Statement | OUN | Custer, Dewey | 46 min |
| Jun 23, 12:20 AM CDT | Special Weather Statement | OUN | Greer, Harmon, Jackson | 70 min |
| Jun 23, 12:34 AM CDT | Severe Thunderstorm Warning | OUN | Greer, Jackson, Kiowa | 41 min |
| Jun 23, 12:44 AM CDT | Special Weather Statement | OUN | Custer, Washita | 61 min |
| Jun 23, 12:56 AM CDT | Special Weather Statement | OUN | Kiowa, Tillman | 64 min |
| Jun 23, 2:01 AM CDT | Special Weather Statement | OUN | Comanche, Cotton, Tillman | 44 min |
| Jun 23, 2:45 AM CDT | Special Weather Statement | OUN | Comanche, Cotton | 30 min |
| Jun 23, 10:02 AM CDT | Special Weather Statement | OUN | Coal | 28 min |
| Jun 23, 12:02 AM CDT | Special Weather Statement | OUN | Baylor, Foard, Hardeman, Knox, Wilbarger | 73 min |
| Jun 23, 1:16 AM CDT | Special Weather Statement | OUN | Baylor | 29 min |
| Jun 23, 1:51 AM CDT | Special Weather Statement | OUN | Archer, Wichita | 39 min |
| Jun 23, 2:31 AM CDT | Special Weather Statement | OUN | Archer, Wichita | 44 min |
| Jun 23, 4:42 AM CDT | Special Weather Statement | OUN | Clay | 33 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2020Severe Thunderstorm Warnings in Texas, 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.