Alert archive / Oklahoma / Special Weather Statements in 2021
Special Weather Statement, NWS Norman, OK
NWS Norman, OK issued this special weather statement at May 17, 2021, 2:01 AM CDT for Jefferson County, Stephens County, Oklahoma. It was in force for 29 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- May 17, 2021, 2:01 AM CDT (07:01 UTC)
- Expired
- May 17, 2021, 2:30 AM CDT
- In force
- 29 min
- Issued by
- NWS Norman, OK
Counties Jefferson County, OK, Stephens County, OK
The radar
The Altus AFB radar (KFDR), 117 km from the middle of the area, began a volume at 07:01 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
Fort Worth, TX (KFWD), launched 00:00Z, 7.0 hours before the alert went out and 143 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
- 496 J/kg
- Mixed-layer CIN
- -83 J/kg
- Mixed-layer LCL
- 815 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement 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 special weather statement went out at May 17, 12:31 AM CDT, 1 hour 30 minutes earlier.
Area forecast discussion, May 17, 12:31 AM CDT, 1 hour 30 minutes before
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</html>Hazardous weather outlook, May 16, 10:42 PM CDT, 3 hours 19 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 1042 PM CDT Sun May 16 2021 OKZ004>048-050>052-TXZ083>090-180345- 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- 1042 PM CDT Sun May 16 2021 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Through Tonight... .Thunderstorms... Scattered thunderstorms will continue across portions of western north Texas and southern Oklahoma through late tonight. Damaging wind gusts exceeding 60 mph and hail up to the size of half dollars will be possible mainly across western north Texas until 200 AM or so. .Heavy Rainfall... Localized flooding will be possible through tonight mainly across portions of southern Oklahoma and western north Texas. .DAYS TWO THROUGH SEVEN...Monday through Saturday... .Thunderstorms... Thunderstorm chances will continue thru Saturday. Severe thunderstorm chances return early Monday evening to the western half of Oklahoma and western north Texas. Very large hail up to the size of baseballs, damaging winds exceeding 70 mph, and perhaps a tornado or two will be possible. Strong to severe thunderstorms will be possible Tuesday and Wednesday. Hail and gusty winds could accompany any of the stronger thunderstorms. .Heavy Rainfall... Flooding will be possible mainly along and south of Interstate 44 Monday thru at least Wednesday. Many locations across this region could receive over 3 inches of total rainfall by the end of the week. Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook.
In the hours before
Local storm report, May 16, 11:54 PM CDT, 2 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
1154 PM CDT SUN MAY 16 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1152 PM TSTM WND GST 1 WSW VERNON 34.15N 99.30W
05/16/2021 M60 MPH WILBARGER TX TRAINED SPOTTER
&&
MDAYSpecial weather statement, May 17, 12:15 AM CDT, 1 hour 46 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 1215 AM CDT Mon May 17 2021 OKZ035>038-170545- Kiowa OK-Tillman OK-Comanche OK-Jackson OK- 1215 AM CDT Mon May 17 2021 ...SIGNIFICANT WEATHER ADVISORY FOR central Kiowa...Tillman... northwestern Comanche and northeastern Jackson Counties Until 1245 AM CDT... AT 1213 AM CDT, strong thunderstorms were along a line extending from near Roosevelt to 4 miles northeast of Davidson, moving northeast at 25 MPH. HAZARDS INCLUDE... Hail up to the size of nickels... Wind gusts to 50 MPH... Locations impacted include... Frederick, Snyder, Tipton, Mountain Park, Indiahoma, Roosevelt, Manitou, Headrick, Hollister, Cooperton, Loveland, Tom Steed Reservoir, southwestern Fort Sill and Wichita Mountains Wildlife Refuge. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3506 9863 3432 9867 3425 9917 3485 9915 TIME...MOT...LOC 0513Z 227DEG 22KT 3482 9903 3430 9904 11
Special weather statement, May 17, 12:55 AM CDT, 1 hour 6 minutes before
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</html>Local storm report, May 17, 1:14 AM CDT, 47 minutes before
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</html>Special weather statement, May 17, 2:01 AM CDT, 0 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 |
|---|---|---|---|---|
| May 16, 7:09 PM CDT | Special Weather Statement | OUN | Marshall | 36 min |
| May 16, 7:46 PM CDT | Special Weather Statement | OUN | Marshall | 29 min |
| May 16, 8:06 PM CDT | River Flood Advisory | OUN | Pottawatomie, Seminole | 16 hr |
| May 16, 8:06 PM CDT | River Flood Advisory | OUN | Atoka | 24 hr |
| May 16, 8:21 PM CDT | Areal Flood Warning | OUN | Jefferson, Stephens | 4 hr |
| May 16, 9:56 PM CDT | Areal Flood Warning | OUN | Jefferson | 3 hr |
| May 16, 9:59 PM CDT | Severe Thunderstorm Warning | OUN | Harmon, Jackson | 76 min |
| May 16, 11:44 PM CDT | Special Weather Statement | OUN | Tillman | 31 min |
| May 17, 12:14 AM CDT | Severe Thunderstorm Warning | OUN | Tillman | 38 min |
| May 17, 12:15 AM CDT | Special Weather Statement | OUN | Tillman | 30 min |
| May 17, 12:29 AM CDT | Severe Thunderstorm Warning | OUN | Comanche, Kiowa, Tillman | 22 min |
| May 17, 12:55 AM CDT | Special Weather Statement | OUN | Comanche, Cotton, Tillman | 35 min |
| May 17, 1:28 AM CDT | Special Weather Statement | OUN | Cotton, Grady, Jefferson, Stephens | 32 min |
| May 17, 12:39 PM CDT | River Flood Advisory | OUN | Comanche, Cotton | 20 hr |
| May 17, 2:27 PM CDT | River Flood Advisory | OUN | Cotton | 18 hr |
| May 17, 6:39 PM CDT | Severe Thunderstorm Warning | OUN | Tillman | 12 min |
| May 16, 7:23 PM CDT | Severe Thunderstorm Warning | OUN | Clay | 52 min |
| May 16, 7:42 PM CDT | Special Weather Statement | OUN | Foard | 33 min |
| May 16, 7:56 PM CDT | Severe Thunderstorm Warning | OUN | Foard | 16 min |
| May 16, 8:10 PM CDT | Severe Thunderstorm Warning | OUN | Clay | 65 min |
| May 16, 8:52 PM CDT | Areal Flood Advisory | OUN | Clay | 3 hr |
| May 16, 9:04 PM CDT | Severe Thunderstorm Warning | OUN | Clay | 56 min |
| May 16, 9:22 PM CDT | Special Weather Statement | OUN | Archer | 23 min |
| May 16, 9:29 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Clay | 61 min |
| May 16, 10:31 PM CDT | Severe Thunderstorm Warning | OUN | Knox | 44 min |
| May 16, 11:06 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Knox | 39 min |
| May 16, 11:13 PM CDT | Special Weather Statement | OUN | Foard, Knox | 32 min |
| May 16, 11:32 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Foard, Knox, Wilbarger | 58 min |
| May 16, 11:38 PM CDT | Severe Thunderstorm Warning | OUN | Baylor | 52 min |
| May 17, 12:25 AM CDT | Areal Flood Advisory | OUN | Baylor, Foard, Knox, Wilbarger | 3 hr |
| May 17, 2:25 PM CDT | River Flood Advisory | OUN | Wichita, Wilbarger | 18 hr |
| May 17, 5:13 PM CDT | Special Weather Statement | OUN | Knox | 32 min |
| May 17, 5:45 PM CDT | Special Weather Statement | OUN | Knox | 30 min |
| May 17, 6:05 PM CDT | Special Weather Statement | OUN | Foard | 40 min |
| May 17, 6:18 PM CDT | Special Weather Statement | OUN | Foard | 42 min |
| May 17, 6:23 PM CDT | Severe Thunderstorm Warning | OUN | Knox | 67 min |
Nearby
Special Weather Statements in Oklahoma, 2021Every special weather statement in 2021
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.