Alert archive / Oklahoma / Special Weather Statements in 2021
Special Weather Statement, NWS Norman, OK
NWS Norman, OK issued this special weather statement at May 18, 2021, 1:28 AM CDT for Major County, Oklahoma. It was in force for 47 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 18, 2021, 1:28 AM CDT (06:28 UTC)
- Expired
- May 18, 2021, 2:15 AM CDT
- In force
- 47 min
- Issued by
- NWS Norman, OK
County Major County, OK
The radar
The Vance AFB radar (KVNX), 76 km from the middle of the area, began a volume at 06:28 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
Dodge City, (KDDC), launched 00:00Z, 6.5 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
- 456 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1128 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.2
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 18, 12:43 AM CDT, 45 minutes earlier.
Area forecast discussion, May 18, 12:43 AM CDT, 45 minutes before
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Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 1043 PM CDT Mon May 17 2021 OKZ004>048-050>052-TXZ083>090-190345- 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- 1043 PM CDT Mon May 17 2021 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Through Tonight... .Thunderstorms... A few strong to severe thunderstorms will remain possible thru late tonight, mainly across portions of northwestern and southwestern Oklahoma, and western north Texas. Hail up to the size of quarters and wind gusts up 60 mph will be possible. .Heavy Rainfall... Localized flooding could occur across portions of southern Oklahoma thru tonight. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday... .Thunderstorms... Thunderstorm chances will continue thru Saturday. A few severe thunderstorms will be possible Tuesday afternoon and evening mainly across portions of eastern and southeastern Oklahoma. Hail up to the size of golf balls and damaging wind gusts up to 60 mph will be possible. Strong to severe storms will again be possible across western Oklahoma and western north Texas Wednesday afternoon and evening. .Heavy Rainfall... Areas of flooding will be possible mainly along and south of Interstate 44 thru at least Wednesday. 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, May 18, 12:21 AM CDT, 1 hour 7 minutes before
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</html>Special weather statement, May 18, 1:28 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 17, 10:03 PM CDT | Special Weather Statement | OUN | Jackson | 27 min |
| May 17, 10:29 PM CDT | Special Weather Statement | OUN | Harmon | 31 min |
| May 17, 10:42 PM CDT | Severe Thunderstorm Warning | OUN | Harmon, Jackson | 33 min |
| May 17, 11:12 PM CDT | Special Weather Statement | OUN | Jackson | 33 min |
| May 17, 11:19 PM CDT | Special Weather Statement | OUN | Tillman | 41 min |
| May 17, 11:29 PM CDT | Special Weather Statement | OUN | Ellis, Harper, Roger Mills | 46 min |
| May 17, 11:43 PM CDT | Severe Thunderstorm Warning | OUN | Ellis, Woodward | 32 min |
| May 18, 12:19 AM CDT | Special Weather Statement | OUN | Woodward | 56 min |
| May 18, 12:21 AM CDT | Special Weather Statement | OUN | Roger Mills | 24 min |
| May 18, 12:44 AM CDT | Special Weather Statement | OUN | Washita | 61 min |
| May 18, 1:02 AM CDT | Special Weather Statement | OUN | Woodward | 58 min |
| May 18, 1:03 AM CDT | Special Weather Statement | OUN | Dewey | 57 min |
| May 18, 1:06 AM CDT | Special Weather Statement | OUN | Jefferson | 24 min |
| May 18, 2:00 AM CDT | Special Weather Statement | OUN | Comanche, Kiowa, Tillman | 30 min |
| May 18, 2:35 AM CDT | Special Weather Statement | OUN | Comanche, Cotton, Tillman | 55 min |
| May 18, 2:48 AM CDT | Special Weather Statement | OUN | Kingfisher | 42 min |
| May 18, 2:56 AM CDT | Special Weather Statement | OUN | Garfield | 49 min |
| May 18, 3:36 AM CDT | Special Weather Statement | OUN | Kingfisher | 39 min |
| May 18, 12:03 PM CDT | Special Weather Statement | OUN | Noble | 27 min |
| May 18, 4:14 PM CDT | Special Weather Statement | OUN | Alfalfa | 31 min |
| May 18, 4:44 PM CDT | Special Weather Statement | OUN | Garfield | 46 min |
| May 17, 7:00 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Knox | 45 min |
| May 17, 7:11 PM CDT | Special Weather Statement | OUN | Wilbarger | 34 min |
| May 17, 7:22 PM CDT | Areal Flood Advisory | OUN | Knox | 3 hr |
| May 17, 7:33 PM CDT | Severe Thunderstorm Warning | OUN | Baylor, Knox | 42 min |
| May 17, 8:00 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Baylor, Wichita | 45 min |
| May 17, 8:17 PM CDT | Severe Thunderstorm Warning | OUN | Archer, Wichita | 23 min |
| May 17, 8:19 PM CDT | Areal Flood Advisory | OUN | Baylor | 3 hr |
| May 17, 8:33 PM CDT | Areal Flood Advisory | OUN | Archer | 3 hr |
| May 17, 9:28 PM CDT | Areal Flood Advisory | OUN | Wichita | 3 hr |
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.