Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 838, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 22, 2017, 7:41 PM CDT for Oklahoma County, Oklahoma. It was in force for 34 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
- Aug 22, 2017, 7:41 PM CDT (00:41 UTC)
- Expired
- Aug 22, 2017, 8:15 PM CDT
- In force
- 34 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Oklahoma County, OK
The radar
The Norman radar (KTLX), 27 km from the middle of the area, began a volume at 00:43 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 00:00Z, 0.7 hours before the alert went out and 37 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
- 1764 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 1641 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 36 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 Aug 22, 6:15 PM CDT, 1 hour 26 minutes earlier.
Area forecast discussion, Aug 22, 6:15 PM CDT, 1 hour 26 minutes before
Area Forecast Discussion National Weather Service Norman OK 615 PM CDT Tue Aug 22 2017 .AVIATION... Widespread showers and thunderstorms will impact most sites overnight. Heaviest activity will create temporary MVFR conditions this evening. Ceililngs may drop into MVFR cat late tonight across central into southern sections of the area before skies clear by mid- morning. Northeast winds of 8 to 12kts will remain with a shift back to the southeast at both GAG/WWR by Wednesday afternoon. 30 && .PREV DISCUSSION... /ISSUED 234 PM CDT Tue Aug 22 2017/ .DISCUSSION... Cold front continues to slowly move south this afternoon, and the afternoon convection has already developed along the front in southwest Oklahoma and the southeast Texas panhandle. Despite decent instability, wind shear is very low, so although some storms may briefly become strong or marginally severe, organized severe weather is unlikely. The primary issue will be locally heavy rainfall/flooding with the combination of high precipitable water and slow movement. The special 17Z OUN sounding recorded a precipitable water content of 1.65 inches, just under the 90th percentile for this time of year. Storm chances continue through tomorrow, mainly close to the frontal zone in the south. Return moisture leads to some additional storm chances tomorrow night into Friday, mainly west. Then attention shifts to the tropical system advertised by the models to move inland on the Texas Gulf Coast late Friday or Saturday. It still remains a question how far north the moisture will push through Texas or if we will remain in a more subsident region, so there is quite a bit of uncertainty later in this forecast period. Temperatures will remain below average for this time of the year. && .PRELIMINARY POINT TEMPS/POPS... Oklahoma City OK 68 85 62 84 / 50 10 10 10 Hobart OK 70 86 64 86 / 60 30 10 20 Wichita Falls TX 72 87 70 87 / 60 40 20 20 Gage OK 63 86 61 85 / 20 10 10 20 Ponca City OK 61 85 59 84 / 20 0 0 0 Durant OK 72 87 69 85 / 60 40 10 10 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...None. TX...None. &&
Hazardous weather outlook, Aug 22, 5:23 PM CDT, 2 hours 18 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 523 PM CDT Tue Aug 22 2017 OKZ004>048-050>052-TXZ083>090-232230- 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- 523 PM CDT Tue Aug 22 2017 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Through Tonight... .Thunderstorms... Isolated to numerous thunderstorms will continue across central and southern Oklahoma and adjacent parts of northern Texas through tonight. Some strong to severe storms are possible with a threat of damaging winds up to 70 mph and hail up to the size of half dollars. Severe potential will decrease after 10 pm this evening. .Heavy Rainfall/Flooding... Localized heavy rainfall is possible now through early Wednesday morning across much of Oklahoma and north Texas. The heaviest rainfall is expected over portions of southwestern Oklahoma. This could lead to flash flooding. .DAYS TWO THROUGH SEVEN...Wednesday through Monday... .Thunderstorms... At least a low chance of thunderstorms will be possible each day Wednesday through next Monday. Strong winds and locally heavy rainfall may be possible with storms during the next several days. Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook. MBS
In the hours before
Special weather statement, Aug 22, 7:02 PM CDT, 39 minutes before
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</html>Local storm report, Aug 22, 7:03 PM CDT, 38 minutes before
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</html>Special weather statement, Aug 22, 7:03 PM CDT, 38 minutes before
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</html>Local storm report, Aug 22, 7:10 PM CDT, 31 minutes before
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</html>Local storm report, Aug 22, 7:33 PM CDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
733 PM CDT TUE AUG 22 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0726 PM HAIL 7 NW OKLAHOMA CITY 35.54N 97.60W
08/22/2017 E1.00 INCH OKLAHOMA OK BROADCAST MEDIA
MAY AVE AND HEFNER BLVD. VIA KFOR
&&
DWThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 7:02 PM CDT | Special Weather Statement | OUN | Pottawatomie | 28 min |
| Aug 22, 7:03 PM CDT | Special Weather Statement | OUN | Blaine | 27 min |
| Aug 22, 7:11 PM CDT | Severe Thunderstorm Warning | OUN | Oklahoma | 34 min |
| Aug 22, 7:14 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie | 31 min |
| Aug 22, 7:18 PM CDT | Areal Flood Advisory | OUN | Pottawatomie | 117 min |
| Aug 22, 7:35 PM CDT | Severe Thunderstorm Warning | OUN | Canadian | 40 min |
| Aug 22, 7:47 PM CDT | Areal Flood Advisory | OUN | Blaine, Caddo, Canadian, Custer, Dewey | 3 hr |
| Aug 22, 7:50 PM CDT | Areal Flood Advisory | OUN | Canadian | 3 hr |
| Aug 22, 7:54 PM CDT | Special Weather Statement | OUN | Hughes | 36 min |
| Aug 22, 8:02 PM CDT | Special Weather Statement | OUN | Cleveland | 28 min |
| Aug 22, 8:25 PM CDT | Areal Flood Advisory | OUN | Cleveland | 2 hr |
| Aug 22, 8:29 PM CDT | Areal Flood Advisory | OUN | Hughes, Seminole | 2 hr |
| Aug 22, 8:44 PM CDT | Flash Flood Warning | OUN | Cleveland | 3 hr |
| Aug 22, 10:44 PM CDT | Areal Flood Advisory | OUN | Cotton, Jefferson | 3 hr |
| Aug 22, 11:26 PM CDT | Areal Flood Advisory | OUN | Lincoln | 3 hr |
| Aug 23, 12:28 AM CDT | Areal Flood Advisory | OUN | Carter, Johnston, Love, Murray | 3 hr |
| Aug 23, 3:33 AM CDT | Areal Flood Advisory | OUN | Bryan, Marshall | 3 hr |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2017Every severe thunderstorm warning in 2017
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.