Alert archive / Oklahoma / Special Weather Statements in 2017
Special Weather Statement, NWS Norman, OK
NWS Norman, OK issued this special weather statement at Aug 22, 2017, 3:07 PM CDT for Harmon County, Oklahoma. It was in force for 23 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
- Aug 22, 2017, 3:07 PM CDT (20:07 UTC)
- Expired
- Aug 22, 2017, 3:30 PM CDT
- In force
- 23 min
- Issued by
- NWS Norman, OK
County Harmon County, OK
The radar
The Altus AFB radar (KFDR), 107 km from the middle of the area, began a volume at 20:10 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
Amarillo Airport, TX (KAMA), launched 12:00Z, 8.1 hours before the alert went out and 165 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
- 485 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 1217 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -32 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Aug 22, 2:34 PM CDT, 33 minutes earlier.
Area forecast discussion, Aug 22, 2:34 PM CDT, 33 minutes before
Area Forecast Discussion National Weather Service Norman OK 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, 12:00 PM CDT, 3 hours 7 minutes before
Hazardous Weather Outlook National Weather Service Norman OK 1200 pM CDT Tue Aug 22 2017 OKZ004>048-050>052-TXZ083>090-231015- 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- 1200 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...Today and Tonight... .Thunderstorms... Thunderstorm chances increase this afternoon through early evening across central and southern Oklahoma and adjacent parts of northern Texas when a cold front passes. Strong to severe storms will be possible with a threat of damaging winds and hail up to the size of half dollars. .Heavy Rainfall... Localized heavy rainfall is possible late this afternoon through early Wednesday morning along and south of interstate 40. 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 this week. Chances will likely increase by Saturday morning across northwestern and central Oklahoma. 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, Aug 22, 3:07 PM CDT, 0 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 307 PM CDT TUE AUG 22 2017 OKZ033-034-222030- Harmon OK-Greer OK- 307 PM CDT TUE AUG 22 2017 ...SIGNIFICANT WEATHER ADVISORY FOR northwestern Harmon and west central Greer Counties Until 330 PM CDT... AT 305 PM CDT, a strong thunderstorm was located 6 miles west of Vinson, moving northeast at 10 MPH. HAZARDS INCLUDE... Hail up to the size of nickels... Wind gusts to 50 MPH... LAT...LON 3482 10000 3503 10000 3503 9984 3489 9979 TIME...MOT...LOC 2005Z 242DEG 9KT 3492 9996 ..speg.
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 7:20 PM CDT | Special Weather Statement | OUN | Beckham | 25 min |
| Aug 22, 3:46 PM CDT | Special Weather Statement | OUN | Greer | 29 min |
| Aug 22, 4:02 PM CDT | Special Weather Statement | OUN | Harmon | 28 min |
| Aug 22, 4:05 PM CDT | Special Weather Statement | OUN | Garfield | 25 min |
| Aug 22, 4:18 PM CDT | Special Weather Statement | OUN | Washita | 27 min |
| Aug 22, 4:50 PM CDT | Special Weather Statement | OUN | Beckham, Custer, Washita | 25 min |
| Aug 22, 5:03 PM CDT | Special Weather Statement | OUN | Garfield, Noble | 27 min |
| Aug 22, 5:07 PM CDT | Areal Flood Advisory | OUN | Beckham | 113 min |
| Aug 22, 5:17 PM CDT | Areal Flood Advisory | OUN | Garfield | 118 min |
| Aug 22, 5:21 PM CDT | Special Weather Statement | OUN | Custer | 24 min |
| Aug 22, 5:28 PM CDT | Severe Thunderstorm Warning | OUN | Custer | 32 min |
| Aug 22, 5:32 PM CDT | Special Weather Statement | OUN | Garfield | 28 min |
| Aug 22, 5:35 PM CDT | Special Weather Statement | OUN | Coal | 25 min |
| Aug 22, 5:55 PM CDT | Special Weather Statement | OUN | Logan | 35 min |
| Aug 22, 6:02 PM CDT | Areal Flood Advisory | OUN | Custer | 118 min |
| Aug 22, 6:20 PM CDT | Special Weather Statement | OUN | Blaine | 25 min |
| Aug 22, 6:24 PM CDT | Special Weather Statement | OUN | Pottawatomie | 36 min |
| Aug 22, 6:35 PM CDT | Special Weather Statement | OUN | Oklahoma | 25 min |
| Aug 22, 6:42 PM CDT | Severe Thunderstorm Warning | OUN | Oklahoma | 33 min |
| Aug 22, 6:44 PM CDT | Severe Thunderstorm Warning | OUN | Blaine | 46 min |
| Aug 22, 6:50 PM CDT | Special Weather Statement | OUN | Canadian | 25 min |
| Aug 22, 6:59 PM CDT | Flash Flood Warning | OUN | Oklahoma | 4 hr |
| Aug 22, 4:28 PM CDT | Severe Thunderstorm Warning | OUN | Hardeman | 32 min |
Nearby
Special Weather Statements in Oklahoma, 2017Every special weather statement 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.