Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 332, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jun 12, 2018, 5:01 PM CDT for Harper County, Woods County, Oklahoma. It was in force for 44 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 12, 2018, 5:01 PM CDT (22:01 UTC)
- Expired
- Jun 12, 2018, 5:45 PM CDT
- In force
- 44 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.75 in
- Wind
- 60.0 mph
Counties Harper County, OK, Woods County, OK
The radar
The Vance AFB radar (KVNX), 102 km from the middle of the area, began a volume at 22:04 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 12, 4:40 PM CDT | Severe Thunderstorm Watch | SPC | 9 hr |
The nearest sounding before it
Dodge City, (KDDC), launched 12:00Z, 10.0 hours before the alert went out and 124 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
- 1598 J/kg
- Mixed-layer CIN
- -322 J/kg
- Mixed-layer LCL
- 1042 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 96 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.3
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 12, 3:27 PM CDT, 1 hour 34 minutes earlier.
Area forecast discussion, Jun 12, 3:27 PM CDT, 1 hour 34 minutes before
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</html>Hazardous weather outlook, Jun 12, 12:40 PM CDT, 4 hours 21 minutes before
Hazardous Weather Outlook National Weather Service Norman OK 1240 PM CDT Tue Jun 12 2018 OKZ004>048-050>052-TXZ083>090-131745- 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- 1240 PM CDT Tue Jun 12 2018 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... A few strong to severe thunderstorms will occur this afternoon mainly across parts of central and southern Oklahoma. Tonight, there is a Slight Risk of severe storms across northwestern Oklahoma with a Marginal Risk across much of Oklahoma and north Texas. Location... The Slight Risk area is northwest of a line from Sayre and Watonga, to Enid and Blackwell, Oklahoma. The Marginal Risk area is north of a line from Benjamin to Archer City, Texas. Timing... Severe storms are possible anytime this afternoon and tonight, but the most likely time for severe storms will be after 9 pm this evening. Impacts... Hail up to the size of golf balls and wind gusts to 65 mph are possible with any of the afternoon and early evening storms. As the night progresses, damaging wind gusts up to 70 mph and hail up to the size of quarters will become the main concerns. Very heavy rainfall, flash flooding, and frequent lightning are additional concerns with thunderstorms this afternoon and tonight. Discussion... Isolated to scattered storms will occur this afternoon near a residual outflow boundary central and southern Oklahoma as well as north Texas. Large hail, strong winds, heavy rainfall, and frequent lightning are the main concerns with these storms. The greatest potential for storms will be late this evening and overnight. Storms are expected to develop in the High Plains of Colorado, western Kansas, and the Panhandles late this afternoon and early evening. These storms are then expected to develop into one or more thunderstorm complexes that will move across mainly western and northern Oklahoma late this evening and overnight into Wednesday morning. Thunderstorms will remain possible into the daylight hours Wednesday, but the potential for severe storms is expected to diminish early Wednesday morning. .SPOTTER AND EMERGENCY MANAGEMENT STATEMENT... Storm spotter groups and emergency management personnel across the risk areas should prepare for severe weather operations this afternoon into early Wednesday. .DAYS TWO THROUGH SEVEN...Wednesday through Monday... .Thunderstorms... Storms will continue across portions of the area Wednesday with rain chances ending Wednesday afternoon. Gusty winds could be possible with the strongest storms but organized severe weather is not expected on Wednesday. Thunderstorm chances will return Sunday and continue into early next week. Heavy rain will be a concern. 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, Jun 12, 11:59 AM CDT, 5 hours 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 1159 AM CDT TUE JUN 12 2018 OKZ028-030-031-040>042-121745- Pottawatomie OK-Garvin OK-Pontotoc OK-McClain OK-Seminole OK- Murray OK- 1159 AM CDT TUE JUN 12 2018 ...SIGNIFICANT WEATHER ADVISORY FOR south central Pottawatomie... northeastern Garvin...northwestern Pontotoc...southeastern McClain... southwestern Seminole and north central Murray Counties Until 1245 PM CDT... AT 1156 AM CDT, strong thunderstorms were along a line extending from 3 miles southeast of Maud to 3 miles south of Wanette, moving south at 25 MPH. HAZARDS INCLUDE... Hail up to one-half inch diameter... Wind gusts to 40 MPH... Minor flooding in areas of poor drainage... Locations impacted include... Ada, Stratford, Konawa, Byng, Bowlegs, Asher, Wanette, Byars, Fitzhugh, St. Louis and Vanoss. LAT...LON 3474 9661 3454 9710 3493 9708 3519 9667 TIME...MOT...LOC 1656Z 0DEG 23KT 3509 9674 3492 9701 WR
Special weather statement, Jun 12, 12:01 PM CDT, 5 hours before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
1201 PM CDT TUE JUN 12 2018
OKZ023-038-121730-
Caddo OK-Comanche OK-
1201 PM CDT TUE JUN 12 2018
...SIGNIFICANT WEATHER ADVISORY FOR southeastern Caddo and
northeastern Comanche Counties Until 1230 PM CDT...
AT 1159 AM CDT, a strong thunderstorm was located 4 miles northwest
of Cyril, moving south at 15 MPH.
HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 40 MPH...
Minor flooding in areas of poor drainage...
Locations impacted include...
Elgin, Apache, Fletcher, Cyril, Sterling, Cement, Lake Ellsworth,
northeastern Fort Sill and Stecker.
This includes Interstate 44 between mile markers 47 and 66.
LAT...LON 3473 9840 3503 9834 3502 9812 3477 9809
3471 9809
TIME...MOT...LOC 1659Z 2DEG 11KT 3496 9824
WRSpecial weather statement, Jun 12, 12:06 PM CDT, 4 hours 55 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 1206 PM CDT TUE JUN 12 2018 OKZ028>030-121730- Pottawatomie OK-Cleveland OK-McClain OK- 1206 PM CDT TUE JUN 12 2018 ...SIGNIFICANT WEATHER ADVISORY FOR west central Pottawatomie... southeastern Cleveland and central McClain Counties Until 1230 PM CDT... AT 1206 PM CDT, strong thunderstorms were along a line extending from 3 miles east of Lake Thunderbird to near Noble, moving southeast at 10 MPH. HAZARDS INCLUDE... Wind gusts over 50 MPH... Locations impacted include... Southeastern Norman, Purcell, Noble, Slaughterville, Lexington, Pink, Tribbey, Etowah, Macomb, southern Lake Thunderbird and Little Axe. LAT...LON 3511 9695 3496 9732 3515 9743 3531 9710 TIME...MOT...LOC 1706Z 335DEG 10KT 3522 9717 3516 9741 WR
Special weather statement, Jun 12, 12:39 PM CDT, 4 hours 22 minutes before
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</html>Special weather statement, Jun 12, 3:11 PM CDT, 1 hour 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
311 PM CDT TUE JUN 12 2018
TXZ087-122045-
Knox TX-
311 PM CDT TUE JUN 12 2018
...SIGNIFICANT WEATHER ADVISORY FOR northern Knox County Until 345 PM
CDT...
AT 308 PM CDT, a strong thunderstorm was located near Gilliland,
moving west at 25 MPH.
HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...
Frequent cloud to ground lightning...
Locations impacted include...
Gilliland, Vera and Truscott.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3382 9983 3383 9981 3382 9980 3380 9974
3380 9970 3381 9970 3381 9966 3379 9960
3378 9953 3375 9948 3358 9958 3371 9990
TIME...MOT...LOC 2008Z 109DEG 21KT 3372 9966
03Special weather statement, Jun 12, 4:50 PM CDT, 11 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 450 PM CDT TUE JUN 12 2018 OKZ004-005-122215- Harper OK-Woods OK- 450 PM CDT TUE JUN 12 2018 ...SIGNIFICANT WEATHER ADVISORY FOR northeastern Harper and northwestern Woods Counties Until 515 PM CDT... AT 449 PM CDT, a strong thunderstorm was located 8 miles southwest of Buttermilk, moving southeast at 10 MPH. HAZARDS INCLUDE... Hail up to one-half inch diameter... Wind gusts to 50 MPH... LAT...LON 3700 9922 3683 9934 3695 9965 3700 9961 TIME...MOT...LOC 2149Z 299DEG 7KT 3704 9946 SIX
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 7:36 PM CDT | Special Weather Statement | OUN | Major | 24 min |
| Jun 11, 7:41 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Major, Woods | 22 min |
| Jun 12, 6:16 AM CDT | Severe Thunderstorm Warning | OUN | Payne | 59 min |
| Jun 12, 7:02 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Payne | 43 min |
| Jun 12, 7:32 AM CDT | Special Weather Statement | OUN | Lincoln | 28 min |
| Jun 12, 8:01 AM CDT | Special Weather Statement | OUN | Lincoln | 29 min |
| Jun 12, 8:21 AM CDT | Special Weather Statement | OUN | Hughes, Seminole | 39 min |
| Jun 12, 8:33 AM CDT | Special Weather Statement | OUN | Lincoln | 27 min |
| Jun 12, 8:39 AM CDT | Special Weather Statement | OUN | Payne | 36 min |
| Jun 12, 8:50 AM CDT | Areal Flood Advisory | OUN | Lincoln, Payne | 3 hr |
| Jun 12, 9:15 AM CDT | Special Weather Statement | OUN | Payne | 30 min |
| Jun 12, 9:16 AM CDT | Special Weather Statement | OUN | Hughes | 29 min |
| Jun 12, 9:38 AM CDT | Flash Flood Warning | OUN | Lincoln, Logan, Payne | 105 min |
| Jun 12, 9:43 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan | 32 min |
| Jun 12, 9:56 AM CDT | Special Weather Statement | OUN | Hughes | 49 min |
| Jun 12, 9:57 AM CDT | Areal Flood Advisory | OUN | Hughes | 3 hr |
| Jun 12, 10:08 AM CDT | Special Weather Statement | OUN | Oklahoma | 37 min |
| Jun 12, 10:19 AM CDT | Areal Flood Advisory | OUN | Oklahoma | 65 min |
| Jun 12, 10:26 AM CDT | Special Weather Statement | OUN | Oklahoma | 34 min |
| Jun 12, 10:41 AM CDT | Areal Flood Advisory | OUN | Cleveland, Oklahoma | 64 min |
| Jun 12, 10:55 AM CDT | Special Weather Statement | OUN | Canadian | 50 min |
| Jun 12, 11:01 AM CDT | Special Weather Statement | OUN | Pottawatomie | 44 min |
| Jun 12, 11:35 AM CDT | Special Weather Statement | OUN | Cleveland | 25 min |
| Jun 12, 11:59 AM CDT | Special Weather Statement | OUN | Pontotoc | 46 min |
| Jun 12, 12:01 PM CDT | Special Weather Statement | OUN | Comanche | 29 min |
| Jun 12, 12:06 PM CDT | Special Weather Statement | OUN | Cleveland | 24 min |
| Jun 12, 12:07 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Pottawatomie | 53 min |
| Jun 12, 12:26 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, McClain, Pontotoc, Pottawatomie | 34 min |
| Jun 12, 12:39 PM CDT | Special Weather Statement | OUN | McClain | 51 min |
| Jun 12, 4:50 PM CDT | Special Weather Statement | OUN | Harper | 25 min |
| Jun 12, 5:43 PM CDT | Severe Thunderstorm Warning | OUN | Harper | 62 min |
| Jun 12, 5:52 PM CDT | Areal Flood Advisory | OUN | Harper, Woods | 3 hr |
| Jun 12, 6:10 PM CDT | Special Weather Statement | OUN | Harper | 35 min |
| Jun 12, 6:29 PM CDT | Severe Thunderstorm Warning | OUN | Harper | 61 min |
| Jun 12, 6:33 PM CDT | Areal Flood Advisory | OUN | Harper | 3 hr |
| Jun 12, 3:11 PM CDT | Special Weather Statement | OUN | Knox | 34 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2018Every severe thunderstorm warning in 2018
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.