Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 533, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jun 18, 2017, 6:11 AM CDT for Lincoln County, Logan County, Oklahoma. It was in force for 49 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 18, 2017, 6:11 AM CDT (11:11 UTC)
- Expired
- Jun 18, 2017, 7:00 AM CDT
- In force
- 49 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Lincoln County, OK, Logan County, OK
The radar
The Norman radar (KTLX), 54 km from the middle of the area, began a volume at 11:11 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 18, 4:14 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 11.2 hours before the alert went out and 69 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
- 3025 J/kg
- Mixed-layer CIN
- -400 J/kg
- Mixed-layer LCL
- 1479 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 18, 2:26 AM CDT, 3 hours 45 minutes earlier.
Area forecast discussion, Jun 18, 2:26 AM CDT, 3 hours 45 minutes before
Area Forecast Discussion National Weather Service Norman OK 226 AM CDT Sun Jun 18 2017 .DISCUSSION... The focus is primarily in the short term with frontal passage tonight and ongoing convection. Cooler weather will arrive today, followed by a gradual warm up and a return of thunderstorm Latest water vapor imagery shows a fairly sharp shortwave trough traversing southern Minnesota and northern Iowa. This has forced a cold front southward into Oklahoma. Latest surface observations shows the front along a line from just south of Stillwater to near Cheyenne. Frontal lift of a still moderately unstable environment with at least a couple thousand Joules of MUCAPE has resulted in some thunderstorms. Although the stronger ascent will stay to the north and thus the more widespread convection should occur over Kansas, a couple of clusters and bowing segments are ongoing across north-central Oklahoma. These should continue to move southeast for the next few hours in a moist and unstable environment. Westward extent/growth should be tempered by warm capping mid-level layer as 700 mb temperature gradient is fairly steep east-to-west across the area. A marginal low-end severe threat will continue for the next few hours, although growing MLCIN should lessen the wind threat some, and storm mode generally won't favor significant hail sizes. Despite stronger forcing remaining north of the area, a couple of factors led us to retain at least low precipitation probabilities across the eastern portion of the area this morning. 1.) a very moist environment (nearly 2.0 inches PWAT) that is still modestly unstable, and 2.) outflow/cold pool strengthening as storms track southeast along periphery of ridge and edge of stronger mid-level capping. Thunderstorms should reform near the slowing cold front across south- central and southeast Oklahoma later today. Marginal deep layer shear for storm organization should preclude a higher end severe threat, but given magnitude of instability that should form as diabatic heating occurs late in the day, some severe thunderstorms will be possible. Convection should diminish and/or shift southeast by the early morning hours on Monday. For later in the week, we continue to be on the northeast side of mean ridging with occasional shortwaves moving through the northern and central Plains. Periodic thunderstorm chances are expected and timing of these will be refined in later forecasts. As it appears now, the best chance of storms should be across northern and perhaps eastern portions of the area on Wednesday night and late Friday into Saturday. BRB && .PRELIMINARY POINT TEMPS/POPS... Oklahoma City OK 77 63 87 65 / 20 10 0 0 Hobart OK 82 62 88 65 / 10 0 0 0 Wichita Falls TX 85 65 87 69 / 10 20 0 0 Gage OK 82 59 86 60 / 0 0 0 0 Ponca City OK 78 61 85 60 / 20 0 0 0 Durant OK 88 67 87 68 / 50 60 20 10 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...None. TX...None. && 10/12
Hazardous weather outlook, Jun 18, 5:20 AM CDT, 51 minutes before
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Special weather statement, Jun 18, 4:44 AM CDT, 1 hour 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
444 AM CDT SUN JUN 18 2017
OKZ007-012-181015-
Garfield OK-Grant OK-
444 AM CDT SUN JUN 18 2017
...SIGNIFICANT WEATHER ADVISORY FOR north central Garfield and
southern Grant Counties Until 515 AM CDT...
AT 442 AM CDT, a strong thunderstorm was located 5 miles west of
Jefferson, moving east at 35 MPH.
HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Locations impacted include...
Pond Creek, Lamont, Hunter and Jefferson.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Monitor the weather situation closely and be alert for threatening
weather conditions.
&&
LAT...LON 3672 9746 3660 9754 3648 9764 3664 9802
3681 9794
TIME...MOT...LOC 0942Z 289DEG 30KT 3671 9789
MAHALESpecial weather statement, Jun 18, 4:51 AM CDT, 1 hour 20 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE Norman OK 451 AM CDT SUN JUN 18 2017 OKZ012-013-181015- Garfield OK-Noble OK- 451 AM CDT SUN JUN 18 2017 ...SIGNIFICANT WEATHER ADVISORY FOR northeastern Garfield and west central Noble Counties Until 515 AM CDT... AT 449 AM CDT, a strong thunderstorm was located near Breckenridge, moving east at 35 MPH. HAZARDS INCLUDE... Hail up to the size of nickels... Wind gusts to 50 MPH... Locations impacted include... Enid, Garber, Breckenridge, Lucien and Hayward. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the weather situation closely and be alert for threatening weather conditions. && LAT...LON 3647 9783 3656 9774 3646 9728 3625 9747 TIME...MOT...LOC 0949Z 290DEG 30KT 3647 9772 MAHALE
Special weather statement, Jun 18, 5:10 AM CDT, 1 hour 1 minute before
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Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 9:46 PM CDT | Severe Thunderstorm Warning | OUN | Harper, Woods | 59 min |
| Jun 17, 10:35 PM CDT | Special Weather Statement | OUN | Woods | 25 min |
| Jun 17, 10:42 PM CDT | Severe Thunderstorm Warning | OUN | Woods | 13 min |
| Jun 17, 11:06 PM CDT | Special Weather Statement | OUN | Grant, Kay | 39 min |
| Jun 17, 11:40 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 50 min |
| Jun 17, 11:42 PM CDT | Special Weather Statement | OUN | Alfalfa | 33 min |
| Jun 17, 11:56 PM CDT | Special Weather Statement | OUN | Grant, Noble | 49 min |
| Jun 18, 12:02 AM CDT | Special Weather Statement | OUN | Grant | 28 min |
| Jun 18, 12:27 AM CDT | Special Weather Statement | OUN | Grant | 33 min |
| Jun 18, 12:48 AM CDT | Special Weather Statement | OUN | Kay | 42 min |
| Jun 18, 1:07 AM CDT | Severe Thunderstorm Warning | OUN | Garfield, Grant, Kay, Noble | 22 min |
| Jun 18, 1:11 AM CDT | Special Weather Statement | OUN | Grant | 34 min |
| Jun 18, 1:41 AM CDT | Special Weather Statement | OUN | Garfield, Noble | 34 min |
| Jun 18, 2:14 AM CDT | Special Weather Statement | OUN | Logan, Noble | 31 min |
| Jun 18, 2:33 AM CDT | Special Weather Statement | OUN | Major | 27 min |
| Jun 18, 2:41 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Noble, Payne | 49 min |
| Jun 18, 3:03 AM CDT | Severe Thunderstorm Warning | OUN | Garfield, Major | 42 min |
| Jun 18, 3:28 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Payne | 47 min |
| Jun 18, 3:39 AM CDT | Severe Thunderstorm Warning | OUN | Garfield, Kingfisher, Logan, Noble, Payne | 51 min |
| Jun 18, 4:10 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Oklahoma, Payne | 50 min |
| Jun 18, 4:44 AM CDT | Special Weather Statement | OUN | Grant | 31 min |
| Jun 18, 4:51 AM CDT | Special Weather Statement | OUN | Garfield | 24 min |
| Jun 18, 4:59 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 46 min |
| Jun 18, 5:01 AM CDT | Severe Thunderstorm Warning | OUN | Garfield, Noble | 44 min |
| Jun 18, 5:10 AM CDT | Special Weather Statement | OUN | Kay | 35 min |
| Jun 18, 5:43 AM CDT | Special Weather Statement | OUN | Payne | 47 min |
| Jun 18, 5:46 AM CDT | Special Weather Statement | OUN | Lincoln | 14 min |
| Jun 18, 5:59 AM CDT | Special Weather Statement | OUN | Payne | 31 min |
| Jun 18, 6:20 AM CDT | Special Weather Statement | OUN | Noble | 25 min |
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.