Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 550, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Aug 16, 2018, 6:09 PM CDT for Seminole County, Oklahoma. It was in force for 28 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 16, 2018, 6:09 PM CDT (23:09 UTC)
- Expired
- Aug 16, 2018, 6:37 PM CDT
- In force
- 28 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County Seminole County, OK
The radar
The Norman radar (KTLX), 63 km from the middle of the area, began a volume at 23:13 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 12:00Z, 11.2 hours before the alert went out and 72 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
- 788 J/kg
- Mixed-layer CIN
- -151 J/kg
- Mixed-layer LCL
- 1830 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 56 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 16, 2:39 PM CDT, 3 hours 30 minutes earlier.
Area forecast discussion, Aug 16, 2:39 PM CDT, 3 hours 30 minutes before
Area Forecast Discussion
National Weather Service Norman OK
239 PM CDT Thu Aug 16 2018
.DISCUSSION...
Thunderstorms will continue to develop and move across portions of
the area the rest of this afternoon/evening as an MCV continues to
move across the region. The airmass is unstable with 1500-3000+ J/kg
of CAPE. Strong to severe storms will continue to be possible
through mid-evening. Heavy rain will also be possible, which will be
especially problematic for those areas that have already received a
lot of rain over the last few days. A flood watch was issued earlier
today.
Some showers/storms may remain possible overnight into Friday across
portions of the area. Models show a boundary moving south across
parts of the area tonight and Friday. With heating and the boundary,
some isolated to scattered storms could develop Friday afternoon and
evening. Some of these storms could become strong to severe with
damaging wind gusts and heavy rain the primary concerns. Meanwhile,
other storms could develop west of the fa then move across the area
Friday night into Saturday as mid level disturbance moves through
the flow.
The highest chances for rain will be Saturday night in Sunday.
Storms are expected to develop in the High Plains Saturday as an
upper wave moves across the Rockies. These storms will then continue
to develop and move into the fa as the upper wave moves into the
Plains. Rain chances will continue Sunday night into Monday morning
as the upper wave continues to move across the Plains. Strong to
severe storms will be possible this weekend with damaging wind gusts
the primary concerns. Heay rain and flooding will also continue to
be a concern over the weekend.
&&
.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK 73 93 73 89 / 30 20 30 20
Hobart OK 72 95 72 89 / 20 20 40 30
Wichita Falls TX 75 97 74 96 / 30 20 30 30
Gage OK 68 91 68 86 / 20 10 30 30
Ponca City OK 71 92 67 91 / 30 20 10 10
Durant OK 76 96 74 94 / 20 30 30 30
&&
.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Flood Watch until 9 PM CDT this evening for OKZ007-008-012-013-
018>020-024>030.
TX...None.
&&
10/25Hazardous weather outlook, Aug 16, 5:10 PM CDT, 59 minutes before
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Local storm report, Aug 16, 4:07 PM CDT, 2 hours 2 minutes before
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</html>Local storm report, Aug 16, 4:39 PM CDT, 1 hour 30 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 |
|---|---|---|---|---|
| Aug 16, 11:06 AM CDT | Flood Watch | OUN | Canadian, Cleveland, Garfield, Grady, Grant, Kay and 8 more | 7 hr |
| Aug 16, 12:25 PM CDT | Areal Flood Advisory | OUN | Blaine, Custer, Dewey | 3 hr |
| Aug 16, 1:32 PM CDT | Special Weather Statement | OUN | Kingfisher | 28 min |
| Aug 16, 1:33 PM CDT | Areal Flood Advisory | OUN | Kingfisher | 3 hr |
| Aug 16, 1:45 PM CDT | Special Weather Statement | OUN | Noble | 30 min |
| Aug 16, 1:47 PM CDT | Special Weather Statement | OUN | Alfalfa | 28 min |
| Aug 16, 2:07 PM CDT | Areal Flood Advisory | OUN | Garfield, Kingfisher, Logan, Noble, Payne | 4 hr |
| Aug 16, 2:08 PM CDT | Special Weather Statement | OUN | Grant | 37 min |
| Aug 16, 2:10 PM CDT | Special Weather Statement | OUN | Garfield | 35 min |
| Aug 16, 2:17 PM CDT | Severe Thunderstorm Warning | OUN | Garfield, Logan, Noble | 43 min |
| Aug 16, 2:30 PM CDT | Severe Thunderstorm Warning | OUN | Grant | 45 min |
| Aug 16, 2:40 PM CDT | Areal Flood Advisory | OUN | Noble, Payne | 3 hr |
| Aug 16, 2:48 PM CDT | Special Weather Statement | OUN | Payne | 27 min |
| Aug 16, 2:49 PM CDT | Flash Flood Warning | OUN | Garfield, Logan, Noble, Payne | 3 hr |
| Aug 16, 2:59 PM CDT | Severe Thunderstorm Warning | OUN | Payne | 46 min |
| Aug 16, 3:09 PM CDT | Severe Thunderstorm Warning | OUN | Grant, Kay | 51 min |
| Aug 16, 3:32 PM CDT | Severe Thunderstorm Warning | OUN | Kay, Noble | 43 min |
| Aug 16, 3:45 PM CDT | Severe Thunderstorm Warning | OUN | Payne | 30 min |
| Aug 16, 5:52 PM CDT | Special Weather Statement | OUN | Okfuskee | 23 min |
| Aug 16, 6:40 PM CDT | Special Weather Statement | OUN | Pottawatomie, Seminole | 35 min |
| Aug 16, 6:50 PM CDT | Areal Flood Advisory | OUN | Pottawatomie, Seminole | 3 hr |
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.