Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 550, NWS Norman, OK

August 16, 2018Seminole County, Oklahoma

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.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 12:00Z on 2018-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 788 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 2018-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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.
&&

10/25
Hazardous weather outlook, Aug 16, 5:10 PM CDT, 59 minutes before
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In the hours before

Local storm report, Aug 16, 4:07 PM CDT, 2 hours 2 minutes before
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Local storm report, Aug 16, 4:10 PM CDT, 1 hour 59 minutes before
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Local storm report, Aug 16, 4:39 PM CDT, 1 hour 30 minutes before
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Local storm report, Aug 16, 4:41 PM CDT, 1 hour 28 minutes before
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Local storm report, Aug 16, 5:22 PM CDT, 47 minutes before
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Special weather statement, Aug 16, 5:52 PM CDT, 17 minutes before
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The office that day

Everything else NWS Norman, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 16, 11:06 AM CDTFlood WatchOUNCanadian, Cleveland, Garfield, Grady, Grant, Kay and 8 more7 hr
Aug 16, 12:25 PM CDTAreal Flood AdvisoryOUNBlaine, Custer, Dewey3 hr
Aug 16, 1:32 PM CDTSpecial Weather StatementOUNKingfisher28 min
Aug 16, 1:33 PM CDTAreal Flood AdvisoryOUNKingfisher3 hr
Aug 16, 1:45 PM CDTSpecial Weather StatementOUNNoble30 min
Aug 16, 1:47 PM CDTSpecial Weather StatementOUNAlfalfa28 min
Aug 16, 2:07 PM CDTAreal Flood AdvisoryOUNGarfield, Kingfisher, Logan, Noble, Payne4 hr
Aug 16, 2:08 PM CDTSpecial Weather StatementOUNGrant37 min
Aug 16, 2:10 PM CDTSpecial Weather StatementOUNGarfield35 min
Aug 16, 2:17 PM CDTSevere Thunderstorm WarningOUNGarfield, Logan, Noble43 min
Aug 16, 2:30 PM CDTSevere Thunderstorm WarningOUNGrant45 min
Aug 16, 2:40 PM CDTAreal Flood AdvisoryOUNNoble, Payne3 hr
Aug 16, 2:48 PM CDTSpecial Weather StatementOUNPayne27 min
Aug 16, 2:49 PM CDTFlash Flood WarningOUNGarfield, Logan, Noble, Payne3 hr
Aug 16, 2:59 PM CDTSevere Thunderstorm WarningOUNPayne46 min
Aug 16, 3:09 PM CDTSevere Thunderstorm WarningOUNGrant, Kay51 min
Aug 16, 3:32 PM CDTSevere Thunderstorm WarningOUNKay, Noble43 min
Aug 16, 3:45 PM CDTSevere Thunderstorm WarningOUNPayne30 min
Aug 16, 5:52 PM CDTSpecial Weather StatementOUNOkfuskee23 min
Aug 16, 6:40 PM CDTSpecial Weather StatementOUNPottawatomie, Seminole35 min
Aug 16, 6:50 PM CDTAreal Flood AdvisoryOUNPottawatomie, Seminole3 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.