Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 761, NWS Norman, OK

August 12, 2019Garfield County, Grant County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 12, 2019, 6:59 PM CDT for Garfield County, Grant County, Oklahoma. It was in force for 46 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 12, 2019, 6:59 PM CDT (23:59 UTC)
Expired
Aug 12, 2019, 7:45 PM CDT
In force
46 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
0.88 in
Wind
70.0 mph

Counties Garfield County, OK, Grant County, OK

The radar

The Vance AFB radar (KVNX), 35 km from the middle of the area, began a volume at 00:01 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

Topeka, KS (KTOP), launched 12:00Z, 12.0 hours before the alert went out and 328 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, Topeka, KS at 12:00Z on 2019-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 626 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, Topeka, KS at 12:00Z on 2019-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 181 square meters per square second.193958Sfc1 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
626 J/kg
Mixed-layer CIN
-361 J/kg
Mixed-layer LCL
1112 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
181 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

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 12, 6:13 PM CDT, 46 minutes earlier.

Area forecast discussion, Aug 12, 6:13 PM CDT, 46 minutes before
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Hazardous weather outlook, Aug 12, 12:49 PM CDT, 6 hours 10 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1249 PM CDT Mon Aug 12 2019

OKZ004>048-050>052-TXZ083>090-131800-
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-
1249 PM CDT Mon Aug 12 2019

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...Through Tonight...

.Heat...
Very hot and humid conditions are expected today with heat index
values reaching 100 to around 110 this afternoon.

.Thunderstorms...
There is a marginal risk of severe storms this afternoon and
evening across much of northern and western Oklahoma, generally
north of a line from Stillwater to Hinton to Hollis. Scattered
thunderstorms are expected to develop over portions of
northwestern Oklahoma this afternoon and track east across
northern Oklahoma this evening with storms gradually shifting
southeast overnight as a cold front moves southward across the
area. The primary threat will be damaging wind gusts up to 60 mph
with quarter size hail also possible with these storms.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday...

.Heat...
Although temperatures will not be as hot in northern and central
Oklahoma, heat index values of 100 to 110 are still expected in
southern Oklahoma and north Texas on Tuesday afternoon.

.Thunderstorms...
There is a marginal risk of severe thunderstorms across southern
Oklahoma and portions of western north Texas on Tuesday.
Otherwise, thunderstorms are possible on Wednesday and potentially
Friday night, but severe weather will be unlikely.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

JT/30

In the hours before

Special weather statement, Aug 12, 6:21 PM CDT, 38 minutes before
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Special weather statement, Aug 12, 6:32 PM CDT, 27 minutes before
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Special weather statement, Aug 12, 6:35 PM CDT, 24 minutes before
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Special weather statement, Aug 12, 6:47 PM CDT, 12 minutes before
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Special weather statement, Aug 12, 6:53 PM CDT, 6 minutes before
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Special weather statement, Aug 12, 6:56 PM CDT, 3 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 1:49 PM CDTExcessive Heat WarningOUNAtoka, Bryan, Carter, Coal, Garvin, Hughes and 10 more6 hr
Aug 12, 1:49 PM CDTHeat AdvisoryOUNAtoka, Bryan, Carter, Coal, Johnston, Love and 1 more30 hr
Aug 12, 3:04 PM CDTSpecial Weather StatementOUNRoger Mills26 min
Aug 12, 3:25 PM CDTSevere Thunderstorm WarningOUNEllis, Roger Mills50 min
Aug 12, 3:51 PM CDTSpecial Weather StatementOUNDewey39 min
Aug 12, 4:11 PM CDTSpecial Weather StatementOUNMajor64 min
Aug 12, 4:16 PM CDTSpecial Weather StatementOUNDewey29 min
Aug 12, 4:31 PM CDTSpecial Weather StatementOUNEllis59 min
Aug 12, 4:34 PM CDTSpecial Weather StatementOUNEllis41 min
Aug 12, 4:38 PM CDTSevere Thunderstorm WarningOUNDewey, Major, Woodward52 min
Aug 12, 4:43 PM CDTSevere Thunderstorm WarningOUNDewey, Ellis, Roger Mills47 min
Aug 12, 4:50 PM CDTSevere Thunderstorm WarningOUNEllis40 min
Aug 12, 5:09 PM CDTSevere Thunderstorm WarningOUNEllis51 min
Aug 12, 5:14 PM CDTSpecial Weather StatementOUNWoodward46 min
Aug 12, 5:17 PM CDTSpecial Weather StatementOUNMajor43 min
Aug 12, 5:27 PM CDTSevere Thunderstorm WarningOUNBlaine, Garfield, Kingfisher, Major63 min
Aug 12, 5:36 PM CDTSpecial Weather StatementOUNMajor54 min
Aug 12, 5:38 PM CDTSevere Thunderstorm WarningOUNWoodward47 min
Aug 12, 5:44 PM CDTSpecial Weather StatementOUNEllis46 min
Aug 12, 5:49 PM CDTSpecial Weather StatementOUNKay26 min
Aug 12, 6:02 PM CDTSpecial Weather StatementOUNEllis28 min
Aug 12, 6:08 PM CDTSevere Thunderstorm WarningOUNAlfalfa, Garfield, Major52 min
Aug 12, 6:10 PM CDTSpecial Weather StatementOUNWoods65 min
Aug 12, 6:13 PM CDTSpecial Weather StatementOUNKay32 min
Aug 12, 6:15 PM CDTSevere Thunderstorm WarningOUNKay31 min
Aug 12, 6:20 PM CDTSevere Thunderstorm WarningOUNMajor, Woods, Woodward22 min
Aug 12, 6:21 PM CDTSpecial Weather StatementOUNHarper54 min
Aug 12, 6:32 PM CDTSpecial Weather StatementOUNEllis43 min
Aug 12, 6:35 PM CDTSpecial Weather StatementOUNKay25 min
Aug 12, 6:47 PM CDTSpecial Weather StatementOUNWoodward28 min
Aug 12, 6:48 PM CDTSevere Thunderstorm WarningOUNKay42 min
Aug 12, 6:53 PM CDTSpecial Weather StatementOUNGrant37 min
Aug 12, 6:56 PM CDTSpecial Weather StatementOUNKay49 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2019Every severe thunderstorm warning in 2019

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.