Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

March 12, 2021Washita County, Oklahoma

NWS Norman, OK issued this special weather statement at Mar 12, 2021, 6:33 PM CST for Washita County, Oklahoma. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Mar 12, 2021, 6:33 PM CST (00:33 UTC)
Expired
Mar 12, 2021, 7:00 PM CST
In force
27 min
Issued by
NWS Norman, OK

County Washita County, OK

The radar

The Altus AFB radar (KFDR), 113 km from the middle of the area, began a volume at 00:33 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 00:00Z, 0.6 hours before the alert went out and 163 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 00:00Z on 2021-03-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 910 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 00:00Z on 2021-03-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 116 square meters per square second.1939587897117Sfc1 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
910 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
646 m above ground
0-6 km bulk shear
63 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.2

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Mar 12, 5:35 PM CST, 58 minutes earlier.

Area forecast discussion, Mar 12, 5:35 PM CST, 58 minutes before
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Hazardous weather outlook, Mar 12, 12:26 PM CST, 6 hours 7 minutes before
Hazardous Weather Outlook
National Weather Service Norman OK
1226 PM CST Fri Mar 12 2021

OKZ004>048-050>052-TXZ083>090-131200-
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-
1226 PM CST Fri Mar 12 2021

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...
There is a slight risk of severe thunderstorms across most of
western Oklahoma and portions of western north Texas. Golf ball
size hail, damaging wind gusts over 60 mph are possible with the
stronger storms. The strongest storms are expected across parts
of southwestern Oklahoma and the adjacent area of western north
Texas. The most likely time for severe weather will be from late
this afternoon into the late evening hours.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

.Thunderstorms...

There is an enhanced risk of severe thunderstorms on Saturday,
generally along and west of a line from Woodward to Altus and
Vernon Texas. There is a slight and marginal risk of severe storms
east of the enhanced risk. The eastern border of this area is the
I-35 corridor.

Severe thunderstorms are expected to develop across the Texas
Panhandle during the mid afternoon as a strong storm system
approaches from the west. Severe thunderstorms are expected to
move into western Oklahoma and western north Texas by the late
afternoon and early evening. The stronger storms will be capable
of producing very large hail to the size of tennis balls, strong
damaging wind gusts over 70 mph, and a few tornadoes. Thunderstorm
intensity is expected to decrease as the storms move east during
the evening, but will still pose a damaging wind and hail threat.

.Flooding...
Heavy rainfall may occur this afternoon and again Saturday evening
and early Sunday morning could cause localized flooding. Areas
closer to the Kansas border are more likely to have the most rain
compared to areas farther south.

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

In the hours before

Special weather statement, Mar 12, 5:37 PM CST, 56 minutes before
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Local storm report, Mar 12, 5:49 PM CST, 44 minutes before
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Local storm report, Mar 12, 5:50 PM CST, 43 minutes before
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Special weather statement, Mar 12, 5:50 PM CST, 43 minutes before
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Special weather statement, Mar 12, 6:18 PM CST, 15 minutes before
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Special weather statement, Mar 12, 6:33 PM CST, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 12, 6:15 PM CSTAreal Flood AdvisoryOUNAlfalfa, Blaine, Dewey, Garfield, Grant, Major3 hr
Mar 12, 6:18 PM CSTSpecial Weather StatementOUNCuster42 min
Mar 12, 6:38 PM CSTFlash Flood WarningOUNAlfalfa, Garfield, Grant, Major3 hr
Mar 12, 6:45 PM CSTSpecial Weather StatementOUNBlaine45 min
Mar 12, 7:05 PM CSTSpecial Weather StatementOUNKay25 min
Mar 12, 7:18 PM CSTAreal Flood AdvisoryOUNKay, Noble3 hr
Mar 12, 7:31 PM CSTSpecial Weather StatementOUNBlaine29 min
Mar 12, 7:35 PM CSTAreal Flood AdvisoryOUNCuster3 hr
Mar 12, 8:00 PM CSTSpecial Weather StatementOUNBlaine30 min
Mar 12, 8:07 PM CSTSevere Thunderstorm WarningOUNBlaine, Custer, Kingfisher38 min
Mar 12, 8:40 PM CSTSpecial Weather StatementOUNNoble35 min
Mar 12, 8:42 PM CSTSevere Thunderstorm WarningOUNBlaine, Kingfisher48 min
Mar 12, 9:26 PM CSTSevere Thunderstorm WarningOUNKingfisher34 min
Mar 13, 1:19 AM CSTSpecial Weather StatementOUNHarmon26 min
Mar 13, 1:41 AM CSTSpecial Weather StatementOUNHarmon49 min
Mar 13, 2:31 AM CSTSpecial Weather StatementOUNJackson29 min
Mar 13, 4:42 AM CSTDense Fog AdvisoryOUNAlfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 22 more7 hr
Mar 13, 7:54 AM CSTRiver Flood AdvisoryOUNBlaine, Canadian13 hr
Mar 13, 12:02 PM CSTDense Fog AdvisoryOUNAlfalfa, Harper, Woods118 min
Mar 13, 2:08 PM CSTRiver Flood AdvisoryOUNBlaine, Caddo, Canadian, Custer39 hr
Mar 12, 9:16 PM CSTSevere Thunderstorm WarningOUNFoard44 min

Nearby

Special Weather Statements in Oklahoma, 2021Every special weather statement in 2021

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.