Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

April 9, 2021Marshall County, Oklahoma

NWS Norman, OK issued this special weather statement at Apr 9, 2021, 7:35 PM CDT for Marshall County, Oklahoma. It was in force for 25 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
Apr 9, 2021, 7:35 PM CDT (00:35 UTC)
Expired
Apr 9, 2021, 8:00 PM CDT
In force
25 min
Issued by
NWS Norman, OK

County Marshall County, OK

The radar

The Dallas/Ft Worth radar (KFWS), 155 km from the middle of the area, began a volume at 00:38 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

Fort Worth, TX (KFWD), launched 00:00Z, 0.6 hours before the alert went out and 126 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, Fort Worth, TX at 00:00Z on 2021-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3129 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, Fort Worth, TX at 00:00Z on 2021-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 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
3129 J/kg
Mixed-layer CIN
-45 J/kg
Mixed-layer LCL
1600 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
128 m²/s²
Significant tornado parameter
0.7
Supercell composite
11.7

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 Apr 9, 6:33 PM CDT, 1 hour 2 minutes earlier.

Area forecast discussion, Apr 9, 6:33 PM CDT, 1 hour 2 minutes before
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Hazardous weather outlook, Apr 9, 11:42 AM CDT, 7 hours 53 minutes before
Hazardous Weather Outlook
National Weather Service Norman OK
1142 AM CDT Fri Apr 9 2021

OKZ004>048-050>052-TXZ083>090-101645-
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-
1142 AM CDT Fri Apr 9 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...
Severe thunderstorms are possible this afternoon and evening,
mainly from 3 to 9 PM. The best chance for severe storms will be
across south central and southeastern Oklahoma, although
conditions will be favorable as far north as the Kansas border
east of Interstate 35. Large hail up to the size of baseballs and
damaging wind gusts up to 80 mph are the main impacts. There is a
low potential for tornadoes across extreme southeastern Oklahoma
mainly from 5 to 9 PM.

.Fire Weather...
Near critical fire weather conditions are possible this afternoon
across western Oklahoma and western north Texas.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across
central, southern, and southeastern Oklahoma should prepare for
severe weather operations between 3pm and 9pm today.

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

.Thunderstorms...
Thunderstorm chances return to the southern half of Oklahoma
Tuesday through Thursday, although severe weather chances appear
very low at this time.

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, Apr 9, 6:09 PM CDT, 1 hour 26 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
609 PM CDT Fri Apr 9 2021

OKZ026-092345-
Lincoln OK-
609 PM CDT Fri Apr 9 2021

...SIGNIFICANT WEATHER ADVISORY FOR southeastern Lincoln County Until
645 PM CDT...

AT 607 PM CDT, a strong thunderstorm was located near Prague, moving
east at 25 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...

Locations impacted include...
Prague.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the weather situation closely and be alert for threatening
weather conditions.

&&

LAT...LON 3546 9669 3547 9687 3558 9678 3561 9662
      3546 9663
TIME...MOT...LOC 2307Z 270DEG 23KT 3553 9673

Mahale
Local storm report, Apr 9, 6:20 PM CDT, 1 hour 15 minutes before
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Local storm report, Apr 9, 6:23 PM CDT, 1 hour 12 minutes before
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Local storm report, Apr 9, 6:34 PM CDT, 1 hour 1 minute before
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Special weather statement, Apr 9, 6:38 PM CDT, 57 minutes before
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Special weather statement, Apr 9, 6:58 PM CDT, 37 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 7:08 PM CDTSevere Thunderstorm WarningOUNMcClain, Pontotoc, Pottawatomie, Seminole52 min
Apr 9, 7:27 PM CDTSevere Thunderstorm WarningOUNGarvin, McClain, Pontotoc, Pottawatomie, Seminole33 min
Apr 9, 7:36 PM CDTSevere Thunderstorm WarningOUNCarter, Love, Marshall39 min
Apr 9, 7:39 PM CDTSevere Thunderstorm WarningOUNHughes, Seminole51 min
Apr 9, 7:51 PM CDTSevere Thunderstorm WarningOUNCoal, Hughes, Johnston, Murray, Pontotoc, Seminole54 min
Apr 9, 8:07 PM CDTSevere Thunderstorm WarningOUNLove, Marshall53 min
Apr 9, 8:11 PM CDTSevere Thunderstorm WarningOUNCarter, Coal, Johnston, Marshall, Murray, Pontotoc34 min
Apr 9, 8:38 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Coal, Hughes, Johnston, Marshall67 min
Apr 9, 9:15 PM CDTSevere Thunderstorm WarningOUNAtoka, Bryan, Marshall60 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.