Alert archive / Oklahoma / Special Weather Statements in 2021

Special Weather Statement, NWS Norman, OK

July 27, 2021Johnston County, Oklahoma

NWS Norman, OK issued this special weather statement at Jul 27, 2021, 4:45 PM CDT for Johnston County, Oklahoma. It was in force for 30 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: Jul 27, 2021, 4:45 PM CDT (21:45 UTC)
Expired: Jul 27, 2021, 5:15 PM CDT
In force: 30 min
Issued by: NWS Norman, OK

County Johnston County, OK

The radar

The Norman radar (KTLX), 130 km from the middle of the area, began a volume at 21:47 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, 9.8 hours before the alert went out and 127 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1050 J/kg
Mixed-layer CIN: -157 J/kg
Mixed-layer LCL: 1417 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Jul 27, 3:58 PM CDT, 47 minutes earlier.

Area forecast discussion, Jul 27, 3:58 PM CDT, 47 minutes before

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Hazardous weather outlook, Jul 27, 11:54 AM CDT, 4 hours 51 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
1154 AM CDT Tue Jul 27 2021

OKZ004>048-050>052-TXZ083>090-281700-
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-
1154 AM CDT Tue Jul 27 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...

.Heat...
Triple digit heat indices will occur across portions of the area
this afternoon. Take steps to prevent heat related illnesses.

.Thunderstorms...
Scattered thunderstorms are possible this afternoon across
portions of central and southern Oklahoma, and western north
Texas. Strong wind gusts over 50 mph could accompany any stronger
storms, along with localized heavy rainfall.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

.Heat...
Hot and humid conditions will likely continue to lead to triple
digit heat index values across much of the region the rest of
this week into the weekend.

.Thunderstorms...
Thunderstorm chances will return to the region late Sunday and
continue into Monday.

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, Jul 27, 4:06 PM CDT, 39 minutes before

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Special weather statement, Jul 27, 4:20 PM CDT, 25 minutes before

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Special weather statement, Jul 27, 4:29 PM CDT, 16 minutes before

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Special weather statement, Jul 27, 4:37 PM CDT, 8 minutes before

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Special weather statement, Jul 27, 4:39 PM CDT, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
439 PM CDT Tue Jul 27 2021

OKZ051-272215-
Marshall OK-
439 PM CDT Tue Jul 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR northwestern Marshall County
Until 515 PM CDT...

AT 437 PM CDT, a strong thunderstorm was located 4 miles west of
Madill, moving southwest at 10 MPH.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 40 to 45 MPH...
Minor flooding in areas of poor drainage...

LAT...LON 3405 9697 3411 9697 3417 9689 3417 9681
      3408 9670 3393 9684
TIME...MOT...LOC 2137Z 29DEG 11KT 3409 9685

SIX

Special weather statement, Jul 27, 4:45 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
445 PM CDT Tue Jul 27 2021

OKZ047-272215-
Johnston OK-
445 PM CDT Tue Jul 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR eastern Johnston County Until 515
PM CDT...

AT 442 PM CDT, a strong thunderstorm was located near Bromide, moving
southwest at 10 MPH. Another strong storm was located 5 miles northeast
of Tishomingo.

HAZARDS INCLUDE...
Hail up to one-half inch diameter...
Wind gusts to 45 MPH...
Minor flooding in areas of poor drainage...

LAT...LON 3414 9651 3427 9679 3447 9658 3444 9651
      3442 9651 3442 9646 3440 9641 3435 9641
TIME...MOT...LOC 2142Z 29DEG 11KT 3437 9654

SIX

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 7:24 PM CDT	Special Weather Statement	OUN	Pontotoc	36 min
Jul 26, 7:53 PM CDT	Special Weather Statement	OUN	Pontotoc	37 min
Jul 27, 7:42 AM CDT	Heat Advisory	OUN	Atoka, Bryan, Coal, Hughes, Johnston, Kay and 7 more	11 hr
Jul 27, 12:33 PM CDT	Heat Advisory	OUN	Atoka, Bryan, Canadian, Carter, Cleveland, Coal and 22 more	30 hr
Jul 27, 3:37 PM CDT	Special Weather Statement	OUN	Bryan	23 min
Jul 27, 3:41 PM CDT	Special Weather Statement	OUN	Pontotoc	19 min
Jul 27, 4:06 PM CDT	Special Weather Statement	OUN	Marshall	24 min
Jul 27, 4:15 PM CDT	Severe Thunderstorm Warning	OUN	Johnston, Marshall	15 min
Jul 27, 4:20 PM CDT	Special Weather Statement	OUN	Bryan	25 min
Jul 27, 4:29 PM CDT	Special Weather Statement	OUN	Pontotoc	31 min
Jul 27, 4:37 PM CDT	Special Weather Statement	OUN	Canadian	23 min
Jul 27, 4:39 PM CDT	Special Weather Statement	OUN	Marshall	36 min
Jul 27, 5:11 PM CDT	Special Weather Statement	OUN	Kiowa	34 min
Jul 27, 6:07 PM CDT	Special Weather Statement	OUN	Coal	23 min
Jul 27, 6:22 PM CDT	Special Weather Statement	OUN	Oklahoma	38 min
Jul 27, 6:49 PM CDT	Special Weather Statement	OUN	Seminole	26 min

Nearby

Special Weather Statements in Oklahoma, 2021 Every 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.