Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 292, NWS Norman, OK

June 7, 2021Comanche County, Cotton County, Tillman County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 7, 2021, 4:10 AM CDT for Comanche County, Cotton County, Tillman County, Oklahoma. It was in force for 50 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jun 7, 2021, 4:10 AM CDT (09:10 UTC)
Expired: Jun 7, 2021, 5:00 AM CDT
In force: 50 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.75 in
Wind: 70.0 mph

Counties Comanche County, OK, Cotton County, OK, Tillman County, OK

The radar

The Altus AFB radar (KFDR), 29 km from the middle of the area, began a volume at 09:14 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.

What was reported inside it

Time	Report	Where	Remark
Jun 7, 4:50 AM CDT	TSTM WND DMG	2 N Grandfield, OK	BROKEN TREE LIMBS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 40 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 7, 2:48 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 9.2 hours before the alert went out and 203 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: 1357 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1516 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted.

031 
WUUS54 KOUN 070910
SVROUN
OKC031-033-141-071000-
/O.NEW.KOUN.SV.W.0292.210607T0910Z-210607T1000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
410 AM CDT Mon Jun 7 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southwestern Comanche County in southwestern Oklahoma...
  Southwestern Cotton County in southwestern Oklahoma...
  Tillman County in southwestern Oklahoma...

* Until 500 AM CDT.

* At 410 AM CDT, severe thunderstorms were located along a line
  extending from 4 miles west of Chattanooga to near Loveland to 4
  miles east of Davidson, moving southeast at 35 mph.

  HAZARD...Golf ball size hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Frederick, Grandfield, Chattanooga, Randlett, Davidson, Devol,
  Hollister, Loveland, Cookietown and Taylor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3416 9860 3417 9865 3413 9869 3413 9874
      3416 9883 3415 9887 3417 9887 3421 9895
      3420 9897 3422 9899 3420 9901 3421 9910
      3434 9915 3456 9887 3451 9866 3418 9824
      3413 9827 3416 9837 3408 9842 3406 9849
TIME...MOT...LOC 0910Z 316DEG 30KT 3441 9873 3429 9880 3425 9900 

HAIL...1.75IN
WIND...70MPH
 
$$

JT

1 follow-up statement

900 
WWUS54 KOUN 070949
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
449 AM CDT Mon Jun 7 2021

OKC031-033-141-071000-
/O.CON.KOUN.SV.W.0292.000000T0000Z-210607T1000Z/
Comanche OK-Cotton OK-Tillman OK-
449 AM CDT Mon Jun 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 AM CDT
FOR SOUTHWESTERN COMANCHE...SOUTHWESTERN COTTON AND SOUTHEASTERN
TILLMAN COUNTIES...

At 449 AM CDT, severe thunderstorms were located along a line
extending from near Randlett to near Burkburnett to 6 miles northwest
of Iowa Park, moving southeast at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Grandfield, Chattanooga, Randlett, Devol, Hollister, Loveland,
Cookietown and Taylor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3416 9860 3417 9865 3413 9869 3413 9874
      3416 9883 3415 9887 3417 9887 3421 9895
      3420 9897 3422 9899 3420 9901 3421 9910
      3451 9866 3418 9824 3413 9827 3416 9837
      3408 9842 3406 9849
TIME...MOT...LOC 0949Z 316DEG 30KT 3419 9848 3407 9855 3403 9875 

HAIL...1.00IN
WIND...60MPH
 
$$

JT

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 Jun 7, 3:14 AM CDT, 56 minutes earlier.

Area forecast discussion, Jun 7, 3:14 AM CDT, 56 minutes before

Area Forecast Discussion
National Weather Service Norman OK
314 AM CDT Mon Jun 7 2021

...New LONG TERM...

.SHORT TERM...
(Today and tonight)
Issued at 126 AM CDT Mon Jun 7 2021

Challenging forecast in the short term for precipitation chances
given the disagreement among CAMS and synoptic models. The
midlevel low currently centered near KS/MO/OK/AR border slowly
lifts northeastward as a few shortwaves rotate around the center
of the upper low. Periods of showers/thunderstorms are expected
through tonight, though there is quite a bit of uncertainty as to
timing and location as models struggle with precip development.
Regardless, scattered storms are likely this morning, generally
south of I-40. Locally heavy rainfall is a concern with a slight
risk of flooding for southern Oklahoma and western north Texas.

Thompson

&&

.LONG TERM...
(Tuesday through Sunday)
Issued at 314 AM CDT Mon Jun 7 2021

Will have some lingering POPs east on Tuesday, then the upper
trough will move east and the upper ridge will begin to build into
the area. NAM and GFS both start pushing some very warm low-level
air into the western and southern part of the area mid week as
seen by the warm progged 850 mb temperatures, but it may be
difficult to get surface temperatures quite as warm as these 850
mb temperatures would support given recent rainfall and high
high dewpoints expected to remain over the area.

A northern stream wave moves toward the northern Plains which will
both act to flatten the upper ridge somewhat, but also nudge a
front down the Plains into the area Thursday night or Friday.
Beyond that, there are hints of a weakness around the east side of
the ridge that could bring some precipitation to eastern sections
of the area this weekend, but confidence is not high trying to
key in on such a relatively subtle feature that far into the
future.

&&

.AVIATION...
(06Z TAFS)
Issued at 1056 PM CDT Sun Jun 6 2021

Still expecting showers and thunderstorms to develop over central
OK, and move into southwestern OK and north TX overnight. However,
coverage still appears questionable so have adjusted a few of the
TAFs to exclude any mention of CB/TS. MVFR to IFR cigs, and
perhaps some BR, will also remain in the forecast for early Monday
morning. Flight conditions should improve rather quickly after
14-15Z. Additional shower and thunderstorm chances may continue
after 15Z near PNC and SWO.

&&

.UPPER AIR...
Issued at 241 AM CDT Thu Jun 3 2021

No Upper Air flights are currently planned.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  82  68  84  72 /  60  20  10   0
Hobart OK         88  69  92  72 /  30  20   0   0
Wichita Falls TX  86  70  92  74 /  80  20  10   0
Gage OK           89  67  91  69 /  30  20   0   0
Ponca City OK     84  67  86  72 /  60  30  10  10
Durant OK         82  69  87  72 /  80  60  30  10

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...None.
TX...None.
&&

SHORT TERM...01
LONG TERM....26
AVIATION...03

Hazardous weather outlook, Jun 7, 12:21 AM CDT, 3 hours 49 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Norman OK
1221 AM CDT Mon Jun 7 2021

OKZ004>048-050>052-TXZ083>090-080530-
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-
1221 AM CDT Mon Jun 7 2021

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

.DAY ONE...Overnight...

.Thunderstorms...
There is a Marginal Risk of severe thunderstorms early this
morning across the western part of north Texas, and that part of
southwestern Oklahoma southwest of a line from Cheyenne to Ardmore.
The primary severe weather hazards will be hail up to the size of
quarters and wind gusts up to 60 mph. In addition, locally heavy
rainfall could result in flash flooding.

.DAYS TWO THROUGH SEVEN...Monday through Saturday...

.Thunderstorms...
Scattered thunderstorms will continue and redevelop on Monday with
thunderstorm chances continuing through Tuesday. The potential for
severe weather will be low on Monday and Tuesday.

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, Jun 7, 1:46 AM CDT, 2 hours 24 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
146 AM CDT Mon Jun 7 2021

OKZ038-070715-
Comanche OK-
146 AM CDT Mon Jun 7 2021

...SIGNIFICANT WEATHER ADVISORY FOR central Comanche County Until 215
AM CDT...

AT 144 AM CDT, a strong thunderstorm was located over western Fort
Sill, moving southeast at 10 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...
Minor flooding in areas of poor drainage...

LAT...LON 3467 9871 3485 9861 3469 9824 3445 9848
      3445 9850 3443 9850 3442 9851 3442 9854
TIME...MOT...LOC 0644Z 311DEG 9KT 3469 9857

JT

Special weather statement, Jun 7, 1:48 AM CDT, 2 hours 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
148 AM CDT Mon Jun 7 2021

OKZ022-023-035-038-070715-
Kiowa OK-Washita OK-Caddo OK-Comanche OK-
148 AM CDT Mon Jun 7 2021

...SIGNIFICANT WEATHER ADVISORY FOR Kiowa...southeastern Washita...
southwestern Caddo and northwestern Comanche Counties Until 215 AM
CDT...

AT 144 AM CDT, strong thunderstorms were along a line extending from
4 miles south of Mountain View to near Cooperton, moving southeast at
15 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3525 9892 3507 9846 3454 9881 3456 9883
      3459 9883 3459 9887 3490 9920
TIME...MOT...LOC 0644Z 305DEG 11KT 3504 9877 3485 9892

JT

Special weather statement, Jun 7, 3:05 AM CDT, 1 hour 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE Norman OK
305 AM CDT Mon Jun 7 2021

OKZ036-TXZ083-085-070830-
Jackson OK-Wilbarger TX-Hardeman TX-
305 AM CDT Mon Jun 7 2021

...SIGNIFICANT WEATHER ADVISORY FOR southwestern Jackson...
northwestern Wilbarger and eastern Hardeman Counties Until 330 AM
CDT...

AT 301 AM CDT, strong thunderstorms were along a line extending from
6 miles northwest of Odell to 6 miles south of Eldorado, moving
southeast at 20 MPH.

HAZARDS INCLUDE...
Hail up to the size of nickels...
Wind gusts to 50 MPH...

LAT...LON 3451 9967 3452 9955 3452 9943 3426 9920
      3416 9970 3451 9983
TIME...MOT...LOC 0801Z 333DEG 15KT 3442 9948 3438 9965

JT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 1:46 AM CDT	Special Weather Statement	OUN	Comanche	29 min
Jun 7, 1:48 AM CDT	Special Weather Statement	OUN	Kiowa	27 min
Jun 7, 1:51 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa, Washita	39 min
Jun 7, 2:02 AM CDT	Severe Thunderstorm Warning	OUN	Comanche	43 min
Jun 7, 2:27 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa	48 min
Jun 7, 2:41 AM CDT	Severe Thunderstorm Warning	OUN	Comanche	49 min
Jun 7, 3:04 AM CDT	Areal Flood Advisory	OUN	Comanche, Kiowa	3 hr
Jun 7, 3:11 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	49 min
Jun 7, 3:15 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche	45 min
Jun 7, 3:19 AM CDT	Severe Thunderstorm Warning	OUN	Jackson	41 min
Jun 7, 3:30 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa, Tillman	45 min
Jun 7, 3:53 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Jackson, Kiowa, Washita	52 min
Jun 7, 4:21 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Garvin, Grady	39 min
Jun 7, 4:39 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	24 min
Jun 7, 4:52 AM CDT	Areal Flood Advisory	OUN	Jackson, Kiowa, Tillman	5 hr
Jun 7, 4:58 AM CDT	Areal Flood Advisory	OUN	Comanche	3 hr
Jun 7, 5:00 AM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	29 min
Jun 7, 5:01 AM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	27 min
Jun 7, 6:47 AM CDT	River Flood Advisory	OUN	Atoka	7 hr
Jun 7, 9:14 AM CDT	Areal Flood Advisory	OUN	Hughes	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.