Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 366, NWS Norman, OK

July 7, 2021Garfield County, Grant County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 7, 2021, 4:16 PM CDT for Garfield County, Grant County, Oklahoma. It was in force for 59 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 7, 2021, 4:16 PM CDT (21:16 UTC)
Expired
Jul 7, 2021, 5:15 PM CDT
In force
59 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Garfield County, OK, Grant County, OK

The radar

The Vance AFB radar (KVNX), 34 km from the middle of the area, began a volume at 21:18 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

Dodge City, (KDDC), launched 12:00Z, 9.3 hours before the alert went out and 228 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, Dodge City, at 12:00Z on 2021-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 58 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Dodge City, at 12:00Z on 2021-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -35 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
58 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
975 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-35 m²/s²
0-3 km storm-relative helicity
-42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

849 
WUUS54 KOUN 072116
SVROUN
OKC047-053-072215-
/O.NEW.KOUN.SV.W.0366.210707T2116Z-210707T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
416 PM CDT Wed Jul 7 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southwestern Grant County in northern Oklahoma...
  Northwestern Garfield County in northern Oklahoma...

* Until 515 PM CDT.

* At 416 PM CDT, severe thunderstorms were located along a line
  extending from 6 miles east of Pond Creek to 6 miles east of Nash,
  moving south at 10 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...
  Pond Creek, Kremlin, Hunter, Hillsdale and Jefferson. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with these storms. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 3652 9757 3652 9807 3673 9803 3674 9766
TIME...MOT...LOC 2116Z 356DEG 7KT 3667 9768 3667 9794 

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

03
2 follow-up statements
206 
WWUS54 KOUN 072139
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
439 PM CDT Wed Jul 7 2021

OKC047-053-072215-
/O.CON.KOUN.SV.W.0366.000000T0000Z-210707T2215Z/
Grant OK-Garfield OK-
439 PM CDT Wed Jul 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR SOUTHWESTERN GRANT AND NORTHWESTERN GARFIELD COUNTIES...

At 438 PM CDT, a severe thunderstorm was located near Kremlin, moving
south at 15 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...
Pond Creek, Kremlin, Hunter and Hillsdale. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Torrential rainfall is occurring with this storm, and may lead to 
localized flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 3652 9757 3652 9807 3673 9803 3669 9770
TIME...MOT...LOC 2138Z 346DEG 12KT 3659 9786 

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

03
319 
WWUS54 KOUN 072209
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
509 PM CDT Wed Jul 7 2021

OKC047-053-072219-
/O.EXP.KOUN.SV.W.0366.000000T0000Z-210707T2215Z/
Grant OK-Garfield OK-
509 PM CDT Wed Jul 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GRANT AND
NORTHWESTERN GARFIELD COUNTIES WILL EXPIRE AT 515 PM CDT...
                 
The storm which prompted the warning has weakened below severe
limits, therefore the warning will be allowed to expire.  However
gusty winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3652 9757 3652 9807 3673 9803 3669 9770
TIME...MOT...LOC 2209Z 356DEG 7KT 3653 9786 

$$

Bunker

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 7, 1:10 PM CDTSpecial Weather StatementOUNKay35 min
Jul 7, 1:30 PM CDTSpecial Weather StatementOUNNoble15 min
Jul 7, 1:47 PM CDTSpecial Weather StatementOUNNoble28 min
Jul 7, 2:16 PM CDTSpecial Weather StatementOUNGarfield29 min
Jul 7, 3:26 PM CDTSpecial Weather StatementOUNAlfalfa34 min
Jul 7, 3:38 PM CDTSpecial Weather StatementOUNCanadian37 min
Jul 7, 3:43 PM CDTSpecial Weather StatementOUNKay47 min
Jul 7, 3:49 PM CDTSpecial Weather StatementOUNAlfalfa41 min
Jul 7, 3:55 PM CDTSpecial Weather StatementOUNGrant50 min
Jul 7, 3:58 PM CDTSpecial Weather StatementOUNOklahoma47 min
Jul 7, 4:43 PM CDTSpecial Weather StatementOUNMajor47 min
Jul 7, 4:48 PM CDTSpecial Weather StatementOUNGarfield42 min
Jul 7, 5:02 PM CDTSpecial Weather StatementOUNMajor43 min
Jul 7, 5:07 PM CDTAreal Flood AdvisoryOUNGarfield, Grant3 hr
Jul 7, 5:22 PM CDTSpecial Weather StatementOUNGarfield23 min
Jul 7, 5:29 PM CDTSpecial Weather StatementOUNCleveland31 min
Jul 7, 5:39 PM CDTAreal Flood AdvisoryOUNGarfield3 hr
Jul 7, 5:40 PM CDTSpecial Weather StatementOUNBlaine50 min
Jul 7, 5:51 PM CDTFlash Flood WarningOUNGarfield3 hr
Jul 7, 5:54 PM CDTSpecial Weather StatementOUNBlaine, Custer, Dewey36 min
Jul 7, 6:00 PM CDTSpecial Weather StatementOUNMurray30 min
Jul 7, 6:16 PM CDTSpecial Weather StatementOUNComanche44 min
Jul 7, 6:27 PM CDTSpecial Weather StatementOUNRoger Mills33 min
Jul 7, 6:47 PM CDTSpecial Weather StatementOUNCuster43 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.