Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 482, NWS Norman, OK

September 7, 20215 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Sep 7, 2021, 7:51 PM CDT for 5 counties in Oklahoma. It was in force for 39 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
Sep 7, 2021, 7:51 PM CDT (00:51 UTC)
Expired
Sep 7, 2021, 8:30 PM CDT
In force
39 min
Issued by
NWS Norman, OK
Area
Storm-based polygon
Damage threat
Considerable
Hail
1.75 in
Wind
70.0 mph

Counties Blaine County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Kingfisher County, OK

The radar

The Vance AFB radar (KVNX), 105 km from the middle of the area, began a volume at 00:52 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

TimeReportWhereRemark
Sep 7, 7:55 PM CDTHAIL 14 Nw Oakwood, OK

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

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.9 hours before the alert went out and 125 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 2021-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2037 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, Norman, OK at 00:00Z on 2021-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.1939Sfc1 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
2037 J/kg
Mixed-layer CIN
-90 J/kg
Mixed-layer LCL
1991 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.0

Open this sounding in Storm Lab

The text

As transmitted.

010 
WUUS54 KOUN 080051
SVROUN
OKC011-017-039-043-073-080130-
/O.NEW.KOUN.SV.W.0482.210908T0051Z-210908T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
751 PM CDT Tue Sep 7 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Kingfisher County in central Oklahoma...
  Northeastern Custer County in western Oklahoma...
  Blaine County in northwestern Oklahoma...
  Southeastern Dewey County in northwestern Oklahoma...
  Northwestern Canadian County in central Oklahoma...

* Until 830 PM CDT.

* At 751 PM CDT, severe thunderstorms were located along a line
  extending from 10 miles west of Hennessey to near Hitchcock to 3
  miles north of Oakwood to 5 miles south of Taloga, moving south at
  20 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...
  Watonga, Kingfisher, Taloga, Okeene, Thomas, Canton, Dover, Custer
  City, Hitchcock, Greenfield, Loyal, Oakwood, Putnam, Eagle City,
  Fay, southeastern Canton Lake, Hucmac, Southard, Omega and Lacey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3605 9907 3617 9795 3582 9778 3566 9821
      3563 9856 3565 9914
TIME...MOT...LOC 0051Z 345DEG 19KT 3612 9808 3600 9839 3598 9869 3596
9894

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

30
1 follow-up statement
180 
WWUS54 KOUN 080115
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
815 PM CDT Tue Sep 7 2021

OKC011-017-039-043-073-080130-
/O.CON.KOUN.SV.W.0482.000000T0000Z-210908T0130Z/
Kingfisher OK-Custer OK-Blaine OK-Dewey OK-Canadian OK-
815 PM CDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM CDT
FOR KINGFISHER...NORTHEASTERN CUSTER...BLAINE...SOUTHEASTERN DEWEY
AND NORTHWESTERN CANADIAN COUNTIES...

At 814 PM CDT, severe thunderstorms were located along a line
extending from 4 miles northeast of Loyal to 4 miles northeast of
Watonga to near Fay to 5 miles northwest of Thomas, moving south at
25 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...
Watonga, Kingfisher, Taloga, Okeene, Thomas, Canton, Dover, Custer
City, Hitchcock, Greenfield, Loyal, Oakwood, Putnam, Eagle City, Fay,
southeastern Canton Lake, Hucmac, Southard, Omega and Lacey.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3605 9907 3617 9795 3582 9778 3566 9821
      3563 9856 3565 9914
TIME...MOT...LOC 0114Z 343DEG 21KT 3600 9804 3588 9835 3583 9863 3581
9881

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

30

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 7, 7:15 PM CDTSpecial Weather StatementOUNRoger Mills30 min
Sep 7, 7:21 PM CDTSevere Thunderstorm Warning Considerable damage threatOUNBlaine, Dewey, Kingfisher, Major39 min
Sep 7, 7:43 PM CDTSpecial Weather StatementOUNNoble32 min
Sep 7, 8:02 PM CDTSevere Thunderstorm WarningOUNLogan, Noble, Payne25 min
Sep 7, 8:21 PM CDTSpecial Weather StatementOUNCuster24 min
Sep 7, 8:27 PM CDTSevere Thunderstorm WarningOUNBlaine, Custer, Dewey33 min
Sep 7, 8:46 PM CDTSpecial Weather StatementOUNCuster29 min
Sep 7, 9:11 PM CDTSpecial Weather StatementOUNBeckham34 min
Sep 7, 9:19 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer41 min
Sep 7, 9:23 PM CDTSpecial Weather StatementOUNWashita37 min
Sep 7, 9:40 PM CDTSpecial Weather StatementOUNKay35 min
Sep 8, 12:40 AM CDTSpecial Weather StatementOUNCotton35 min
Sep 8, 4:55 AM CDTSpecial Weather StatementOUNBryan35 min
Sep 8, 5:31 AM CDTSpecial Weather StatementOUNBryan29 min
Sep 8, 6:10 AM CDTSpecial Weather StatementOUNBryan35 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.