Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 313, NWS Norman, OK

June 13, 2021Greer County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jun 13, 2021, 11:33 AM CDT for Greer County, Oklahoma. It was in force for 42 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 13, 2021, 11:33 AM CDT (16:33 UTC)
Expired: Jun 13, 2021, 12:15 PM CDT
In force: 42 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Greer County, OK

The radar

The Altus AFB radar (KFDR), 79 km from the middle of the area, began a volume at 16:33 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 13, 11:45 AM CDT	TSTM WND DMG	Mangum, OK	LARGE TREES DOWNED. EST. 60 TO 65 MPH.

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

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 4.6 hours before the alert went out and 196 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2078 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -247 m²/s²
0-3 km storm-relative helicity: -150 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

534 
WUUS54 KOUN 131633
SVROUN
OKC055-131715-
/O.NEW.KOUN.SV.W.0313.210613T1633Z-210613T1715Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
1133 AM CDT Sun Jun 13 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southeastern Greer County in southwestern Oklahoma...

* Until 1215 PM CDT.

* At 1133 AM CDT, a severe thunderstorm was located 5 miles southwest
  of Mangum, moving southeast 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...
  Mangum.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3483 9969 3493 9970 3494 9961 3488 9938
      3473 9949
TIME...MOT...LOC 1633Z 298DEG 11KT 3484 9958 

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

JP

2 follow-up statements

000 
WWUS54 KOUN 131647
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1147 AM CDT Sun Jun 13 2021

OKC055-131715-
/O.CON.KOUN.SV.W.0313.000000T0000Z-210613T1715Z/
Greer OK-
1147 AM CDT Sun Jun 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 PM CDT
FOR SOUTHEASTERN GREER COUNTY...

At 1146 AM CDT, a severe thunderstorm was located 4 miles west of
Mangum, moving southeast at 5 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Mangum.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3483 9969 3491 9968 3494 9961 3488 9938
      3473 9949
TIME...MOT...LOC 1646Z 295DEG 6KT 3486 9957 

HAIL...1.50IN
WIND...60MPH
 
$$

JP

782 
WWUS54 KOUN 131707
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1207 PM CDT Sun Jun 13 2021

OKC055-131717-
/O.EXP.KOUN.SV.W.0313.000000T0000Z-210613T1715Z/
Greer OK-
1207 PM CDT Sun Jun 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GREER COUNTY WILL
EXPIRE AT 1215 PM CDT...
                 
The storm which prompted the warning has weakened below severe
limits, therefore the warning will be allowed to expire.

LAT...LON 3483 9969 3491 9968 3494 9961 3488 9938
      3473 9949
TIME...MOT...LOC 1707Z 298DEG 11KT 3483 9951 

$$

JP

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 2:59 AM CDT	Special Weather Statement	OUN	Roger Mills	46 min
Jun 13, 3:42 AM CDT	Special Weather Statement	OUN	Beckham, Custer, Greer, Harmon, Jackson, Roger Mills and 1 more	48 min
Jun 13, 5:33 AM CDT	Special Weather Statement	OUN	Caddo, Comanche	27 min
Jun 13, 7:16 AM CDT	Special Weather Statement	OUN	Cleveland	29 min
Jun 13, 10:33 AM CDT	Special Weather Statement	OUN	Greer	27 min
Jun 13, 10:45 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon	45 min
Jun 13, 12:04 PM CDT	Areal Flood Advisory	OUN	Greer	3 hr
Jun 13, 12:14 PM CDT	Special Weather Statement	OUN	Greer	31 min
Jun 13, 12:21 PM CDT	Special Weather Statement	OUN	Greer	24 min
Jun 13, 12:42 PM CDT	Flash Flood Warning	OUN	Greer	4 hr
Jun 13, 12:45 PM CDT	Special Weather Statement	OUN	Greer	30 min
Jun 13, 1:11 PM CDT	Heat Advisory	OUN	Atoka, Bryan, Carter, Cleveland, Coal, Garvin and 9 more	9 hr
Jun 13, 1:18 PM CDT	Special Weather Statement	OUN	Greer	27 min
Jun 13, 1:21 PM CDT	Severe Thunderstorm Warning	OUN	Greer	39 min
Jun 13, 1:57 PM CDT	Severe Thunderstorm Warning	OUN	Greer	48 min
Jun 13, 2:40 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson	65 min
Jun 13, 3:16 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	59 min
Jun 13, 4:03 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	42 min
Jun 13, 4:07 PM CDT	Special Weather Statement	OUN	McClain	23 min
Jun 13, 4:24 PM CDT	Special Weather Statement	OUN	McClain	36 min
Jun 13, 4:31 PM CDT	Special Weather Statement	OUN	Stephens	29 min
Jun 13, 4:44 PM CDT	Areal Flood Warning	OUN	Greer	2 hr
Jun 13, 4:46 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	44 min
Jun 13, 4:56 PM CDT	Special Weather Statement	OUN	Grady	34 min
Jun 13, 5:06 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	39 min
Jun 13, 5:25 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	50 min
Jun 13, 5:34 PM CDT	River Flood Warning	OUN	Greer, Jackson	2 hr
Jun 13, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	33 min
Jun 13, 5:54 PM CDT	Special Weather Statement	OUN	Garvin	36 min
Jun 13, 6:03 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain, Stephens	42 min
Jun 13, 6:07 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	53 min
Jun 13, 6:11 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian	36 min
Jun 13, 6:19 PM CDT	Special Weather Statement	OUN	Blaine	26 min
Jun 13, 6:25 PM CDT	Special Weather Statement	OUN	Canadian	35 min
Jun 13, 6:38 PM CDT	Areal Flood Advisory	OUN	Garvin, Grady, Stephens	3 hr
Jun 13, 6:39 PM CDT	Severe Thunderstorm Warning	OUN	Grady, Stephens	51 min
Jun 13, 6:43 PM CDT	Special Weather Statement	OUN	Murray	32 min
Jun 13, 6:46 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Major	44 min
Jun 13, 6:50 PM CDT	Special Weather Statement	OUN	Grady	25 min
Jun 13, 6:56 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	49 min

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.