Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Norman, OK

March 16, 2021Greer County, Kiowa County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 16, 2021, 9:29 PM CDT for Greer County, Kiowa County, Oklahoma. It was in force for 46 min. 4 reports 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: Mar 16, 2021, 9:29 PM CDT (02:29 UTC)
Expired: Mar 16, 2021, 10:15 PM CDT
In force: 46 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Greer County, OK, Kiowa County, OK

The radar

The Altus AFB radar (KFDR), 89 km from the middle of the area, began a volume at 02:31 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
Mar 16, 9:30 PM CDT	HAIL 1	3 Wnw Mangum, OK
Mar 16, 9:58 PM CDT	HAIL 1	4 Sse Brinkman, OK
Mar 16, 10:00 PM CDT	HAIL 1	4 N Mangum, OK
Mar 16, 10:05 PM CDT	HAIL 1.75	1 E Brinkman, OK

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Mar 16, 7:49 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.5 hours before the alert went out and 192 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: 626 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1825 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

031 
WUUS54 KOUN 170229
SVROUN
OKC055-075-170315-
/O.NEW.KOUN.SV.W.0021.210317T0229Z-210317T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
929 PM CDT Tue Mar 16 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northwestern Kiowa County in southwestern Oklahoma...
  Central Greer County in southwestern Oklahoma...

* Until 1015 PM CDT.

* At 929 PM CDT, a severe thunderstorm was located 7 miles west of
  Mangum, moving northeast at 25 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Trained weather spotters. 

  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...
  Granite, Willow and Brinkman. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3512 9953 3512 9944 3511 9944 3512 9941
      3512 9919 3486 9955 3482 9972 3493 9973
TIME...MOT...LOC 0229Z 230DEG 21KT 3491 9964 

HAIL...1.75IN
WIND...60MPH
 
$$

Mahale

3 follow-up statements

900 
WWUS54 KOUN 170242
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
942 PM CDT Tue Mar 16 2021

OKC055-075-170315-
/O.CON.KOUN.SV.W.0021.000000T0000Z-210317T0315Z/
Kiowa OK-Greer OK-
942 PM CDT Tue Mar 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR NORTHWESTERN KIOWA AND NORTHEASTERN GREER COUNTIES...

At 942 PM CDT, a severe thunderstorm was located 7 miles southwest of
Willow, moving northeast at 25 mph.

HAZARD...Golf 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...
Granite, Willow and Brinkman. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3512 9944 3511 9943 3512 9940 3512 9919
      3489 9951 3490 9962 3493 9973 3512 9953
TIME...MOT...LOC 0242Z 212DEG 22KT 3497 9961 

HAIL...1.75IN
WIND...60MPH
 
$$

Mahale

470 
WWUS54 KOUN 170253
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
953 PM CDT Tue Mar 16 2021

OKC055-075-170315-
/O.CON.KOUN.SV.W.0021.000000T0000Z-210317T0315Z/
Kiowa OK-Greer OK-
953 PM CDT Tue Mar 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR NORTHWESTERN KIOWA AND NORTHEASTERN GREER COUNTIES...

At 953 PM CDT, a severe thunderstorm was located 4 miles south of
Willow, moving northeast at 25 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...
Granite, Willow and Brinkman. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3512 9944 3511 9943 3512 9940 3512 9919
      3489 9951 3490 9961 3497 9969 3512 9953
TIME...MOT...LOC 0253Z 232DEG 21KT 3499 9953 

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

Mahale

813 
WWUS54 KOUN 170300
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1000 PM CDT Tue Mar 16 2021

OKC055-075-170315-
/O.CON.KOUN.SV.W.0021.000000T0000Z-210317T0315Z/
Kiowa OK-Greer OK-
1000 PM CDT Tue Mar 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR NORTHWESTERN KIOWA AND NORTHEASTERN GREER COUNTIES...

At 1000 PM CDT, a severe thunderstorm was located 4 miles southeast
of Willow, moving northeast at 25 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...
Granite, Willow and Brinkman. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3512 9944 3511 9943 3512 9940 3512 9919
      3489 9951 3490 9958 3507 9958 3512 9953
TIME...MOT...LOC 0300Z 232DEG 21KT 3499 9948 

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

Mahale

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 16, 8:19 PM CDT	Severe Thunderstorm Warning	OUN	Beckham	26 min
Mar 16, 8:22 PM CDT	Special Weather Statement	OUN	Harmon	23 min
Mar 16, 8:42 PM CDT	Special Weather Statement	OUN	Harmon	33 min
Mar 16, 8:45 PM CDT	Special Weather Statement	OUN	Beckham	30 min
Mar 16, 8:47 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	43 min
Mar 16, 9:33 PM CDT	Severe Thunderstorm Warning	OUN	Ellis	42 min
Mar 16, 9:44 PM CDT	Special Weather Statement	OUN	Harper	31 min
Mar 16, 9:55 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Roger Mills	35 min
Mar 16, 10:06 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	39 min
Mar 16, 10:11 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Woodward	64 min
Mar 16, 10:12 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	48 min
Mar 16, 10:43 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Washita	47 min
Mar 16, 10:45 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Major, Woodward	60 min
Mar 16, 10:56 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	49 min
Mar 16, 11:17 PM CDT	Tornado Warning	OUN	Caddo, Kiowa, Washita	43 min
Mar 16, 11:32 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods, Woodward	58 min
Mar 16, 11:40 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Washita	50 min
Mar 16, 11:47 PM CDT	Severe Thunderstorm Warning	OUN	Ellis, Harper, Roger Mills, Woodward	58 min
Mar 16, 11:50 PM CDT	Special Weather Statement	OUN	Harmon	25 min
Mar 16, 11:53 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	52 min
Mar 16, 11:56 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Washita	49 min
Mar 17, 12:04 AM CDT	Special Weather Statement	OUN	Dewey	26 min
Mar 17, 12:09 AM CDT	Special Weather Statement	OUN	Blaine, Kingfisher	36 min
Mar 17, 12:09 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Ellis, Roger Mills, Woodward	51 min
Mar 17, 12:18 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	42 min
Mar 17, 12:20 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Washita	40 min
Mar 17, 12:32 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Kiowa, Washita	43 min
Mar 17, 12:34 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Major, Woodward	56 min
Mar 17, 12:42 AM CDT	Special Weather Statement	OUN	Ellis	33 min
Mar 17, 12:42 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian	31 min
Mar 17, 12:44 AM CDT	Tornado Warning	OUN	Dewey	21 min
Mar 17, 12:54 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian	51 min
Mar 17, 12:59 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Garfield, Kingfisher, Major	46 min
Mar 17, 1:14 AM CDT	Severe Thunderstorm Warning	OUN	Greer, Kiowa, Washita	33 min
Mar 17, 1:26 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Dewey, Kingfisher, Major	49 min
Mar 17, 1:27 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	48 min
Mar 17, 1:30 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher	45 min
Mar 17, 1:39 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Kingfisher, Major	37 min
Mar 17, 1:42 AM CDT	Severe Thunderstorm Warning	OUN	Garfield	16 min
Mar 17, 1:54 AM CDT	Areal Flood Advisory	OUN	Blaine, Canadian, Custer, Kingfisher	111 min
Mar 17, 1:57 AM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey	33 min
Mar 17, 2:11 AM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	49 min
Mar 17, 2:13 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan	47 min
Mar 17, 2:42 AM CDT	Flash Flood Warning	OUN	Blaine, Kingfisher	3 hr
Mar 17, 2:55 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	65 min
Mar 17, 2:57 AM CDT	Special Weather Statement	OUN	Kingfisher, Logan	33 min
Mar 17, 3:19 AM CDT	Winter Weather Advisory	OUN	Dewey, Ellis, Harper, Major, Roger Mills, Woodward	16 hr
Mar 17, 3:29 AM CDT	Special Weather Statement	OUN	Logan, Payne	46 min
Mar 17, 3:32 AM CDT	Areal Flood Advisory	OUN	Garfield, Kingfisher	3 hr
Mar 17, 3:46 AM CDT	Areal Flood Advisory	OUN	Garfield, Kay, Logan, Noble	3 hr
Mar 17, 4:01 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	27 min
Mar 17, 5:40 AM CDT	Severe Thunderstorm Warning	OUN	Bryan	35 min
Mar 17, 6:11 AM CDT	Severe Thunderstorm Warning	OUN	Bryan	34 min
Mar 17, 8:45 AM CDT	River Flood Advisory	OUN	Major, Woods, Woodward	11 hr
Mar 17, 8:55 AM CDT	River Flood Advisory	OUN	Blaine, Canadian	28 hr
Mar 17, 8:58 AM CDT	River Flood Advisory	OUN	Kingfisher, Logan	64 hr
Mar 17, 9:01 AM CDT	River Flood Advisory	OUN	Blaine, Caddo, Canadian, Custer	11 hr
Mar 17, 12:57 PM CDT	River Flood Advisory	OUN	Kingfisher	18 hr
Mar 17, 3:21 PM CDT	Special Weather Statement	OUN	Pottawatomie	24 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.