Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 20, NWS Norman, OK

March 16, 2021Greer County, Harmon County, Jackson County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 16, 2021, 8:47 PM CDT for Greer County, Harmon County, Jackson County, Oklahoma. It was in force for 43 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, 8:47 PM CDT (01:47 UTC)
Expired: Mar 16, 2021, 9:30 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Greer County, OK, Harmon County, OK, Jackson County, OK

The radar

The Altus AFB radar (KFDR), 79 km from the middle of the area, began a volume at 01:50 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, 8:47 PM CDT	HAIL 0.7	4 Wnw Gould, OK
Mar 16, 9:25 PM CDT	HAIL 1	10 E Vinson, OK
Mar 16, 9:25 PM CDT	HAIL 1.75	1 W Mangum, OK
Mar 16, 9:30 PM CDT	HAIL 1	3 Wnw Mangum, 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 1.8 hours before the alert went out and 197 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: 127 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 3287 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

060 
WUUS54 KOUN 170147
SVROUN
OKC055-057-065-170230-
/O.NEW.KOUN.SV.W.0020.210317T0147Z-210317T0230Z/

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

The National Weather Service in Norman has issued a

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

* Until 930 PM CDT.

* At 847 PM CDT, a severe thunderstorm was located near Gould, moving
  northeast at 40 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, Hollis, Granite, Martha, Willow, Gould, Duke, Brinkman,
  Hester, McKnight, McQueen and northwestern Altus-Lugert Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3483 9992 3507 9949 3498 9935 3497 9934
      3497 9933 3494 9933 3494 9932 3468 9940
      3461 9998 3470 9999
TIME...MOT...LOC 0147Z 233DEG 35KT 3470 9981 

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

Mahale

3 follow-up statements

908 
WWUS54 KOUN 170157
SVSOUN

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

OKC055-057-065-170230-
/O.CON.KOUN.SV.W.0020.000000T0000Z-210317T0230Z/
Jackson OK-Harmon OK-Greer OK-
857 PM CDT Tue Mar 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR NORTHWESTERN JACKSON...CENTRAL HARMON AND GREER COUNTIES...

At 857 PM CDT, a severe thunderstorm was located 7 miles north of
Gould, moving northeast 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...
Mangum, Hollis, Granite, Willow, Brinkman, Hester, McKnight and
northwestern Altus-Lugert Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3483 9992 3507 9949 3498 9935 3497 9934
      3497 9933 3494 9933 3494 9932 3474 9938
      3466 9986 3472 9993
TIME...MOT...LOC 0157Z 226DEG 32KT 3478 9981 

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

Mahale

650 
WWUS54 KOUN 170208
SVSOUN

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

OKC055-057-065-170230-
/O.CON.KOUN.SV.W.0020.000000T0000Z-210317T0230Z/
Jackson OK-Harmon OK-Greer OK-
908 PM CDT Tue Mar 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR NORTHERN JACKSON...NORTHEASTERN HARMON AND CENTRAL GREER
COUNTIES...

At 908 PM CDT, a severe thunderstorm was located 8 miles southeast of
Vinson, moving northeast at 40 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, Granite, Willow, Hester, Brinkman and northwestern
Altus-Lugert Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3507 9949 3498 9935 3497 9934 3497 9933
      3494 9933 3494 9932 3477 9937 3472 9979
      3477 9985 3487 9985
TIME...MOT...LOC 0208Z 232DEG 34KT 3482 9973 

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

Mahale

408 
WWUS54 KOUN 170219
SVSOUN

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

OKC065-170229-
/O.CAN.KOUN.SV.W.0020.000000T0000Z-210317T0230Z/
Jackson OK-
919 PM CDT Tue Mar 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN JACKSON COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3507 9949 3498 9935 3497 9934 3497 9933
      3494 9933 3494 9932 3486 9935 3478 9971
      3482 9977 3490 9979
TIME...MOT...LOC 0219Z 228DEG 25KT 3486 9968 

$$

OKC055-057-170230-
/O.CON.KOUN.SV.W.0020.000000T0000Z-210317T0230Z/
Harmon OK-Greer OK-
919 PM CDT Tue Mar 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR NORTHEASTERN HARMON AND CENTRAL GREER COUNTIES...

At 919 PM CDT, a severe thunderstorm was located 10 miles east of
Vinson, moving northeast at 30 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, Granite, Willow, Brinkman and northwestern Altus-Lugert Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3507 9949 3498 9935 3497 9934 3497 9933
      3494 9933 3494 9932 3486 9935 3478 9971
      3482 9977 3490 9979
TIME...MOT...LOC 0219Z 228DEG 25KT 3486 9968 

HAIL...1.00IN
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, 9:29 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Kiowa	46 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.