Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 37, NWS Norman, OK

March 17, 20214 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 17, 2021, 12:20 AM CDT for 4 counties in Oklahoma. It was in force for 40 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: Mar 17, 2021, 12:20 AM CDT (05:20 UTC)
Expired: Mar 17, 2021, 1:00 AM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Blaine County, OK, Caddo County, OK, Custer County, OK, Washita County, OK

The radar

The Norman radar (KTLX), 118 km from the middle of the area, began a volume at 05:23 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 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, 5.3 hours before the alert went out and 110 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.

138 
WUUS54 KOUN 170520
SVROUN
OKC011-015-039-149-170600-
/O.NEW.KOUN.SV.W.0037.210317T0520Z-210317T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
1220 AM CDT Wed Mar 17 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northeastern Washita County in western Oklahoma...
  Northwestern Caddo County in southwestern Oklahoma...
  Southeastern Custer County in western Oklahoma...
  Southwestern Blaine County in northwestern Oklahoma...

* Until 100 AM CDT.

* At 1220 AM CDT, a severe thunderstorm was located 4 miles north of
  Colony, moving northeast at 20 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...
  Hydro, Colony and Bridgeport. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3532 9870 3542 9879 3567 9850 3560 9841
      3551 9831
TIME...MOT...LOC 0520Z 225DEG 19KT 3541 9868 

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

Mahale

1 follow-up statement

425 
WWUS54 KOUN 170536
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1236 AM CDT Wed Mar 17 2021

OKC011-015-039-149-170600-
/O.CON.KOUN.SV.W.0037.000000T0000Z-210317T0600Z/
Washita OK-Caddo OK-Custer OK-Blaine OK-
1236 AM CDT Wed Mar 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR NORTHEASTERN WASHITA...NORTHWESTERN CADDO...SOUTHEASTERN CUSTER
AND SOUTHWESTERN BLAINE COUNTIES...

At 1236 AM CDT, a severe thunderstorm was located 6 miles south of
Hydro, moving northeast at 20 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Hydro and Bridgeport. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms.

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

&&

LAT...LON 3547 9873 3567 9850 3560 9841 3551 9831
      3536 9864
TIME...MOT...LOC 0536Z 225DEG 19KT 3546 9860 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

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, 9:29 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, 12:32 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.