Alert archive / Texas / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 207, NWS Norman, OK

May 17, 20215 counties in Texas; Tillman County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 17, 2021, 12:14 AM CDT for 5 counties in Texas; Tillman County, Oklahoma. It was in force for 38 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: May 17, 2021, 12:14 AM CDT (05:14 UTC)
Expired: May 17, 2021, 12:52 AM CDT
In force: 38 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Tillman County, OK, Archer County, TX, Baylor County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Altus AFB radar (KFDR), 49 km from the middle of the area, began a volume at 05:16 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
May 16, 9:38 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 5.2 hours before the alert went out and 199 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: 496 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 815 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

533 
WUUS54 KOUN 170514
SVROUN
OKC141-TXC009-023-275-485-487-170615-
/O.NEW.KOUN.SV.W.0207.210517T0514Z-210517T0615Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
1214 AM CDT Mon May 17 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southern Tillman County in southwestern Oklahoma...
  Northwestern Archer County in northern Texas...
  Wichita County in northern Texas...
  East central Knox County in northern Texas...
  Southeastern Wilbarger County in northern Texas...
  Baylor County in northern Texas...

* Until 115 AM CDT.

* At 1213 AM CDT, severe thunderstorms were located along a line
  extending from 3 miles southwest of Oklaunion to 4 miles northwest
  of Lake Kemp to 4 miles south of Vera, moving east 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...
  Seymour, Iowa Park, Electra, Holliday, Grandfield, Davidson,
  Megargel, Loveland, Red Springs, Lake Diversion, Dundee, Westover,
  Harrold, Bomarton, Lake Kemp, Mabelle, Oklaunion, Mankins, Grayback
  and Lake Kickapoo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3433 9861 3382 9862 3340 9897 3353 9961
      3380 9933 3424 9921
TIME...MOT...LOC 0513Z 270DEG 33KT 3409 9919 3380 9926 3357 9954 

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

11

2 follow-up statements

432 
WWUS54 KOUN 170532
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1232 AM CDT Mon May 17 2021

TXC275-170542-
/O.CAN.KOUN.SV.W.0207.000000T0000Z-210517T0615Z/
Knox TX-
1232 AM CDT Mon May 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL KNOX COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3433 9861 3382 9862 3352 9887 3363 9932
      3382 9921 3424 9918
TIME...MOT...LOC 0532Z 268DEG 40KT 3409 9899 3381 9898 3359 9912 

$$

OKC141-TXC009-023-485-487-170615-
/O.CON.KOUN.SV.W.0207.000000T0000Z-210517T0615Z/
Tillman OK-Archer TX-Wichita TX-Wilbarger TX-Baylor TX-
1232 AM CDT Mon May 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 AM CDT
FOR SOUTHERN TILLMAN...NORTHWESTERN ARCHER...WICHITA...SOUTHEASTERN
WILBARGER AND NORTHEASTERN BAYLOR COUNTIES...

At 1232 AM CDT, severe thunderstorms were located along a line
extending from near Harrold to near Lake Diversion to 5 miles south
of Mabelle, moving east at 45 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...
Iowa Park, Electra, Holliday, Grandfield, Davidson, Loveland, Lake
Diversion, Dundee, Harrold, Lake Kemp, Mabelle, Oklaunion, Mankins,
Grayback, Lake Kickapoo, Pleasant Valley and Haynesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3433 9861 3382 9862 3352 9887 3363 9932
      3382 9921 3424 9918
TIME...MOT...LOC 0532Z 268DEG 40KT 3409 9899 3381 9898 3359 9912 

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

11

008 
WWUS54 KOUN 170552
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1252 AM CDT Mon May 17 2021

OKC141-TXC009-023-485-487-170602-
/O.CAN.KOUN.SV.W.0207.000000T0000Z-210517T0615Z/
Tillman OK-Archer TX-Wichita TX-Wilbarger TX-Baylor TX-
1252 AM CDT Mon May 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN TILLMAN...
NORTHWESTERN ARCHER...WICHITA...SOUTHEASTERN WILBARGER AND
NORTHEASTERN BAYLOR COUNTIES IS CANCELLED...
             
The storms which prompted the warning have weakened below severe
limits, therefore the warning has been cancelled.  However gusty
winds and heavy rain are still possible with these thunderstorms.

LAT...LON 3433 9861 3382 9862 3352 9887 3363 9932
      3382 9921 3424 9918
TIME...MOT...LOC 0551Z 270DEG 33KT 3409 9878 3381 9877 3359 9891 

$$

11

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Clay	52 min
May 16, 7:42 PM CDT	Special Weather Statement	OUN	Foard	33 min
May 16, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Foard	16 min
May 16, 8:10 PM CDT	Severe Thunderstorm Warning	OUN	Clay	65 min
May 16, 8:52 PM CDT	Areal Flood Advisory	OUN	Clay	3 hr
May 16, 9:04 PM CDT	Severe Thunderstorm Warning	OUN	Clay	56 min
May 16, 9:22 PM CDT	Special Weather Statement	OUN	Archer	23 min
May 16, 9:29 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Clay	61 min
May 16, 9:59 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman, Knox	76 min
May 16, 10:31 PM CDT	Severe Thunderstorm Warning	OUN	Knox	44 min
May 16, 11:06 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Knox	39 min
May 16, 11:13 PM CDT	Special Weather Statement	OUN	Foard, Knox	32 min
May 16, 11:32 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Foard, Knox, Wilbarger	58 min
May 16, 11:38 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	52 min
May 16, 11:44 PM CDT	Special Weather Statement	OUN	Wilbarger	31 min
May 17, 12:25 AM CDT	Areal Flood Advisory	OUN	Baylor, Foard, Knox, Wilbarger	3 hr
May 17, 12:55 AM CDT	Special Weather Statement	OUN	Archer, Wichita	35 min
May 17, 1:28 AM CDT	Special Weather Statement	OUN	Clay	32 min
May 17, 2:25 PM CDT	River Flood Advisory	OUN	Wichita, Wilbarger	18 hr
May 17, 5:13 PM CDT	Special Weather Statement	OUN	Knox	32 min
May 17, 5:45 PM CDT	Special Weather Statement	OUN	Knox	30 min
May 17, 6:05 PM CDT	Special Weather Statement	OUN	Foard	40 min
May 17, 6:18 PM CDT	Special Weather Statement	OUN	Foard	42 min
May 17, 6:23 PM CDT	Severe Thunderstorm Warning	OUN	Knox	67 min
May 17, 6:39 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman, Wilbarger	12 min
May 16, 7:09 PM CDT	Special Weather Statement	OUN	Marshall	36 min
May 16, 7:46 PM CDT	Special Weather Statement	OUN	Marshall	29 min
May 16, 8:06 PM CDT	River Flood Advisory	OUN	Pottawatomie, Seminole	16 hr
May 16, 8:06 PM CDT	River Flood Advisory	OUN	Atoka	24 hr
May 16, 8:21 PM CDT	Areal Flood Warning	OUN	Jefferson, Stephens	4 hr
May 16, 9:56 PM CDT	Areal Flood Warning	OUN	Jefferson	3 hr
May 17, 12:15 AM CDT	Special Weather Statement	OUN	Tillman	30 min
May 17, 12:29 AM CDT	Severe Thunderstorm Warning	OUN	Comanche, Kiowa, Tillman	22 min
May 17, 2:01 AM CDT	Special Weather Statement	OUN	Jefferson, Stephens	29 min
May 17, 12:39 PM CDT	River Flood Advisory	OUN	Comanche, Cotton	20 hr
May 17, 2:27 PM CDT	River Flood Advisory	OUN	Cotton	18 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2021 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.