Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 162, NWS Norman, OK

May 3, 2021Pottawatomie County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 3, 2021, 8:39 PM CDT for Pottawatomie County, Oklahoma. It was in force for 51 min. 3 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: May 3, 2021, 8:39 PM CDT (01:39 UTC)
Expired: May 3, 2021, 9:30 PM CDT
In force: 51 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Pottawatomie County, OK

The radar

The Norman radar (KTLX), 33 km from the middle of the area, began a volume at 01:40 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
May 3, 8:48 PM CDT	HAIL 1.75	3 W Tecumseh, OK
May 3, 8:55 PM CDT	HAIL 1	4 Se Bethel Acres, OK
May 3, 9:10 PM CDT	HAIL 1.25	3 Nw Shawnee, OK

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

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 1.7 hours before the alert went out and 269 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: 3299 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1213 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 150 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 2.6
Supercell composite: 13.9

Open this sounding in Storm Lab

The text

As transmitted.

800 
WUUS54 KOUN 040139
SVROUN
OKC125-040230-
/O.NEW.KOUN.SV.W.0162.210504T0139Z-210504T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
839 PM CDT Mon May 3 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Central Pottawatomie County in central Oklahoma...

* Until 930 PM CDT.

* At 839 PM CDT, a severe thunderstorm was located near Brooksville,
  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...
  Shawnee, Tecumseh, Earlsboro, Brooksville, Macomb, Bethel Acres and
  Harjo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3512 9701 3519 9710 3541 9695 3536 9677
      3520 9678
TIME...MOT...LOC 0139Z 208DEG 15KT 3521 9700 

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

Mahale

3 follow-up statements

436 
WWUS54 KOUN 040145
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
845 PM CDT Mon May 3 2021

OKC125-040230-
/O.CON.KOUN.SV.W.0162.000000T0000Z-210504T0230Z/
Pottawatomie OK-
845 PM CDT Mon May 3 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR CENTRAL POTTAWATOMIE COUNTY...

At 845 PM CDT, a severe thunderstorm was located near Tecumseh,
moving north at 20 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...
Shawnee, Tecumseh, Earlsboro, Brooksville, Bethel Acres and Harjo. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3514 9696 3520 9709 3541 9695 3536 9677
      3520 9678
TIME...MOT...LOC 0145Z 202DEG 19KT 3525 9697 

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

Mahale

176 
WWUS54 KOUN 040202
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
902 PM CDT Mon May 3 2021

OKC125-040230-
/O.CON.KOUN.SV.W.0162.000000T0000Z-210504T0230Z/
Pottawatomie OK-
902 PM CDT Mon May 3 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR NORTHWESTERN POTTAWATOMIE COUNTY...

At 902 PM CDT, a severe thunderstorm was located near Shawnee, moving
northeast at 15 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...
Shawnee, Tecumseh and Bethel Acres. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

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

&&

LAT...LON 3541 9695 3536 9677 3522 9691 3525 9706
TIME...MOT...LOC 0202Z 208DEG 15KT 3531 9693 

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

Mahale

687 
WWUS54 KOUN 040221
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
921 PM CDT Mon May 3 2021

OKC125-040230-
/O.EXP.KOUN.SV.W.0162.000000T0000Z-210504T0230Z/
Pottawatomie OK-
921 PM CDT Mon May 3 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN POTTAWATOMIE
COUNTY WILL EXPIRE AT 930 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

Remember, a Severe Thunderstorm Warning still remains in effect for
far northern Pottawatomie County. 

LAT...LON 3541 9695 3536 9677 3522 9691 3525 9706
TIME...MOT...LOC 0220Z 208DEG 15KT 3537 9689 

$$

Mahale

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 7:02 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	43 min
May 3, 7:07 PM CDT	Tornado Warning	OUN	Coal	26 min
May 3, 7:13 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray, Pontotoc	47 min
May 3, 7:22 PM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Hughes, Johnston, Pontotoc, Seminole	3 hr
May 3, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	37 min
May 3, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Pontotoc	43 min
May 3, 7:41 PM CDT	Flash Flood Warning	OUN	Coal, Pontotoc	3 hr
May 3, 7:52 PM CDT	Special Weather Statement	OUN	Seminole	23 min
May 3, 7:55 PM CDT	Special Weather Statement	OUN	Pontotoc	35 min
May 3, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	46 min
May 3, 8:06 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie, Seminole	39 min
May 3, 8:07 PM CDT	Tornado Warning	OUN	Atoka	8 min
May 3, 8:14 PM CDT	Special Weather Statement	OUN	Pottawatomie	46 min
May 3, 8:26 PM CDT	Special Weather Statement	OUN	Marshall	34 min
May 3, 8:33 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	42 min
May 3, 8:36 PM CDT	Severe Thunderstorm Warning	OUN	Bryan, Johnston, Marshall	39 min
May 3, 8:46 PM CDT	Special Weather Statement	OUN	Atoka	29 min
May 3, 8:48 PM CDT	Special Weather Statement	OUN	Coal	27 min
May 3, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	50 min
May 3, 8:56 PM CDT	Flash Flood Warning	OUN	Atoka, Coal	3 hr
May 3, 8:57 PM CDT	Tornado Warning	OUN	Atoka	33 min
May 3, 9:03 PM CDT	Areal Flood Advisory	OUN	Pottawatomie	3 hr
May 3, 9:09 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Pottawatomie	51 min
May 3, 9:24 PM CDT	Special Weather Statement	OUN	Garvin	36 min
May 3, 9:30 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	45 min
May 3, 9:32 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc, Pottawatomie	43 min
May 3, 9:44 PM CDT	Special Weather Statement	OUN	Hughes	31 min
May 3, 10:04 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	41 min
May 3, 10:32 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Payne	43 min
May 3, 10:36 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	54 min
May 3, 11:09 PM CDT	Severe Thunderstorm Warning	OUN	Noble, Payne	31 min
May 3, 11:15 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	45 min
May 3, 11:34 PM CDT	Special Weather Statement	OUN	Cleveland	26 min
May 3, 11:53 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	52 min
May 3, 11:56 PM CDT	Special Weather Statement	OUN	Jefferson, Stephens	64 min
May 4, 12:12 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Stephens	48 min
May 4, 12:18 AM CDT	Special Weather Statement	OUN	Payne	42 min
May 4, 12:28 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson	47 min
May 4, 12:40 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray	50 min
May 4, 12:43 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love	29 min
May 4, 12:49 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	41 min
May 4, 1:05 AM CDT	Special Weather Statement	OUN	Love	40 min
May 4, 1:20 AM CDT	Special Weather Statement	OUN	Cleveland	25 min
May 4, 1:23 AM CDT	Severe Thunderstorm Warning	OUN	Johnston, Murray, Pontotoc	52 min
May 4, 1:55 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Pontotoc	50 min
May 4, 2:00 AM CDT	Special Weather Statement	OUN	Hughes	45 min
May 4, 2:31 AM CDT	Special Weather Statement	OUN	Coal	29 min
May 4, 1:47 PM CDT	River Flood Advisory	OUN	Atoka	19 hr

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.