Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 537, NWS Norman, OK

October 15, 2021Cleveland County, McClain County, Oklahoma County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 15, 2021, 12:12 AM CDT for Cleveland County, McClain County, Oklahoma County, Oklahoma. It was in force for 48 min. 12 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: Oct 15, 2021, 12:12 AM CDT (05:12 UTC)
Expired: Oct 15, 2021, 1:00 AM CDT
In force: 48 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.5 in
Wind: 70.0 mph

Counties Cleveland County, OK, McClain County, OK, Oklahoma County, OK

The radar

The Norman radar (KTLX), 19 km from the middle of the area, began a volume at 05:15 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	Remark
Oct 15, 12:13 AM CDT	TSTM WND DMG	6 E Mustang, OK	DAMAGE TO HANGER AT WILL ROGERS AIRPORT.
Oct 15, 12:13 AM CDT	TSTM WND GST 70	6 E Mustang, OK
Oct 15, 12:15 AM CDT	TSTM WND DMG	4 Sw Oklahoma City, OK	DELAYED REPORT. THE MOST CONCENTRATED AREA OF DAMAGE EXTENDS FROM THE WEST SIDE OF WILL ROGERS WORLD AIRPORT TO THE 2100-2800 BLOCK OF S. WESTERN AVE. THIS INCLUDES POWER POLES, POWER LINES, TREES, AND SIGNS BLOWN DOWN. SOME STRUCTURAL DAMAGE WITH WINDOWS BLOW
Oct 15, 12:15 AM CDT	TSTM WND DMG	7 E Mustang, OK	POWER POLE DOWN.
Oct 15, 12:20 AM CDT	TSTM WND DMG	4 W Valley Brook, OK	WINDOWS DESTROYED AND ROOF REMOVED FROM BUILDING, FOUND 100YDS AWAY.
Oct 15, 12:20 AM CDT	HAIL 1.75	4 Wsw Valley Brook, OK
Oct 15, 12:25 AM CDT	TSTM WND GST 65	Valley Brook, OK	WITH ONE-INCH HAIL.
Oct 15, 12:26 AM CDT	HAIL 1.75	Valley Brook, OK	WITH EST 65 MPH GUSTS.
Oct 15, 12:29 AM CDT	HAIL 1.75	2 Ese Valley Brook, OK
Oct 15, 12:30 AM CDT	TSTM WND DMG	1 Wsw Midwest City, OK	POWER POLES DOWN, TREES UPROOTED.
Oct 15, 12:30 AM CDT	TSTM WND GST 70	Del City, OK	MAIN AREA OF DAMAGE BETWEEN SE 15TH STREET AND E RENO AVE NEAR THE HIGH SCHOOL. NUMEROUS LARGE TREE LIMBS DOWNED, SHEET METAL ROOFING PEELED OFF OF A SHOPPING CENTER, POWER POLES LEANING. TIME ESTIMATED FROM RADAR.
Oct 15, 12:32 AM CDT	TSTM WND GST 70	1 E Del City, OK

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

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 5.2 hours before the alert went out and 22 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: 421 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1034 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

562 
WUUS54 KOUN 150512
SVROUN
OKC027-087-109-150600-
/O.NEW.KOUN.SV.W.0537.211015T0512Z-211015T0600Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
1212 AM CDT Fri Oct 15 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southern Oklahoma County in central Oklahoma...
  Northern Cleveland County in central Oklahoma...
  Northwestern McClain County in central Oklahoma...

* Until 100 AM CDT.

* At 1212 AM CDT, a severe thunderstorm was located over southwestern
  Oklahoma City, or near Will Rogers Airport, moving east at 30 mph.

  HAZARD...70 mph wind gusts and ping pong ball size hail.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Oklahoma City, Moore, Midwest City, Del City, Newcastle, Bethany,
  Choctaw, Warr Acres, Harrah, Spencer, Nichols Hills, Jones, Nicoma
  Park, Luther, Valley Brook, Tinker Air Force Base, Stanley Draper
  Lake, Newalla, Forest Park and Woodlawn Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3528 9766 3551 9767 3566 9720 3534 9715
TIME...MOT...LOC 0512Z 250DEG 26KT 3540 9757 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

30

3 follow-up statements

925 
WWUS54 KOUN 150516
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1216 AM CDT Fri Oct 15 2021

OKC027-087-109-150600-
/O.CON.KOUN.SV.W.0537.000000T0000Z-211015T0600Z/
Oklahoma OK-Cleveland OK-McClain OK-
1216 AM CDT Fri Oct 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR SOUTHERN OKLAHOMA...NORTHERN CLEVELAND AND NORTHWESTERN MCCLAIN
COUNTIES...

At 1216 AM CDT, a severe thunderstorm was located over southwestern
Oklahoma City, or near Valley Brook, moving east at 30 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Oklahoma City, Moore, Midwest City, Del City, Newcastle, Bethany,
Choctaw, Warr Acres, Harrah, Spencer, Nichols Hills, Jones, Nicoma
Park, Luther, Valley Brook, Tinker Air Force Base, Stanley Draper
Lake, Newalla, Forest Park and Woodlawn Park.

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 3528 9766 3551 9767 3566 9720 3534 9715
TIME...MOT...LOC 0516Z 250DEG 26KT 3541 9753 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

30

035 
WWUS54 KOUN 150530
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1230 AM CDT Fri Oct 15 2021

OKC087-150539-
/O.CAN.KOUN.SV.W.0537.000000T0000Z-211015T0600Z/
McClain OK-
1230 AM CDT Fri Oct 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MCCLAIN 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 3530 9749 3551 9755 3566 9720 3534 9715
TIME...MOT...LOC 0529Z 253DEG 26KT 3542 9740 

$$

OKC027-109-150600-
/O.CON.KOUN.SV.W.0537.000000T0000Z-211015T0600Z/
Oklahoma OK-Cleveland OK-
1230 AM CDT Fri Oct 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR SOUTHEASTERN OKLAHOMA AND NORTHEASTERN CLEVELAND COUNTIES...

At 1229 AM CDT, a severe thunderstorm was located over southeastern
Oklahoma City, or over Tinker Air Force Base, moving east at 30 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Oklahoma City, Moore, Midwest City, Del City, Choctaw, Harrah,
Spencer, Jones, Nicoma Park, Luther, Valley Brook, Tinker Air Force
Base, Stanley Draper Lake, Newalla, Forest Park, Lake Aluma and Smith
Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3530 9749 3551 9755 3566 9720 3534 9715
TIME...MOT...LOC 0529Z 253DEG 26KT 3542 9740 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

30

545 
WWUS54 KOUN 150544
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1244 AM CDT Fri Oct 15 2021

OKC027-109-150600-
/O.CON.KOUN.SV.W.0537.000000T0000Z-211015T0600Z/
Oklahoma OK-Cleveland OK-
1244 AM CDT Fri Oct 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 100 AM CDT
FOR SOUTHEASTERN OKLAHOMA AND NORTHEASTERN CLEVELAND COUNTIES...

At 1243 AM CDT, a severe thunderstorm was located near Choctaw,
moving east at 30 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Eastern Oklahoma City, Midwest City, Choctaw, Harrah, Spencer, Jones,
Nicoma Park, Luther, Stanley Draper Lake, Newalla and Tinker Air
Force Base.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3566 9720 3534 9715 3531 9739 3557 9740
TIME...MOT...LOC 0543Z 250DEG 26KT 3546 9728 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Zwink

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 14, 10:42 PM CDT	Special Weather Statement	OUN	Canadian	33 min
Oct 14, 11:04 PM CDT	Special Weather Statement	OUN	Kiowa	26 min
Oct 14, 11:17 PM CDT	Special Weather Statement	OUN	Canadian	28 min
Oct 14, 11:45 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	45 min
Oct 15, 12:33 AM CDT	Special Weather Statement	OUN	Cleveland	27 min
Oct 15, 12:43 AM CDT	Areal Flood Advisory	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	3 hr
Oct 15, 12:46 AM CDT	Special Weather Statement	OUN	Grady	29 min
Oct 15, 12:54 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Oklahoma, Pottawatomie	51 min
Oct 15, 1:09 AM CDT	Special Weather Statement	OUN	Cleveland, McClain	36 min
Oct 15, 1:39 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Pottawatomie, Seminole	51 min
Oct 15, 2:30 AM CDT	Special Weather Statement	OUN	Seminole	45 min
Oct 15, 3:13 AM CDT	Special Weather Statement	OUN	Hughes	47 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.