Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 82, NWS Norman, OK

April 9, 20216 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 9, 2021, 8:38 PM CDT for 6 counties in Oklahoma. It was in force for 67 min. 2 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: Apr 9, 2021, 8:38 PM CDT (01:38 UTC)
Expired: Apr 9, 2021, 9:45 PM CDT
In force: 67 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 80.0 mph

Counties Atoka County, OK, Bryan County, OK, Coal County, OK, Hughes County, OK, Johnston County, OK, Marshall County, OK

The radar

The Norman radar (KTLX), 141 km from the middle of the area, began a volume at 01:39 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
Apr 9, 8:39 PM CDT	HAIL 1	Bromide, OK
Apr 9, 9:29 PM CDT	HAIL 1	Durant, 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
Apr 9, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.6 hours before the alert went out and 143 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: 1392 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 1212 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

As transmitted.

801 
WUUS54 KOUN 100138
SVROUN
OKC005-013-029-063-069-095-100245-
/O.NEW.KOUN.SV.W.0082.210410T0138Z-210410T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
838 PM CDT Fri Apr 9 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Johnston County in southeastern Oklahoma...
  Northwestern Bryan County in southeastern Oklahoma...
  Coal County in southeastern Oklahoma...
  Marshall County in southeastern Oklahoma...
  Atoka County in southeastern Oklahoma...
  Southeastern Hughes County in southeastern Oklahoma...

* Until 945 PM CDT.

* At 837 PM CDT, severe thunderstorms were located along a line
  extending from near Stuart to 3 miles south of Centrahoma to 6 
  miles south of Mannsville, moving southeast at 30 mph. The most 
  dangerous part of the storm is across eastern Hughes county, near 
  Stuart. 

  These are very dangerous storms.

  HAZARD...80 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be heavily damaged. Expect 
           considerable damage to roofs, windows, and vehicles. 
           Extensive tree damage and power outages are likely.

* Locations impacted include...
  Durant, Madill, Atoka, Tishomingo, Coalgate, Kingston, Caddo,
  Mannsville, Ravia, Wapanucka, Stringtown, Lehigh, Silo, Milburn,
  Tushka, Caney, Kenefic, Stuart, Bromide and Mead.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3451 9567 3451 9578 3435 9578 3386 9644
      3408 9697 3415 9697 3460 9640 3492 9617
      3499 9609 3468 9609 3468 9589 3459 9588
      3459 9567
TIME...MOT...LOC 0137Z 309DEG 24KT 3490 9607 3455 9634 3409 9689 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...80MPH
 
$$

Mahale

4 follow-up statements

172 
WWUS54 KOUN 100147
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
847 PM CDT Fri Apr 9 2021

OKC063-100156-
/O.CAN.KOUN.SV.W.0082.000000T0000Z-210410T0245Z/
Hughes OK-
847 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HUGHES COUNTY IS
CANCELLED...

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

LAT...LON 3451 9567 3451 9578 3435 9578 3386 9644
      3408 9697 3410 9697 3453 9641 3477 9617
      3477 9609 3468 9609 3468 9589 3459 9588
      3459 9567
TIME...MOT...LOC 0146Z 307DEG 27KT 3485 9598 3450 9625 3404 9680 

$$

OKC005-013-029-069-095-100245-
/O.CON.KOUN.SV.W.0082.000000T0000Z-210410T0245Z/
Johnston OK-Bryan OK-Coal OK-Marshall OK-Atoka OK-
847 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR SOUTHEASTERN JOHNSTON...NORTHWESTERN BRYAN...COAL...NORTHERN
MARSHALL AND ATOKA COUNTIES...

At 846 PM CDT, severe thunderstorms were located along a line
extending from 3 miles southwest of Haywood to near Lehigh to 4 miles
south of Madill, moving southeast at 30 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...
Durant, Madill, Atoka, Tishomingo, Coalgate, Kingston, Caddo, Ravia,
Wapanucka, Stringtown, Lehigh, Silo, Milburn, Tushka, Caney, Kenefic,
Bromide, Mead, Armstrong and Clarita.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3451 9567 3451 9578 3435 9578 3386 9644
      3408 9697 3410 9697 3453 9641 3477 9617
      3477 9609 3468 9609 3468 9589 3459 9588
      3459 9567
TIME...MOT...LOC 0146Z 307DEG 27KT 3485 9598 3450 9625 3404 9680 

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

Mahale

396 
WWUS54 KOUN 100202
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
902 PM CDT Fri Apr 9 2021

OKC005-013-029-069-095-100245-
/O.CON.KOUN.SV.W.0082.000000T0000Z-210410T0245Z/
Johnston OK-Bryan OK-Coal OK-Marshall OK-Atoka OK-
902 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR SOUTHEASTERN JOHNSTON...NORTHWESTERN BRYAN...SOUTHEASTERN COAL...
NORTHERN MARSHALL AND ATOKA COUNTIES...

At 901 PM CDT, severe thunderstorms were located along a line
extending from 3 miles southeast of Wardville to 4 miles east of
Lehigh to near Kingston, moving southeast at 30 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...
Durant, Madill, Atoka, Coalgate, Kingston, Caddo, Stringtown, Lehigh,
Silo, Milburn, Tushka, Caney, Kenefic, Mead, Armstrong, Fillmore,
Wardville, Lane, Woodville and Coleman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3451 9567 3451 9578 3435 9578 3386 9644
      3405 9690 3411 9674 3446 9630 3462 9618
      3468 9609 3468 9589 3459 9588 3459 9567
TIME...MOT...LOC 0201Z 302DEG 27KT 3461 9599 3445 9615 3399 9670 

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

Mahale

013 
WWUS54 KOUN 100206
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
906 PM CDT Fri Apr 9 2021

OKC005-013-029-069-095-100245-
/O.CON.KOUN.SV.W.0082.000000T0000Z-210410T0245Z/
Johnston OK-Bryan OK-Coal OK-Marshall OK-Atoka OK-
906 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR SOUTHEASTERN JOHNSTON...NORTHWESTERN BRYAN...SOUTHEASTERN COAL...
NORTHEASTERN MARSHALL AND ATOKA COUNTIES...

At 906 PM CDT, severe thunderstorms were located along a line
extending from 7 miles southeast of Wardville to 3 miles southwest of
Stringtown to near Woodville, moving southeast at 30 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Durant, Atoka, Kingston, Caddo, Stringtown, Silo, Tushka, Caney,
Kenefic, Mead, Armstrong, Wardville, Lane, Woodville, Coleman, Daisy,
Little City, Nida, northeastern Lake Texoma and Calera.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3451 9567 3451 9578 3435 9578 3386 9644
      3401 9681 3412 9663 3441 9626 3468 9601
      3468 9589 3459 9588 3459 9567
TIME...MOT...LOC 0206Z 306DEG 28KT 3458 9592 3442 9608 3396 9663 

HAIL...0.75IN
WIND...60MPH
 
$$

Mahale

930 
WWUS54 KOUN 100224
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
924 PM CDT Fri Apr 9 2021

OKC029-069-095-100233-
/O.CAN.KOUN.SV.W.0082.000000T0000Z-210410T0245Z/
Johnston OK-Coal OK-Marshall OK-
924 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JOHNSTON...
SOUTHEASTERN COAL AND NORTHEASTERN MARSHALL COUNTIES IS CANCELLED...

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

LAT...LON 3451 9567 3451 9578 3435 9578 3386 9644
      3392 9658 3427 9616 3459 9582 3459 9567
TIME...MOT...LOC 0223Z 303DEG 30KT 3451 9575 3429 9598 3389 9646 

$$

OKC005-013-100245-
/O.CON.KOUN.SV.W.0082.000000T0000Z-210410T0245Z/
Bryan OK-Atoka OK-
924 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR NORTHWESTERN BRYAN AND CENTRAL ATOKA COUNTIES...

At 923 PM CDT, severe thunderstorms were located along a line
extending from near Daisy to near Lane to 3 miles northeast of
Colbert, moving southeast 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...
Durant, Caddo, Caney, Armstrong, Lane, Daisy, eastern Lake Texoma,
Calera, McGee Creek Lake, Redden and Bentley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3451 9567 3451 9578 3435 9578 3386 9644
      3392 9658 3427 9616 3459 9582 3459 9567
TIME...MOT...LOC 0223Z 303DEG 30KT 3451 9575 3429 9598 3389 9646 

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
Apr 9, 7:08 PM CDT	Severe Thunderstorm Warning	OUN	McClain, Pontotoc, Pottawatomie, Seminole	52 min
Apr 9, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Pontotoc, Pottawatomie, Seminole	33 min
Apr 9, 7:35 PM CDT	Special Weather Statement	OUN	Marshall	25 min
Apr 9, 7:36 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Love, Marshall	39 min
Apr 9, 7:39 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	51 min
Apr 9, 7:51 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Johnston, Murray, Pontotoc, Seminole	54 min
Apr 9, 8:07 PM CDT	Severe Thunderstorm Warning	OUN	Love, Marshall	53 min
Apr 9, 8:11 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Coal, Johnston, Marshall, Murray, Pontotoc	34 min
Apr 9, 9:15 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Marshall	60 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.