Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 279, NWS Tulsa, OK

July 11, 20204 counties in Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 11, 2020, 10:24 PM CDT for 4 counties in Oklahoma. It was in force for 19 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: Jul 11, 2020, 10:24 PM CDT (03:24 UTC)
Expired: Jul 11, 2020, 10:43 PM CDT
In force: 19 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 21 km from the middle of the area, began a volume at 03:28 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 11, 6:08 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 3.4 hours before the alert went out and 184 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: 2598 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 1473 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

584 
WUUS54 KTSA 120324
SVRTSA
OKC131-143-145-147-120415-
/O.NEW.KTSA.SV.W.0279.200712T0324Z-200712T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
1024 PM CDT Sat Jul 11 2020

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Rogers County in northeastern Oklahoma...
  Southern Washington County in northeastern Oklahoma...
  Northwestern Wagoner County in northeastern Oklahoma...
  Eastern Tulsa County in northeastern Oklahoma...

* Until 1115 PM CDT.

* At 1024 PM CDT, severe thunderstorms were located along a line
  extending from near Ramona to 2 miles north of Owasso to 3 miles
  south of Tulsa, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations in or near the path include...
  Tulsa...                          Broken Arrow...
  Claremore...                      Owasso...
  Bixby...                          Jenks...
  Coweta...                         Skiatook...
  Catoosa...                        Collinsville...
  Verdigris...                      Inola...
  Oologah...                        Ramona...
  Foyil...                          Talala...
  Vera...                           Jenks Riverside Airport...
  Tulsa International Airport...    Taiwah...

This includes Interstate 44 between mile markers 221 and 258.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Tulsa.

&&

LAT...LON 3628 9544 3590 9548 3601 9602 3630 9594
      3652 9600 3658 9600 3659 9547
TIME...MOT...LOC 0324Z 269DEG 35KT 3652 9592 3630 9585 3608 9592 

HAIL...<.75IN
WIND...60MPH
 
$$

2 follow-up statements

726 
WWUS54 KTSA 120337
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
1037 PM CDT Sat Jul 11 2020

OKC147-120346-
/O.CAN.KTSA.SV.W.0279.000000T0000Z-200712T0415Z/
Washington OK-
1037 PM CDT Sat Jul 11 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WASHINGTON COUNTY IS
CANCELLED...

The storms which prompted the warning have weakened.  Therefore the 
warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
northeastern Oklahoma.

LAT...LON 3628 9544 3590 9548 3601 9602 3630 9594
      3642 9597 3642 9547
TIME...MOT...LOC 0336Z 268DEG 35KT 3642 9579 3630 9573 3598 9583 

$$

OKC131-143-145-120415-
/O.CON.KTSA.SV.W.0279.000000T0000Z-200712T0415Z/
Rogers OK-Wagoner OK-Tulsa OK-
1037 PM CDT Sat Jul 11 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR SOUTHWESTERN ROGERS...NORTHWESTERN WAGONER AND EASTERN TULSA
COUNTIES...

At 1036 PM CDT, severe thunderstorms were located along a line
extending from 4 miles southwest of Oologah to 5 miles northwest of
Verdigris to 3 miles northeast of Bixby, moving east at 40 mph.

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

SOURCE...Radar indicated.

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

Locations in or near the path include...
Tulsa...                          Broken Arrow...
Claremore...                      Owasso...
Bixby...                          Jenks...
Coweta...                         Skiatook...
Catoosa...                        Collinsville...
Verdigris...                      Inola...
Jenks Riverside Airport...        Tulsa International Airport...
Taiwah...                         Tiawah...
Oneta...                          Turley...

This includes Interstate 44 between mile markers 221 and 257.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Tulsa.

&&

LAT...LON 3628 9544 3590 9548 3601 9602 3630 9594
      3642 9597 3642 9547
TIME...MOT...LOC 0336Z 268DEG 35KT 3642 9579 3630 9573 3598 9583 

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

001 
WWUS54 KTSA 120343
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
1043 PM CDT Sat Jul 11 2020

OKC131-143-145-120353-
/O.CAN.KTSA.SV.W.0279.000000T0000Z-200712T0415Z/
Rogers OK-Wagoner OK-Tulsa OK-
1043 PM CDT Sat Jul 11 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ROGERS...
NORTHWESTERN WAGONER AND EASTERN TULSA COUNTIES IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning has been cancelled.  However gusty winds and
heavy rain are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
northeastern Oklahoma.

LAT...LON 3628 9544 3590 9548 3601 9602 3630 9594
      3642 9597 3642 9547
TIME...MOT...LOC 0342Z 269DEG 35KT 3642 9572 3630 9566 3598 9576 

$$

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Tulsa, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 11, 10:03 PM CDT, 21 minutes earlier.

Area forecast discussion, Jul 11, 10:03 PM CDT, 21 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
1003 PM CDT Sat Jul 11 2020

.DISCUSSION...
MCS along a Pawnee to FSM line continues to push southward with
continued reports of severe weather along the line. Expanded severe
thunderstorm watch southward to include all but Pushmataha and
Choctaw Counties, which may need to be added at a later time. Very
strong instability remains in place south of the convection, and deep
layer shear remains unseasonably strong. Expect severe weather
potential to persist until after midnight, with damaging wind threat
most likely hazard as cold pool surges south, and strong embedded
cells potentially producing large hail. Adjusted forecast based on
expected convective trends remainder of the night. Isolated heavy
rainfall rates/amounts will result in some flash flooding, but we
don't believe threat is widespread enough at this time to warrant a
flash flood watch.

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...None.
AR...None.
&&

SHORT TERM...69

Hazardous weather outlook, Jul 11, 4:44 PM CDT, 5 hours 40 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
444 PM CDT Sat Jul 11 2020

ARZ001-002-010-011-019-020-029-OKZ049-053>076-121030-
Adair OK-Benton AR-Carroll AR-Cherokee OK-Choctaw OK-Craig OK-
Crawford AR-Creek OK-Delaware OK-Franklin AR-Haskell OK-Latimer OK-
Le Flore OK-Madison AR-Mayes OK-McIntosh OK-Muskogee OK-Nowata OK-
Okfuskee OK-Okmulgee OK-Osage OK-Ottawa OK-Pawnee OK-Pittsburg OK-
Pushmataha OK-Rogers OK-Sebastian AR-Sequoyah OK-Tulsa OK-Wagoner OK-
Washington OK-Washington AR-
444 PM CDT Sat Jul 11 2020

...SEVERE WEATHER LIKELY THIS EVENING...

This Outlook is for Northwest and West Central Arkansas as well as
much of Eastern Oklahoma.

.DAY ONE...This Afternoon and Tonight.
TORNADO.
	RISK...Limited.
	AREA...Mainly north of Highway 412.
	ONSET...After 7 pm.

SEVERE THUNDERSTORM.
	RISK...Critical.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...After 7 pm.
	AREA AT GREATEST RISK...North of I-40.

HEAVY RAIN.
	RISK...Limited.
	AREA...Northeast Oklahoma and Northwest Arkansas.
	ONSET...After 7 pm.

DANGEROUS HEAT.
	RISK...Significant.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...Ongoing.
	AREA AT GREATEST RISK...Eastern Oklahoma and West Central Arkansas.

DISCUSSION...
Severe weather is expected to develop into northeastern Oklahoma and
northwest Arkansas this evening through early tonight. The primary
threat will be damaging wind gusts up to 70 mph, with a lesser threat
of large hail. There is also a non-zero threat of isolated tornadoes
in areas closer to the Kansas and Missouri borders this evening.

A complex of severe storms is expected to develop over south central
Kansas and north central Oklahoma by early this evening, and will
move southeast across northeast Oklahoma and northwest Arkansas
during the evening and tonight. Very strong instability and strong
wind shear will favor organized and potentially significant severe
weather, perhaps as far south as I-40, with lesser chances to the
south. Thunderstorms will continue to push into southeastern Oklahoma
and west central Arkansas through late tonight.

Dangerous heat is ongoing this afternoon across much of eastern
Oklahoma and west central Arkansas, with heat index values in the 110
to 116 degree range. An Excessive Heat Warning is in effect for much
of the area through 9 pm this evening. Conditions will improve by
late evening as temperatures cool, and thunderstorms begin to push
into the area.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Activation of the Regional Spotter Network Expected.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.
SUNDAY...Thunderstorm Potential...Dangerous Heat Potential.
MONDAY...Dangerous Heat Potential.
TUESDAY...Thunderstorm Potential...Dangerous Heat Potential.
WEDNESDAY through FRIDAY...Dangerous Heat Potential.

EXTENDED DISCUSSION...
Thunderstorms are expected to continue to affect southeastern
Oklahoma and west central Arkansas Sunday morning into the
afternoon, as the cold front slowly passes through the region. There
is a limited risk of severe weather with this activity.

The heat will become the main concern next week, especially Tuesday
through Friday with heat index values in the 100 to 110 degree
range across eastern Oklahoma and western Arkansas during this
time.

weather.gov/tulsa contains additional information.

69

In the hours before

Local storm report, Jul 11, 9:58 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
958 PM CDT SAT JUL 11 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0957 PM     TSTM WND GST     SAPULPA                 36.00N 96.11W
07/11/2020  E70 MPH          CREEK              OK   AMATEUR RADIO

            WIND GUST REPORTED AT MAIN AND TAFT IN SAPULPA

&&

LACY

Local storm report, Jul 11, 9:59 PM CDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
959 PM CDT SAT JUL 11 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0943 PM     TSTM WND GST     SALLISAW                35.46N 94.79W
07/11/2020  E62 MPH          SEQUOYAH           OK   EMERGENCY MNGR

            REPORTED AT SALLISAW EOC

&&

LACY

Local storm report, Jul 11, 10:01 PM CDT, 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1001 PM CDT SAT JUL 11 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0920 PM     TSTM WND DMG     STILWELL                35.81N 94.63W
07/11/2020                   ADAIR              OK   BROADCAST MEDIA

            TREES DOWN IN STILWELL...TIME ESTIMATED BY RADAR

&&

LACY

Local storm report, Jul 11, 10:11 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1011 PM CDT SAT JUL 11 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1009 PM     TSTM WND GST     3 N MULDROW             35.45N 94.60W
07/11/2020  M70 MPH          SEQUOYAH           OK   TRAINED SPOTTER

&&

LACY

Local storm report, Jul 11, 10:13 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1013 PM CDT SAT JUL 11 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1008 PM     TSTM WND DMG     SALLISAW                35.46N 94.79W
07/11/2020                   SEQUOYAH           OK   LAW ENFORCEMENT

            LARGE TREE AND POWER POLE DOWN AT REDWOOD AND WHEELER

&&

LACY

Local storm report, Jul 11, 10:24 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1024 PM CDT SAT JUL 11 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1015 PM     TSTM WND GST     OKMULGEE                35.62N 95.96W
07/11/2020  M63 MPH          OKMULGEE           OK   AWOS

            MEASURED AT OKMULGEE AIRPORT

&&

LACY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 7:22 PM CDT	Special Weather Statement	TSA	Nowata	23 min
Jul 11, 7:34 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Rogers, Washington	41 min
Jul 11, 7:38 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Ottawa, Rogers	52 min
Jul 11, 7:44 PM CDT	Severe Thunderstorm Warning	TSA	Delaware	46 min
Jul 11, 7:55 PM CDT	Severe Thunderstorm Warning	TSA	Delaware, Mayes	50 min
Jul 11, 8:00 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Washington	30 min
Jul 11, 8:12 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	48 min
Jul 11, 8:21 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Delaware, Mayes, Rogers, Wagoner	24 min
Jul 11, 8:26 PM CDT	Special Weather Statement	TSA	Rogers	34 min
Jul 11, 8:27 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Delaware	33 min
Jul 11, 8:31 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	44 min
Jul 11, 8:36 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Wagoner	39 min
Jul 11, 8:46 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware, Mayes, Rogers, Wagoner	44 min
Jul 11, 8:55 PM CDT	Severe Thunderstorm Warning	TSA	Adair	35 min
Jul 11, 9:02 PM CDT	Special Weather Statement	TSA	Wagoner	28 min
Jul 11, 9:10 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Muskogee, Wagoner	35 min
Jul 11, 9:13 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Muskogee, Okmulgee, Osage, Rogers, Tulsa and 1 more	47 min
Jul 11, 9:15 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa	45 min
Jul 11, 9:18 PM CDT	Severe Thunderstorm Warning	TSA	Adair	12 min
Jul 11, 9:27 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Muskogee, Sequoyah	48 min
Jul 11, 9:34 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Mayes, Rogers, Wagoner	26 min
Jul 11, 9:49 PM CDT	Areal Flood Advisory	TSA	Craig, Mayes, Nowata, Rogers, Tulsa, Wagoner and 1 more	3 hr
Jul 11, 9:50 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee, Tulsa	40 min
Jul 11, 9:54 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	51 min
Jul 11, 9:56 PM CDT	Special Weather Statement	TSA	Haskell, Muskogee	49 min
Jul 11, 10:00 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Tulsa, Wagoner	30 min
Jul 11, 10:02 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Tulsa, Washington	28 min
Jul 11, 10:07 PM CDT	Flash Flood Warning	TSA	Tulsa	3 hr
Jul 11, 10:19 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, McIntosh, Muskogee, Okmulgee, Pittsburg	41 min
Jul 11, 10:29 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore	46 min
Jul 11, 10:32 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	43 min
Jul 11, 10:35 PM CDT	Special Weather Statement	TSA	Osage, Pawnee	25 min
Jul 11, 10:40 PM CDT	Special Weather Statement	TSA	Okfuskee	35 min
Jul 11, 10:48 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	42 min
Jul 11, 10:53 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pushmataha	52 min
Jul 11, 10:55 PM CDT	Special Weather Statement	TSA	Creek, Washington	50 min
Jul 11, 11:00 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, McIntosh, Muskogee, Okmulgee, Pittsburg and 1 more	45 min
Jul 11, 11:12 PM CDT	Areal Flood Advisory	TSA	Creek, Osage, Tulsa	3 hr
Jul 11, 11:17 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore	28 min
Jul 11, 11:19 PM CDT	Special Weather Statement	TSA	Creek	26 min
Jul 11, 11:22 PM CDT	Special Weather Statement	TSA	Rogers	23 min
Jul 11, 11:40 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	50 min
Jul 11, 11:44 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Latimer, LeFlore, Pittsburg, Pushmataha	46 min
Jul 11, 11:46 PM CDT	Special Weather Statement	TSA	Rogers	29 min
Jul 12, 12:04 AM CDT	Special Weather Statement	TSA	Choctaw	26 min
Jul 12, 12:10 AM CDT	Special Weather Statement	TSA	Cherokee	35 min
Jul 12, 12:15 AM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	45 min
Jul 12, 12:22 AM CDT	Special Weather Statement	TSA	Hughes	23 min
Jul 12, 1:07 AM CDT	Special Weather Statement	TSA	Choctaw	23 min
Jul 12, 3:15 AM CDT	Heat Advisory	TSA	Choctaw, Pushmataha	16 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020 Every severe thunderstorm warning in 2020

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.