Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 285, NWS Tulsa, OK

July 11, 2020Latimer County, LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 11, 2020, 11:17 PM CDT for Latimer County, LeFlore County, Oklahoma. It was in force for 28 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, 11:17 PM CDT (04:17 UTC)
Expired: Jul 11, 2020, 11:45 PM CDT
In force: 28 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Latimer County, OK, LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 66 km from the middle of the area, began a volume at 04:16 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.

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

Norman, OK (KOUN), launched 00:00Z, 4.3 hours before the alert went out and 233 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: 4218 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 1900 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 14.8

Open this sounding in Storm Lab

The text

As transmitted.

686 
WUUS54 KTSA 120417
SVRTSA
OKC077-079-120445-
/O.NEW.KTSA.SV.W.0285.200712T0417Z-200712T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
1117 PM CDT Sat Jul 11 2020

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Northeastern Latimer County in southeastern Oklahoma...
  Central Le Flore County in southeastern Oklahoma...

* Until 1145 PM CDT.

* At 1117 PM CDT, severe thunderstorms were located along a line
  extending from 6 miles east of Heavener Runestone State Park to 4
  miles southwest of Lequire, moving south at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations in or near the path include...
  Poteau...                         Heavener...
  Wister...                         Howe...
  Red Oak...                        Fanshawe...
  Talimena State Park...            Heavener Runestone State Park...
  Lake Wister State Park...         Bengal...
  Hodgen...                         Summerfield...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3480 9516 3506 9516 3499 9445 3474 9445
TIME...MOT...LOC 0417Z 358DEG 17KT 3492 9446 3504 9515 

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

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, 1 hour 14 minutes earlier.

Area forecast discussion, Jul 11, 10:03 PM CDT, 1 hour 14 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, 6 hours 33 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, 10:39 PM CDT, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1039 PM CDT SAT JUL 11 2020

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

1035 PM     TSTM WND GST     POTEAU                  35.05N 94.62W
07/11/2020  M60 MPH          LE FLORE           OK   AWOS

            MEASURED AT ROBERT S KERR AIRPORT

&&

LACY

Special weather statement, Jul 11, 10:40 PM CDT, 37 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1040 PM CDT Sat Jul 11 2020

OKZ064>066-120415-
Okmulgee OK-Okfuskee OK-Creek OK-
1040 PM CDT Sat Jul 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CREEK...WESTERN
OKMULGEE AND OKFUSKEE COUNTIES UNTIL 1115 PM CDT...

At 1039 PM CDT, the leading edge of strong winds that,are running
well out ahead of the storms, were located along a line extending
from 5 miles north of Dustin to 4 miles southeast of Stroud.
Movement was south at 50 mph.  These strong winds extend northward
into the the heavy rain areas.

Locations in or near the path include...
Bristow...                        Okemah...
Okfuskee...                       Henryetta...
Beggs...                          Boley...
Weleetka...                       Depew...
Paden...                          Bearden...
Slick...                          Castle...
Clearview...                      Okmulgee State Park...
Welty...                          Pharoah...
Bryant...                         Milfay...
Mason...

This includes the following highways,
 Interstate 40 in Oklahoma between mile markers 212 and 236.
 Interstate 44 between mile markers 178 and 191.

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

LAT...LON 3590 9662 3579 9608 3538 9599 3529 9599
      3529 9644 3546 9644 3546 9647 3543 9650
      3545 9655 3544 9657 3539 9654 3541 9658
      3540 9662
TIME...MOT...LOC 0339Z 000DEG 42KT 3535 9601 3569 9662

Local storm report, Jul 11, 10:45 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1045 PM CDT SAT JUL 11 2020

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

1030 PM     TSTM WND GST     3 ENE WISTER            34.98N 94.68W
07/11/2020  M61 MPH          LE FLORE           OK   MESONET

&&

LACY

Special weather statement, Jul 11, 10:55 PM CDT, 22 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1055 PM CDT Sat Jul 11 2020

OKZ054-055-059-060-064-120445-
Tulsa OK-Osage OK-Pawnee OK-Washington OK-Creek OK-
1055 PM CDT Sat Jul 11 2020

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN OSAGE...NORTHERN CREEK...
WESTERN WASHINGTON...SOUTHEASTERN PAWNEE AND CENTRAL TULSA COUNTIES
UNTIL 1145 PM CDT...

At 1055 PM CDT, strong thunderstorms were located along a line
extending from 5 miles north of Bigheart to 4 miles east of Hominy to
2 miles north of Shamrock. Movement was east at 15 mph.

Wind gusts of 50 to 55 mph will be possible with these storms.

Locations in or near the path include...
Tulsa...                          Bartlesville...
Sand Springs...                   Pawhuska...
Sapulpa...                        Skiatook...
Hominy...                         Dewey...
Mannford...                       Drumright...
Barnsdall...                      Sperry...
Kellyville...                     Copan...
Ramona...                         Wynona...
Ochelata...                       Avant...
Westport...                       Osage...

This includes Interstate 44 between mile markers 194 and 219.

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

LAT...LON 3700 9591 3622 9590 3583 9621 3591 9662
      3595 9662 3641 9639 3700 9633
TIME...MOT...LOC 0355Z 290DEG 14KT 3692 9626 3639 9631 3595 9658

Local storm report, Jul 11, 10:57 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1057 PM CDT SAT JUL 11 2020

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

1035 PM     TSTM WND GST     3 ENE WISTER            34.98N 94.68W
07/11/2020  M66 MPH          LE FLORE           OK   MESONET

&&

LACY

Local storm report, Jul 11, 11:02 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1102 PM CDT SAT JUL 11 2020

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

1055 PM     TSTM WND GST     OKMULGEE                35.62N 95.96W
07/11/2020  M73 MPH          OKMULGEE           OK   AWOS

&&

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, 10:24 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Wagoner, Washington	19 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, 11:19 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.