Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 311, NWS Tulsa, OK

August 10, 2020Osage County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 10, 2020, 6:57 PM CDT for Osage County, Oklahoma. It was in force for 48 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 10, 2020, 6:57 PM CDT (23:57 UTC)
Expired: Aug 10, 2020, 7:45 PM CDT
In force: 48 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Osage County, OK

The radar

The Tulsa radar (KINX), 90 km from the middle of the area, began a volume at 23:57 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.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 12.0 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: 1690 J/kg
Mixed-layer CIN: -204 J/kg
Mixed-layer LCL: 1251 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Aug 10, 6:38 PM CDT, 19 minutes earlier.

Area forecast discussion, Aug 10, 6:38 PM CDT, 19 minutes before

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Hazardous weather outlook, Aug 10, 4:42 PM CDT, 2 hours 15 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
442 PM CDT Mon Aug 10 2020

ARZ001-002-010-011-019-020-029-OKZ049-053>076-111030-
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-
442 PM CDT Mon Aug 10 2020

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

.DAY ONE...Late Afternoon and Tonight.

SEVERE THUNDERSTORM.
	RISK...Limited.
	AREA...Northeast Oklahoma and Northwest Arkansas.
	ONSET...Ongoing.

DANGEROUS HEAT.
	RISK...Elevated.
	AREA...Much of Eastern Oklahoma and West Central Arkansas.
	ONSET...Ongoing.

DISCUSSION...
Scattered thunderstorms will remain possible into the evening hours
mainly along and near the Oklahoma Kansas border and again possible
across northeast Oklahoma and northwest Arkansas into the overnight
hours. Some of these storms could become strong to severe with
locally damaging winds being the main threat. A limited potential of
localized heavy rainfall could also be possible overnight tonight.

In addition...a Heat Advisory remains in effect for much of eastern
Oklahoma and west central Arkansas through 8 PM this evening.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Local Spotter Activation May Be Needed.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
TUESDAY through Sunday...Thunderstorm Potential...Dangerous Heat
Potential.

EXTENDED DISCUSSION...
Thunderstorm chances are forecast to be ongoing across parts of
eastern Oklahoma and northwest Arkansas Tuesday morning with the
greater potential over southeast Oklahoma into northwest Arkansas.
There is a marginal potential that a few storms could again become
strong to severe with also locally heavy rainfall possible.
Periodic chances of showers and thunderstorms are forecast for
eastern Oklahoma and western Arkansas through the week and into
the weekend as a series of upper level disturbances affect the
region. Some of these thunderstorms could be strong to severe.

Hot and humid conditions will also continue across the region
this week with temperatures mostly at or above normal for
this time of year.

weather.gov/tulsa contains additional information.

In the hours before

Special weather statement, Aug 10, 2:35 PM CDT, 4 hours 22 minutes before

Special Weather Statement
National Weather Service Tulsa OK
235 PM CDT Mon Aug 10 2020

OKZ054-102000-
Osage OK-
235 PM CDT Mon Aug 10 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL OSAGE COUNTY UNTIL
300 PM CDT...

At 235 PM CDT, a strong thunderstorm was located 3 miles east of
Grainola, moving northeast at 35 mph.

Dime to penny size hail and winds in excess of 40 mph will be
possible with this storm.

Locations in or near the path include...
Elgin...                          Grainola...
Foraker...

LAT...LON 3700 9611 3698 9610 3682 9667 3700 9672
TIME...MOT...LOC 1935Z 244DEG 32KT 3695 9659

Special weather statement, Aug 10, 2:55 PM CDT, 4 hours 2 minutes before

Special Weather Statement
National Weather Service Tulsa OK
255 PM CDT Mon Aug 10 2020

OKZ054-055-102030-
Osage OK-Washington OK-
255 PM CDT Mon Aug 10 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OSAGE AND
NORTHWESTERN WASHINGTON COUNTIES UNTIL 330 PM CDT...

At 255 PM CDT, strong thunderstorms were located along a line
extending from 8 miles west of Elgin to 5 miles southwest of
Pearsonia. Movement was east at 35 mph.

Dime to penny size hail and winds in excess of 40 mph will be
possible with these storms.

Locations in or near the path include...
Bartlesville...                   Pawhuska...
Elgin...                          Foraker...
Bigheart...                       Osage Hills State Park...
Pearsonia...                      Bartlesville Municipal Airport...
Hulah...                          Okesa...
Sunset Lake...                    Wah Sha She State Park...

LAT...LON 3700 9591 3671 9601 3664 9661 3700 9659
TIME...MOT...LOC 1955Z 256DEG 30KT 3698 9644 3675 9652

Special weather statement, Aug 10, 3:26 PM CDT, 3 hours 31 minutes before

Special Weather Statement
National Weather Service Tulsa OK
326 PM CDT Mon Aug 10 2020

OKZ054>056-102115-
Osage OK-Nowata OK-Washington OK-
326 PM CDT Mon Aug 10 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OSAGE...WASHINGTON
AND NORTHERN NOWATA COUNTIES UNTIL 415 PM CDT...

At 326 PM CDT, strong thunderstorms were located along a line
extending from 4 miles northwest of Hulah to 4 miles northeast of
Osage Hills State Park to 2 miles north of Pawhuska. Movement was
east at 35 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations in or near the path include...
Bartlesville...                   Pawhuska...
Dewey...                          South Coffeyville...
Copan...                          Delaware...
Lenapah...                        Wann...
Bartlesville Municipal Airport... Hulah...
Osage Hills State Park...         Okesa...
Wah Sha She State Park...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3700 9545 3687 9550 3663 9581 3665 9642
      3680 9621 3700 9613
TIME...MOT...LOC 2026Z 262DEG 30KT 3698 9608 3681 9615 3670 9632

Special weather statement, Aug 10, 4:55 PM CDT, 2 hours 2 minutes before

Special Weather Statement
National Weather Service Tulsa OK
455 PM CDT Mon Aug 10 2020

OKZ057-058-102245-
Craig OK-Ottawa OK-
455 PM CDT Mon Aug 10 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CRAIG AND OTTAWA
COUNTIES UNTIL 545 PM CDT...

At 455 PM CDT, strong thunderstorms were located along a line
extending from 5 miles southeast of Chetopa to 8 miles north of White
Oak. Movement was east at 40 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations in or near the path include...
Miami...                          Baxter Springs...
Commerce...                       Fairland...
Afton...                          Quapaw...
Welch...                          Bluejacket...
Wyandotte...                      Treece...
Picher...                         Narcissa...
Ottawa...                         Peoria...
Cardin...                         Centrailia...
Pyramid Corners...                Twin Bridges State Park...

This includes Interstate 44 between mile markers 291 and 324.

LAT...LON 3667 9462 3667 9500 3674 9540 3700 9513
      3700 9462
TIME...MOT...LOC 2155Z 264DEG 43KT 3699 9500 3675 9528

Special weather statement, Aug 10, 5:53 PM CDT, 1 hour 4 minutes before

Special Weather Statement
National Weather Service Tulsa OK
553 PM CDT Mon Aug 10 2020

OKZ054-110000-
Osage OK-
553 PM CDT Mon Aug 10 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN OSAGE COUNTY UNTIL 700
PM CDT...

At 553 PM CDT, a strong thunderstorm was located near Hardy, moving
east-southeast at 35 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations in or near the path include...
Shidler...                        Burbank...
Elgin...                          Grainola...
Foraker...                        Bigheart...
Pearsonia...                      Eastern Kaw Lake...
Webb City...                      Wah Sha She State Park...
Apperson...

LAT...LON 3700 9601 3651 9654 3674 9684 3677 9682
      3678 9675 3700 9675
TIME...MOT...LOC 2253Z 288DEG 32KT 3694 9679

Special weather statement, Aug 10, 6:39 PM CDT, 18 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 2:55 PM CDT	Special Weather Statement	TSA	Osage	35 min
Aug 10, 3:26 PM CDT	Special Weather Statement	TSA	Nowata, Washington	49 min
Aug 10, 3:38 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Washington	52 min
Aug 10, 4:55 PM CDT	Special Weather Statement	TSA	Craig, Ottawa	50 min
Aug 10, 5:53 PM CDT	Special Weather Statement	TSA	Osage	67 min
Aug 10, 6:22 PM CDT	Severe Thunderstorm Warning	TSA	Osage	38 min
Aug 10, 6:39 PM CDT	Special Weather Statement	TSA	Franklin	36 min

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.