Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 303, NWS Tulsa, OK

July 30, 2020LeFlore County, Sequoyah County, Oklahoma; Crawford County, Sebastian County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Jul 30, 2020, 9:14 PM CDT for LeFlore County, Sequoyah County, Oklahoma; Crawford County, Sebastian County, Arkansas. It was in force for 46 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: Jul 30, 2020, 9:14 PM CDT (02:14 UTC)
Expired: Jul 30, 2020, 10:00 PM CDT
In force: 46 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Crawford County, AR, Sebastian County, AR, LeFlore County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 12 km from the middle of the area, began a volume at 02:15 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.

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 30, 4:35 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.2 hours before the alert went out and 189 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: 1022 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 Jul 30, 9:07 PM CDT, 7 minutes earlier.

Area forecast discussion, Jul 30, 9:07 PM CDT, 7 minutes before

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Hazardous weather outlook, Jul 30, 5:02 PM CDT, 4 hours 12 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
502 PM CDT Thu Jul 30 2020

ARZ001-002-010-011-019-020-029-OKZ049-053>076-311030-
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-
502 PM CDT Thu Jul 30 2020

...SEVERE STORM THREAT INCREASING ALONG AND SOUTH OF I-40 THIS
AFTERNOON AND EVENING...

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

.DAY ONE...Today and Tonight.
TORNADO.
	RISK...Very Limited.
    AREA... Southeast Oklahoma.
    ONSET... This evening.

SEVERE THUNDERSTORM.
	RISK...Elevated.
	AREA... Southeast Oklahoma and West-central Arkansas.
	ONSET... Ongoing.

FLASH FLOOD.
	RISK...Limited.
	AREA... Southeast Oklahoma.
	ONSET... Ongoing.

HEAVY RAIN.
	RISK...Limited.
	AREA... Southeast Oklahoma and west-central Arkansas.
    ONSET... Ongoing.

DANGEROUS HEAT.
	RISK...Elevated.
	AREA... Southeast Oklahoma.
	ONSET... Ongoing.

DISCUSSION...
Heat indices of 100 to 107 are ongoing across southeast Oklahoma
at this time thanks to a very hot and humid airmass and abundance
of sunshine this afternoon. A boundary in the area is starting to
trigger storms across parts of southeast Oklahoma within this
unstable airmaass. Given the favorable environment for strong to
severe storms across southeast Oklahoma, a Severe Thunderstorm
Watch has been issued and is in effect for locations in Oklahoma
south of interstate 40. The main threats this afternoon will be
damaging wind gusts up to 70 miles per hour and hail up to golf
ball size. There is also a very limited tornado threat across
southeastern Oklahoma this evening.

Heavy rainfall may also accompany these thunderstorms this
afternoon and evening across southeast Oklahoma and west-central
Arkansas. Rainfall amounts of one inch will be common with
locally higher amounts where storms move over the same area. The
Flash Flooding risk is low given the area of greatest risk for
heavier rainfall tonight has missed out on the higher rainfall
totals over the past week. With that said, if storms line up and
move over the same area, a Flash Flooding threat would
materialize.

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

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
FRIDAY...Thunderstorm Potential...Heavy Rain Potential.
SATURDAY...No Hazards.
SUNDAY...Thunderstorm Potential.
MONDAY THROUGH WEDNESDAY...No Hazards.

EXTENDED DISCUSSION...
Scattered showers and thunderstorms will remain possible on Friday
as an upper level trough moves across the region. A few lingering
showers and thunderstorms will be possible on Saturday across
northwest Arkansas, otherwise, cooler and drier weather is
anticipated into early next week.

EMERGENCY MANAGEMENT PLANNING STATEMENT...
A flash flood watch may be issued for portions of the area
later today given the threat for additional heavy rainfall. A
Severe Thunderstorm Watch is currently in effect for most
locations in Oklahoma along and south of interstate 40.

weather.gov/tulsa contains additional information.

Snider

In the hours before

Special weather statement, Jul 30, 7:44 PM CDT, 1 hour 30 minutes before

Special Weather Statement
National Weather Service Tulsa OK
744 PM CDT Thu Jul 30 2020

OKZ076-310115-
Le Flore OK-
744 PM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL LE FLORE COUNTY
UNTIL 815 PM CDT...

At 744 PM CDT, a strong thunderstorm was located 7 miles south of
Lake Wister State Park, moving east at 25 mph.

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

Locations in or near the path include...
Heavener...                       Howe...
Heavener Runestone State Park...  Hodgen...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
southeastern Oklahoma.

LAT...LON 3473 9478 3489 9485 3505 9447 3500 9444
      3480 9445
TIME...MOT...LOC 0044Z 250DEG 23KT 3483 9472

Snider

Special weather statement, Jul 30, 8:00 PM CDT, 1 hour 14 minutes before

Special Weather Statement
National Weather Service Tulsa OK
800 PM CDT Thu Jul 30 2020

OKZ049-075-310145-
Latimer OK-Pushmataha OK-
800 PM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PUSHMATAHA AND SOUTH
CENTRAL LATIMER COUNTIES UNTIL 845 PM CDT...

At 800 PM CDT, a strong thunderstorm was located over Tuskahoma,
moving northeast at 20 mph.

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

Locations in or near the path include...
Clayton...                        Albion...
Clayton Lake State Park...        Kiamichi...
Tuskahoma...                      Yanush...
Sardis...

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
southeastern Oklahoma.

LAT...LON 3462 9549 3483 9513 3475 9506 3468 9506
      3468 9500 3462 9495 3447 9535
TIME...MOT...LOC 0100Z 239DEG 17KT 3462 9530

Snider

Special weather statement, Jul 30, 8:09 PM CDT, 1 hour 5 minutes before

Special Weather Statement
National Weather Service Tulsa OK
809 PM CDT Thu Jul 30 2020

ARZ019-029-OKZ076-310145-
Sebastian AR-Crawford AR-Le Flore OK-
809 PM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL CRAWFORD...
SEBASTIAN AND NORTHEASTERN LE FLORE COUNTIES UNTIL 845 PM CDT...

At 809 PM CDT, a strong thunderstorm was located 4 miles northeast of
Howe, moving northeast at 35 mph.

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

Locations in or near the path include...
Fort Smith...                     Van Buren...
Poteau...                         Greenwood...
Barling...                        Pocola...
Heavener...                       Lavaca...
Arkoma...                         Mansfield...
Wister...                         Hackett...
Howe...                           Hartford...
Huntington...                     Bonanza...
Midland...                        Cameron...
Heavener Runestone State Park...  Excelsior...

This includes Interstate 540 between mile markers 2 and 14.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
southeastern Oklahoma.

LAT...LON 3514 9403 3514 9414 3510 9414 3506 9425
      3506 9423 3497 9423 3495 9434 3496 9437
      3494 9439 3493 9444 3486 9445 3478 9460
      3502 9480 3531 9450 3531 9448 3532 9449
      3546 9434 3524 9408 3522 9408 3519 9403
TIME...MOT...LOC 0109Z 221DEG 31KT 3498 9456

Snider

Special weather statement, Jul 30, 8:20 PM CDT, 54 minutes before

Special Weather Statement
National Weather Service Tulsa OK
820 PM CDT Thu Jul 30 2020

OKZ074-076-310145-
Haskell OK-Le Flore OK-
820 PM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN HASKELL AND
NORTHWESTERN LE FLORE COUNTIES UNTIL 845 PM CDT...

At 820 PM CDT, a strong thunderstorm was located 4 miles south of
Stigler, moving east at 40 mph.

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

Locations in or near the path include...
Stigler...                        Keota...
Mccurtain...                      Bokoshe...
Mc Curtain...                     Lequire...
Kanima...                         Milton...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
southeastern Oklahoma.

LAT...LON 3511 9473 3508 9518 3526 9522 3536 9483
      3533 9482 3532 9482 3533 9479 3534 9478
TIME...MOT...LOC 0120Z 260DEG 33KT 3518 9511

Special weather statement, Jul 30, 8:44 PM CDT, 30 minutes before

Special Weather Statement
National Weather Service Tulsa OK
844 PM CDT Thu Jul 30 2020

OKZ074-076-310215-
Haskell OK-Le Flore OK-
844 PM CDT Thu Jul 30 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN HASKELL AND NORTHERN
LE FLORE COUNTIES UNTIL 915 PM CDT...

At 843 PM CDT, a strong thunderstorm was located 5 miles west of
Bokoshe, moving east at 35 mph.

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

Locations in or near the path include...
Poteau...                         Spiro...
Panama...                         Keota...
Mccurtain...                      Bokoshe...
Cameron...                        Mc Curtain...
Shady Point...                    Cowlington...
Scullyville...                    Milton...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
southeastern Oklahoma.

LAT...LON 3506 9452 3507 9499 3523 9501 3532 9468
      3531 9468 3529 9467 3529 9464 3530 9462
      3533 9460 3533 9458
TIME...MOT...LOC 0143Z 265DEG 30KT 3516 9487

Local storm report, Jul 30, 9:06 PM CDT, 8 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
Jul 30, 7:02 PM CDT	Special Weather Statement	TSA	LeFlore	43 min
Jul 30, 7:25 PM CDT	Flash Flood Warning	TSA	Pittsburg	4 hr
Jul 30, 7:44 PM CDT	Special Weather Statement	TSA	LeFlore	31 min
Jul 30, 7:45 PM CDT	Flash Flood Warning	TSA	Pittsburg	3 hr
Jul 30, 7:52 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pittsburg, Pushmataha	38 min
Jul 30, 7:57 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Pittsburg	48 min
Jul 30, 8:00 PM CDT	Special Weather Statement	TSA	Latimer	45 min
Jul 30, 8:09 PM CDT	Special Weather Statement	TSA	LeFlore	36 min
Jul 30, 8:13 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pittsburg, Pushmataha	47 min
Jul 30, 8:20 PM CDT	Special Weather Statement	TSA	Haskell	25 min
Jul 30, 8:44 PM CDT	Special Weather Statement	TSA	Haskell	31 min
Jul 30, 8:51 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	39 min
Jul 30, 8:51 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, LeFlore, Sequoyah	24 min
Jul 30, 8:56 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Latimer, LeFlore, Pushmataha	64 min
Jul 30, 10:03 PM CDT	Special Weather Statement	TSA	Franklin	27 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2020 Severe Thunderstorm Warnings in Arkansas, 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.