Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 168, NWS Tulsa, OK

May 4, 2020Cherokee County, Delaware County, Mayes County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 4, 2020, 6:51 PM CDT for Cherokee County, Delaware County, Mayes County, Oklahoma. It was in force for 39 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: May 4, 2020, 6:51 PM CDT (23:51 UTC)
Expired: May 4, 2020, 7:30 PM CDT
In force: 39 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 2.0 in
Wind: 70.0 mph

Counties Cherokee County, OK, Delaware County, OK, Mayes County, OK

The radar

The Tulsa radar (KINX), 50 km from the middle of the area, began a volume at 23:55 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
May 4, 2:32 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 11.9 hours before the alert went out and 133 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 190 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

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 May 4, 6:34 PM CDT, 17 minutes earlier.

Area forecast discussion, May 4, 6:34 PM CDT, 17 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
634 PM CDT Mon May 4 2020

.AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
MVFR to VFR conditions are expected Tonight even with scattered
severe thunderstorms affecting KMLC and the western Arkansas
sites through 6z. VFR conditions are anticipated on Tuesday.

&&

.PREV DISCUSSION... /Issued 231 PM CDT Mon May 4 2020/

..SEVERE WEATHER EXPECTED THIS AFTERNOON AND EVENING...

DISCUSSION...
Atmosphere has become extremely unstable this afternoon with
MLCAPES approaching 4500 J/KG just west of the area across north-
central Oklahoma. Cold front currently moving into far northwest
Osage county with pre-frontal boundary located slightly further
south, near a Ralston, Copan line. Latest CAMs and surface
analysis trends indicate scattered supercells will quickly
develop along frontal boundary in the 3-5 PM range just north of
I-44 with 0-6 KM deep layer shear remaining in 40 to 50 knot
range. Very large hail to baseballs and damaging winds to 70 mph
will be possible in the stronger cells. Although low level wind
fields in the 0-1 KM range are not overly impressive, given the
extreme instability, any deviant storm motion, with a more
southern track, would likely enhance SRH/tornado threat. In
addition, winds are little more backed/stronger across far
northeast Oklahoma and northwest Arkansas near warm front, where a
tornado or two will also be possible. Storms will likely become
more linear with time with multiple strong to severe thunderstorm
clusters pushing into southeast Oklahoma and northeast Arkansas
this evening, transitioning towards a damaging wind threat.

Significantly cooler weather expected behind front Tuesday into
Wednesday as surface high pressure builds over the region. Models
remain in good agreement with stronger upper shortwave moving out
of the northern Rockies and into the central Plains on Thursday.
Shower/thunderstorm chances will begin to ramp up Thursday
afternoon into Thursday night with widespread rain expected with
FROPA. NBM guidance looks good for the remainder of the extended
periods.

&&

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

AVIATION.....10

Hazardous weather outlook, May 4, 5:22 PM CDT, 1 hour 29 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
522 PM CDT Mon May 4 2020

ARZ001-002-010-011-019-020-029-OKZ049-053>076-051000-
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-
522 PM CDT Mon May 4 2020

...SIGNIFICANT SEVERE STORM POTENTIAL THROUGH THIS EVENING...VERY
LARGE HAIL...DAMAGING WINDS AND ONE OR TWO STRONG TORNADOES...

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

.DAY ONE...Tonight.

TORNADO.
	RISK...Elevated.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...Ongoing.

SEVERE THUNDERSTORM.
	RISK...Critical.
	AREA...Mainly Southeast of Interstate 44.
	ONSET...Ongoing.

FLASH FLOOD.
	RISK...Limited.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...Ongoing.

HEAVY RAIN.
	RISK...Limited.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...Ongoing.

DISCUSSION...
Scattered strong to severe thunderstorms have developed late this
afternoon along and just ahead of a strong cold front that is
nearing the Interstate 44 corridor. A few tornadoes, with one or
two strong tornadoes, are possible into the early evening hours.
Very large hail to baseball size and winds to 70 miles an hour
will also be possible with the strongest storms. Locally heavy
rainfall may also result in some localized flooding issues.

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

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
TUESDAY...High Wind Potential.
WEDNESDAY...No Hazards.
THURSDAY...Thunderstorm Potential...Heavy Rain Potential.
FRIDAY...Thunderstorm Potential.
SATURDAY and SUNDAY...No Hazards.

EXTENDED DISCUSSION...
After a dry Tuesday and Wednesday, thunderstorm chances along with
a severe weather threat return for Thursday into early Friday.

weather.gov/tulsa contains additional information.

In the hours before

Local storm report, May 4, 6:19 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
619 PM CDT MON MAY 4 2020

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

0615 PM     TSTM WND DMG     PRYOR                   36.31N 95.32W
05/04/2020                   MAYES              OK   EMERGENCY MNGR

            ROOF DAMAGE AT PRYOR MOVIE THEATRE

&&

MAT

Local storm report, May 4, 6:33 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
633 PM CDT MON MAY 4 2020

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

0629 PM     HAIL             5 SSW LIBERTY           35.79N 96.01W
05/04/2020  E0.75 INCH       OKMULGEE           OK   TRAINED SPOTTER

&&

MAT

Special weather statement, May 4, 6:33 PM CDT, 18 minutes before

Special Weather Statement
National Weather Service Tulsa OK
633 PM CDT Mon May 4 2020

OKZ058-050000-
Ottawa OK-
633 PM CDT Mon May 4 2020

...SIGNIFICANT WEATHER ADVISORY FOR OTTAWA COUNTY UNTIL 700 PM CDT...

At 633 PM CDT, a strong thunderstorm was located near Miami, moving
east at 40 mph.

Penny size hail and wind gusts of 50 to 55 mph will be possible with
this storm.

Locations in or near the path include...
Miami...                          Fairland...
Quapaw...                         Wyandotte...
Ottawa...                         Peoria...
Twin Bridges State Park...

This includes Interstate 44 between mile markers 300 and 324.

A Tornado Watch remains in effect until 1000 PM CDT for northeastern
Oklahoma.

LAT...LON 3700 9462 3677 9462 3674 9490 3691 9495
      3699 9464
TIME...MOT...LOC 2333Z 256DEG 34KT 3685 9484

Local storm report, May 4, 6:36 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
636 PM CDT MON MAY 4 2020

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

0606 PM     HAIL             WYANDOTTE               36.79N 94.72W
05/04/2020  E2.50 INCH       OTTAWA             OK   PUBLIC

&&

MAT

Local storm report, May 4, 6:42 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
642 PM CDT MON MAY 4 2020

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

0639 PM     HAIL             6 SE PRYOR              36.25N 95.24W
05/04/2020  E2.50 INCH       MAYES              OK   EMERGENCY MNGR

            REPORTED IN SPORTSMEN ACRES

&&

MAT

Special weather statement, May 4, 6:50 PM CDT, 1 minute before

Special Weather Statement
National Weather Service Tulsa OK
650 PM CDT Mon May 4 2020

OKZ065-066-050015-
Okmulgee OK-Okfuskee OK-
650 PM CDT Mon May 4 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN OKMULGEE AND CENTRAL
OKFUSKEE COUNTIES UNTIL 715 PM CDT...

At 650 PM CDT, a strong thunderstorm was located 3 miles northeast of
Castle, moving southeast at 35 mph.

Nickel size hail will be possible with this storm.

Locations in or near the path include...
Okemah...                         Boley...
Castle...                         Clearview...
Pharoah...                        Bryant...
Mason...

This includes Interstate 40 in Oklahoma between mile markers 219 and
234.

A Tornado Watch remains in effect until 1000 PM CDT for northeastern
and east central Oklahoma.

LAT...LON 3548 9648 3563 9638 3551 9599 3533 9609
TIME...MOT...LOC 2350Z 294DEG 32KT 3552 9635

The office that day

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

Issued	Product	Office	Counties	Lasted
May 4, 8:05 AM CDT	Special Weather Statement	TSA	Craig	40 min
May 4, 8:12 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes, Rogers	48 min
May 4, 8:19 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata	40 min
May 4, 8:22 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer	53 min
May 4, 8:41 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes, Ottawa	64 min
May 4, 8:51 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	39 min
May 4, 8:55 AM CDT	Severe Thunderstorm Warning	TSA	Delaware	65 min
May 4, 9:15 AM CDT	River Flood Warning	TSA	Ottawa	11 hr
May 4, 9:18 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Delaware	57 min
May 4, 9:26 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Ottawa	49 min
May 4, 9:32 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	43 min
May 4, 3:05 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Rogers, Washington	55 min
May 4, 3:52 PM CDT	Special Weather Statement	TSA	Washington	23 min
May 4, 3:53 PM CDT	Special Weather Statement	TSA	Nowata	37 min
May 4, 4:01 PM CDT	Special Weather Statement	TSA	Washington	29 min
May 4, 4:04 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata	41 min
May 4, 4:32 PM CDT	Special Weather Statement	TSA	Ottawa	28 min
May 4, 4:44 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Rogers, Washington	31 min
May 4, 4:53 PM CDT	Special Weather Statement	TSA	Craig	37 min
May 4, 4:57 PM CDT	Special Weather Statement	TSA	Tulsa	33 min
May 4, 5:01 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Muskogee, Okmulgee, Tulsa, Wagoner	44 min
May 4, 5:06 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	54 min
May 4, 5:10 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes, Rogers	50 min
May 4, 5:12 PM CDT	Severe Thunderstorm Warning	TSA	Ottawa	33 min
May 4, 5:16 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Rogers, Tulsa, Wagoner	44 min
May 4, 5:18 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	42 min
May 4, 5:31 PM CDT	Severe Thunderstorm Warning	TSA	Mayes, Rogers	29 min
May 4, 5:46 PM CDT	Severe Thunderstorm Warning	TSA	Ottawa	29 min
May 4, 5:58 PM CDT	Special Weather Statement	TSA	Okfuskee, Okmulgee, Wagoner	32 min
May 4, 5:58 PM CDT	Severe Thunderstorm Warning	TSA	Mayes	32 min
May 4, 6:04 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	41 min
May 4, 6:10 PM CDT	Severe Thunderstorm Warning	TSA	Rogers	35 min
May 4, 6:14 PM CDT	Severe Thunderstorm Warning	TSA	Ottawa	10 min
May 4, 6:27 PM CDT	Severe Thunderstorm Warning	TSA	Mayes	33 min
May 4, 6:33 PM CDT	Special Weather Statement	TSA	Ottawa	27 min
May 4, 6:37 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee	27 min
May 4, 6:39 PM CDT	Severe Thunderstorm Warning	TSA	Mayes, Rogers	36 min
May 4, 6:50 PM CDT	Special Weather Statement	TSA	Okfuskee	25 min
May 4, 6:51 PM CDT	Areal Flood Advisory	TSA	Delaware, Mayes	3 hr
May 4, 6:59 PM CDT	Severe Thunderstorm Warning	TSA	Mayes, Rogers, Wagoner	46 min
May 4, 9:57 AM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll, Madison, Washington	63 min
May 4, 10:59 AM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll, Madison, Washington	61 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.