Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 104, NWS Tulsa, OK

April 20, 2023Muskogee County, Okmulgee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 20, 2023, 12:20 AM CDT for Muskogee County, Okmulgee County, Oklahoma. It was in force for 26 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: Apr 20, 2023, 12:20 AM CDT (05:20 UTC)
Expired: Apr 20, 2023, 12:46 AM CDT
In force: 26 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Muskogee County, OK, Okmulgee County, OK

The radar

The Tulsa radar (KINX), 61 km from the middle of the area, began a volume at 05:24 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

Norman, OK (KOUN), launched 00:00Z, 5.3 hours before the alert went out and 163 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: 1620 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 1145 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 427 m²/s²
0-3 km storm-relative helicity: 523 m²/s²
Significant tornado parameter: 4.0
Supercell composite: 19.0

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 Apr 20, 12:09 AM CDT, 11 minutes earlier.

Area forecast discussion, Apr 20, 12:09 AM CDT, 11 minutes before

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Hazardous weather outlook, Apr 19, 5:15 PM CDT, 7 hours 5 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
515 PM CDT Wed Apr 19 2023

ARZ001-002-010-011-019-020-029-OKZ049-053>076-201015-
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-
515 PM CDT Wed Apr 19 2023

...SEVERE THUNDERSTORMS POSSIBLE THIS EVENING INTO THURSDAY ACROSS
   EASTERN OKLAHOMA AND WESTERN ARKANSAS...

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

.DAY ONE...Today and Tonight.
TORNADO.
	RISK...Limited.
	AREA...Eastern Oklahoma.
	ONSET...This Evening.

SEVERE THUNDERSTORM.
	RISK...Elevated.
	AREA...Eastern Oklahoma.
 ONSET...This Evening.

SIGNIFICANT WINDS.
	RISK...Elevated.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...Ongoing.

FIRE WEATHER DANGER.
	RISK...Elevated.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...Ongoing.

DISCUSSION...

Scattered severe thunderstorms have developed over central
Oklahoma, and will move northeast. These storms may move into
eastern Oklahoma early this evening, and pose a threat of severe
weather generally south of Highway 412 and west of Highway 75,
with less favorable conditions east of that region limiting the
eastward extent of the threat. The main hazard will be large hail
and damaging wind, however a low-end tornado threat will exist
early this evening.

A cold front will move into northeast Oklahoma just before
sunrise on Thursday, with more storms possible along the frontal
boundary.

Strong and gusty southerly winds will continue through tonight.
Elevated fire weather concerns will continue this evening across
a large portion of eastern Oklahoma and northwest Arkansas.

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

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.
THURSDAY...Severe Thunderstorm Potential...High Wind Potential...Heavy Rain Potential.
FRIDAY...No Hazards.
SATURDAY...Very High Fire Weather Potential.
SUNDAY...No Hazards.
MONDAY...Thunderstorm Potential...High Wind Potential.
TUESDAY...Thunderstorm Potential...High Wind Potential...Heavy Rain Potential.

EXTENDED DISCUSSION...
Thunderstorms could be ongoing along the front Thursday morning as
boundary moves into Northeast Oklahoma. The overall trend in storm
intensity should be weakening as the line moves through northeast
Oklahoma, but a few strong to severe storms will be possible, with
large hail and damaging winds the main threat, though a tornado
cannot be ruled out along the leading edge.

As the front moves into southeast Oklahoma and west central Arkansas
Thursday afternoon, new storm development is likely along and ahead
of the front. A highly unstable atmosphere along with strong shear
will support severe storms capable of large to very large hail and
tornadoes, especially with the early more discrete development.
Storms should push south of the region by late afternoon, with some
lingering showers and storms possible behind the front through
Friday as the main storm system is slow to exit the area.

Much cooler weather will follow the cold front for the weekend, with
a freeze possible across northern portions of the forecast area both
Saturday and Sunday morning. More shower and storm chances arrive on
Sunday and last into the middle of next week as a little more active
pattern sets up across the central CONUS.

weather.gov/tulsa contains additional information.

In the hours before

Special weather statement, Apr 19, 10:40 PM CDT, 1 hour 40 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1040 PM CDT Wed Apr 19 2023

OKZ054-200415-
Osage OK-
1040 PM CDT Wed Apr 19 2023

...A strong thunderstorm will impact portions of southeastern Osage
County through 1115 PM CDT...

At 1040 PM CDT, Doppler radar indicated a strong thunderstorm 6 miles
northwest of Hominy, moving northeast at 40 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down small tree limbs and blow
         around unsecured objects. Minor damage to outdoor objects
         is possible.

Locations in or near the path include...
Hominy...                         Barnsdall...
Wynona...                         Avant...
Okesa...                          Pershing...
Nelagoney...                      Tallant...
Wolco...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3655 9600 3649 9600 3634 9652 3636 9653
      3637 9652 3639 9652 3640 9654 3639 9655
      3651 9662 3674 9611
TIME...MOT...LOC 0340Z 245DEG 36KT 3646 9649

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

Special weather statement, Apr 19, 10:53 PM CDT, 1 hour 27 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1053 PM CDT Wed Apr 19 2023

OKZ056-057-200430-
Craig OK-Nowata OK-
1053 PM CDT Wed Apr 19 2023

...A strong shower will impact portions of northern Craig and
northeastern Nowata Counties through 1130 PM CDT...

At 1053 PM CDT, Doppler radar indicated a strong shower 10 miles
east of Lenapah, moving northeast at 35 mph.

HAZARD...Wind gusts of 50 to 55 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down small tree limbs and blow
         around unsecured objects.

Locations in or near the path include...
Welch...                          Hollow...
Pyramid Corners...                Centralia...
Centrailia...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3689 9500 3685 9500 3666 9539 3685 9562
      3700 9538 3700 9511
TIME...MOT...LOC 0353Z 244DEG 31KT 3684 9544

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

Special weather statement, Apr 19, 11:11 PM CDT, 1 hour 9 minutes before

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Local storm report, Apr 19, 11:25 PM CDT, 55 minutes before

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Local storm report, Apr 20, 12:17 AM CDT, 3 minutes before

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Local storm report, Apr 20, 12:18 AM CDT, 2 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
Apr 19, 7:54 PM CDT	Severe Thunderstorm Warning	TSA	Osage	39 min
Apr 19, 8:31 PM CDT	Special Weather Statement	TSA	Osage	14 min
Apr 19, 8:36 PM CDT	Special Weather Statement	TSA	Pawnee	24 min
Apr 19, 9:00 PM CDT	Special Weather Statement	TSA	Pawnee	45 min
Apr 19, 10:27 PM CDT	Severe Thunderstorm Warning Considerable damage threat	TSA	Creek, Okfuskee	63 min
Apr 19, 10:40 PM CDT	Special Weather Statement	TSA	Osage	35 min
Apr 19, 10:53 PM CDT	Special Weather Statement	TSA	Craig	37 min
Apr 19, 11:00 PM CDT	High Wind Warning	TSA	Craig, Nowata, Ottawa, Washington	44 min
Apr 19, 11:00 PM CDT	Wind Advisory	TSA	Craig, Nowata, Ottawa, Washington	8 hr
Apr 19, 11:18 PM CDT	Severe Thunderstorm Warning Considerable damage threat	TSA	Okfuskee, Okmulgee	42 min
Apr 19, 11:51 PM CDT	Severe Thunderstorm Warning Considerable damage threat	TSA	Okfuskee, Okmulgee	39 min
Apr 20, 12:24 AM CDT	Special Weather Statement	TSA	Rogers	36 min
Apr 20, 12:37 AM CDT	Special Weather Statement	TSA	Tulsa	23 min
Apr 20, 12:44 AM CDT	Special Weather Statement	TSA	Wagoner	31 min
Apr 20, 1:09 AM CDT	Special Weather Statement	TSA	Mayes, Wagoner	36 min
Apr 20, 6:39 AM CDT	Special Weather Statement	TSA	Creek	51 min
Apr 20, 7:34 AM CDT	Special Weather Statement	TSA	Creek	26 min
Apr 20, 12:39 PM CDT	Special Weather Statement	TSA	Pushmataha	36 min
Apr 20, 1:09 PM CDT	Special Weather Statement	TSA	Pushmataha	36 min
Apr 20, 1:26 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pushmataha	49 min
Apr 20, 1:56 PM CDT	Tornado Warning	TSA	Pushmataha	49 min
Apr 20, 2:12 PM CDT	Special Weather Statement	TSA	Choctaw	33 min
Apr 20, 2:19 PM CDT	Special Weather Statement	TSA	Sequoyah	26 min
Apr 20, 2:25 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Muskogee, Sequoyah	50 min
Apr 20, 2:44 PM CDT	Special Weather Statement	TSA	Pushmataha	46 min
Apr 20, 2:47 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Pushmataha	32 min
Apr 20, 3:26 PM CDT	Special Weather Statement	TSA	LeFlore	49 min
Apr 20, 3:43 PM CDT	Special Weather Statement	TSA	Sequoyah	47 min
Apr 20, 5:16 PM CDT	Special Weather Statement	TSA	Choctaw	29 min
Apr 20, 5:40 PM CDT	Special Weather Statement	TSA	Pushmataha	35 min
Apr 20, 1:31 PM CDT	Special Weather Statement	TSA	Benton	29 min
Apr 20, 1:43 PM CDT	Special Weather Statement	TSA	Madison	32 min
Apr 20, 1:56 PM CDT	Severe Thunderstorm Warning	TSA	Carroll	49 min
Apr 20, 2:12 PM CDT	Severe Thunderstorm Warning	TSA	Benton, Carroll	33 min
Apr 20, 3:06 PM CDT	Special Weather Statement	TSA	Franklin	24 min
Apr 20, 3:16 PM CDT	Special Weather Statement	TSA	Crawford	29 min
Apr 20, 3:18 PM CDT	Severe Thunderstorm Warning	TSA	Carroll	27 min
Apr 20, 3:29 PM CDT	Special Weather Statement	TSA	Franklin	31 min
Apr 20, 3:34 PM CDT	Severe Thunderstorm Warning	TSA	Crawford, Franklin, Madison, Washington	41 min
Apr 20, 3:52 PM CDT	Special Weather Statement	TSA	Carroll	23 min
Apr 20, 4:10 PM CDT	Severe Thunderstorm Warning	TSA	Carroll	24 min
Apr 20, 4:20 PM CDT	Special Weather Statement	TSA	Crawford, Madison	25 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2023 Every severe thunderstorm warning in 2023

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.