Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 192, NWS Tulsa, OK

May 15, 2020LeFlore County, Sequoyah County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 15, 2020, 12:07 PM CDT for LeFlore County, Sequoyah County, Oklahoma. It was in force for 38 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: May 15, 2020, 12:07 PM CDT (17:07 UTC)
Expired: May 15, 2020, 12:45 PM CDT
In force: 38 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties LeFlore County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 38 km from the middle of the area, began a volume at 17:09 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 nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 5.1 hours before the alert went out and 192 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: 1018 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -234 m²/s²
0-3 km storm-relative helicity: -297 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

241 
WUUS54 KTSA 151707
SVRTSA
OKC079-135-151745-
/O.NEW.KTSA.SV.W.0192.200515T1707Z-200515T1745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
1207 PM CDT Fri May 15 2020

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Southeastern Sequoyah County in east central Oklahoma...
  Northeastern Le Flore County in southeastern Oklahoma...

* Until 1245 PM CDT.

* At 1207 PM CDT, a severe thunderstorm was located 3 miles southwest
  of Sallisaw, moving east at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations in or near the path include...
  Sallisaw...                       Muldrow...
  Roland...                         Gans...
  Mc Key...                         Cottonwood...
  Braden...                         

This includes Interstate 40 in Oklahoma between mile markers 301 and
327.
 
LAT...LON 3523 9449 3533 9482 3534 9483 3536 9483
      3537 9484 3535 9490 3537 9490 3538 9489
      3539 9490 3552 9488 3550 9446
TIME...MOT...LOC 1707Z 279DEG 16KT 3541 9483 

HAIL...1.00IN
WIND...60MPH
 
$$

Lacy

2 follow-up statements

131 
WWUS54 KTSA 151734
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
1234 PM CDT Fri May 15 2020

OKC079-135-151745-
/O.CON.KTSA.SV.W.0192.000000T0000Z-200515T1745Z/
Sequoyah OK-Le Flore OK-
1234 PM CDT Fri May 15 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT
FOR SOUTHEASTERN SEQUOYAH AND NORTHEASTERN LE FLORE COUNTIES...

At 1233 PM CDT, a severe thunderstorm was located over Gans, moving
east at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations in or near the path include...
Sallisaw...                       Muldrow...
Roland...                         Gans...
Braden...                         Cottonwood...

A weakening trend has been observed with the storm. If this trend 
continues, the warning will be allowed to expire on time at 1245 PM.

This includes Interstate 40 in Oklahoma between mile markers 308 and
327.
 
LAT...LON 3535 9483 3551 9475 3550 9446 3523 9449
      3533 9482 3534 9483
TIME...MOT...LOC 1733Z 279DEG 16KT 3539 9469 

HAIL...1.00IN
WIND...60MPH
 
$$

Lacy

560 
WWUS54 KTSA 151741
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
1241 PM CDT Fri May 15 2020

OKC079-135-151751-
/O.EXP.KTSA.SV.W.0192.000000T0000Z-200515T1745Z/
Sequoyah OK-Le Flore OK-
1241 PM CDT Fri May 15 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SEQUOYAH AND
NORTHEASTERN LE FLORE COUNTIES WILL EXPIRE AT 1245 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire.

LAT...LON 3535 9483 3551 9475 3550 9446 3523 9449
      3533 9482 3534 9483
TIME...MOT...LOC 1741Z 279DEG 16KT 3538 9465 

$$

Lacy

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 15, 11:10 AM CDT, 57 minutes earlier.

Area forecast discussion, May 15, 11:10 AM CDT, 57 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
1110 AM CDT Fri May 15 2020

...UPDATE...

.DISCUSSION...
Two primary boundaries being followed this morning. Initial
outflow from earlier morning storms has pushed near the Interstate
40 corridor in eastern OK with strong to severe storms continuing
to develop in vicinity. This boundary has slowed southward
progress over the past few hours and conditions will become
increasingly unstable to its east and south. Further north the
more substantial cold front has pushed to near Interstate 44 and
marks the northward extent of any stronger storm potential.
Between the two boundaries will remain a heavy rain potential and
more so across eastern OK nearer the generation zone of higher
rain rate cores. Through the afternoon the northern boundary will
continue southward and likely overtake the more southern boundary
with a continue chance of strong to severe storms. The corridor of
most unstable air is likely to remain just west and south of the
forecast area. Assuming the aforementioned boundary does continue
a southward advance the late afternoon and evening svr storms will
confined to far southern portions of the fcst area and points
further south and west. Updated forecast will adjust precip
expected precip trends with north to south advance. Also temps
lowered across northern areas and further cooling may be needed
in later updates.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   76  65  79  62 /  90  60  70  50
FSM   79  65  79  65 /  90  60  80  80
MLC   79  64  77  63 /  90  70  80  60
BVO   73  64  79  60 /  90  60  80  50
FYV   73  63  77  62 /  90  60  80  80
BYV   72  63  78  62 /  80  60  80  80
MKO   75  64  77  63 /  90  60  80  60
MIO   73  64  79  62 /  90  60  80  60
F10   77  64  77  63 /  90  60  70  50
HHW   81  66  77  65 /  90  70  80  60

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...Flash Flood Watch until 4 PM CDT this afternoon for OKZ055>058-
     060>063-066>072-074.

AR...Flash Flood Watch until 4 PM CDT this afternoon for ARZ001.

&&

SHORT TERM...07

Hazardous weather outlook, May 15, 7:58 AM CDT, 4 hours 9 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
758 AM CDT Fri May 15 2020

ARZ001-002-010-011-019-020-029-OKZ049-053>076-161015-
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-
758 AM CDT Fri May 15 2020

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

.DAY ONE...Today and Tonight.

SEVERE THUNDERSTORM.
	RISK...Elevated.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...Ongoing...spreading southward through the day.

FLASH FLOOD.
	RISK...Limited.
	AREA...Primarily northeast Oklahoma and far northwest Arkansas.
	ONSET...Ongoing.

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

DISCUSSION...
Widespread showers and storms are ongoing across northeast Oklahoma
with more scattered showers and storms across northwest Arkansas.
The heaviest rainfall has occurred near the Oklahoma Kansas border
and this area will remain prone to additional flooding through the
morning. Storms will continue to develop and spread into northeast
Oklahoma this morning, with additional development further south
across southeast Oklahoma later today into the evening.  Areas
of strong outflow winds and isolated large hail potential will
be the focus for severe weather potential through the day.
The risk of severe weather and flooding is likely to diminish
by mid evening with storms more focused further south and west
across southern Oklahoma and north Texas.

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

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.
SATURDAY...Thunderstorm Potential...Heavy Rain Potential.
SUNDAY...Thunderstorm Potential.
MONDAY THROUGH THURSDAY...No Hazards.

EXTENDED DISCUSSION...
Thunderstorm chances will continue into the day Saturday as an
upper low lifts into northeast Texas. A few of these storms could
briefly become severe with locally heavy rainfall. Lingering
showers and thunderstorms could continue Sunday across far southeast
Oklahoma and northwest Arkansas before shifting southeast of the
area by mid to late afternoon.

weather.gov/tulsa contains additional information.

In the hours before

Local storm report, May 15, 11:18 AM CDT, 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1118 AM CDT FRI MAY 15 2020

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

1110 AM     FLASH FLOOD      BROKEN ARROW            36.05N 95.79W
05/15/2020                   TULSA              OK   PUBLIC

            SOCIAL MEDIA REPORT OF ROADWAY FLOODING AT ONETA ROAD AND
            55TH ST.

&&

JDS

Local storm report, May 15, 11:30 AM CDT, 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1130 AM CDT FRI MAY 15 2020

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

1025 AM     FLASH FLOOD      MUSKOGEE                35.75N 95.37W
05/15/2020                   MUSKOGEE           OK   STORM CHASER

            VIDEO FROM STORM CHASER OF FLOODING IN NEIGHBORHOOD ON
            SOUTH SIDE OF MUSKOGEE.

&&

JDS

Local storm report, May 15, 11:33 AM CDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1133 AM CDT FRI MAY 15 2020

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

1130 AM     FLASH FLOOD      CHECOTAH                35.47N 95.52W
05/15/2020                   MCINTOSH           OK   STORM CHASER

            STORM CHASER VIDEO OF FLOODING IN AND AROUND CHECOTAH.

&&

JDS

Local storm report, May 15, 11:40 AM CDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1140 AM CDT FRI MAY 15 2020

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

1139 AM     FLASH FLOOD      3 W HULBERT             35.93N 95.19W
05/15/2020                   CHEROKEE           OK   DEPT OF HIGHWAYS

            REPORT THAT SH-80 IS CLOSED WEST OF HULBERT DUE TO
            FLOODING.

&&

JDS

Local storm report, May 15, 11:47 AM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
1147 AM CDT FRI MAY 15 2020

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

1128 AM     FLASH FLOOD      2 NE ONETA              36.04N 95.68W
05/15/2020                   WAGONER            OK   PUBLIC

            LOW WATER CROSSING OVERFLOWING ROADWAY.

&&

JDS

Special weather statement, May 15, 12:02 PM CDT, 5 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1202 PM CDT Fri May 15 2020

OKZ071-073-151730-
Pittsburg OK-McIntosh OK-
1202 PM CDT Fri May 15 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN MCINTOSH AND NORTHERN
PITTSBURG COUNTIES UNTIL 1230 PM CDT...

At 1202 PM CDT, a strong thunderstorm was located over Hanna, moving
east at 50 mph.

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

Locations in or near the path include...
Eufaula...                        Canadian...
Indianola...                      Hanna...
Arrowhead State Park...           Raiford...
Vivian...                         Vernon...

LAT...LON 3530 9598 3538 9546 3512 9546 3515 9598
TIME...MOT...LOC 1702Z 264DEG 41KT 3522 9589

Lacy

The office that day

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

Issued	Product	Office	Counties	Lasted
May 15, 3:16 AM CDT	Special Weather Statement	TSA	Ottawa	59 min
May 15, 3:23 AM CDT	Special Weather Statement	TSA	Nowata	67 min
May 15, 3:59 AM CDT	Special Weather Statement	TSA	Craig, Nowata, Ottawa	46 min
May 15, 4:49 AM CDT	Special Weather Statement	TSA	Craig, Delaware, Nowata, Ottawa, Washington	41 min
May 15, 5:03 AM CDT	Special Weather Statement	TSA	Adair, Cherokee, Mayes, Rogers	42 min
May 15, 5:34 AM CDT	Special Weather Statement	TSA	Nowata	26 min
May 15, 5:41 AM CDT	Areal Flood Advisory	TSA	Craig, Nowata, Washington	4 hr
May 15, 5:44 AM CDT	Special Weather Statement	TSA	Adair, Cherokee, Mayes	46 min
May 15, 6:08 AM CDT	Special Weather Statement	TSA	Tulsa	37 min
May 15, 6:16 AM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Wagoner	44 min
May 15, 7:00 AM CDT	Special Weather Statement	TSA	Tulsa	30 min
May 15, 7:02 AM CDT	Special Weather Statement	TSA	Wagoner	28 min
May 15, 7:04 AM CDT	Areal Flood Advisory	TSA	Rogers, Tulsa, Wagoner	3 hr
May 15, 7:08 AM CDT	Special Weather Statement	TSA	Nowata, Washington	37 min
May 15, 8:11 AM CDT	Special Weather Statement	TSA	Wagoner	34 min
May 15, 8:23 AM CDT	Special Weather Statement	TSA	Osage	52 min
May 15, 8:53 AM CDT	Special Weather Statement	TSA	Muskogee	37 min
May 15, 9:05 AM CDT	Areal Flood Advisory	TSA	Cherokee, Muskogee, Wagoner	3 hr
May 15, 9:10 AM CDT	Special Weather Statement	TSA	Craig	35 min
May 15, 9:11 AM CDT	Special Weather Statement	TSA	Muskogee	34 min
May 15, 9:16 AM CDT	Flash Flood Warning	TSA	Craig, Nowata	4 hr
May 15, 9:24 AM CDT	Areal Flood Advisory	TSA	Rogers, Wagoner	3 hr
May 15, 9:27 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Muskogee, Sequoyah	48 min
May 15, 9:37 AM CDT	Flash Flood Warning	TSA	Muskogee, Wagoner	3 hr
May 15, 9:40 AM CDT	Special Weather Statement	TSA	Wagoner	35 min
May 15, 9:55 AM CDT	Areal Flood Advisory	TSA	Washington	3 hr
May 15, 10:04 AM CDT	Special Weather Statement	TSA	McIntosh	26 min
May 15, 10:10 AM CDT	Special Weather Statement	TSA	Muskogee	50 min
May 15, 10:13 AM CDT	Special Weather Statement	TSA	Tulsa	32 min
May 15, 10:26 AM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	49 min
May 15, 10:30 AM CDT	Areal Flood Advisory	TSA	McIntosh, Muskogee	3 hr
May 15, 10:32 AM CDT	Special Weather Statement	TSA	McIntosh	28 min
May 15, 10:34 AM CDT	Areal Flood Advisory	TSA	Tulsa	3 hr
May 15, 10:40 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, Muskogee, Sequoyah	50 min
May 15, 10:43 AM CDT	Special Weather Statement	TSA	Tulsa	32 min
May 15, 10:45 AM CDT	Special Weather Statement	TSA	Okmulgee	30 min
May 15, 10:51 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh	39 min
May 15, 11:02 AM CDT	Flash Flood Warning	TSA	McIntosh, Muskogee, Okmulgee	4 hr
May 15, 11:07 AM CDT	Areal Flood Advisory	TSA	Cherokee, Craig, Delaware, Mayes, Rogers, Wagoner	3 hr
May 15, 11:27 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, LeFlore, Sequoyah	48 min
May 15, 11:45 AM CDT	Areal Flood Advisory	TSA	Okfuskee	3 hr
May 15, 12:02 PM CDT	Special Weather Statement	TSA	McIntosh	28 min
May 15, 12:12 PM CDT	Special Weather Statement	TSA	Haskell	33 min
May 15, 12:23 PM CDT	Flash Flood Warning	TSA	Haskell, Sequoyah	3 hr
May 15, 12:36 PM CDT	Special Weather Statement	TSA	Haskell, Pittsburg	39 min
May 15, 12:44 PM CDT	Special Weather Statement	TSA	Sequoyah	31 min
May 15, 12:52 PM CDT	Areal Flood Warning	TSA	Mayes, Muskogee, Rogers, Wagoner	9 hr
May 15, 1:01 PM CDT	Areal Flood Warning	TSA	Craig, Nowata	9 hr
May 15, 1:05 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	40 min
May 15, 1:12 PM CDT	Flash Flood Warning	TSA	Haskell, LeFlore, Sequoyah	4 hr
May 15, 1:19 PM CDT	Special Weather Statement	TSA	Latimer	26 min
May 15, 1:25 PM CDT	Special Weather Statement	TSA	Haskell	35 min
May 15, 1:40 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	50 min
May 15, 1:43 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, LeFlore	47 min
May 15, 1:52 PM CDT	Flash Flood Warning	TSA	Latimer, LeFlore, Pittsburg	4 hr
May 15, 2:11 PM CDT	River Flood Warning	TSA	Nowata	62 hr
May 15, 2:19 PM CDT	Special Weather Statement	TSA	LeFlore	26 min
May 15, 2:22 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	53 min
May 15, 2:49 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	41 min
May 15, 2:55 PM CDT	Areal Flood Warning	TSA	McIntosh, Muskogee, Okmulgee	9 hr
May 15, 3:08 PM CDT	River Flood Advisory	TSA	Cherokee	6 hr
May 15, 3:11 PM CDT	Areal Flood Warning	TSA	Haskell, Sequoyah	9 hr
May 15, 3:30 PM CDT	Areal Flood Advisory	TSA	LeFlore, Pushmataha	2 hr
May 15, 4:40 PM CDT	Areal Flood Advisory	TSA	Choctaw	2 hr
May 15, 5:12 PM CDT	Areal Flood Warning	TSA	Haskell, LeFlore, Sequoyah	9 hr
May 15, 5:40 PM CDT	Areal Flood Warning	TSA	Latimer, LeFlore, Pittsburg	9 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.