Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 245, NWS Tulsa, OK

May 11, 2017Osage County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 11, 2017, 4:22 PM CDT for Osage County, Oklahoma. It was in force for 23 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 11, 2017, 4:22 PM CDT (21:22 UTC)
Expired: May 11, 2017, 4:45 PM CDT
In force: 23 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), 93 km from the middle of the area, began a volume at 21:22 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.

What was reported inside it

Time	Report	Where	Remark
May 11, 4:25 PM CDT	HAIL 1.75	Pawhuska, OK
May 11, 4:35 PM CDT	HAIL 0.75	6 N Pawhuska, OK	OBSERVED NEAR THE INTERSECTION OF STATE HIGHWAY 99 AND HIGHWAY 60.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 3 minutes after it went out.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 11, 12:56 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.4 hours before the alert went out and 210 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: 1011 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

185 
WUUS54 KTSA 112122
SVRTSA
OKC113-112145-
/O.NEW.KTSA.SV.W.0245.170511T2122Z-170511T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
422 PM CDT THU MAY 11 2017

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Northeastern Osage County in northeastern Oklahoma...

* Until 445 PM CDT

* At 422 PM CDT, a severe thunderstorm was located 3 miles northeast
  of Pawhuska, moving northeast at 40 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...
  Pawhuska...                       Bigheart...
  Osage Hills State Park...         Hulah...
  Wah Sha She State Park...         

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3700 9600 3689 9600 3659 9628 3670 9645
      3700 9622
TIME...MOT...LOC 2122Z 217DEG 34KT 3672 9631 

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

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 11, 2:22 PM CDT, 2 hours earlier.

Area forecast discussion, May 11, 2:22 PM CDT, 2 hours before

Area Forecast Discussion
National Weather Service Tulsa OK
222 PM CDT Thu May 11 2017

.DISCUSSION...
Main forecast concern is the ongoing severe thunderstorm and heavy
rain potential across much of eastern Oklahoma and western
Arkansas.

Widespread thunderstorm development continues across eastern and
northern Oklahoma early this afternoon and will continue into at
least early to mid evening as the upper low in northwest Oklahoma
approaches and eventually moves overhead. The strongest storms
this afternoon and early evening should be north of Interstate 40,
where the greatest instabilities are located. This area will also
be beneath the track of the upper low and the coldest temperatures
aloft. Very large hail, potentially to baseball size, will be the
primary severe weather threat, in addition to damaging winds.
However, a very localized tornado threat will also continue near
and just north of Interstate 44 as a result of a lingering
boundary, a scenario supported by local model data.

In addition to the severe weather threat, locally heavy rainfall
from the strongest thunderstorms could cause flash flooding,
especially in parts of northeast Oklahoma that saw a lot of rain
last night and early this morning. The Flash Flood Watch will
continue through mid evening.

Additional thunderstorms may redevelop farther south into
southeast Oklahoma during the mid to late evening hours, which
would continue to have a severe potential, albeit lesser than the
storms to the north. Showers will continue into the day on
Friday, especially across far eastern Oklahoma and western
Arkansas, with a clearing from west to east through the day.

Cooler temperatures will follow the upper low and attendant cold
front for Friday and even into Saturday, before southerly winds
and above normal temperatures make a return on Sunday. Warm and
dry weather will persist into early next week, with low
thunderstorm chances returning toward the middle part of the week.
The next best chance of thunderstorms, including some severe
weather potential, should hold off until the Thursday-Friday time
frame.

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   60  75  51  79 /  80  20   0   0
FSM   62  75  53  80 /  80  50   0   0
MLC   60  73  52  79 /  60  20   0   0
BVO   58  74  46  79 /  80  10   0   0
FYV   58  71  46  76 /  80  50   0   0
BYV   58  70  49  76 /  80  50   0   0
MKO   59  73  51  79 /  70  30   0   0
MIO   59  73  49  78 /  80  20   0   0
F10   59  73  51  78 /  60  20   0   0
HHW   61  74  54  80 /  60  10   0   0

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...Flash Flood Watch until 10 PM CDT this evening for OKZ054>063-
     067>069.

AR...Flash Flood Watch until 10 PM CDT this evening for ARZ001-002-
     010-011.

&&

LONG TERM....22

Hazardous weather outlook, May 11, 1:19 PM CDT, 3 hours 3 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
119 PM CDT Thu May 11 2017

ARZ001-002-010-011-019-020-029-OKZ049-053>076-121015-
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-
119 PM CDT Thu May 11 2017

...Severe weather expected this afternoon with very large hail and
   damaging winds likely...

...Flash flood watch in effect for NE OK/NW AR through 10 PM...

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

.DAY ONE...This afternoon and tonight.

TORNADO.
     RISK...Limited to elevated.
     AREA...Northeastern Oklahoma.
     ONSET...early to mid afternoon.

SEVERE THUNDERSTORM.
	RISK...Critical.
	AREA...Eastern Oklahoma and Northwest Arkansas.
	ONSET...early to mid afternoon.

	AREA AT GREATEST RISK...Northeast Oklahoma and northwest
    Arkansas.

HEAVY RAIN.
	RISK...Elevated.
	AREA...Eastern Oklahoma and northwest Arkansas.
	ONSET...This afternoon through the evening hours.

FLASH FLOOD.
	RISK...Limited.
	AREA...Northeast Oklahoma and northwest Arkansas.
	ONSET...This Afternoon through the evening hours.

DISCUSSION...Strong to severe thunderstorms are expected to rapidly
develop this afternoon across much of eastern Oklahoma and northwest
Arkansas. Very large hail to the size of baseballs and damaging
winds will be possible, especially with any supercells that
initially develop. Although low level winds are expected to remain
light, a limited to elevated tornado threat will exists over
portions of northeast Oklahoma near a stationary boundary located
just north of I-44.  Given the very unstable air-mass in place, any
deviant storm motions could locally enhance low level storm rotation.

Additionally...soils remain saturated across much of northeast
Oklahoma from recent rainfall. Locally heavy rain will be likely in
the stronger storms this afternoon into the evening hours. 1 to 3
inches of rainfall is expected and locally 4 inches possible. Any
additional rainfall will likely lead to excessive runoff.

The risk for severe weather will diminish by mid to late evening as
the front begins to shift east. A few thunderstorms could persist
into the overnight hours...especially across northeast Oklahoma and
northwest Arkansas before the upper low clears the area.

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

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
FRIDAY Through MONDAY...No Hazards.
TUESDAY and WEDNESDAY...Thunderstorm Potential.

EXTENDED DISCUSSION... Cooler and settled conditions will settle
across the area from west to east on Friday. Warmer temperatures are
expected through the weekend and will continue into at least the
first part of next week. Thunderstorm chances will be on the
increase once again in the Tuesday and Wednesday as an upper system
to the northwest begins to impact the region.

weather.gov/tulsa Contains additional information.

In the hours before

Local storm report, May 11, 2:32 PM CDT, 1 hour 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
232 PM CDT THU MAY 11 2017

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

0230 PM     HAIL             OWASSO                  36.27N 95.85W
05/11/2017  E1.00 INCH       TULSA              OK   NWS EMPLOYEE

&&

JDS

Local storm report, May 11, 2:45 PM CDT, 1 hour 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
245 PM CDT THU MAY 11 2017

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

0205 PM     TORNADO          5 NE OWASSO             36.32N 95.79W
05/11/2017                   ROGERS             OK   TRAINED SPOTTER

            NUMEROUS PHOTOS OF FUNNELS OR TORNADOES. PHOTOS OF DAMAGE
            TO TREES...SOME BUILDINGS....AND FENCES. ALSO RADAR
            INDICATIONS OF A TORNADO TOUCHDOWN.

&&

KAH

Special weather statement, May 11, 2:58 PM CDT, 1 hour 24 minutes before

Special Weather Statement
National Weather Service Tulsa OK
258 PM CDT THU MAY 11 2017

OKZ075-076-112030-
Latimer OK-Le Flore OK-
258 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN LATIMER AND WEST CENTRAL
LE FLORE COUNTIES UNTIL 330 PM CDT...

At 258 PM CDT, a strong thunderstorm was located over Bengal, moving
northeast 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...
Talihina...                       Wister...
Red Oak...                        Fanshawe...
Talimena State Park...            Bengal...
Lake Wister State Park...         Summerfield...

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 900 PM CDT for
southeastern Oklahoma.

LAT...LON 3489 9521 3506 9501 3506 9493 3512 9493
      3514 9491 3494 9464 3470 9502
TIME...MOT...LOC 1958Z 219DEG 33KT 3482 9504

Special weather statement, May 11, 3:20 PM CDT, 1 hour 2 minutes before

Special Weather Statement
National Weather Service Tulsa OK
320 PM CDT THU MAY 11 2017

OKZ076-112045-
Le Flore OK-
320 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN LE FLORE COUNTY UNTIL
345 PM CDT...

At 320 PM CDT, a strong thunderstorm was located 3 miles northwest of
Lake Wister State Park, moving northeast 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...
Poteau...                         Pocola...
Spiro...                          Panama...
Wister...                         Howe...
Cameron...                        Lake Wister State Park...
Shady Point...                    Rock Island...
Scullyville...

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 900 PM CDT for
southeastern Oklahoma.

LAT...LON 3500 9445 3485 9481 3500 9493 3531 9459
      3523 9444
TIME...MOT...LOC 2020Z 237DEG 36KT 3497 9480

Local storm report, May 11, 4:09 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
409 PM CDT THU MAY 11 2017

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

0404 PM     HAIL             3 N OILTON              36.13N 96.58W
05/11/2017  E0.88 INCH       CREEK              OK   TRAINED SPOTTER

&&

JDS

Local storm report, May 11, 4:20 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
420 PM CDT THU MAY 11 2017

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

0413 PM     HAIL             1 S HALLETT             36.22N 96.57W
05/11/2017  E0.88 INCH       PAWNEE             OK   BROADCAST MEDIA

            REPORTED AT HIGHWAY 99 AND THE CIMARRON TURNPIKE/HIGHWAY
            412.

0415 PM     HAIL             3 N OILTON              36.13N 96.58W
05/11/2017  E0.75 INCH       CREEK              OK   TRAINED SPOTTER

&&

KAH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 9:31 PM CDT	Special Weather Statement	TSA	Creek, Pawnee	44 min
May 10, 9:41 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Pawnee	34 min
May 10, 10:07 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa	38 min
May 10, 10:33 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Rogers, Tulsa, Washington	42 min
May 10, 10:43 PM CDT	Special Weather Statement	TSA	Tulsa, Wagoner	47 min
May 10, 11:06 PM CDT	Special Weather Statement	TSA	Mayes, Nowata, Rogers, Washington	39 min
May 10, 11:11 PM CDT	Special Weather Statement	TSA	Wagoner	34 min
May 10, 11:15 PM CDT	Special Weather Statement	TSA	Craig	30 min
May 10, 11:36 PM CDT	Special Weather Statement	TSA	Craig, Ottawa	39 min
May 10, 11:38 PM CDT	Special Weather Statement	TSA	Delaware, Mayes	52 min
May 10, 11:55 PM CDT	Severe Thunderstorm Warning	TSA	Delaware	35 min
May 10, 11:59 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	46 min
May 11, 6:28 AM CDT	Special Weather Statement	TSA	Tulsa	32 min
May 11, 6:50 AM CDT	Special Weather Statement	TSA	Tulsa	25 min
May 11, 7:18 AM CDT	Special Weather Statement	TSA	Washington	27 min
May 11, 7:33 AM CDT	Special Weather Statement	TSA	Rogers	27 min
May 11, 7:42 AM CDT	Special Weather Statement	TSA	Washington	33 min
May 11, 7:53 AM CDT	Special Weather Statement	TSA	Mayes	37 min
May 11, 8:19 AM CDT	Special Weather Statement	TSA	Delaware	26 min
May 11, 8:27 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Ottawa	48 min
May 11, 10:53 AM CDT	Flash Flood Watch	TSA	Adair, Cherokee, Craig, Delaware, Mayes, Nowata and 6 more	11 hr
May 11, 1:02 PM CDT	Special Weather Statement	TSA	Muskogee	28 min
May 11, 1:10 PM CDT	Special Weather Statement	TSA	Okfuskee	35 min
May 11, 1:17 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee	28 min
May 11, 1:34 PM CDT	Special Weather Statement	TSA	Tulsa	26 min
May 11, 1:43 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Rogers, Tulsa, Wagoner	47 min
May 11, 1:52 PM CDT	Areal Flood Advisory	TSA	Creek, Muskogee, Okmulgee, Osage, Rogers, Tulsa and 1 more	113 min
May 11, 1:53 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa	52 min
May 11, 2:02 PM CDT	Tornado Warning	TSA	Rogers	28 min
May 11, 2:11 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	34 min
May 11, 2:19 PM CDT	Special Weather Statement	TSA	Craig	26 min
May 11, 2:24 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa	36 min
May 11, 2:28 PM CDT	River Flood Warning	TSA	Ottawa	3 days
May 11, 2:29 PM CDT	Tornado Warning	TSA	Rogers	15 min
May 11, 2:31 PM CDT	Special Weather Statement	TSA	Latimer	29 min
May 11, 2:33 PM CDT	Areal Flood Advisory	TSA	Craig, Delaware, Mayes, Nowata, Ottawa, Rogers and 1 more	57 min
May 11, 2:41 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata	34 min
May 11, 2:52 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Ottawa	38 min
May 11, 2:57 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Washington	13 min
May 11, 2:58 PM CDT	Special Weather Statement	TSA	LeFlore	32 min
May 11, 3:17 PM CDT	Flash Flood Warning	TSA	Craig, Delaware, Nowata, Ottawa, Rogers	4 hr
May 11, 3:20 PM CDT	Special Weather Statement	TSA	LeFlore	25 min
May 11, 3:22 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	53 min
May 11, 3:38 PM CDT	Severe Thunderstorm Warning	TSA	Osage	52 min
May 11, 3:50 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee	40 min
May 11, 4:16 PM CDT	Severe Thunderstorm Warning	TSA	Osage	44 min
May 11, 4:25 PM CDT	Areal Flood Advisory	TSA	Osage, Pawnee	3 hr
May 11, 4:25 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa	50 min
May 11, 4:31 PM CDT	Tornado Warning	TSA	Osage	29 min
May 11, 4:33 PM CDT	Tornado Warning	TSA	Osage	27 min
May 11, 4:46 PM CDT	Tornado Warning	TSA	Osage, Washington	29 min
May 11, 4:52 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Washington	38 min
May 11, 5:05 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Mayes, Okmulgee, Osage, Rogers, Tulsa and 2 more	40 min
May 11, 5:06 PM CDT	Tornado Warning	TSA	Nowata, Rogers, Washington	24 min
May 11, 5:24 PM CDT	Tornado Warning	TSA	Nowata, Rogers, Washington	18 min
May 11, 5:42 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes, Rogers, Tulsa	48 min
May 11, 5:52 PM CDT	Tornado Warning	TSA	Rogers	23 min
May 11, 6:04 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Wagoner	41 min
May 11, 6:10 PM CDT	Tornado Warning	TSA	Mayes, Rogers	16 min
May 11, 6:24 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Wagoner	51 min
May 11, 6:30 PM CDT	Special Weather Statement	TSA	Mayes	45 min
May 11, 6:32 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes	28 min
May 11, 6:53 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes, Ottawa	52 min
May 11, 6:55 PM CDT	Special Weather Statement	TSA	Muskogee	35 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.