Alert archive / Oklahoma / Special Weather Statements in 2017

Special Weather Statement, NWS Tulsa, OK

May 11, 2017Cherokee County, Oklahoma

NWS Tulsa, OK issued this special weather statement at May 11, 2017, 8:02 PM CDT for Cherokee County, Oklahoma. It was in force for 28 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 11, 2017, 8:02 PM CDT (01:02 UTC)
Expired: May 11, 2017, 8:30 PM CDT
In force: 28 min
Issued by: NWS Tulsa, OK

County Cherokee County, OK

The radar

The Tulsa radar (KINX), 63 km from the middle of the area, began a volume at 01:04 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

Springfield, MO (KSGF), launched 00:00Z, 1.0 hours before the alert went out and 154 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: 586 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 762 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: -107 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: -0.4
Supercell composite: -2.3

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at May 11, 6:35 PM CDT, 1 hour 27 minutes earlier.

Area forecast discussion, May 11, 6:35 PM CDT, 1 hour 27 minutes before

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

.AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
Convective line has pushed past TUL/BVO/RVS and these sites are
likely done with severe storms for the evening. There may be
isolated storms later this evening as the upper low comes east.
For the NW AR TAFs, storms will arrive between 01z-03z, possibly
with some wind. It is not guaranteed that KMLC or KFSM will see
storms at the terminal, but there will be tempo groups based on
latest short term guidance. Low clouds are likely to develop
overnight as upper low approaches.

&&

.PREV DISCUSSION... /Issued 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....30
AVIATION...06

CORFIDI

Hazardous weather outlook, May 11, 4:52 PM CDT, 3 hours 10 minutes before

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

ARZ001-002-010-011-019-020-029-OKZ049-053>076-121045-
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-
452 PM CDT Thu May 11 2017

...Severe thunderstorms ongoing this afternoon with 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...Elevated.
AREA...Northeast OK mainly north of a line from Okmulgee to Tahlequah.
ONSET...Ongoing.

SEVERE THUNDERSTORM.
RISK...Critical.
AREA...Eastern Oklahoma and Western Arkansas.
ONSET...Ongoing.

AREA AT GREATEST RISK...Eastern Oklahoma mainly north of
Interstate 40. Isolated severe storms are possible across SE OK
this evening.

FLASH FLOOD.
RISK...Limited.
AREA...Northeast Oklahoma and northwest Arkansas.
ONSET...Ongoing.

HEAVY RAIN.
RISK...Elevated.
AREA...Northeast Oklahoma and northwest Arkansas.
ONSET...Ongoing.

DISCUSSION...
Severe thunderstorms are ongoing this afternoon across northeast
Oklahoma. The leading edge of a line of storms was moving across
Osage, Pawnee and Creek Counties and will affect portions of
Bartlesville and the Tulsa metro area between 5 and 6 PM. Storms
will affect far northeast Oklahoma including Vinita, Pryor and
Muskogee after 7 PM. Strong wind fields and moderate instability
will support isolated tornadoes with this activity in addition to
hail and damaging winds. In addition to severe weather, flash
flooding is likely in portions of northeast Oklahoma.

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

.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.

EMERGENCY MANAGEMENT PLANNING STATEMENT...
Severe warnings will likely continue through the early evening
hours for northeast Oklahoma. Listen for the latest information
for your area and take appropriate severe weather preparedness
actions.

weather.gov/tulsa Contains additional information.

CORFIDI

In the hours before

Special weather statement, May 11, 7:14 PM CDT, 48 minutes before

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

OKZ066-071-120045-
Okmulgee OK-McIntosh OK-
714 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN MCINTOSH AND SOUTH
CENTRAL OKMULGEE COUNTIES UNTIL 745 PM CDT...

At 714 PM CDT, a strong thunderstorm was located 5 miles southeast of
Dewar, moving east at 20 mph.

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

Locations in or near the path include...
Henryetta...                      Dewar...
Hoffman...                        Stidham...
Lake Eufaula State Park...        Hitchita...
Pierce...                         Onapa...

This includes Interstate 40 in Oklahoma between mile markers 239 and
261.

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 900 PM CDT for
southeastern and northeastern Oklahoma.

LAT...LON 3547 9597 3555 9569 3555 9559 3532 9553
      3529 9593
TIME...MOT...LOC 0014Z 257DEG 18KT 3540 9587

Local storm report, May 11, 7:17 PM CDT, 45 minutes before

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

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

0700 PM     HAIL             KETCHUM                 36.52N 95.02W
05/11/2017  E1.00 INCH       CRAIG              OK   BROADCAST MEDIA

&&

JDS

Local storm report, May 11, 7:26 PM CDT, 36 minutes before

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

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

0719 PM     HAIL             LOCUST GROVE            36.20N 95.17W
05/11/2017  E0.75 INCH       MAYES              OK   EMERGENCY MNGR

            HIGHWAY 82 AND CHEROKEE TURNPIKE

&&

JDS

Special weather statement, May 11, 7:27 PM CDT, 35 minutes before

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

OKZ070-071-120100-
Muskogee OK-McIntosh OK-
727 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN MCINTOSH AND CENTRAL
MUSKOGEE COUNTIES UNTIL 800 PM CDT...

At 727 PM CDT, a strong thunderstorm was located near Council Hill,
moving east at 20 mph.

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

Locations in or near the path include...
Muskogee...                       Checotah...
Warner...                         Oktaha...
Boynton...                        Council Hill...
Rentiesville...                   Keefeton...
Wainwright...                     Summit...

This includes Interstate 40 in Oklahoma between mile markers 274 and
276.

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 900 PM CDT for
southeastern and east central Oklahoma.

LAT...LON 3567 9571 3573 9533 3546 9531 3549 9571
TIME...MOT...LOC 0027Z 266DEG 19KT 3559 9563

Special weather statement, May 11, 7:41 PM CDT, 21 minutes before

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

OKZ073-120115-
Pittsburg OK-
741 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN PITTSBURG COUNTY
UNTIL 815 PM CDT...

At 740 PM CDT, a strong thunderstorm was located 4 miles northeast of
Calvin, moving east at 15 mph.

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

Locations in or near the path include...
Scipio...                         Arpelar...

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 900 PM CDT for
southeastern Oklahoma.

LAT...LON 3505 9609 3506 9607 3509 9606 3512 9603
      3512 9601 3515 9601 3515 9595 3514 9591
      3516 9588 3519 9587 3519 9586 3493 9589
      3490 9609
TIME...MOT...LOC 0040Z 249DEG 12KT 3500 9618

Special weather statement, May 11, 8:02 PM CDT, 0 minutes before

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

OKZ068-069-120130-
Adair OK-Cherokee OK-
802 PM CDT THU MAY 11 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN ADAIR AND CENTRAL
CHEROKEE COUNTIES UNTIL 830 PM CDT...

At 802 PM CDT, a strong thunderstorm was located 3 miles south of
Hulbert, moving east at 35 mph.

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

Locations in or near the path include...
Tahlequah...                      Hulbert...
Eldon...                          Proctor...

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 900 PM CDT for
northeastern and east central Oklahoma.

LAT...LON 3585 9467 3578 9513 3581 9513 3581 9518
      3595 9523 3611 9476
TIME...MOT...LOC 0102Z 253DEG 29KT 3589 9512

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 7:01 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Delaware, Mayes	44 min
May 11, 7:11 PM CDT	Special Weather Statement	TSA	Wagoner	34 min
May 11, 7:14 PM CDT	Special Weather Statement	TSA	McIntosh	31 min
May 11, 7:27 PM CDT	Special Weather Statement	TSA	Muskogee	33 min
May 11, 7:30 PM CDT	Severe Thunderstorm Warning	TSA	Delaware, Ottawa	30 min
May 11, 7:33 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Delaware	42 min
May 11, 7:41 PM CDT	Special Weather Statement	TSA	Pittsburg	34 min
May 11, 8:04 PM CDT	River Flood Warning	TSA	Nowata	36 hr
May 11, 8:17 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee	43 min
May 12, 6:26 AM CDT	River Flood Warning	TSA	Rogers, Tulsa	38 hr
May 12, 8:24 AM CDT	River Flood Warning	TSA	Osage, Tulsa	39 hr
May 11, 8:08 PM CDT	Special Weather Statement	TSA	Benton	37 min
May 11, 8:49 PM CDT	Special Weather Statement	TSA	Benton	26 min
May 11, 9:28 PM CDT	Special Weather Statement	TSA	Washington	47 min
May 12, 6:59 AM CDT	Areal Flood Advisory	TSA	Benton, Washington	3 hr

Nearby

Special Weather Statements in Oklahoma, 2017 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.