Alert archive / Oklahoma / Special Weather Statements in 2017

Special Weather Statement, NWS Tulsa, OK

February 28, 2017Washington County, Oklahoma

NWS Tulsa, OK issued this special weather statement at Feb 28, 2017, 10:59 PM CST for Washington County, Oklahoma. It was in force for 31 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: Feb 28, 2017, 10:59 PM CST (04:59 UTC)
Expired: Feb 28, 2017, 11:30 PM CST
In force: 31 min
Issued by: NWS Tulsa, OK

County Washington County, OK

The radar

The Tulsa radar (KINX), 90 km from the middle of the area, began a volume at 05:02 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, 5.0 hours before the alert went out and 189 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: 1117 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 931 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 341 m²/s²
0-3 km storm-relative helicity: 315 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 8.2

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 Feb 28, 8:35 PM CST, 2 hours 24 minutes earlier.

Area forecast discussion, Feb 28, 8:35 PM CST, 2 hours 24 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
835 PM CST Tue Feb 28 2017

.DISCUSSION...
Have increased pops across far northeast Oklahoma and for
later tonight as a cold front currently across southeast
Oklahoma moves into the area. The latest runs of the HRRR
are beginning to highlight upscale growth of thunderstorms
across northeast Oklahoma as the front moves into the state
and a surface low tracks across the area. Also expect to
see development southward along the front as it moves across
the area overnight. The front is expected to exit the area
to the south and east as we approach sunrise on Wednesday.
Any of the storms that develop tonight are expected to have
the potential become severe with more than adequate shear and
instability in place. Tornadoes, very large hail and damaging
winds of around 70 mph possible.

&&

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

SHORT TERM...10

Hazardous weather outlook, Feb 28, 8:49 PM CST, 2 hours 10 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
849 PM CST Tue Feb 28 2017

ARZ001-002-010-011-019-020-029-OKZ049-053>076-011130-
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-
849 PM CST Tue Feb 28 2017

...SEVERE WEATHER POTENTIAL CONTINUES THROUGH TONIGHT...

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

.DAY ONE...Tonight.
TORNADO.
	RISK...Elevated.
	AREA...NORTHEAST OKLAHOMA INTO WESTERN ARKANSAS.
	ONSET...ONGOING.

SEVERE THUNDERSTORM.
	RISK...Significant.
	AREA...MUCH OF EASTERN OKLAHOMA AND WESTERN ARKANSAS.
	ONSET...ONGOING.

	AREA AT GREATEST RISK...FAR NORTHEAST OKLAHOMA AND WESTERN ARKANSAS .

DISCUSSION...
THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG AND AHEAD OF A COLD FRONT
THAT WILL MOVE THROUGH THE AREA OVERNIGHT. THUNDERSTORMS WILL BEGIN
TO INCREASE ACROSS NORTHEAST OKLAHOMA BEFORE MIDNIGHT WITH THE
FRONT AND THE THUNDERSTORMS QUICKLY SPREADING TO THE EAST AS THE
NIGHT WEARS ON. ANY THUNDERSTORMS THAT DEVELOP WILL HAVE THE POTENTIAL
TO BE SEVERE WITH VERY LARGE HAIL, WIND GUSTS TO AROUND 70 MPH AND
POSSIBLY TORNADOES. THE THREAT FOR THE THUNDERSTORMS WILL END BEFORE
SUNRISE WEDNESDAY AS THE FRONT EXITS TO THE EAST.

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

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
WEDNESDAY...High Wind Potential.
THURSDAY AND FRIDAY...No Hazards.
SATURDAY...High Wind Potential.
SUNDAY...Thunderstorm Potential...High Wind Potential.
MONDAY...Thunderstorm Potential.

EXTENDED DISCUSSION...
Breezy northwesterly winds will prevail on Wednesday
behind the passing cold front.  A return to warmer
temperatures and gusty south winds arrive on Saturday.
This will raise fire weather concerns.  Thunderstorm
chances increase on Sunday along as the next storm
system moves through the Plains.

weather.gov/tulsa Contains additional information.

In the hours before

Special weather statement, Feb 28, 10:25 PM CST, 34 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1025 PM CST TUE FEB 28 2017

OKZ054-010515-
Osage OK-
1025 PM CST TUE FEB 28 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OSAGE COUNTY UNTIL
1115 PM CST...

At 1025 PM CST, a strong thunderstorm was located 7 miles southwest
of Elgin, moving northeast at 60 mph.

Nickel size hail will be possible with this storm.

Locations in or near the path include...
Elgin...                          Wah Sha She State Park...

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 tornado watch remains in effect until 400 AM CST for northeastern
Oklahoma.

LAT...LON 3700 9600 3694 9600 3682 9643 3698 9651
      3700 9646
TIME...MOT...LOC 0425Z 247DEG 50KT 3694 9639

Lacy

Special weather statement, Feb 28, 10:42 PM CST, 17 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1042 PM CST TUE FEB 28 2017

OKZ055-010515-
Washington OK-
1042 PM CST TUE FEB 28 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN WASHINGTON COUNTY UNTIL
1115 PM CST...

At 1042 PM CST, a strong thunderstorm was located 4 miles northwest
of Hulah, moving east at 55 mph.

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

Locations in or near the path include...
Copan...

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 tornado watch remains in effect until 400 AM CST for northeastern
Oklahoma.

LAT...LON 3694 9579 3690 9600 3700 9600 3700 9579
TIME...MOT...LOC 0442Z 250DEG 49KT 3699 9607

Lacy

Special weather statement, Feb 28, 10:59 PM CST, 0 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1059 PM CST TUE FEB 28 2017

OKZ054-055-010530-
Osage OK-Washington OK-
1059 PM CST TUE FEB 28 2017

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OSAGE AND NORTHERN
WASHINGTON COUNTIES UNTIL 1130 PM CST...

At 1059 PM CST, a strong thunderstorm was located near Hulah, moving
northeast 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...
Copan...                          Hulah...
Wah Sha She State Park...

A tornado watch remains in effect until 400 AM CST for northeastern
Oklahoma.

LAT...LON 3694 9579 3694 9581 3690 9581 3683 9612
      3694 9619 3700 9607 3700 9579
TIME...MOT...LOC 0459Z 245DEG 46KT 3691 9608

Lacy

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 10:29 PM CST	Severe Thunderstorm Warning	TSA	Osage	31 min
Feb 28, 10:42 PM CST	Special Weather Statement	TSA	Washington	33 min
Feb 28, 11:06 PM CST	Special Weather Statement	TSA	Craig, Nowata, Washington	24 min
Feb 28, 11:10 PM CST	Severe Thunderstorm Warning	TSA	Nowata, Washington	50 min
Feb 28, 11:35 PM CST	Special Weather Statement	TSA	Craig, Nowata, Ottawa	55 min
Feb 28, 11:39 PM CST	Special Weather Statement	TSA	Haskell, Pittsburg	36 min
Feb 28, 11:50 PM CST	Severe Thunderstorm Warning	TSA	Pittsburg	40 min
Mar 1, 12:19 AM CST	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg	56 min
Mar 1, 12:26 AM CST	Special Weather Statement	TSA	Haskell, Sequoyah	34 min
Mar 1, 12:40 AM CST	Special Weather Statement	TSA	Pushmataha	50 min
Mar 1, 12:47 AM CST	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	43 min
Mar 1, 12:49 AM CST	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pittsburg, Pushmataha	41 min
Mar 1, 12:52 AM CST	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore	38 min
Mar 1, 1:09 AM CST	Special Weather Statement	TSA	Choctaw	51 min
Mar 1, 1:19 AM CST	Special Weather Statement	TSA	Adair, Cherokee	26 min
Mar 1, 1:27 AM CST	Special Weather Statement	TSA	LeFlore	33 min
Mar 1, 1:43 AM CST	Special Weather Statement	TSA	Adair, Cherokee	32 min
Mar 1, 2:07 AM CST	Special Weather Statement	TSA	Adair	38 min
Mar 1, 1:27 PM CST	Red Flag Warning	TSA	Adair, Cherokee, Choctaw, Creek, Haskell, Latimer and 13 more	6 hr
Mar 1, 1:09 AM CST	Severe Thunderstorm Warning	TSA	Crawford, Franklin, Madison, Sebastian	36 min

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.