Alert archive / Oklahoma / Special Weather Statements in 2017

Special Weather Statement, NWS Tulsa, OK

March 1, 2017Adair County, Cherokee County, Oklahoma; Benton County, Arkansas

NWS Tulsa, OK issued this special weather statement at Mar 1, 2017, 1:43 AM CST for Adair County, Cherokee County, Oklahoma; Benton County, Arkansas. It was in force for 32 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
Mar 1, 2017, 1:43 AM CST (07:43 UTC)
Expired
Mar 1, 2017, 2:15 AM CST
In force
32 min
Issued by
NWS Tulsa, OK

Counties Benton County, AR, Adair County, OK, Cherokee County, OK

The radar

The Western Arkansas radar (KSRX), 93 km from the middle of the area, began a volume at 07:44 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, 7.7 hours before the alert went out and 105 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-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 2017-03-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1117 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 00:00Z on 2017-03-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 341 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
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, 11:37 PM CST, 2 hours 6 minutes earlier.

Area forecast discussion, Feb 28, 11:37 PM CST, 2 hours 6 minutes before
Area Forecast Discussion
National Weather Service Tulsa OK
1137 PM CST Tue Feb 28 2017

.AVIATION...
CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG.
Cold front moving through eastern Oklahoma and western Arkansas
during the early portion of the TAF period with thunderstorms
occurring along and ahead of the boundary. Will see mainly
VFR conditions outside of the thunderstorms with IFR conditions
found in thunderstorm areas. Conditions improve Wednesday morning
behind the front with gusty northwest winds continuing through
the day.

&&

.PREV DISCUSSION... /Issued 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.
&&

AVIATION...10
Hazardous weather outlook, Feb 28, 8:49 PM CST, 4 hours 54 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, Mar 1, 1:09 AM CST, 34 minutes before
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Local storm report, Mar 1, 1:12 AM CST, 31 minutes before
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Special weather statement, Mar 1, 1:19 AM CST, 24 minutes before
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Special weather statement, Mar 1, 1:27 AM CST, 16 minutes before
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Local storm report, Mar 1, 1:41 AM CST, 2 minutes before
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Special weather statement, Mar 1, 1:43 AM CST, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Feb 28, 10:29 PM CSTSevere Thunderstorm WarningTSAOsage31 min
Feb 28, 10:42 PM CSTSpecial Weather StatementTSAWashington33 min
Feb 28, 10:59 PM CSTSpecial Weather StatementTSAWashington31 min
Feb 28, 11:06 PM CSTSpecial Weather StatementTSACraig, Nowata, Washington24 min
Feb 28, 11:10 PM CSTSevere Thunderstorm WarningTSANowata, Washington50 min
Feb 28, 11:35 PM CSTSpecial Weather StatementTSACraig, Nowata, Ottawa55 min
Feb 28, 11:39 PM CSTSpecial Weather StatementTSAHaskell, Pittsburg36 min
Feb 28, 11:50 PM CSTSevere Thunderstorm WarningTSAPittsburg40 min
Mar 1, 12:19 AM CSTSevere Thunderstorm WarningTSALatimer, Pittsburg56 min
Mar 1, 12:26 AM CSTSpecial Weather StatementTSAHaskell, Sequoyah34 min
Mar 1, 12:40 AM CSTSpecial Weather StatementTSAPushmataha50 min
Mar 1, 12:47 AM CSTSevere Thunderstorm WarningTSALeFlore, Sequoyah43 min
Mar 1, 12:49 AM CSTSevere Thunderstorm WarningTSALatimer, LeFlore, Pittsburg, Pushmataha41 min
Mar 1, 12:52 AM CSTSevere Thunderstorm WarningTSAHaskell, Latimer, LeFlore38 min
Mar 1, 1:09 AM CSTSpecial Weather StatementTSAChoctaw51 min
Mar 1, 1:19 AM CSTSpecial Weather StatementTSAAdair, Cherokee26 min
Mar 1, 1:27 AM CSTSpecial Weather StatementTSALeFlore33 min
Mar 1, 2:07 AM CSTSpecial Weather StatementTSAAdair38 min
Mar 1, 1:27 PM CSTRed Flag WarningTSAAdair, Cherokee, Choctaw, Creek, Haskell, Latimer and 13 more6 hr
Mar 1, 1:09 AM CSTSevere Thunderstorm WarningTSACrawford, Franklin, Madison, Sebastian36 min

Nearby

Special Weather Statements in Oklahoma, 2017Special Weather Statements in Arkansas, 2017Every 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.