Alert archive / Oklahoma / Special Weather Statements in 2015

Special Weather Statement, NWS Tulsa, OK

April 18, 2015Osage County, Oklahoma

NWS Tulsa, OK issued this special weather statement at Apr 18, 2015, 11:39 PM CDT for Osage County, Oklahoma. It was in force for 36 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: Apr 18, 2015, 11:39 PM CDT (04:39 UTC)
Expired: Apr 19, 2015, 12:15 AM CDT
In force: 36 min
Issued by: NWS Tulsa, OK

County Osage County, OK

The radar

The Wichita radar (KICT), 110 km from the middle of the area, began a volume at 04:39 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

Norman, OK (KOUN), launched 00:00Z, 4.7 hours before the alert went out and 207 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: 927 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1566 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 72 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Apr 18, 11:31 PM CDT, 8 minutes earlier.

Area forecast discussion, Apr 18, 11:31 PM CDT, 8 minutes before

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Hazardous weather outlook, Apr 18, 4:45 PM CDT, 6 hours 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
445 PM CDT SAT APR 18 2015

ARZ001-002-010-011-019-020-029-OKZ049-053>076-191030-
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-
445 PM CDT SAT APR 18 2015

...STORMS ARRIVE THIS EVENING AND OVERNIGHT BUT THE BEST SEVERE
POTENTIAL WILL BE ON SUNDAY...

THIS OUTLOOK IS FOR NORTHWEST AND WEST CENTRAL ARKANSAS AS WELL AS
MUCH OF EASTERN OKLAHOMA.

.DAY ONE...LATE AFTERNOON THROUGH TONIGHT.

SEVERE THUNDERSTORM.
	RISK...LIMITED.
	AREA...WEST OF HIGHWAY 75.
	ONSET...AFTER 8 PM.

FLASH FLOOD.
	RISK...ELEVATED.
	AREA...FAR NORTHEAST AND EAST CENTRAL OKLAHOMA...FAR NORTHWEST
        ARKANSAS.
 	ONSET...AFTER MIDNIGHT.

DISCUSSION...
THUNDERSTORMS ALONG AND AHEAD OF THE DRYLINE ACROSS WESTERN OKLAHOMA
ARE FORECAST TO MOVE SLOWLY EAST DURING THE EVENING AND OVERNIGHT.
THE STORMS WILL BE CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL
INITIALLY...WITH AN EVENTUAL ORGANIZATION INTO A LINE WITH A
DAMAGING WIND THREAT. THE GREATEST SEVERE WEATHER THREAT IS EXPECTED
TO BE ALONG AND WEST OF HIGHWAY 75 IN EASTERN OKLAHOMA.

AS THESE STORMS MOVE OVER AREAS THAT RECEIVED HEAVY RAIN LAST
NIGHT INTO THIS MORNING ACROSS FAR NORTHEAST AND EAST CENTRAL
OKLAHOMA AS WELL AS FAR NORTHWEST ARKANSAS...THE FLOOD THREAT WILL
INCREASE.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
LOCAL SPOTTER ACTIVATION MAY BE NEEDED.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.
SUNDAY...SEVERE THUNDERSTORM POTENTIAL...HIGH WIND POTENTIAL.
MONDAY...NO HAZARDS.
TUESDAY...THUNDERSTORM POTENTIAL.
WEDNESDAY...THUNDERSTORM POTENTIAL.
THURSDAY...THUNDERSTORM POTENTIAL.
FRIDAY...THUNDERSTORM POTENTIAL.

EXTENDED DISCUSSION...
THE GREATER POTENTIAL FOR SEVERE STORMS WILL BE ON SUNDAY
AFTERNOON...FROM ROUGHLY 2 PM TO 10 PM. THE AREA WITH THE GREATEST
POTENTIAL WILL BE ALONG AND EAST OF HIGHWAY 69 IN EASTERN OKLAHOMA
OVER INTO NORTHWEST ARKANSAS. THE COMBINATION OF SHEAR AND
INSTABILITY WILL ALLOW FOR THE DEVELOPMENT OF SOME SUPERCELL
STORMS...WITH THE POTENTIAL TO PRODUCE HAIL TO TENNIS BALL SIZE AND
WIND GUSTS OF 60 TO 70 MPH. AN ISOLATED TORNADO IS POSSIBLE...BUT
THE OVERALL THREAT IS LOW.

A COLD FRONT WILL SWEEP ACROSS THE REGION ON SUNDAY...IN
ASSOCIATION WITH A UPPER LEVEL WAVE THAT WILL BE MOVING ACROSS THE
PLAINS. THUNDERSTORMS WILL DEVELOP AHEAD OF THIS FRONT AND WILL
EXIT THE REGION AS THE FRONT CLEARS OUR AREA BY MIDNIGHT SUNDAY
NIGHT.

CHANCES FOR STORMS WILL RETURN TO THE FORECAST FOR THE MID TO
LATTER HALF OF NEXT WEEK...MAINLY IN RESPONSE TO MOISTURE RETURN
IN A NW FLOW REGIME. AN UPPER LEVEL WAVE MAY ENHANCE THE SEVERE
POTENTIAL TOWARD THE END OF THE WORK WEEK.

WWW.SRH.NOAA.GOV/TULSA CONTAINS ADDITIONAL INFORMATION.

In the hours before

Special weather statement, Apr 18, 8:37 PM CDT, 3 hours 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
837 PM CDT SAT APR 18 2015

OKZ064-065-190230-
CREEK OK-OKFUSKEE OK-
837 PM CDT SAT APR 18 2015

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 930 PM CDT
FOR THE FOLLOWING COUNTIES...

IN NORTHEAST OKLAHOMA
     WESTERN CREEK

IN EAST CENTRAL OKLAHOMA
     OKFUSKEE

AT 837 PM CDT...STRONG THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 25 MILES WEST OF MILFAY TO 9 MILES WEST OF PADEN TO 33
MILES SOUTHWEST OF BEARDEN...MOVING NORTHEAST AT 25 MPH. SOME
LOCATIONS THAT WILL BE AFFECTED BY THESE STORMS INCLUDE...OKEMAH...
BEARDEN...CASTLE...PADEN...BOLEY...MASON...OKFUSKEE...WELTY...
BRISTOW...MILFAY...SLICK...DEPEW...SHAMROCK...DRUMRIGHT AND OILTON.

THESE STORMS WILL BE CAPABLE OF PRODUCING NICKEL SIZE HAIL AND WIND
GUSTS OF 40 TO 50 MPH.

LAT...LON 3612 9663 3616 9657 3577 9621 3528 9624
      3529 9645 3545 9645 3545 9648 3543 9649
      3545 9655 3543 9655 3540 9653 3539 9654
      3540 9658 3540 9663
TIME...MOT...LOC 0137Z 239DEG 27KT 3579 9697 3553 9669
          3509 9683

Special weather statement, Apr 18, 9:28 PM CDT, 2 hours 11 minutes before

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Special weather statement, Apr 18, 10:17 PM CDT, 1 hour 22 minutes before

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Special weather statement, Apr 18, 10:42 PM CDT, 57 minutes before

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Special weather statement, Apr 18, 11:10 PM CDT, 29 minutes before

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Special weather statement, Apr 18, 11:39 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 8:37 PM CDT	Special Weather Statement	TSA	Creek, Okfuskee	53 min
Apr 18, 8:42 PM CDT	River Flood Warning	TSA	LeFlore	18 hr
Apr 18, 9:28 PM CDT	Special Weather Statement	TSA	Creek, Okfuskee	47 min
Apr 18, 10:17 PM CDT	Special Weather Statement	TSA	Okmulgee, Tulsa	28 min
Apr 18, 10:42 PM CDT	Special Weather Statement	TSA	Hughes	48 min
Apr 18, 11:10 PM CDT	Special Weather Statement	TSA	Pittsburg	50 min
Apr 18, 11:51 PM CDT	Special Weather Statement	TSA	Pittsburg	24 min
Apr 19, 2:37 PM CDT	Special Weather Statement	TSA	Haskell	23 min
Apr 19, 2:56 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	34 min
Apr 19, 3:13 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	47 min
Apr 19, 3:52 PM CDT	Special Weather Statement	TSA	Okfuskee	38 min
Apr 19, 3:54 PM CDT	Special Weather Statement	TSA	Pawnee	36 min
Apr 19, 4:10 PM CDT	Special Weather Statement	TSA	Wagoner	35 min
Apr 19, 4:11 PM CDT	Special Weather Statement	TSA	McIntosh	34 min
Apr 19, 4:23 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee	37 min
Apr 19, 4:24 PM CDT	Special Weather Statement	TSA	Washington	36 min
Apr 19, 4:28 PM CDT	Severe Thunderstorm Warning	TSA	Creek	47 min
Apr 19, 4:34 PM CDT	Special Weather Statement	TSA	Pittsburg	41 min
Apr 19, 4:40 PM CDT	Special Weather Statement	TSA	McIntosh	35 min
Apr 19, 4:41 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	49 min
Apr 19, 4:44 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Muskogee, Sequoyah	46 min
Apr 19, 4:47 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, McIntosh, Muskogee	43 min
Apr 19, 4:56 PM CDT	Special Weather Statement	TSA	Rogers	34 min
Apr 19, 5:00 PM CDT	Special Weather Statement	TSA	Adair	30 min
Apr 19, 5:04 PM CDT	Severe Thunderstorm Warning	TSA	Adair	41 min
Apr 19, 5:09 PM CDT	Severe Thunderstorm Warning	TSA	Sequoyah	20 min
Apr 19, 5:12 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	48 min
Apr 19, 5:25 PM CDT	Special Weather Statement	TSA	Sequoyah	35 min
Apr 19, 5:40 PM CDT	Special Weather Statement	TSA	Pushmataha	35 min
Apr 19, 5:42 PM CDT	Special Weather Statement	TSA	Craig, Nowata, Washington	48 min
Apr 19, 5:52 PM CDT	Severe Thunderstorm Warning	TSA	Pushmataha	34 min
Apr 19, 6:29 PM CDT	Special Weather Statement	TSA	Craig, Ottawa	61 min
Apr 19, 3:43 PM CDT	Severe Thunderstorm Warning	TSA	Franklin, Sebastian	47 min
Apr 19, 4:28 PM CDT	Special Weather Statement	TSA	Madison	32 min
Apr 19, 5:20 PM CDT	Special Weather Statement	TSA	Benton	40 min
Apr 19, 5:24 PM CDT	Severe Thunderstorm Warning	TSA	Benton, Washington	26 min
Apr 19, 6:00 PM CDT	Special Weather Statement	TSA	Franklin	30 min
Apr 19, 6:08 PM CDT	Special Weather Statement	TSA	Franklin	37 min
Apr 19, 6:12 PM CDT	Special Weather Statement	TSA	Carroll, Madison	48 min
Apr 19, 6:16 PM CDT	Severe Thunderstorm Warning	TSA	Franklin	29 min

Nearby

Special Weather Statements in Oklahoma, 2015 Every special weather statement in 2015

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.