Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 17, NWS Tulsa, OK

April 6, 2010Osage County, Pawnee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 6, 2010, 9:37 PM CDT for Osage County, Pawnee County, Oklahoma. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 6, 2010, 9:37 PM CDT (02:37 UTC)
Expired: Apr 6, 2010, 10:30 PM CDT
In force: 53 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Osage County, OK, Pawnee County, OK

The radar

The Tulsa radar (KINX), 94 km from the middle of the area, began a volume at 02:38 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 6, 8:53 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 2.6 hours before the alert went out and 85 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: 1675 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1732 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 291 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 11.9

Open this sounding in Storm Lab

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 Apr 6, 8:28 PM CDT, 1 hour 9 minutes earlier.

Area forecast discussion, Apr 6, 8:28 PM CDT, 1 hour 9 minutes before

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Hazardous weather outlook, Apr 6, 5:10 PM CDT, 4 hours 27 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
510 PM CDT TUE APR 6 2010

ARZ001-002-010-011-019-020-029-OKZ049-053>076-071000-
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-
510 PM CDT TUE APR 6 2010

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

.DAY ONE...TODAY AND TONIGHT.
TORNADO.
	RISK...ELEVATED.
	AREA...MAINLY NORTH AND WEST OF TULSA.
	ONSET...THIS EVENING.

SEVERE THUNDERSTORM.
	RISK...ELEVATED.
	AREA...EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...THIS EVENING.

FLASH FLOOD.
	RISK...LIMITED.
	AREA...EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...AFTER 9 PM.

SIGNIFICANT WINDS.
	RISK...ELEVATED.
	AREA...EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...ONGOING.

FIRE WEATHER DANGER.
	RISK...LIMITED...SPREADINDEX=38.
	AREA...EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
	ONSET...ONGOING.

DISCUSSION...
A VERY DYNAMIC UPPER LEVEL SYSTEM AND ITS ASSOCIATED DRY
LINE AND COLD FRONT WILL MOVE INTO EASTERN OKLAHOMA TONIGHT.
STRONG SOUTH WINDS HAVE OCCURRED AHEAD OF THE SYSTEM TODAY
AND WILL LAST INTO THE EARLY EVENING HOURS.  THESE SOUTH
WINDS...WARM TEMPERATURES AND DRY VEGETATION HAVE RESULTED
IN AN INCREASED FIRE DANGER.

AS THE DRY LINE IS OVERTAKEN BY THE COLD FRONT THIS EVENING
THUNDERSTORMS WILL FORM TO THE WEST OF THE AREA THIS EVENING.
A LARGE CAP EXISTS OVER THE AREA SO THUNDERSTORMS ARE NOT
VERY LIKELY UNTIL THE FRONT ARRIVES.  WHEN THUNDERSTORMS
FORM THEY WILL LIKELY BECOME SEVERE.  GIVE SOME AND INSTABILITY
AND SHEAR TORNADOES WILL BE POSSIBLE.  THE MOST LIKELY PLACE
FOR A TORNADO WOULD BE NORTH AND WEST OF TULSA.  AS THE
NIGHT PROGRESSES A SCATTERED TO BROKEN LINE OF THUNDERSTORMS
WILL LIKELY OCCUR.  THE BEST TIMING FOR THIS TO HAPPEN WOULD
BE LATE EVENING TO THE OVERNIGHT HOURS.  IN THIS TIME FRAME
HAIL AND STRONG WINDS WOULD BE THE MAIN RISKS.

THE COLD FRONT WILL NOT REACH NORTHWEST ARKANSAS BEFORE
MORNING SO THAT WILL BE THE LEAST LIKELY AREA FOR SEVERE
THUNERSTORMS TONIGHT.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
ACTIVATION OF THE REGIONAL SPOTTER NETWORK LIKELY.

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

EXTENDED DISCUSSION...
WITH THE COLD FRONT OVER EASTERN PARTS OF THE AREA WEDNESDAY
MORNING...THE SEVERE THUNDERSTORM RISK WILL CONTINUE FOR THOSE
AREAS AHEAD OF THE FRONT. THE COLD FRONT WILL EXIT THE AREA
AROUND NOON.

AFTER THAT THE REMAINDER OF THE UPCOMING WEEK WILL BE DRY.

EMERGENCY MANAGEMENT PLANNING STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED ACROSS FAR EASTERN OKLAHOMA
AND NORTHWEST ARKANSAS WEDNESDAY MORNING.

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

In the hours before

Special weather statement, Apr 6, 8:51 PM CDT, 46 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
851 PM CDT TUE APR 6 2010

OKZ054-070215-
OSAGE OK-
851 PM CDT TUE APR 6 2010

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY EFFECTIVE UNTIL 915 PM CDT
FOR THE FOLLOWING COUNTY...

IN NORTHEAST OKLAHOMA
     NORTHERN OSAGE

AT 851 PM CDT...A STRONG THUNDERSTORM WAS LOCATED OVER SHIDLER...
MOVING NORTHEAST AT 55 MPH. SOME LOCATIONS THAT WILL BE AFFECTED BY
THIS STORM INCLUDE...SHIDLER...FORAKER AND GRAINOLA.

THIS STORM WILL BE CAPABLE OF PRODUCING PENNY SIZE HAIL. RESIDENTS IN
THESE AREAS SHOULD REMAIN ALERT IN CASE THE SIGNIFICANT WEATHER
ADVISORY IS UPGRADED TO A WARNING.

LAT...LON 3700 9650 3700 9628 3699 9628 3671 9663
      3680 9676 3686 9676 3701 9660 3700 9651
TIME...MOT...LOC 0151Z 222DEG 50KT 3683 9663

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 6, 8:51 PM CDT	Special Weather Statement	TSA	Osage	24 min
Apr 6, 10:25 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Tulsa, Washington	65 min
Apr 6, 11:24 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Rogers, Washington	51 min
Apr 6, 11:29 PM CDT	Special Weather Statement	TSA	Creek, Rogers, Tulsa	61 min
Apr 6, 11:49 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Creek, Mayes, Osage, Rogers, Tulsa and 2 more	56 min
Apr 6, 11:53 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata, Ottawa, Rogers	52 min
Apr 7, 12:12 AM CDT	Severe Thunderstorm Warning	TSA	Okfuskee, Okmulgee	26 min
Apr 7, 12:31 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Craig, Delaware, Mayes, Ottawa and 3 more	59 min
Apr 7, 12:50 AM CDT	Special Weather Statement	TSA	McIntosh	40 min
Apr 7, 1:22 AM CDT	Special Weather Statement	TSA	Haskell, McIntosh, Muskogee	53 min
Apr 7, 1:27 AM CDT	Special Weather Statement	TSA	Delaware	63 min
Apr 7, 2:14 AM CDT	Special Weather Statement	TSA	Adair	61 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2010 Every severe thunderstorm warning in 2010

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.