Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 7, NWS Tulsa, OK

February 10, 2009Nowata County, Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Feb 10, 2009, 6:28 PM CST for Nowata County, Washington County, Oklahoma. It was in force for 47 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Feb 10, 2009, 6:28 PM CST (00:28 UTC)
Expired: Feb 10, 2009, 7:15 PM CST
In force: 47 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Nowata County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 87 km from the middle of the area, began a volume at 00:29 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.

What was reported inside it

Time	Report	Where	Remark
Feb 10, 6:50 PM CST	HAIL 0.88	Wann, OK

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

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

Issued	Product	Office	Lasted
Feb 10, 2:42 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 0.5 hours before the alert went out and 180 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: 7 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1210 m above ground
0-6 km bulk shear: 76 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KTSA 110028
SVRTSA
OKC105-147-110115-
/O.NEW.KTSA.SV.W.0007.090211T0028Z-090211T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
628 PM CST TUE FEB 10 2009

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN NOWATA COUNTY IN NORTHEAST OKLAHOMA
  WASHINGTON COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 715 PM CST

* AT 625 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL AND
  WINDS TO 60 MPH. THIS STORM WAS LOCATED NEAR COPAN...MOVING
  NORTHEAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL
  AREAS OF THE INDICATED COUNTIES.

A TORNADO WATCH IS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP SUDDENLY FROM SEVERE THUNDERSTORMS. IF YOU ARE NEAR THE PATH
OF THIS STORM...BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS.
TAKE COVER ON THE LOWEST FLOOR IN AN INTERIOR ROOM AND STAY AWAY FROM
WINDOWS.

STAY INDOORS AND AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3700 9564 3680 9581 3687 9600 3699 9601
TIME...MOT...LOC 0029Z 213DEG 38KT 3694 9588

$$

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 Feb 10, 5:29 PM CST, 59 minutes earlier.

Area forecast discussion, Feb 10, 5:29 PM CST, 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
529 PM CST TUE FEB 10 2009

.DISCUSSION...

.AVIATION...
AREAS OF SHOWERS AND THUNDERSTORMS PERSIST LATE
THIS AFTERNOON ACROSS EASTERN OK AND WESTERN
AR...WHILE A LINE OF SEVERE THUNDERSTORMS OVER
CENTRAL OK CONTINUES TO PRESS SLOWLY EAST. OCCASIONAL
IFR CIGS AND VISIBILITIES AROUND 1SM WILL BE
POSSIBLE IN ANY THUNDERSTORMS...ALONG WITH VERY
GUSTY WINDS...MAINLY THROUGH THE EVENING HOURS.
THUNDERSTORMS SHOULD BEGIN TO DIMINISH AREAWIDE
AFTER ABOUT 09Z...ALTHOUGH MVFR CIGS AND AREAS OF
SHOWERS MAY PERSIST.

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...FLOOD WATCH UNTIL 6 AM WEDNESDAY FOR OKZ049-OKZ053-OKZ076.

AR...FLOOD WATCH UNTIL 6 AM WEDNESDAY FOR ARZ001-ARZ002-ARZ010-ARZ011-
     ARZ019-ARZ020-ARZ029.

&&

AVIATION...18

Hazardous weather outlook, Feb 10, 5:10 PM CST, 1 hour 18 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
510 PM CST TUE FEB 10 2009

ARZ001-002-010-011-019-020-029-OKZ049-053>076-111100-
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-
446 PM CST TUE FEB 10 2009

...WIDESPREAD SEVERE WEATHER EXPECTED TONIGHT...

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

.DAY ONE...TODAY AND TONIGHT.
TORNADO.
RISK...SIGNIFICANT.
AREA...ALL OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...ONGOING.

SEVERE THUNDERSTORM.
RISK...SIGNIFICANT.
AREA...ALL OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...ONGOING.

FLASH FLOOD.
RISK...ELEVATED.
AREA...SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...MAINLY AFTER 9 PM.
AREA AT GREATEST RISK...SOUTHEAST OKLAHOMA INTO NORTHWEST ARKANSAS.

HEAVY RAIN.
RISK...SIGNIFICANT.
AREA...EASTERN OKLAHOMA AND NORTHWEST ARKANSAS.
ONSET...MAINLY AFTER 9 PM.
AREA AT GREATEST RISK...SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS.

DISCUSSION...
A STRONG UPPER LEVEL STORM SYSTEM WILL MOVE ACROSS THE AREA
TONIGHT. SCATTERED SEVERE THUNDERSTORMS WERE OCCURRING AT THE TIME
OF THIS ISSUANCE. OTHER STRONG TO SEVERE THUNDERSTORMS WILL
CONTINUE TO DEVELOP ACROSS CENTRAL OKLAHOMA DURING THE EVENING
AND MOVE EASTWARD INTO DEEPER...MOIST UNSTABLE AIR. WIND FIELDS ALOFT
WILL PROVIDE SUFFICIENT SHEAR TO DEVELOP SUPER CELLS WITH THE
POTENTIAL FOR TORNADO DEVELOPMENT. TORNADOES HAVE ALREADY OCCURRED
DURING THE AFTERNOON WITH SOME OF THE THUNDERSTORMS. LARGE HAIL TO
THE SIZE OF GOLF BALLS WILL ALSO BE POSSIBLE. THE SYSTEM WILL MOVE
RAPIDLY EAST DURING THE NIGHT...EXITING EASTERN OKLAHOMA BETWEEN
MIDNIGHT AND ABOUT 2 AM. THE SEVERE POTENTIAL SHOULD MOVE OUT OF NORTHWEST
ARKANSAS BY AROUND 4 TO 6 AM.

SPOTTER AND EMERGENCY MANAGEMENT ACTION
STATEMENT... SPOTTER ACTIVATION WILL BE NEEDED.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
WEDNESDAY...SEVERE THUNDERSTORM POTENTIAL EARLY...VERY HIGH FIRE
WEATHER POTENTIAL...HIGH WIND POTENTIAL.
THURSDAY...NO HAZARDS.
FRIDAY...THUNDERSTORM POTENTIAL...VERY HIGH FIRE WEATHER
POTENTIAL...HIGH WIND POTENTIAL.
SATURDAY...VERY HIGH FIRE WEATHER
POTENTIAL...HIGH WIND POTENTIAL.
SUNDAY...NO HAZARDS.
MONDAY...NO HAZARDS.

EXTENDED DISCUSSION...
THUNDERSTORMS ARE NOW EXPECTED TO END AROUND SUNRISE WEDNESDAY.
HOWEVER...INCREASING DRY SOUTHWEST WINDS ON FRIDAY WILL RESULT IN
HIGH WILD FIRE RISK AS GRASSES WILL DRY QUICKLY DESPITE THE PREVIOUS
RAINS. A COOL DOWN TO MORE SEASONABLE TEMPERATURES IS EXPECTED BY
LATE WEEK...ALONG WITH CHANCES FOR RAIN.

WWW.SRH.NOAA.GOV/TULSA CONTAINS ADDITIONAL TABULAR AND GRAPHICAL
INFORMATION. $$

In the hours before

Local storm report, Feb 10, 5:40 PM CST, 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
540 PM CST TUE FEB 10 2009

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

0538 PM     HAIL             3 E PAWHUSKA            36.67N 96.28W
02/10/2009  E0.75 INCH       OSAGE              OK   AMATEUR RADIO

&&

SFP

Local storm report, Feb 10, 5:45 PM CST, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
545 PM CST TUE FEB 10 2009

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

0545 PM     HAIL             PAWHUSKA                36.67N 96.34W
02/10/2009  E1.00 INCH       OSAGE              OK   AMATEUR RADIO

&&

SFP

Local storm report, Feb 10, 5:52 PM CST, 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
552 PM CST TUE FEB 10 2009

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

0534 PM     HAIL             WYNONA                  36.55N 96.33W
02/10/2009  E2.75 INCH       OSAGE              OK   LAW ENFORCEMENT

0544 PM     HAIL             NELAGONEY               36.63N 96.24W
02/10/2009  E2.75 INCH       OSAGE              OK   LAW ENFORCEMENT

&&

PBS

Local storm report, Feb 10, 6:00 PM CST, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
600 PM CST TUE FEB 10 2009

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

0557 PM     HAIL             4 S PAWHUSKA            36.61N 96.34W
02/10/2009  E1.00 INCH       OSAGE              OK   AMATEUR RADIO

            HAIL COVERED THE GROUND

&&

SFP

Local storm report, Feb 10, 6:22 PM CST, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
622 PM CST TUE FEB 10 2009

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

0620 PM     HAIL             COPAN                   36.90N 95.93W
02/10/2009  E1.00 INCH       WASHINGTON         OK   BROADCAST MEDIA

&&

PBS

Local storm report, Feb 10, 6:27 PM CST, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
627 PM CST TUE FEB 10 2009

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

0620 PM     HAIL             5 W BARTLESVILLE        36.75N 96.07W
02/10/2009  E1.00 INCH       OSAGE              OK   AMATEUR RADIO

            HAIL COVERING THE GROUND NEAR HWY 60.

&&

PBS

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 10, 6:18 PM CST	Severe Thunderstorm Warning	TSA	Osage, Pawnee, Washington	57 min
Feb 10, 6:25 PM CST	Areal Flood Advisory	TSA	Nowata, Washington	2 hr
Feb 10, 6:44 PM CST	Severe Thunderstorm Warning	TSA	Craig, Creek, Mayes, Nowata, Osage, Rogers and 2 more	78 min
Feb 10, 6:52 PM CST	Flash Flood Warning	TSA	Nowata, Washington	4 hr
Feb 10, 7:11 PM CST	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	64 min
Feb 10, 7:37 PM CST	Areal Flood Advisory	TSA	Creek, Tulsa	53 min
Feb 10, 8:55 PM CST	Special Weather Statement	TSA	Adair, Cherokee, Haskell, Latimer, McIntosh, Muskogee and 1 more	80 min
Feb 10, 9:22 PM CST	Special Weather Statement	TSA	Delaware	38 min
Feb 10, 9:46 PM CST	Special Weather Statement	TSA	Adair	74 min
Feb 10, 9:49 PM CST	Special Weather Statement	TSA	Choctaw, Haskell, Latimer, Pushmataha, Sequoyah	71 min
Feb 10, 10:18 PM CST	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, Pittsburg, Pushmataha	57 min
Feb 10, 11:00 PM CST	Special Weather Statement	TSA	Choctaw, LeFlore, Pushmataha, Sequoyah	75 min
Feb 10, 11:13 PM CST	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, Pushmataha	62 min
Feb 10, 11:35 PM CST	Areal Flood Advisory	TSA	LeFlore, Sequoyah	115 min
Feb 11, 6:24 AM CST	Wind Advisory	TSA	Craig, Creek, Delaware, Mayes, Nowata, Ottawa and 4 more	7 hr
Feb 11, 8:13 AM CST	Areal Flood Advisory	TSA	Craig, Mayes, Rogers	2 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.