Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 108, NWS Tulsa, OK

September 18, 2011Adair County, Delaware County, Oklahoma; Benton County, Washington County, Arkansas

NWS Tulsa, OK issued this tornado warning at Sep 18, 2011, 5:42 PM CDT for Adair County, Delaware County, Oklahoma; Benton County, Washington County, Arkansas. It was in force for 48 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
Sep 18, 2011, 5:42 PM CDT (22:42 UTC)
Expired
Sep 18, 2011, 6:30 PM CDT
In force
48 min
Issued by
NWS Tulsa, OK
Area
Storm-based polygon

Counties Benton County, AR, Washington County, AR, Adair County, OK, Delaware County, OK

The radar

The Western Arkansas radar (KSRX), 104 km from the middle of the area, began a volume at 22:42 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.

IssuedProductOfficeLasted
Sep 18, 3:30 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 10.7 hours before the alert went out and 88 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 12:00Z on 2011-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2011-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 228 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1001 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
228 m²/s²
0-3 km storm-relative helicity
350 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

343 
WFUS54 KTSA 182242
TORTSA
ARC007-143-OKC001-041-182330-
/O.NEW.KTSA.TO.W.0108.110918T2242Z-110918T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
542 PM CDT SUN SEP 18 2011

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN ADAIR COUNTY IN NORTHEAST OKLAHOMA
  SOUTHEASTERN DELAWARE COUNTY IN NORTHEAST OKLAHOMA
  SOUTHERN BENTON COUNTY IN NORTHWEST ARKANSAS
  NORTHWESTERN WASHINGTON COUNTY IN NORTHWEST ARKANSAS

* UNTIL 630 PM CDT

* AT 537 PM CDT...A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING
  A TORNADO WAS LOCATED ALONG A LINE EXTENDING FROM 2 MILES NORTH OF
  SILOAM SPRINGS TO 5 MILES WEST OF WEST SILOAM SPRINGS...MOVING EAST
  AT 20 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  SPRINGTOWN...WATTS...HIGHFILL...CAVE SPRINGS...TONTITOWN...
  SPRINGDALE AND LOWELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE NEAR THE PATH OF THIS STORM...TAKE COVER NOW! IF NO
UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR MORE
SUBSTANTIAL SHELTER. AVOID WINDOWS!

&&

LAT...LON 3631 9397 3602 9432 3616 9475 3630 9450
TIME...MOT...LOC 2242Z 286DEG 19KT 3621 9450 3615 9463

$$
2 follow-up statements
748 
WWUS54 KTSA 182259
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
559 PM CDT SUN SEP 18 2011

OKC001-041-182309-
/O.CAN.KTSA.TO.W.0108.000000T0000Z-110918T2330Z/
DELAWARE OK-ADAIR OK-
559 PM CDT SUN SEP 18 2011

...THE TORNADO WARNING FOR NORTHERN ADAIR AND SOUTHEASTERN DELAWARE
COUNTIES IS CANCELLED...

LAT...LON 3602 9432 3611 9454 3613 9456 3630 9450
      3631 9398 3632 9396
TIME...MOT...LOC 2259Z 286DEG 19KT 3618 9439 3612 9451

$$

ARC007-143-182330-
/O.CON.KTSA.TO.W.0108.000000T0000Z-110918T2330Z/
BENTON AR-WASHINGTON AR-
559 PM CDT SUN SEP 18 2011

...TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR
NORTHWESTERN WASHINGTON AND SOUTHERN BENTON COUNTIES...

AT 556 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE SEVERE 
THUNDERSTORMS CAPABLE OF PRODUCING A TORNADO.  THE CIRCULATIONS
WERE LOCATED NEAR GALLITIN TO LAKE FRANCIS...MOVING EAST AT 20 MPH.

SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...
HIGHFILL...ROCKY COMFORT...HEALING SPRINGS...WEDINGTON...HARMON...
CAVE SPRINGS...ELM SPRINGS...SAVOY...TONTITOWN...WHEELER...OAK
GROVE...SPRINGDALE...MONTE NE AND LOWELL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE NEAR THE PATH OF THIS STORM...TAKE COVER NOW! IF NO
UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR MORE
SUBSTANTIAL SHELTER. AVOID WINDOWS!

&&

LAT...LON 3602 9432 3611 9454 3613 9456 3630 9450
      3631 9398 3632 9396
TIME...MOT...LOC 2259Z 286DEG 19KT 3618 9439 3612 9451

$$
041 
WWUS54 KTSA 182330
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
630 PM CDT SUN SEP 18 2011

ARC007-143-182340-
/O.EXP.KTSA.TO.W.0108.000000T0000Z-110918T2330Z/
BENTON AR-WASHINGTON AR-
630 PM CDT SUN SEP 18 2011

...THE TORNADO WARNING FOR NORTHWESTERN WASHINGTON AND SOUTHERN
BENTON COUNTIES EXPIRES AT 630 PM CDT...

THE THUNDERSTORM HAS WEAKENED BELOW SEVERE LIMITS...THEREFORE THE
TORNADO WARNING WILL BE ALLOWED TO EXPIRE.

GUSTY WINDS...SMALL HAIL AND VERY HEAVY RAIN WILL STILL BE POSSIBLE
WITH THIS STORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM.

LAT...LON 3602 9432 3611 9454 3613 9456 3630 9450
      3631 9398 3632 9396
TIME...MOT...LOC 2330Z 286DEG 19KT 3613 9419 3607 9431

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 17, 7:19 PM CDTSevere Thunderstorm WarningTSAOsage, Pawnee56 min
Sep 17, 8:12 PM CDTSevere Thunderstorm WarningTSACreek, Osage, Pawnee, Tulsa, Washington63 min
Sep 17, 8:28 PM CDTTornado WarningTSAOsage32 min
Sep 17, 9:13 PM CDTSpecial Weather StatementTSARogers, Tulsa, Wagoner47 min
Sep 17, 9:38 PM CDTSpecial Weather StatementTSAOkmulgee52 min
Sep 17, 9:59 PM CDTSpecial Weather StatementTSAMuskogee, Okmulgee, Rogers, Wagoner61 min
Sep 17, 10:13 PM CDTSevere Thunderstorm WarningTSAMuskogee, Okmulgee, Tulsa21 min
Sep 17, 10:52 PM CDTSpecial Weather StatementTSAPawnee53 min
Sep 17, 11:11 PM CDTSpecial Weather StatementTSAHaskell, McIntosh, Muskogee, Okmulgee, Wagoner34 min
Sep 18, 12:34 AM CDTSpecial Weather StatementTSAHaskell, Latimer41 min
Sep 18, 3:40 PM CDTSpecial Weather StatementTSATulsa35 min
Sep 18, 4:03 PM CDTSpecial Weather StatementTSADelaware27 min
Sep 18, 4:06 PM CDTSpecial Weather StatementTSAHaskell24 min
Sep 18, 4:08 PM CDTSevere Thunderstorm WarningTSADelaware67 min
Sep 18, 4:24 PM CDTSevere Thunderstorm WarningTSAHaskell, Latimer, LeFlore, Muskogee, Sequoyah66 min
Sep 18, 4:28 PM CDTSevere Thunderstorm WarningTSACherokee, Muskogee, Okmulgee, Wagoner62 min
Sep 18, 5:08 PM CDTSpecial Weather StatementTSAPushmataha52 min
Sep 18, 5:25 PM CDTSevere Thunderstorm WarningTSACherokee, Muskogee, Sequoyah, Wagoner65 min
Sep 18, 5:28 PM CDTSevere Thunderstorm WarningTSALeFlore, Sequoyah62 min
Sep 18, 5:33 PM CDTSevere Thunderstorm WarningTSALatimer, Pittsburg, Pushmataha57 min
Sep 18, 6:37 PM CDTSpecial Weather StatementTSALatimer, Pushmataha53 min
Sep 18, 6:56 PM CDTSpecial Weather StatementTSAHaskell49 min
Sep 18, 6:59 PM CDTAreal Flood AdvisoryTSAHaskell, Latimer, LeFlore, Pittsburg, Pushmataha, Sequoyah2 hr
Sep 18, 5:14 PM CDTSpecial Weather StatementTSABenton46 min
Sep 18, 6:11 PM CDTSpecial Weather StatementTSASebastian49 min

Nearby

Tornado Warnings in Oklahoma, 2011Tornado Warnings in Arkansas, 2011Every tornado warning in 2011Tornadoes in 2011

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.