Alert archive / Oklahoma / Tornado Warnings in 2013

Tornado Warning 8, NWS Tulsa, OK

April 18, 2013Adair County, Cherokee County, Delaware County, Oklahoma

NWS Tulsa, OK issued this tornado warning at Apr 18, 2013, 1:53 AM CDT for Adair County, Cherokee County, Delaware County, Oklahoma. It was in force for 37 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, 2013, 1:53 AM CDT (06:53 UTC)
Expired: Apr 18, 2013, 2:30 AM CDT
In force: 37 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Adair County, OK, Cherokee County, OK, Delaware County, OK

The radar

The Tulsa radar (KINX), 75 km from the middle of the area, began a volume at 06:54 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 17, 10:47 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 6.9 hours before the alert went out and 118 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: 1964 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 1350 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 291 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 9.2

Open this sounding in Storm Lab

The text

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

881 
WFUS54 KTSA 180653
TORTSA
OKC001-021-041-180730-
/O.NEW.KTSA.TO.W.0008.130418T0653Z-130418T0730Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
153 AM CDT THU APR 18 2013

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN CHEROKEE COUNTY IN EAST CENTRAL OKLAHOMA...
  NORTHWESTERN ADAIR COUNTY IN NORTHEAST OKLAHOMA...
  SOUTHEASTERN DELAWARE COUNTY IN NORTHEAST OKLAHOMA...

* UNTIL 230 AM CDT

* AT 150 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 3 MILES WEST OF SCRAPER...MOVING NORTHEAST AT
  40 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...OAKS...
  KANSAS...WATTS AND WEST SILOAM SPRINGS.

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 3629 9459 3610 9455 3597 9493 3613 9501
TIME...MOT...LOC 0654Z 247DEG 36KT 3609 9486

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 7:22 PM CDT	Special Weather Statement	TSA	Delaware	53 min
Apr 17, 8:42 PM CDT	Special Weather Statement	TSA	Delaware	33 min
Apr 17, 9:02 PM CDT	Special Weather Statement	TSA	Pawnee	43 min
Apr 17, 9:38 PM CDT	Special Weather Statement	TSA	Creek, Osage, Washington	52 min
Apr 17, 10:09 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee, Tulsa	51 min
Apr 17, 10:35 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee, Rogers, Tulsa, Washington	55 min
Apr 17, 10:46 PM CDT	Special Weather Statement	TSA	Craig, Nowata	44 min
Apr 17, 11:00 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee, Tulsa	60 min
Apr 17, 11:12 PM CDT	Tornado Warning	TSA	Creek, Okmulgee	33 min
Apr 17, 11:44 PM CDT	Tornado Warning	TSA	Creek, Okmulgee, Rogers, Tulsa, Wagoner	31 min
Apr 17, 11:53 PM CDT	Severe Thunderstorm Warning	TSA	Mayes, Muskogee, Okmulgee, Rogers, Tulsa, Wagoner	52 min
Apr 18, 12:17 AM CDT	Flash Flood Warning	TSA	Creek, Muskogee, Okfuskee, Okmulgee, Rogers, Tulsa and 1 more	4 hr
Apr 18, 12:17 AM CDT	Tornado Warning	TSA	Mayes, Rogers, Tulsa, Wagoner	28 min
Apr 18, 12:38 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware, Mayes, Muskogee, Okmulgee and 2 more	67 min
Apr 18, 12:46 AM CDT	Tornado Warning	TSA	Delaware, Mayes	29 min
Apr 18, 1:00 AM CDT	Flash Flood Warning	TSA	Cherokee, Craig, Delaware, Mayes, Muskogee, Ottawa and 2 more	4 hr
Apr 18, 1:16 AM CDT	Tornado Warning	TSA	Delaware, Mayes, Ottawa	44 min
Apr 18, 2:19 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Delaware	56 min
Apr 18, 2:39 AM CDT	Tornado Warning	TSA	Adair, Cherokee, Delaware	51 min
Apr 18, 2:46 AM CDT	Special Weather Statement	TSA	McIntosh, Muskogee, Okmulgee, Wagoner	44 min
Apr 18, 3:11 AM CDT	Severe Thunderstorm Warning	TSA	Cherokee, McIntosh, Muskogee, Okmulgee, Wagoner	64 min
Apr 18, 3:16 AM CDT	Flash Flood Warning	TSA	Adair, Cherokee, Delaware, Ottawa	4 hr
Apr 18, 4:28 AM CDT	Areal Flood Warning	TSA	Creek, Muskogee, Okfuskee, Okmulgee, Tulsa, Wagoner	14 hr
Apr 18, 4:55 AM CDT	Areal Flood Warning	TSA	Cherokee, Delaware, Mayes, Muskogee, Rogers, Wagoner	14 hr
Apr 18, 7:15 AM CDT	Areal Flood Warning	TSA	Adair, Cherokee, Delaware	12 hr
Apr 18, 8:23 AM CDT	River Flood Warning	TSA	Cherokee, Delaware	8 hr
Apr 18, 8:37 AM CDT	River Flood Warning	TSA	Okmulgee	4 days
Apr 18, 9:08 AM CDT	River Flood Warning	TSA	Cherokee	48 hr
Apr 18, 11:58 AM CDT	River Flood Warning	TSA	Adair	30 hr
Apr 18, 3:30 PM CDT	Freeze Warning	TSA	Craig, Creek, Nowata, Pawnee, Rogers, Tulsa and 1 more	17 hr

Nearby

Tornado Warnings in Oklahoma, 2013 Every tornado warning in 2013 Tornadoes in 2013

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.