Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 48, NWS Tulsa, OK

April 15, 20127 counties in Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 15, 2012, 5:30 AM CDT for 7 counties in Oklahoma. It was in force for 60 min. 5 reports 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: Apr 15, 2012, 5:30 AM CDT (10:30 UTC)
Expired: Apr 15, 2012, 6:30 AM CDT
In force: 60 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Creek County, OK, Nowata County, OK, Osage County, OK, Pawnee County, OK, Rogers County, OK, Tulsa County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 64 km from the middle of the area, began a volume at 10:31 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
Apr 15, 5:49 AM CDT	TORNADO	4 Sw Skiatook, OK	NWS STORM SURVEY FOUND TORNADO DAMAGE THAT BEGAN 4.8 MILES SOUTHWEST OF SKIATOOK AND ENDED JUST NORTHEAST OF THE SKIATOOK MUNICIPAL AIRPORT. RATING WAS EF-1 BASED ON TREE DAMAGE WITHIN THE 4 MILE LONG PATH.
Apr 15, 5:54 AM CDT	TSTM WND GST 65	2 Ene Copan, OK	OKLAHOMA MESONET
Apr 15, 5:55 AM CDT	TSTM WND DMG	1 Ssw Skiatook, OK	UNKNOWN DAMAGE AT THE AIRPORT. PROBABLE TORNADO. RELAYED BY KOTV. TIME ESTIMATED VIA RADAR.
Apr 15, 5:56 AM CDT	HAIL 1	Sand Springs, OK
Apr 15, 6:02 AM CDT	TSTM WND GST 65	Collinsville, OK

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

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 15, 1:37 AM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 10.5 hours before the alert went out and 146 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: 2195 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 863 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 335 m²/s²
0-3 km storm-relative helicity: 436 m²/s²
Significant tornado parameter: 5.9
Supercell composite: 19.0

Open this sounding in Storm Lab

The text

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

477 
WUUS54 KTSA 151030
SVRTSA
OKC037-105-113-117-131-143-147-151130-
/O.NEW.KTSA.SV.W.0048.120415T1030Z-120415T1130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
530 AM CDT SUN APR 15 2012

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CREEK COUNTY IN NORTHEAST OKLAHOMA
  NOWATA COUNTY IN NORTHEAST OKLAHOMA
  EASTERN OSAGE COUNTY IN NORTHEAST OKLAHOMA
  EASTERN PAWNEE COUNTY IN NORTHEAST OKLAHOMA
  NORTHERN ROGERS COUNTY IN NORTHEAST OKLAHOMA
  NORTHERN TULSA COUNTY IN NORTHEAST OKLAHOMA
  WASHINGTON COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 630 AM CDT

* AT 527 AM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 6 MILES WEST OF HULAH TO 16 MILES SOUTH OF
  MANNFORD...MOVING NORTHEAST AT 65 MPH.

  STORM HAZARDS INCLUDE...
  WIND GUSTS TO 60 MPH...

* SOME LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  OKESA...KEYSTONE STATE PARK...BARNSDALL...HULAH...AVANT...
  BARTLESVILLE...COPAN...SAND SPRINGS...DEWEY...OCHELATA...
  SKIATOOK...SPERRY...RAMONA...TULSA...WANN...VERA...OWASSO...
  COLLINSVILLE...SOUTH COFFEYVILLE...LENAPAH...DELAWARE...TALALA...
  OOLOGAH...NOWATA...WATOVA...FOYIL...NEW ALLUWE AND CHELSEA.

THIS INCLUDES INTERSTATE 44 BETWEEN MILE MARKERS 187 AND 219.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

PEOPLE OUTSIDE SHOULD MOVE TO A SAFE SHELTER...PREFERABLY INSIDE A
STRONG BUILDING. STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.

&&

LAT...LON 3698 9543 3647 9544 3578 9647 3699 9618
      3701 9614
TIME...MOT...LOC 1030Z 227DEG 56KT 3697 9610 3594 9635

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 12:40 AM CDT	Wind Advisory	TSA	Creek, Okfuskee, Okmulgee, Pawnee, Tulsa, Washington	3 hr
Apr 15, 3:41 AM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	64 min
Apr 15, 4:43 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee	62 min
Apr 15, 5:05 AM CDT	Special Weather Statement	TSA	Creek	55 min
Apr 15, 5:47 AM CDT	Special Weather Statement	TSA	Okfuskee, Okmulgee, Rogers, Tulsa	58 min
Apr 15, 5:51 AM CDT	Tornado Warning	TSA	Nowata, Osage, Rogers, Tulsa, Washington	24 min
Apr 15, 6:22 AM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes, Nowata, Ottawa, Rogers	53 min
Apr 15, 6:41 AM CDT	Special Weather Statement	TSA	Mayes, Okmulgee, Wagoner	64 min
Apr 15, 6:43 AM CDT	Special Weather Statement	TSA	McIntosh, Pittsburg	62 min
Apr 15, 7:41 AM CDT	Special Weather Statement	TSA	Delaware	34 min
Apr 15, 7:44 AM CDT	Special Weather Statement	TSA	McIntosh, Muskogee, Pittsburg, Wagoner	31 min
Apr 15, 8:13 AM CDT	Special Weather Statement	TSA	Cherokee, Delaware, Muskogee	62 min
Apr 15, 8:14 AM CDT	Special Weather Statement	TSA	Haskell, Latimer, Pittsburg, Pushmataha, Sequoyah	61 min
Apr 15, 9:13 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Muskogee	62 min
Apr 15, 9:16 AM CDT	Tornado Warning	TSA	Adair, Cherokee	29 min
Apr 15, 9:42 AM CDT	Tornado Warning	TSA	Adair	33 min
Apr 15, 11:28 AM CDT	Special Weather Statement	TSA	LeFlore	62 min
Apr 15, 12:42 PM CDT	River Flood Warning	TSA	Rogers, Tulsa	7 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2012 Every severe thunderstorm warning in 2012

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.