Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 2, NWS Tulsa, OK

February 20, 2012Osage County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Feb 20, 2012, 4:32 PM CST for Osage County, Oklahoma. It was in force for 28 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 20, 2012, 4:32 PM CST (22:32 UTC)
Expired: Feb 20, 2012, 5:00 PM CST
In force: 28 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

County Osage County, OK

The radar

The Wichita radar (KICT), 114 km from the middle of the area, began a volume at 22:31 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
Feb 20, 4:45 PM CST	TSTM WND GST 60	Grainola, OK	HAIL TO THE SIZE OF DIMES COVERED THE GROUND.

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
Feb 20, 2:50 PM CST	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 10.5 hours before the alert went out and 82 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 887 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 430 m²/s²
0-3 km storm-relative helicity: 464 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.

016 
WUUS54 KTSA 202232
SVRTSA
OKC113-202300-
/O.NEW.KTSA.SV.W.0002.120220T2232Z-120220T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
432 PM CST MON FEB 20 2012

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN OSAGE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 500 PM CST

* AT 427 PM CST...A SEVERE THUNDERSTORM WAS LOCATED 16 MILES
  SOUTHWEST OF GRAINOLA...MOVING NORTHEAST AT 65 MPH.

  STORM HAZARDS INCLUDE...
  QUARTER SIZE HAIL...
  WIND GUSTS TO 60 MPH...

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...GRAINOLA
  AND FORAKER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3701 9620 3700 9612 3673 9684 3675 9685
      3675 9683 3677 9682 3679 9676 3694 9676
      3701 9675
TIME...MOT...LOC 2232Z 237DEG 58KT 3686 9681

$$

1 follow-up statement

887 
WWUS54 KTSA 202256
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
456 PM CST MON FEB 20 2012

OKC113-202306-
/O.EXP.KTSA.SV.W.0002.000000T0000Z-120220T2300Z/
OSAGE OK-
456 PM CST MON FEB 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN OSAGE COUNTY EXPIRES
AT 500 PM CST...

THE THUNDERSTORM HAS MOVED OUT OF THE WARNED AREA...THEREFORE THE
SEVERE THUNDERSTORM WARNING WILL BE ALLOWED TO EXPIRE.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 10 PM CST!

LAT...LON 3701 9620 3700 9612 3673 9684 3675 9685
      3675 9683 3677 9682 3679 9676 3694 9676
      3701 9675
TIME...MOT...LOC 2256Z 237DEG 58KT 3707 9640

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 20, 4:02 AM CST	Wind Advisory	TSA	Adair, Cherokee, Craig, Creek, Delaware, McIntosh and 12 more	17 hr
Feb 20, 3:54 PM CST	Special Weather Statement	TSA	Creek, Okfuskee, Osage, Pawnee	66 min
Feb 20, 4:50 PM CST	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee, Osage, Pawnee, Tulsa	40 min
Feb 20, 4:55 PM CST	Special Weather Statement	TSA	Osage, Pawnee, Washington	50 min
Feb 20, 5:31 PM CST	Special Weather Statement	TSA	McIntosh, Okfuskee, Okmulgee, Rogers, Tulsa, Wagoner	59 min
Feb 20, 5:45 PM CST	Special Weather Statement	TSA	Craig, Nowata, Washington	45 min

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.