Alert archive / Oklahoma / Mesoscale Discussions in 2012

Mesoscale Discussion 619

April 29, 2012Labette County, Montgomery County, Kansas; 18 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2012, 1:53 AM CDT for Labette County, Montgomery County, Kansas; 18 counties in Oklahoma. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 29, 2012, 1:53 AM CDT (06:53 UTC)
Expired: Apr 29, 2012, 4:00 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Labette County, KS, Montgomery County, KS, Adair County, OK, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Kay County, OK, Mayes County, OK, Noble County, OK, Nowata County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 49 km from the middle of the area, began a volume at 06:56 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 nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 6.9 hours before the alert went out and 129 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: 167 J/kg
Mixed-layer CIN: -203 J/kg
Mixed-layer LCL: 868 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 228 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

707 
ACUS11 KWNS 290653
SWOMCD
SPC MCD 290653 
ARZ000-MOZ000-OKZ000-KSZ000-290900-

MESOSCALE DISCUSSION 0619
NWS STORM PREDICTION CENTER NORMAN OK
0153 AM CDT SUN APR 29 2012

AREAS AFFECTED...NERN OK

CONCERNING...SEVERE THUNDERSTORM WATCH 202...

VALID 290653Z - 290900Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 202
CONTINUES.

LATEST RADAR LOOP CONTINUES TO SHOWS ELEVATED SEVERE STORMS ACROSS
WRN PORTIONS OF WW 202 AND ADJACENT AREAS...NEAR AND JUST N OF THE
SURFACE FRONT LYING ENE-WSW ACROSS THIS AREA.  

WHILE STORMS ARE EXPECTED TO LINGER FOR SEVERAL HOURS...SEVERE
THREAT SHOULD GRADUALLY DIMINISH WITH TIME.  STILL...THREAT FOR
MAINLY LARGE HAIL WILL LIKELY PERSIST FOR AT LEAST A COUPLE MORE
HOURS WITH A COUPLE OF THE STRONGEST CELLS.

..GOSS.. 04/29/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...SGF...TSA...ICT...OUN...

LAT...LON   35649662 35869739 36889718 37279571 37089463 35619451
            35649662

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 29, 2:22 PM CDT	Mesoscale Discussion	SPC	Morton, Stanton	113 min
Apr 29, 5:10 PM CDT	Severe Thunderstorm Watch	SPC	Barber, Clark, Comanche, Edwards, Finney, Ford and 14 more	8 hr
Apr 29, 5:51 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 24 more	2 hr
Apr 28, 10:36 PM CDT	Tornado Watch	SPC	Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 11 more	3 hr
Apr 28, 10:54 PM CDT	Mesoscale Discussion	SPC	Caddo, Canadian, Cleveland, Comanche, Cotton, Grady and 4 more	2 hr
Apr 28, 11:52 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Cherokee, Craig, Creek, Delaware, McIntosh and 13 more	5 hr
Apr 29, 1:37 AM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Custer, Dewey, Garfield and 8 more	23 min
Apr 29, 3:13 AM CDT	Mesoscale Discussion	SPC	Beckham, Custer, Dewey, Roger Mills	92 min

Nearby

Mesoscale Discussions in Oklahoma, 2012 Mesoscale Discussions in Kansas, 2012 Every mesoscale discussion 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.