Alert archive / Oklahoma / Mesoscale Discussions in 2012

Mesoscale Discussion 1996

September 26, 20124 counties in Oklahoma; Lipscomb County, Ochiltree County, Texas

The Storm Prediction Center issued this mesoscale discussion at Sep 26, 2012, 10:29 PM CDT for 4 counties in Oklahoma; Lipscomb County, Ochiltree County, Texas. It was in force for 61 min.

The area

The outline as issued.

The facts

Issued: Sep 26, 2012, 10:29 PM CDT (03:29 UTC)
Expired: Sep 26, 2012, 11:30 PM CDT
In force: 61 min
Issued by: the Storm Prediction Center

Counties Beaver County, OK, Ellis County, OK, Harper County, OK, Woodward County, OK, Lipscomb County, TX, Ochiltree County, TX

The radar

The Dodge City radar (KDDC), 148 km from the middle of the area, began a volume at 03:28 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

Dodge City, (KDDC), launched 00:00Z, 3.5 hours before the alert went out and 151 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: 534 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1678 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

803 
ACUS11 KWNS 270329
SWOMCD
SPC MCD 270329 
OKZ000-TXZ000-270430-

MESOSCALE DISCUSSION 1996
NWS STORM PREDICTION CENTER NORMAN OK
1029 PM CDT WED SEP 26 2012

AREAS AFFECTED...ERN OK/NERN TX PANHANDLES INTO NWRN OK

CONCERNING...SEVERE THUNDERSTORM WATCH 653...

VALID 270329Z - 270430Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 653
CONTINUES.

SUMMARY...STRONG TO SEVERE STORMS /PRODUCING HAIL AND STRONG WIND
GUSTS/ WILL PERSIST ACROSS THE ERN OK PANHANDLE AND NERN TX
PANHANDLE THROUGH 04-05Z.  AN ISOLATED THREAT FOR STRONGER STORMS
REMAINS POSSIBLE ACROSS NWRN OK AS STORMS DEVELOP IN THIS REGION AND
ALSO MOVE INTO THIS AREA FROM THE OK/TX PANHANDLES.  THE POTENTIAL
FOR SEVERE WEATHER WILL EXIST OVER NWRN OK /E OF WW 653/ BETWEEN
04-06Z...BUT THIS SHORT DURATION PRECLUDES THE NEED FOR A NEW WW.

DISCUSSION...REGIONAL RADAR IMAGERY SHOWED A COMPLEX OF STRONG TO
SEVERE STORMS PROGRESSING ESEWD ACROSS THE ERN OK PANHANDLE AND NERN
TX PANHANDLE WITHIN THE NERN PART OF WW 653.  THIS ACTIVITY APPEARS
TO BE ATTENDANT TO DEEP LAYER ASCENT ASSOCIATED WITH A MIDLEVEL
IMPULSE MOVING EWD THROUGH SWRN KS AND WITHIN THE EXIT REGION OF AN
80+ KT UPPER LEVEL JET ADVANCING INTO W TX AND WRN OK DURING THE
OVERNIGHT.  DESPITE STRONG EFFECTIVE BULK SHEAR /EXCEEDING 40 KT/
FOR STORM ORGANIZATION...A LARGE COMPLEX OF STORMS OVER WEST CENTRAL
INTO CENTRAL OK IS CONVECTIVELY OVERTURNING THE DOWNSTREAM AIR
MASS...AND THUS REDUCING THE AVAILABLE INSTABILITY OVER NWRN OK TO
SUSTAIN A SEVERE WEATHER THREAT AS THE PANHANDLE ACTIVITY MOVES E OF
WW 653.  

LAST SEVERAL RUNS OF THE WRF-HRRR HAVE INDICATED THE ONGOING STORMS
IN THE ERN OK/NERN TX PANHANDLES WILL PROGRESS ESEWD INTO NWRN
OK...WITH ADDITIONAL STORMS DEVELOPING IN ADVANCE OF THIS ACTIVITY
AND WNWWD FROM THE CENTRAL OK TSTM COMPLEX.

..PETERS.. 09/27/2012

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

ATTN...WFO...OUN...AMA...

LAT...LON   36990109 36989909 36679895 36029935 36000028 36000109
            36060138 36500115 36990109

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 26, 7:17 PM CDT	Mesoscale Discussion	SPC	Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 19 more	58 min
Sep 26, 8:08 PM CDT	Mesoscale Discussion	SPC	Creek, Haskell, Hughes, Latimer, LeFlore, Lincoln and 7 more	97 min
Sep 27, 3:09 PM CDT	Mesoscale Discussion	SPC	Cimarron	66 min
Sep 27, 5:59 PM CDT	Severe Thunderstorm Watch	SPC	Cimarron, Texas	7 hr
Sep 27, 2:17 PM CDT	Mesoscale Discussion	SPC	Brown, Callahan, Coke, Coleman, Comanche, Crane and 22 more	58 min

Nearby

Mesoscale Discussions in Oklahoma, 2012 Mesoscale Discussions in Texas, 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.