Alert archive / Texas / Mesoscale Discussions in 2012
Mesoscale Discussion 91
The Storm Prediction Center issued this mesoscale discussion at Feb 2, 2012, 3:44 PM CST for 7 counties in Oklahoma; 28 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 2, 2012, 3:44 PM CST (21:44 UTC)
- Expired
- Feb 2, 2012, 5:45 PM CST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 35 counties
Beckham County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Roger Mills County, OK, Tillman County, OK, Armstrong County, TX, Borden County, TX, Briscoe County, TX, Childress County, TX, Collingsworth County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Donley County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Gray County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Hemphill County, TX, Kent County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Lynn County, TX, Motley County, TX, Scurry County, TX, Stonewall County, TX, Swisher County, TX, Wheeler County, TX, Wilbarger County, TX
The radar
The Altus AFB radar (KFDR), 136 km from the middle of the area, began a volume at 21:48 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Amarillo Airport, TX (KAMA), launched 12:00Z, 9.7 hours before the alert went out and 143 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1826 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
750
ACUS11 KWNS 022144
SWOMCD
SPC MCD 022144
OKZ000-TXZ000-022345-
MESOSCALE DISCUSSION 0091
NWS STORM PREDICTION CENTER NORMAN OK
0344 PM CST THU FEB 02 2012
AREAS AFFECTED...NRN PORTIONS OF WRN TX THROUGH TX PANHANDLE AND WRN
OK
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 022144Z - 022345Z
THUNDERSTORMS ARE EXPECTED TO DEVELOP FARTHER SWD OVER PORTIONS OF
THE TX PANHANDLE BY 00-01Z AND EVENTUALLY INTO WRN OK THIS EVENING.
INITIAL PRIMARY THREAT WILL BE SUPERCELLS WITH ISOLATED LARGE HAIL.
HOWEVER...A WINDOW WILL EXIST DURING THE EARLY EVENING FOR ISOLATED
TORNADOES FROM THE SRN TX PANHANDLE INTO NWRN TX AND SWRN OK. AREA
WILL CONTINUE TO BE MONITORED FOR A POSSIBLE WW BY 23-00Z.
WV AND OBJECTIVE ANALYSIS DATA SHOW AN UPPER JET STREAK FROM SRN AZ
THROUGH SRN AND ERN NM WITHIN BASE OF TROUGH SITUATED OVER THE CNTRL
AND SRN ROCKIES. MID-UPPER ASCENT WITHIN THE EXIT REGION OF THIS
FEATURE AND WITHIN STEEP LAPSE RATE ENVIRONMENT IS PROMOTING
DEVELOPMENT OF ELEVATED CONVECTION FROM NERN MN INTO THE TX AND OK
PANHANDLES. THIS AREA REMAINS WELL NORTH OF GREATER MOISTURE AND
INSTABILITY ACROSS W-CNTRL AND WRN TX...AND AS A RESULT IS EXPECTED
TO REMAIN BELOW SEVERE LEVELS NEXT COUPLE HOURS.
LLJ IS STRENGTHENING OVER WRN TX WITHIN UPPER JET EXIT REGION AND IS
CONTRIBUTING TO MOISTURE ADVECTION AND NWD DESTABILIZATION. STORMS
SHOULD INCREASE IN COVERAGE AND INTENSIFY THIS EVENING FROM PORTIONS
OF THE TX PANHANDLE...NWRN TX AND WRN OK AS THE ATMOSPHERE
DESTABILIZES NWD WITH TIME. STRONG VERTICAL SHEAR PROFILES WITH
LARGE 0-2 KM HODOGRAPHS WILL SUPPORT A FEW SUPERCELLS...BUT SOME OF
THE ACTIVITY MAY EVOLVE INTO LINE/BOWING SEGMENTS. A WINDOW MAY
EXIST FOR ISOLATED TORNADOES AS STORMS DEVELOP ON NRN FRINGE OF
GREATER MOISTURE RETURN AND BEFORE ONSET OF NOCTURNAL COOLING.
OTHERWISE...ISOLATED LARGE HAIL AND DAMAGING WIND WILL BE THE MAIN
THREATS.
..DIAL.. 02/02/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...SJT...LUB...AMA...MAF...
LAT...LON 35660102 35940010 35789943 35109895 34409890 33739923
33040014 32580115 32720180 33880201 35030165 35660102Nearby
Mesoscale Discussions in Texas, 2012Mesoscale Discussions in Oklahoma, 2012Every 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.