Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 1017

June 1, 2012Jackson County, Oklahoma; 28 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 1, 2012, 9:15 PM CDT for Jackson County, Oklahoma; 28 counties in Texas. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Jun 1, 2012, 9:15 PM CDT (02:15 UTC)
Expired
Jun 1, 2012, 10:15 PM CDT
In force
60 min
Issued by
the Storm Prediction Center
All 29 counties

Jackson County, OK, Bailey County, TX, Baylor County, TX, Briscoe County, TX, Castro County, TX, Childress County, TX, Cochran County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Hale County, TX, Hall County, TX, Hardeman County, TX, Haskell County, TX, Hockley County, TX, Kent County, TX, King County, TX, Knox County, TX, Lamb County, TX, Lubbock County, TX, Motley County, TX, Parmer County, TX, Stonewall County, TX, Swisher County, TX, Throckmorton County, TX, Wilbarger County, TX

The radar

The Lubbock radar (KLBB), 125 km from the middle of the area, began a volume at 02:18 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

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.3 hours before the alert went out and 161 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-pSkew-T log-p diagram, Amarillo Airport, TX at 00:00Z on 2012-06-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1358 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 00:00Z on 2012-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 348 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1358 J/kg
Mixed-layer CIN
-240 J/kg
Mixed-layer LCL
1676 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
348 m²/s²
0-3 km storm-relative helicity
484 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.3

Open this sounding in Storm Lab

The text

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

003 
ACUS11 KWNS 020216
SWOMCD
SPC MCD 020215
TXZ000-OKZ000-020315-

MESOSCALE DISCUSSION 1017
NWS STORM PREDICTION CENTER NORMAN OK
0915 PM CDT FRI JUN 01 2012

AREAS AFFECTED...TX SOUTH PLAINS INTO WRN NORTH TX AND FAR SW OK

CONCERNING...SEVERE THUNDERSTORM WATCH 337...

VALID 020215Z - 020315Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 337
CONTINUES.

SUMMARY...THE OVERALL TREND IN STORM EVOLUTION HAS BEEN FOR GRADUAL
WEAKENING TO OCCUR AND THIS IS EXPECTED TO CONTINUE OVER THE NEXT
HOUR OR TWO. ISOLATED SEVERE WIND/HAIL THREAT MAY CONTINUE FOR A
SHORT WHILE BUT OVERALL SEVERE THREAT IS DECREASING.

DISCUSSION...OVERALL TREND THE LAST 30-45 MINUTES HAS BEEN FOR
STORMS TO WEAKEN AS THE BOUNDARY LAYER HAS BEGUN TO COOL AND
INHIBITION WAS INCREASING. ADDITIONALLY...0155Z IMAGERY SHOWED
SLIGHT WARMING OF CLOUD TOPS AND LOCAL WSR-88D MESH CORES HAD
DECREASED. MARGINALLY SEVERE WIND GUSTS AND HAIL MAY STILL BE
POSSIBLE OVER THE NEXT HOUR OR SO AS LOW LEVEL LAPSE RATES REMAIN
STEEP BUT AS SFC COOLING CONTINUES DAMAGING WIND THREAT WILL
DECREASE. EFFECTIVE SHEAR ALSO DROPS OFF MARKEDLY ACROSS SOUTHEAST
PORTIONS OF THE WATCH...FURTHER LENDING SUPPORT FOR CONTINUED
WEAKENING TREND. ACROSS WESTERN PORTIONS OF THE WATCH AREA SHEAR
REMAINS STRONG AND STORMS MAY TRY TO MAINTAIN MARGINALLY SEVERE
CHARACTERISTICS A WHILE LONGER. OVERALL...SEVERE THREAT APPEARS TO
BE DIMINISHING.

..LEITMAN.. 06/02/2012

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

ATTN...WFO...FWD...OUN...SJT...LUB...MAF...

LAT...LON   34710299 34709999 34529999 34499968 34719965 34799918
            34209916 34169894 32899891 32920153 33360153 33330301
            34710299

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 2, 2:38 PM CDTMesoscale DiscussionSPCCimarron97 min
Jun 2, 3:33 PM CDTSevere Thunderstorm WatchSPCCimarron, Texas7 hr
Jun 2, 5:57 PM CDTMesoscale DiscussionSPCCimarron, Texas2 hr

Nearby

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.