SPC MD 660



MD 0660 CONCERNING SEVERE THUNDERSTORM WATCH 173… FOR PORTIONS OF THE PECOS/CONCHO VALLEYS OF TEXAS

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Mesoscale Discussion 0660
NWS Storm Prediction Center Norman OK
0920 PM CDT Fri May 17 2019

Areas affected...portions of the Pecos/Concho Valleys of Texas

Concerning...Severe Thunderstorm Watch 173...

Valid 180220Z - 180345Z

The severe weather threat for Severe Thunderstorm Watch 173
continues.

SUMMARY...Severe risk has gradually decreased in the short term, as
storms coverage diminishes.

DISCUSSION...Latest radar loop shows that convection continues to
decrease in both coverage and intensity in/near WW 173.  At this
time, only one robust storm remains, and it too has shown signs of
weakening over the past half hour to hour.

While some increase in the south-southeasterly low-level jet has
been noted recently, gradual diurnal cooling of the boundary layer
-- and thus a re-establishment of capping -- appears to be
prevailing at this time, with respect to the existing storms.  With
that said, additional/new storm development -- and
possible/accompanying severe potential -- remains possible as warm
advection increases over the next couple of hours (and as hinted at
by a lone cell recently initiating south of LBB on the retreating
dryline).  We will continue to monitor convective evolution this
evening, and any need for additional WW issuance.

..Goss.. 05/18/2019

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...EWX...SJT...MAF...

LAT...LON   29500129 30160241 30880244 31410186 31720108 31340048
            30800023 29720098 29500129 

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