SPC MD 556

MD 0556 CONCERNING SEVERE THUNDERSTORM WATCH 159... FOR PORTIONS OF WESTERN MISSOURI...FAR SOUTHEASTERN KANSAS...FAR NORTHEASTERN OKLAHOMA...AND FAR NORTHWESTERN ARKANSAS

Mesoscale Discussion 0556
NWS Storm Prediction Center Norman OK
1051 PM CDT Tue Apr 25 2017

Areas affected...Portions of western Missouri...far southeastern
Kansas...far northeastern Oklahoma...and far northwestern Arkansas

Concerning...Severe Thunderstorm Watch 159...

Valid 260351Z - 260445Z

The severe weather threat for Severe Thunderstorm Watch 159
continues.

SUMMARY...Strong to occasionally severe storms may persist eastward
beyond Watch 159. Areal expansion or new watch issuance may be
needed.

DISCUSSION...A pair of small linear segments has evolved from
eastern Kansas into far western Missouri this evening, aided by
broad large-scale ascent on the eastern fringe of a mid-level
trough. While diurnal cooling has reduced surface-based buoyancy
some, surface temperatures in the upper 60s/lower 70s and modest
low-level moisture are maintaining MLCAPE values around 500-1000
J/kg. Combined with ample south/southwesterly mid-level flow of
50-60 kt, this thermodynamic environment may support a continued
damaging wind threat beyond the eastern edge of the ongoing watch.
As such, areal expansion or new watch issuance could be needed
within the next 30 minutes or so.

..Picca.. 04/26/2017

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

ATTN...WFO...LZK...SGF...EAX...TSA...ICT...

LAT...LON   38359462 38529421 38529311 38399262 37989251 37209262
            36349287 35919351 35989441 36239530 36909523 37699492
            38359462 

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