Mesoscale Discussion 0584
NWS Storm Prediction Center Norman OK
1049 PM CDT Fri Apr 28 2017
Areas affected...Portions of northern/western AR
Concerning...Severe Thunderstorm Watch 172...
Valid 290349Z - 290445Z
The severe weather threat for Severe Thunderstorm Watch 172
continues.
SUMMARY...A small part of northern/western AR is being monitored for
possible Tornado Watch issuance.
DISCUSSION...A small part of Watch 172 and vicinity is being
considered for possible Tornado Watch issuance. A supercell
approaching the Fort Smith area has shown signs of possible tornado
development. This activity is ingesting near-surface-based inflow
along a frontal zone extending eastward across parts of northern AR.
The air mass south of this boundary is very moist, supporting
2000-3000 J/kg MLCAPE. Long/looping hodographs could support
conditional tornado potential if discrete supercell structures were
to be maintained along the frontal zone. There is uncertainty
regarding this notion -- especially given some potential for storm
motion to be slightly directed to the north of the boundary --
though some tornado risk may exist during the next few hours.
..Cohen/Thompson.. 04/29/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LZK...TSA...
LAT...LON 35259418 35729357 36019271 36059221 35549217 35089362
35259418
Read morefrom SPC Forecast Products http://ift.tt/JwT5sF
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