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ACUS11 KWNS 092253
SWOMCD
SPC MCD 092253
MTZ000-IDZ000-100030-
Mesoscale Discussion 0686
NWS Storm Prediction Center Norman OK
0553 PM CDT Sat Jun 09 2018
Areas affected...portions of western MT
Concerning...Severe Thunderstorm Watch 166...
Valid 092253Z - 100030Z
The severe weather threat for Severe Thunderstorm Watch 166
continues.
SUMMARY...An isolated severe threat will persist across eastern
portions of WW 166 over the next few hours.
DISCUSSION...Overall convective trends have been on the decrease
recently. This is likely due in part to widespread cloud cover and
rainfall across western portions of WW 166. Surface dewpoints across
portions of southwestern/western MT, including BTM, HLN, and BZN,
are in the upper 20s to low 30s F. This moisture-starved air is
evident in weakening CAPE fields and skeletal reflectivity
structures. Further north, better moisture is apparent from GTF to
HVR where dewpoints in the upper 40s are present and low level flow
remains from the south/southeast. This slightly better airmass could
allow for an isolated severe threat to persist the next few hours
with any storm that develops and/or moves into eastern portions of
the watch area, but the threat across western portions of WW 166
will continue to quickly diminish.
..Leitman.. 06/09/2018
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...BYZ...TFX...MSO...
LAT...LON 49001466 48950952 47750967 46680994 46171022 45871063
45881450 49001466
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