Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 231545

Area Forecast Discussion
National Weather Service Boise ID
945 AM MDT Tue May 23 2017

.DISCUSSION...Warm and dry conditions are expected to persist
today under an upper level ridge. Tomorrow`s temperatures will be
10 or more degrees cooler due to a dry cold front sweeping
through that is associated with an upper low passing to the north
of the area. The forecast is on track and there are no updates
needed at this time.


.AVIATION...VFR with mostly clear skies. Surface winds: Variable 10
kts or less. Winds aloft to 10k feet MSL: West 5-15 kts.


SHORT TERM...Today through Wednesday...Ridging over the area will
continue to bring dry and warm conditions today, along with light
wind. An area of low pressure will move east over British Columbia
this evening. As this system moves southeast through Wednesday, it
will send a mostly dry cold front south across the forecast area
on Wednesday. The front is expected to reach the northern border
of the forecast area Wednesday morning, and will generally have
moved south of the area by mid to late Wednesday afternoon. Though
this front is not anticipated to bring widespread shower
activity, it will produce periods of gusty wind, and cause a 10 to
20 degree drop in daytime temperatures. Models do hint at a bit
of moisture across the southern reaches of the forecast area,
which may result in some showers and thunderstorms along the
Nevada border on Wednesday afternoon.

LONG TERM...Wednesday night through Monday...With a shallow upper
level trough over the Intermountain Region Thursday and Friday,
there will be enough moisture and instability for showers and
isolated afternoon and evening thunderstorms, mainly over the higher
terrain. Cool air aloft and afternoon cloud cover will limit
heating, keeping daytime temperatures 5 to 10 degrees below normal.
Overnight lows will be a few degrees below normal. Showers are
expected to end Friday night as the trough retreats eastward and an
upper level ridge builds over the coast. As the ridge shifts east
over the weekend, it will bring mostly clear skies, and above normal
temperatures Sunday and Monday.





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