Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 222049

Area Forecast Discussion
National Weather Service Boise ID
249 PM MDT Mon May 22 2017

.SHORT TERM...Tonight through Wednesday...Upper level ridge
continues to build over the region through tomorrow, with warm and
dry conditions expected. By late Tuesday evening, a deep upper
level low will begin its descent south out of the Gulf of Alaska.
The low`s associated cold front will begin moving through the
region north to south by day-break Wednesday, exiting south across
the Nevada border in the evening. Main impacts will be a 15
degree drop between Tuesday`s and Wednesday`s high temperatures
and gusty northwest winds. A substantial dry slot will follow
along and behind the cold front, so main threat of showers and
isolated thunderstorms will be found along the the Nevada border.

.LONG TERM...Wednesday night through Monday...Upper level trough
over Manitoba will bring northerly flow and unsettled weather across
the Idaho mountain zones Thursday and Friday afternoon. Temperatures
will be around 5 degrees below normal for Thursday under the cool
northerly flow aloft. Upper level ridging builds in from the west
starting on Friday, bringing warmer temperatures through the
weekend. Temperatures warm to around 10 degrees above normal by
Monday. As the ridge continues to build, afternoon heating and
instability will be sufficient enough to produce thunderstorms on
Monday and Tuesday afternoons, especially over the higher terrain.


.AVIATION...VFR. Mostly clear. NW winds up to 10kt up through





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