Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 191540

Area Forecast Discussion
National Weather Service Boise ID
940 AM MDT Tue Mar 19 2019

.DISCUSSION...No update to the forecast for today. Easterly winds
will increase through the day in response to a tightening surface
pressure gradient and winds aloft. High temperatures today will
be about 10 degrees above normal under clear skies.


.AVIATION...VFR with mostly clear skies. Surface winds east-
southeast 10 kts, increasing after 19/18Z to 15 to 20 kts. Winds
aloft near 10k ft MSL: east 10-15 kts, increasing after 19/18Z to
20 to 25 kts.


SHORT TERM...Today through Friday...An upper level ridge
centered over British Columbia will slowly move eastward into
Alberta by Wednesday and eastern MT by Thursday afternoon. This
will create a pressure gradient across eastern Oregon and in
Idaho from the Snake Basin south as a trough approaches the CA
coast. Expect east-southeast winds to increase this afternoon, and
last into Thursday. The strongest winds will be across the Snake
Plain and south in Idaho including the southern Boise and Owyhee
Mountains, and across southeast OR with the exception of Baker
County. Temperatures will be quite mild across area, around 10-15
degrees above normal today and Wednesday. A trough off the CA
coast will undercut the ridge on Wednesday afternoon as it moves
across the Great Basin on Thursday bringing increased clouds.
Winds will taper off on Thursday morning as the system passes to
the east. Showers will mainly be south along the Nevada border as
this system moves into UT by Friday morning.

LONG TERM...Friday night through Tuesday...The next upper trough
will move inland Friday night with showers spreading into the
area by Saturday. The showers will linger through Sunday, although
drier air will start to move into the area by late in the day as
the system pushes off to the east. Snow levels will be around 6500
feet Friday night and lower to around 4000 feet on Sunday. An
upper ridge will amplify across the region for dry conditions on
Monday. The ridge will start to shift east on Tuesday as another
Pacific trough spreads moisture inland. Showers may start to work
back into the area ahead of the system on Tuesday. Temperatures
will be near normal through the weekend and warm to above normal
levels Monday and Tuesday.





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