Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 231522
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
922 AM MDT Mon Apr 23 2018

.DISCUSSION...Latest stability charts suggest isolated thunderstorms
for eastern-most zones in Idaho this afternoon, i.e., Camas Prairie
and nearby, so will update for that.  Otherwise current forecast is
on track showing warming trend through Thursday under upper ridge.
Also, breezy to locally windy this afternoon in the Upper Treasure
and Western Magic Valleys, already in the forecast.

&&

.AVIATION...VFR. Isolated showers and thunderstorms across the
central Idaho and Boise Mountains this afternoon/evening, mainly
east of KMYL and Idaho City. Snow levels will be above 6 kft MSL.
Otherwise mostly clear skies. Surface winds: north-northwest 5-15
kts, except 10-20 kts with gusts to 30 kts along the I-84 corridor
through 03Z. Winds aloft near 10 kft MSL: northwest 10-20 kts,
becoming light and variable after 03Z.

&&

.PREV DISCUSSION...
SHORT TERM...Today through Tuesday...An amplifying upper ridge
along the Pacific NW coast will keep most of the area dry through
Tuesday. Flow around an exiting upper low will support a chance
of showers across the central Idaho mountains through this
afternoon, east of a line from Yellow Pine to Fairfield. Similar
to yesterday, much of the area will see gusty northwest winds
today. Breezy conditions will continue into Tuesday but shift to
an easterly direction as a surface high strengthens over MT.
Temperatures are near normal today, warming to 5-8 degrees above
normal on Tuesday.

LONG TERM...Tuesday night through Sunday...An upper level high
pressure ridge will keep temperatures well above normal through
Friday. Thursday and Friday will be the warmest days, with highs
around 15 degrees above normal. For later in the week, models have
been showing an upper level low pressure system moving onshore and
initiating isolated showers and thunderstorms mainly over the
higher terrain as early as Thursday night in southeast Oregon and
across the rest of our area Friday and Friday night. Models
solutions diverge over the weekend into early next week, but there
will be continuing support for isolated to scattered showers
Saturday through Monday. Temperatures will be cooler but still 5
to 10 degrees above normal Saturday and Sunday, then near normal
on Monday.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.

&&

$$

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DISCUSSION...LC
AVIATION.....AB
PREV SHORT TERM...DG
PREV LONG TERM....JT



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