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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS65 KBOI 190831
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
231 AM MDT Mon Apr 19 2021

.SHORT TERM...Today through Wednesday night...A strong cold front
will cross our area from the north this morning, followed this
afternoon by northwest winds 15-30 mph bringing much cooler air
from western Canada. Strongest winds will be in the Snake River
Valley southeast of Boise, where gusts over 40 mph are possible.
So a wind advisory is in effect for southwest Idaho, from noon
today until 6 pm MDT this evening. The front will be dry except
for isolated showers east of McCall. Today will be 10-15 degrees
cooler than Sunday, which is actually near normal for mid April.
Winds will diminish this evening. With clear skies, temperatures
will drop below freezing tonight and Tuesday night in the
mountains, the Magic Valley, and most of eastern Oregon. A warming
trend will start on Wednesday as an upper-level high pressure
ridge approaches the coast.

.LONG TERM...Thursday through Monday...Thursday through Monday...An
upper trough moving through the northern Rockies on Thursday will
bring a chance of precipitation to the West Central Mountains on
Thursday, otherwise a dry northwesterly flow aloft will prevail as
an upper ridge resides near the coast. The ridge will slowly work
inland through Friday. A weak disturbance moving through the ID
panhandle may clip the West Central Mountains for a slight chance
of showers on Friday, otherwise expect dry conditions.
Temperatures both Thursday and Friday will be warm, with highs
around 5 to 10 degrees above normal. A pattern change looks more
certain over the weekend. The latest models are coming into better
agreement as the persistent ridge along the coast weakens and
shifts east and is replaced with an upper trough. Precipitation
may reach our area by Saturday, with a chance of precip continuing
through early next week. It has been a dry month so far, with
just a trace reported at the Boise Airport. Above-normal
temperatures over the weekend will cool to near normal on Monday.

&&

.AVIATION...VFR. Isolated showers east of KMYL. Surface winds:
generally northwest less than 12 kt, increasing to 15 to 25 kt after
15Z. Areas to the south and east of KBOI, winds increasing to 20 to
30 knots with gusts to around 40 kt after 18Z. Winds aloft at 10k
feet MSL: north to northwest 25-35 kt.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Wind Advisory from noon today to 6 PM MDT this evening
     IDZ014>016-029-030.
OR...None.

&&

$$

www.weather.gov/Boise
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SHORT TERM...JT
LONG TERM....BW
AVIATION.....BW