Cairo, Oregon Weather Forecast Discussion

138
FXUS65 KBOI 190247
AFDBOI
Area Forecast Discussion
National Weather Service Boise ID
847 PM MDT Thu Sep 18 2025
.DISCUSSION...
No significant weather across the forecast area as an upper
level ridge is in control. This evenings sounding shows very
dry air in the low and mid levels of the atmosphere with high
level moisture near 300mb showing as cirrus clouds spreading
over the area. Forecast looks on track. No updates this evening.
&&
.AVIATION...VFR. Increasing high clouds. Surface winds: variable
10kt or less overnight. Winds aloft at 10kft MSL: variable
5-15kt.
KBOI...VFR. Surface winds generally SE 5-10kt, becoming NW 5kt
Friday afternoon.
Weekend Outlook...Isolated showers and thunderstorms on
Saturday afternoon into Sunday. Gusty outflow winds up to 45kt
possible. Breezy west-northwest winds on Sunday afternoon behind
cold front.
&&
.PREV DISCUSSION...
SHORT TERM...Tonight through Saturday night...High pressure
remains over the area with warm temperatures today and Friday.
A low pressure system over southern CA will slowly move
northward into the Great Basin tonight. High level clouds will
stream northward into southeast OR and southwest ID late this
afternoon, with mostly cloudy skies into Saturday and Sunday.
Temperatures will be slightly cooler due to cloud cover, but
still around 5 degrees above normal. There is a 10-15% chance
of showers and afternoon thunderstorms along the Idaho-Nevada
border Friday. The shower and thunderstorm chances expand into
southeast Oregon and the higher terrain south of the Snake River
Plain Saturday evening. These showers and storms have the
potential to produce outflow wind gusts up to 50 mph.
LONG TERM...Sunday through Thursday...A cold frontal passage on
Sunday will increase shower and thunderstorm coverage across
east-central Oregon and the west-central Idaho mountains while
bringing gusty westerly winds to the region. Temperatures on
Monday lower to near normal. By Tuesday the ridge rebuilds over
the region with temperatures warming to around 10 degrees above
normal Tuesday and Wednesday. Forecast confidence beyond
Wednesday is low.
&&
.BOI WATCHES/WARNINGS/ADVISORIES...
ID...None.
OR...None.
&&
$$
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DISCUSSION...TL
AVIATION.....TL
SHORT TERM...KA
LONG TERM....KA

NWS BOI Office Area Forecast Discussion