233
FXUS65 KBOI 302013
AFDBOI

Area Forecast Discussion
National Weather Service Boise ID
213 PM MDT Mon Jun 30 2025

.SHORT TERM...Tonight through Wednesday night...An upper level
trough remains off the CA coast with unusual isolated
thunderstorms over the marine layer continuing this afternoon.
This system is bringing mid level moisture and smoke to the area
from the south. A 10-20 percent chance of thunderstorms is
forecast this afternoon along the NV border and south central
OR, where cumulus clouds are beginning to form this afternoon.
Gusty outflow winds up to 45 mph possible with the storms this
afternoon along the NV border and western Harney County.
Isolated showers and thunderstorms continue into Tuesday
morning, mainly over eastern OR with sprinkles possible over
southwest Idaho. A dry slot with the system moves into
southeast OR and southwest ID by Tuesday afternoon, limiting
thunderstorm threat, and allowing warmer air. Temperatures will
be in the low 100s in the Treasure Valley and Weiser River Basin
on Tuesday where a Heat Advisory remains in effect. A shortwave
moves into the Pacific NW on Wednesday, bringing a weak cold
front, and a 20-30 percent chance of showers and storms. Main
threats with the front will be gusty winds and gusty erratic
outflow winds from thunderstorms up to 50 mph.

.LONG TERM...Thursday through Monday...Forecast confidence
beyond Thursday is low. But the models bring in shortwaves at
different times during the Thursday to Friday window keeping a
threat of showers and thunderstorms over the area through
Saturday. With those systems, temperatures lower to near normal
by Friday and continue through Sunday before warming 5-10
degrees by Monday. Gusty outflow winds will be the main threats
with the thunderstorms.

&&

.AVIATION...Mainly VFR. Isolated showers and thunderstorms late
this afternoon and early evening near the NV border with gusts
up to 40 kt. High density altitude due to heat. Additional
isolated showers and thunderstorms on Tuesday across SE Oregon
and higher terrain of SW Idaho. Surface winds: NW-NE 5-15 kt.
Winds aloft at 10kft MSL:
variable 10 kt or less, becoming E-S 10-20 kt by 06Z/Tue.

KBOI...VFR. High density altitude due to heat. Surface winds: NW
5-10 kt, becoming variable less than 8 kt by mid evening.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...Heat Advisory from 11 AM to 8 PM MDT Tuesday IDZ012-014-033.
OR...Heat Advisory from 11 AM MDT /10 AM PDT/ to 8 PM MDT /7 PM
     PDT/ Tuesday ORZ064.

&&

$$

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SHORT TERM...KA
LONG TERM....KA
AVIATION.....ST