FXUS65 KBOI 201815

AFDBOI



Area Forecast Discussion

National Weather Service Boise ID

1215 PM MDT Sat Jun 20 2026



.UPDATE...Updated aviation discussion.



&&



.KEY MESSAGES...

- Scattered showers today with scattered thunderstorms 

  developing this afternoon.



- Daytime temperatures cooling to 5 degrees above normal through

  Sunday, then hotter and drier Monday through Wednesday with

  temperatures around 10 to 15 degrees above normal.



&&



.SHORT TERM /Through Monday Night/...

Issued 401 AM MDT SAT JUN 20 2026

A weak system is moving northeastward over the Great Basin into

southwest MT this afternoon. Scattered showers moving over the

area today with light rain showers this morning. As the system 

moves northeast, partial clearing will lead to destabilization 

this afternoon, with scattered thunderstorms developing during 

the afternoon. Breezy west-northwest winds this afternoon, 

strongest in the Magic Valley. Drier air moves into the area on 

Sunday with afternoon west-northwest breezes. A ridge 

strengthens over the area on Monday with warmer temperatures. 

Temperatures will be around 5 degrees above normal through 

Sunday before a slight warming trend Monday.



&&



.LONG TERM /Tuesday through Saturday/...

Issued 401 AM MDT SAT JUN 20 2026

A ridge will strengthen and remain over the area through at 

least Wednesday. Temperatures will be 10 to 15 degrees above 

normal with values 95-100F in the lowest valleys Tuesday and 

Wednesday. Near record highs possible on Wednesday afternoon, 

with BOI forecast of 98F tying the record of 98F set in 1992. 

Models indicate an upper level trough moving into the Pacific 

Northwest sometime between Thursday and Saturday. This system

will bring much cooler temperatures and unsettled conditions by

Friday and Saturday.



&&



.AVIATION /18Z Saturday through Sunday/...

Issued 1117 AM MDT SAT JUN 20 2026



VFR. Rain showers in the central ID mountains today, with 

scattered thunderstorms developing over the NV border and near 

KTWF this evening. Outflow winds up to 40 kt, brief heavy rain,

and lightning are the main hazards. Mountain obscuration in 

mountain showers. Clearing skies overnight. Surface winds: 

W-NW 5-15 kt with gusts to 25 kt. Winds aloft at 10kft: W-NW

10-20 kt. 



KBOI...VFR. Mountains obscured NE of terminal in precipitation.

Showers ending in the early afternoon. Surface winds: NW 5-15kt

then variable less than 10 kt .



Sunday Outlook...VFR and clearing skies Sunday morning, with 

breezy W-NW winds Sunday afternoon.



&&



.BOI WATCHES/WARNINGS/ADVISORIES...

ID...Red Flag Warning until 6 PM MDT this evening for IDZ423-426.

OR...Red Flag Warning until 5 PM PDT this afternoon for ORZ670-672.

&&



$$



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AVIATION.....SA

SHORT TERM...KA

LONG TERM....KA