textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- A cold front today will bring very gusty winds, blowing dust, and thunderstorms through this evening.

- Just above normal temps through Friday before another cooldown this weekend, conditions stay dry and breezy.

- Another round of precipitation this weekend with lower snow levels will bring snow to higher elevations.

SHORT TERM /Through Friday Night/

Issued 227 PM MDT WED MAY 13 2026 The ongoing cold frontal passage has brought very gusty winds to the forecast area today. Wind gusts 40-60 mph in open areas, and 20-30 mph in sheltered valleys are widespread, thus a wind advisory has been issued to highlight the areas with the strongest winds. The wind has also kicked up dust from dry lakebeds, playas, and dry agricultural areas. Visibility has been reduced as low as 1 mile near the dust sources, while most of the area sees a general haziness. As the front moves eastward, a few more hours of storms are possible in the Magic Valley before precipitation moves out of the area. Gusts up to 60 mph and lightning are possible in storms. However, the dry atmosphere will limit precipitation rates. The weather will taper off tonight, with the Wind Advisory set to expire on the Idaho side around midnight.

Thursday and Friday conditions remain dry and breezy and tight zonal flow sets in aloft. Behind the cold front, temps drop to just above normal for this time of year. Afternoon minimum relative humidities stay very low, and the dryness increases the diurnal temperature spread to bring morning lows down to 5 degrees below normal.

LONG TERM /Saturday through Wednesday/

Issued 227 PM MDT WED MAY 13 2026 A large trough will move on shore and across the Pacific Northwest and Northern Rockies this weekend. This will bring a significant cooling trend that will drop daytime temperatures to 10-15 degrees below normal by Sunday along with breezy to windy conditions in northwest flow. Not much precipitation is expected from this system. Saturday night and Sunday probability of precipitation is around a 30-50 percent over the northernmost mountain areas of our forecast area, including McCall, and about 20-30 percent for high terrain across the south. Snow levels will lower to about 4000-5000 feet. From Monday through Wednesday of next week, our area will mostly stay under a dry west-northwest flow with temperatures trending up to near seasonal normals.

AVIATION /00Z Thursday through Friday/

Issued 713 PM MDT WED MAY 13 2026 West winds 25-35kt gusts to 50 kt, in southern ID until 14/02Z. Areas of MVFR in blowing dust east of KBOI until 03Z. As of 13/23Z thunderstorms have shifted east of KJER and KTWF and will continue to shift away from those sites. VFR in eastern OR with west winds 15-30 kt until 14/02Z, then decreasing to 8 to 15 kt. Becoming VFR in all areas by 14/06Z with west/northwest wind decreasing to 10-20 kt.

KBOI...VFR. Surface winds NW 20-25 kt with gusts to 30 kt until sunset then decreasing to 10kt.

BOI WATCHES/WARNINGS/ADVISORIES

ID...Wind Advisory until midnight MDT tonight for IDZ012-014>016- 028>030. OR...Wind Advisory until midnight MDT /11 PM PDT/ tonight for ORZ064.