textproduct: Boise

UPDATE

Updated aviation discussion.

KEY MESSAGES

- Continued warming through Sunday, leveling off Monday. Slight cooling Tuesday and Wednesday, then warmer again Thursday.

- Dry through Sunday, except a 10-20 percent chance of showers and thunderstorms near the Nevada border Saturday and Sunday afternoons/evenings, then a 20-40 percent chance in southern areas Monday afternoon/evening, decreasing Tuesday. Dry all areas Wednesday.

SHORT TERM /Through Sunday Night/

Issued 221 PM MDT FRI MAY 1 2026 Continued warming through Sunday as an upper ridge passes overhead today and tonight, followed by southwest and then southerly flow aloft as a Pacific upper low nears the OR/CA coast. The low center is forecast to move southward off the coast Sunday and Monday then inland across central California late Monday. This track will keep rain out of our CWA through Sunday, but a slight chance (15-20%) of showers and thunder- storms will develop near the Nevada border late Sunday,

LONG TERM /Monday through Friday/

Issued 221 PM MDT FRI MAY 1 2026 The upper low will move onto the central California coast on Monday and across the southern Great Basin on Tuesday. Moisture on the northern flank of the low will bring showers and thunderstorms to our area on Monday, with the highest chances (30-50%) along the Nevada border and over the Boise Mountains, with chances decreasing to the north and west. Shower and thunderstorm potential will begin to decrease on Tuesday as the low moves to the east, with dry conditions returning by Wednesday. Thunderstorms early next week may produce brief heavy rain, small hail, and gusty winds. The upper low to our south will bring breezy northerly winds each afternoon and evening. The upper ridging over the Pacific Northwest will keep temperatures above normal with Thursday the warmest day.

AVIATION /00Z Saturday through Sunday/

Issued 524 PM MDT FRI MAY 1 2026

VFR, with SCT-BKN high clouds. Surface winds: NE-SE 5-15 kt, then variable up to 12 kt after sunset. Winds aloft at 10kft MSL: S 5-15 kt.

KBOI...VFR, with SCT-BKN high clouds. Areas of reduced visibility over Boise Mtns due to prescribed fires. Surface winds: E-S 5-12 kt.

Weekend Outlook...Generally VFR. Mid to high clouds on Saturday with a 10-20% chance of showers and thunderstorms near the OR/NV border. A 10-20% chance of showers/thunderstorms Sunday afternoon in SE Oregon, ID-NV border, and west-central ID Mtns. Surface winds: Saturday E-S 5-15 kt, Sunday NW-NE 5-15 kt. Outflow wind gusts to 25-40 kt with storms Sat/Sun, creating potential for blowing dust.

BOI WATCHES/WARNINGS/ADVISORIES

ID...None.

OR...None.