The National Weather Service has issued an Extreme Heat Watch for much of the Portland metro area and an Excessive Heat Warning for southwest Oregon, prompting the City of Beaverton to open an after-hours cooling center and the office of emergency management to recommend several ways to stay cool.

SEATTLE — Ahead of a weekend where temperatures could exceed 90 degrees in parts of western Washington, the National Weather Service (NWS) issued a Heat Advisory and Extreme Heat Warning that took effect Friday. A strong ridge of high pressure to our south will expand its reach across the area raising daytime highs across the Puget Sound region.

The advisory begins at noon Friday and remains in effect through 9 a.m. Saturday, with highs between 99 and 102 degrees expected both days. Overnight lows will stay in the upper 60s. The alert covers the greater Reno-Carson City-Minden area and Mineral and southern Lyon counties.

The weather service issued a heat advisory Tuesday — the first one issued since late May — for Thursday through late Friday covering eastern Sonoma County and most of Napa County outside the valley. On Thursday, the weather service extended it through Saturday night and issued a new heat advisory just for Thursday for the North Bay valleys.

At 2:27 a.m. on Saturday, the NWS Reno NV issued a heat advisory in effect until Sunday at 9 a.m. for Lassen-Eastern Plumas-Eastern Sierra counties.

On Friday at 4:52 a.m. the National Weather Service issued a heat advisory valid from 11 a.m. until Monday 5 a.m. for North Oregon Coast Range and Central Oregon Coast Range.

NWS issues Heat Advisory for parts of Bay Area and Central Coast, warning against heat-related illnesses and advising caution with pets and outdoor activities.