(KRON) -- Breezy to windy conditions and cooler temperatures are on tap this weekend as a potent system enters the Great Basin. A warming and drying trend is expected through the upcoming week as high pressure builds into the Pacific Northwest and northern California.
Winds will increase this weekend. The fiercest winds are anticipated over the open waters of the Pacific Ocean; however, some of the higher terrain regions, such as the North and East Bay mountains and hills, as well as the higher terrain of the Diablo Range, may see gusts exceeding 45 mph. There’s an elevated risk of grass fires with the increased winds and afternoon humidity dropping below 30% in some locations. Even though most areas (though not all) are still benefiting from winter rains, be sure to avoid activities that could spark a grass fire.
High clouds continue over the Bay Area, and low clouds have returned this morning as there is abundant low-level moisture. There are reports of coastal drizzle this morning as the marine layer has deepened overnight. Low clouds spreading further inland, the deepening of the marine layer, and an approaching trough of low pressure will result in a slight cool down for this afternoon. High temperatures will range from the mid-50s to mid-60s on northwest-facing coastal locations, to upper 60s to mid-70s across the interior. Northwesterly winds are expected by this afternoon with gusts 25-35 mph in lower elevations across the region, with stronger gusts up to 45 mph in the higher elevations and just along the North Bay coast.
Fire weather watch looms over portion of Bay AreaWinds ease slightly Saturday night into Sunday morning, with the exception of the higher elevations. Breezy and gusty winds will persist on Sunday. The trough will dig into the Great Basin through Sunday before ejecting further to the east. This will result in northerly, potentially offshore winds in the higher elevations and typically windy gaps and passes of Napa, Contra Costa, Alameda, and Santa Clara counties Sunday night into Monday. This will lead to elevated fire weather conditions as humidity values will be in the 40-50% range Sunday night and as low as 15% on Monday afternoon (again in the higher elevations).
High pressure will begin to build into the Pacific Northwest and northern California in the wake of the exiting trough, with Wednesday expected to be the warmest day. Temperatures Wednesday afternoon look to be 5-15 degrees above seasonal averages with mid-60s to mid-70s for coastal areas, mid-70s to lower 80s across the bayshore, and mid-80s to lower 90s across the interior. More of a zonal flow is expected by late next week with the likely return of a shallow marine layer and more seasonal temperatures.
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