As the Bay Area grapples with gusty conditions, the National Weather Service (NWS) San Francisco issued an updated Wind Advisory effective 10 AM this morning. The advisory warns of northerly to northeasterly winds across the region, including the North Bay Interior Valleys and Coast, San Francisco, the San Francisco Bayshore, and the East Bay Interior Valleys. According to the National Weather Service, residents can expect sustained winds of 20-30mph, with gusts reaching 40-50mph.
These vigorous conditions result from a high-pressure system over the Great Basin, pushing offshore winds through the bays and coastal waters. The advisory originally covered areas known for higher altitude gusts, such as Mt. St. Helena, where wind speeds reached the 60-70 mph range, and near Mt. Diablo, with 40-50 mph winds reported. Adding to the disruption, areas within the advisory's reach, such as the interior North Bay, could see gusts up to 40 mph persist into tonight.
For mariners, these offshore patterns mean periods of challenging conditions across the bays and coastal waters, which are expected to continue through late Thursday night. NWS San Francisco notes that a "high pressure over the Great Basin will result in periods of offshore winds," creating potentially hazardous conditions for those on the water. As the week progresses, the forecast suggests a brief reprieve with the high-pressure weakening and a low-pressure trough moving across the Pacific Northwest by Friday.
However, the lull might be short-lived. Surface high pressure is anticipated to rebuild over the Great Basin by the weekend, ushering another round of offshore winds. The NWS forecast predicts "occasional gusty NE winds will likely linger into Thursday for the high terrain." With different projections on the horizon, the weather pattern is expected to shift around mid-next week, possibly ushering in some rainfall.
Throughout this blustery period, the NWS consistently assures VFR (Visual Flight Rules) conditions for aviators over the Bay Area. "Gusty offshore winds will begin to ease Wednesday morning, with high confidence that VFR will persist through the TAF period," as their Aviation Weather Report mentioned per the National Weather Service. This suggests air travel should remain largely unaffected, although ground-level impacts might include disrupted transport and the potential for downed trees or power lines.
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