There is still a chance that winds may top 30 mph the rest of this evening, as a cold front approaches our region. Although rare, storm force winds of 48 knots or greater can occur with the strongest of these winter storms. By the second half of the month, Pacific weather systems begin to move through the San Francisco Bay Area. In fact, small craft advisory conditions occur nearly every day in summer through the central and northern San Francisco Bay and eastward through the Carquinez Strait. Air Quality
Special Marine Warning: Potentially hazardous over-water events of short duration (two hours or less) such as thunderstorms with strong gusty winds.

Strong or moderately strong El Nino winters tend to be characterized by higher than normal precipitation across central and southern California. The Pacific high gradually loses strength while heating over the interior subsides. This signifies a weather system with higher pressure is approaching. Typically, strongest winter winds occur in the hours just prior to the cold frontal passage. Weather forecasters refer to high pressure and low pressure systems when discussing weather conditions. The low clouds that form in this situation are called stratus clouds. Diablo), Lat/Long 38.2N/123.3W 37.8N/122.8W 37.4N/122.9W 36.8N/122.4W, Location Bodega Bay San Francisco Half Moon Bay Monterey, source*: http://www.sfmx.org/support/amsc/archivedocs/Weather%20in%20the%20San%20Francisco%20Bay.pdf, *article courtesy of the Marine Exchange of the San Francisco Bay Region, http://www.boatingsf.com/links/sf-bay-weather, http://www.wrh.noaa.gov/mtr/sfd_sjc_climate/sfd/SFD_CLIMATE3.php, https://en.wikipedia.org/wiki/San_Francisco_fog, e: info@boardsportscalifornia.com p: 415-385-1224, © 2020 Boardsports School, LLC DBA Boardsports California.
Also known as pressure characteristic or pressure change. Winter weather is often highly variable. A zone separating two air masses, of which the cooler, denser mass is advancing and replacing the warmer. Also, when a marine layer does develop in the spring, it typically is not as shallow as the summer season marine layer, and so dense fog episodes occur more rarely. During the months of June, July and August the eastern Pacific high is well established offshore while a trough of low pressure is a nearly a constant feature over California’s interior. NOAA Weather Radio (NWR): The NWR network provides voice broadcasts of coastal marine forecasts on a continuous cycle. Pise) San Francisco North Bay Marine (Big Rock Ridge), 162.550 KEC-49 162.450 WWF-64 162.425 KZZ-75, San Jose/Monterey (Mt. This area is considered to have a Mediterranean climate: hot, dry summers and cool, rainy winters. Beginning in March 2006, NWS San Francisco Bay Area began issuing a specific forecast for the San Francisco Bar as part of the Coastal Waters Forecast (CWF) product. July Wind Southwest Oregon Regional Airport (5.6 miles) 2020 June July. As moist air blowing across the Pacific comes into contact with the cold upwelled coastal waters, condensation occurs and a layer of low clouds and/or fog develops. Past Derby/Oaks/Thunder Weather

The rate at which air is moving horizontally past a point. Most yearly rainfall in the Bay Area occurs between mid-November and early April, with the stormiest months being December, January and February (though late November and even much of March can also have active stormy periods). Decision Support Page Thunderstorms in summer can produce brief heavy rain and local gusty winds. Broadcast coverage extends across the bays and typically offshore about 25 nautical miles. Although there are no forecasts issued specifically for marine navigation areas to the east of the delta, public forecasts and warnings are issued for the southern Sacramento Valley, northern San Joaquin Valley, and Delta by the NWS Forecast office in Sacramento. The graphic below indicates where 2016, from January 1st to present, compares to similar times period back to 1971 at Louisville International Airport. People often mistakenly refer to stratus clouds as fog or “high fog.” By definition, fog is composed of tiny water droplets that are in contact with the surface, essentially a cloud in contact with the ground. Even during offshore winds events though, a weak late afternoon and early evening seabreeze often develops. To date, there have been 38 days with peak wind gusts greater than or equal to 30 mph, whereas there have been 10 days with peak wind gusts greater than or equal to 40 mph!


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