The city by the bay has its share of weather-related quirks, and this week seems no different, despite the season's expected trends. San Franciscans are looking at an ordinary pattern of marine layer clouds to start their mornings, but there's an intriguing twist: the potential for dry thunderstorms in the North Bay today and possibly again from late Tuesday through Wednesday morning, as reported by the National Weather Service San Francisco. While temperatures are pegged to linger near seasonal norms, a cooling trend is on the radar toward the week's end.
Delving into the details of today and tonight, the typical foggy start is accompanied by a marine layer reaching upwards of 1,200 feet, with northwest winds tapering off to breezes in the evening. Mornings are forecasted to hold temperatures in the low to mid-50s, with the South to Southeast winds at the middle troposphere shaping an unusual atmospheric setup that should pique the interest of weather enthusiasts and wildfire watchers alike. "There is a great deal of variance regarding the amount, timing, and location of this moisture plume," notes the NWS forecast, striking on the unpredictability of the conditions that might generate these dry storms, a term describing thunderstorms that could spark wildfires.
According to the seven-day outlook provided by the National Weather Service's detailed forecast, the city's weather pattern continues with mostly cloudy mornings before becoming sunny, with highs steadied around the upper 60s. The evenings may witness a slight chance of drizzle before making way for increasing clouds with lows in the mid-50s.
Midweek brings a curious twist as an upper-level low pressure begins its journey southward, nudging a new pulse of moisture into the region. The forecast discussion from the NWS highlights the rise in mid-level lapse rates, possibly reinvigorating storm chances, albeit still staying below a 10% probability. "With much drier air around 900 mb, there will be some convective inhibition to overcome as well," the National Weather Service explains. The locals can expect a noticeable shift late Wednesday with the passage of a cold front, followed by a cooling trend that carries into the weekend, teasing a comfortable setting for Independence Day celebrations—with maybe, a bit of wind to contend with.
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