The National Weather Service (NWS) in San Francisco cautioned on Monday for potentially hazardous surf conditions along the Pacific coast. According to the NWS San Francisco website, long-period surf is expected to bring dangerous currents and the potential for sneaker waves. Beachgoers are advised never to turn their back to the ocean, to swim near a lifeguard if possible, and to exercise caution near the coast due to the unpredictability of sneaker waves.
In addition to the surf advisory, the NWS has released its Area Forecast Discussion, promising a week of dry conditions and temperatures hovering near seasonal averages. However, a slight cooling trend is forecasted for late next week. The marine layer at about 1500 feet is causing the usual morning coastal stratus, but skies are predicted to clear by the afternoons. An upper-level ridge to the north slowly regresses this marine layer, while an offshore cutoff low-pressure system weakens. These factors contribute to the stable weather pattern that's anticipated to stick around into the middle of the week.
For aviators, the morning forecasts promise widespread IFR/MVFR ceilings, with an expectation of some improvement in the afternoon. "Moderate onshore winds prevail through the TAF period," as noted in the forecast discussion issued by NWS San Francisco. The vicinity of SFO may experience a tough time with varying conditions, with clear skies potentially giving way to high IFR-low MVFR stratus as the day progresses.
Mariners aren't left out of the considerations, either. A fresh to strong westerly breeze is expected to develop in the bays, sticking around through the evening. Starting Monday afternoon, the coastal waters will see a fresh NW breeze kick up. The low amplitude, long-period southwesterly swell that's incoming will enhance currents and cause waves to break in deeper water. Boaters should be prepared for strong NW winds and rough seas expected to arrive by mid-week. Those venturing out on the water during this time should also be aware of Small Craft Advisories that NWS has issued for various parts of the Bay Area coastal waters.
