Marine Weather Net

San Francisco Bay north of the Bay Bridge, including San Pablo Bay, Suisun Bay, and West Delta, CA Marine Forecast


TODAY

SW
WINDS
5 - 10
KNOTS

TONIGHT

SW
WINDS
15 - 25
KNOTS

SUN

SW
WINDS
10 - 15
KNOTS

SUN NIGHT

SW
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
PZZ530 Forecast Issued: 204 AM PDT Sat Jul 20 2024

SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH THIS EVENING
Today...Sw Wind 5 To 10 Kt, Rising To 15 To 30 Kt This Afternoon. Waves Around 2 Ft Or Less.
Tonight...Sw Wind 15 To 25 Kt. Waves Around 2 Ft Or Less.
Sun...Sw Wind 10 To 15 Kt. Waves Around 2 Ft Or Less.
Sun Night...Sw Wind 5 To 10 Kt. Waves Around 2 Ft Or Less.
Mon...Sw Wind 5 To 10 Kt. Waves Around 2 Ft Or Less.
Mon Night...Sw Wind 5 To 10 Kt. Waves Around 2 Ft Or Less.
Tue...Sw Wind 5 To 10 Kt, Rising To 10 To 15 Kt In The Afternoon. Waves Around 2 Ft Or Less.
Tue Night...Sw Wind 10 To 15 Kt, Easing To 5 To 10 Kt After Midnight. Waves Around 2 Ft Or Less.
Wed...Sw Wind 5 To 10 Kt, Rising To 10 To 15 Kt In The Afternoon. Waves Around 2 Ft Or Less.
Wed Night...Sw Wind 10 To 15 Kt, Easing To 5 To 10 Kt After Midnight. Waves Around 2 Ft Or Less.
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Area Forecast Discussion
National Weather Service San Francisco CA 434am PDT Sat July 20 2024

.SHORT TERM... (Today and tonight) Issued at 210am PDT Sat July 20 2024

Still warm today, but temps are on their way down for the weekend. Many locations should shave off 3-5 degrees compared to yesterday. The Heat Advisory is no longer in effect for the weekend, but temps far inland are still rather warm, so those especially sensitive to heat should still exercise caution. The real story for today comes later this evening when a transient shortwave trough skirts through our area, causing a deepening of the marine layer, cooler overnight temps tonight, and another few degrees shaved off the afternoon highs tomorrow. In addition to cooler temps, the trough is expected to bring some wind to the area. Particularly along coastal and gap areas. The timing of this looks to be late afternoon to early evening, which is ideal because peak heating will have passed and humidity will be on the rise. Therefore, fire weather concerns for today are primarily fuel driven where we are seeing near record energy release component among 10- and 100-hour fuels in the North Bay.

Long Term
(Sunday through Friday) Issued at 210am PDT Sat July 20 2024

Sunday looks to be rather pleasant as temps drop a little bit further. If you live in inland areas, this will be your chance to spend some time outside before the next heat event. Once the trough completely moves out by Sunday night, 500 mb height rises continue as a ridge starts to build back in. Currently targeting Monday through Thursday as the period of interest in which we will see elevated HeatRisk. Particularly Tuesday and Wednesday where areas of the South Bay and inland East Bay will see more on the side of major HeatRisk. In terms of temps, it's looking on par with what we just went through. 100-105 inland, 85-95 along the Bay, 65-75 along the coast. The marine layer looks to remain intact as onshore flow prevails, so the thinking is that the coast will once again be mostly shielded. We are assessing the need for heat hazards that will likely be posted for Monday - Thursday
o stay tuned for the latest information. On a lighter note, temperatures start to cool off from Thursday into next weekend with the potential for BELOW NORMAL afternoon highs by next Saturday. There is still some uncertainty, but ensemble cluster analysis seems to advertise this pattern relatively well, which would result in at least some degree of cooling.

Marine
(Today through Thursday) Issued at 418am PDT Sat July 20 2024

Gusty northwest winds continuing over the coastal waters through the weekend, with gale force gusts mainly across the northern waters. In the unprotected waters, short period seas will deteriorate to very rough by Sunday. Gusty winds will persist into the work week over the outer waters.

Fire Weather
Issued at 417pm PDT Fri July 19 2024

...Near critical fire weather conditions continue through Saturday due to hot and dry conditions inland... Dry and warm conditions continue inland with very dry fine fuels contributing to an increased risk of fire starts. This results in near critical fire weather conditions through Saturday across the interior regions of the North Bay, East Bay, South Bay, and Monterey and San Benito counties. Onshore winds will develop each afternoon and evening, with peak gusts in the gaps and passes up to 30 to 40 miles per hour. The strongest gusts appear to develop for the evening hours on Saturday, but as relative humidities are expected to be recovering from daytime minimums during the period of peak wind gusts, the alignment between dry air and high winds is not there for acute fire weather concerns.

NOAA San Francisco Bay Area Office: Watches - Warnings - Advisories
CA...Coastal Flood Advisory until 2am PDT Tuesday for CAZ006-506-508.

PZ...Small Craft Advisory from 3pm this afternoon to 9pm PDT this evening for SF Bay N of Bay Bridge.

Small Craft Advisory until 9am PDT this morning for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM.

Gale Warning from 9am this morning to 3am PDT Sunday for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm.

Small Craft Advisory until 9am PDT Sunday for Pt Reyes to Pigeon Pt 0-10 nm.

Small Craft Advisory until 3am PDT Sunday for Pigeon Pt to Pt Pinos 0-10 nm.

Small Craft Advisory until 3pm PDT this afternoon for Pt Pinos to Pt Piedras Blancas 0-10 nm.

Gale Warning from 3pm this afternoon to 3am PDT Sunday for Pt Pinos to Pt Piedras Blancas 0-10 nm.

Gale Warning from 9am this morning to 9pm PDT Sunday for Pt Arena to Pt Reyes 10-60 NM.