Marine Weather Net

San Francisco Bay South of the Bay Bridge Marine Forecast


THIS AFTERNOON

W
WINDS
10 - 15
KNOTS

TONIGHT

NW
WINDS
10 - 15
KNOTS

SUN

NW
WINDS
5 KNOTS

SUN NIGHT

W
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
PZZ531 Forecast Issued: 240 PM PDT Sat Jul 13 2024

This Afternoon...W Wind 10 To 15 Kt. Waves Around 2 Ft Or Less.
Tonight...Nw Wind 10 To 15 Kt, Easing To 5 To 10 Kt After Midnight. Waves Around 2 Ft Or Less.
Sun...Nw Wind Around 5 Kt, Rising To 10 To 15 Kt In The Afternoon. Waves Around 2 Ft Or Less.
Sun Night...W Wind 10 To 15 Kt, Easing To Around 5 Kt After Midnight. Waves Around 2 Ft Or Less. A Slight Chance Of Very Light Drizzle After Midnight.
Mon...W Wind Around 5 Kt, Rising To 10 To 15 Kt In The Afternoon. Waves Around 2 Ft Or Less. A Slight Chance Of Very Light Drizzle In The Morning.
Mon Night...W Wind 10 To 15 Kt, Easing To Around 5 Kt After Midnight. Waves Around 2 Ft Or Less.
Tue...Sw Wind Around 5 Kt, Becoming W 10 To 15 Kt In The Afternoon. Waves Around 2 Ft Or Less.
Tue Night...W Wind 10 To 15 Kt, Easing To Around 5 Kt After Midnight. Waves Around 2 Ft Or Less.
Wed...W Wind Around 5 Kt, Rising To 10 To 15 Kt In The Afternoon. Waves Around 2 Ft Or Less.
Wed Night...W Wind 10 To 15 Kt, Easing To Around 5 Kt After Midnight. Waves Around 2 Ft Or Less.
SHARE THIS PAGE:           
Area Forecast Discussion
National Weather Service San Francisco CA 503pm PDT Sat July 13 2024

.SHORT TERM... (This evening through Sunday) Issued at 155pm PDT Sat July 13 2024

We continue to closely monitor satellite, radar and observations for incoming mid level moisture and instability from southern California. So far we're only seeing a few passing showers and since high resolution model output shows plenty of convective inhibition the expectation is this will continue to greatly limit any potential for thunderstorm development through afternoon and evening. There's forecast steepening of the 700-500 mb temperature lapse rates and weak mid level convective potential out ahead and northeast of the 500 mb low, currently 275 miles west of Point Conception, arriving late tonight and Sunday morning however just above this the 500-300 mb layer is stable. From approx the 700 mb level (~ 10,000 feet) downward through the 925 mb level (~ 2,500 feet) thermal ridging, stability remains in place tonight and Sunday morning.

Warm to hot far inland again this afternoon, however cloud cover will help reduce incoming solar input a little bit helping reduce highs a little compared to Friday afternoon. Cooler temperatures prevail along the coast and in the nearby coastal valleys due to increasing maritime influence, including coastal stratus and fog.

Long Term
(Sunday night through next Friday) Issued at 155pm PDT Sat July 13 2024

Summer continental surface heating continues to correspond to strong 500 mb heigheights with a nearly stationary high pressure system over the west with the center near the Four Corners. A stable north hemispheric pattern shows signs of strengthening and becoming unsteady again with five long wave troughs developing by late next week. One long wave trough is forecast to slowly progress eastward to along western North America while a long wave ridge primarily strengthens over central Canada with an extension, possibly the southern extension retrogressing toward the southwestern states. The GEFS/EPS ensemble 850 mb mean temperature forecasts for our forecast area climb back to 26 Celsius next weekend, not quite as warm as of recent, but bears watching.

Marine
(Tonight through next Friday) Issued at 503pm PDT Sat July 13 2024

Slight chances of isolated light rains showers exist this weekend over the waters, though any precipitation that does fall is most likely to be drizzle. Otherwise, gentle to moderate northerly winds continue through the afternoon today but begin to turn more southerly starting Sunday. These light southerly winds are expected to continue through the middle part of next week, but then turn to become more northwesterly beyond then.

Fire Weather
Issued at 1030am PDT Sat July 13 2024

Mid level cloud cover/moisture moving up from southern California is resulting in widely scattered showers, a few spots have reported a trace (and possibly light measurable precipitation) reaching the ground. Forecast soundings show widespread convective inhibition over our forecast area today i.e. stability greatly helping to preclude thunderstorm development. Per satellite and high resolution model output, mid level cloud cover over our forecast area will help reduce incoming solar input today. 12z statistical guidance shows slightly cooler temperature trends including inland areas today. The marine layer temperature inversion at the mountain tops is still quite warm, however 24 hour trends show cooler temperatures almost everywhere this morning, also resulting in positive humidity trends.

A well established marine layer with coastal stratus has recently shown signs of deepening per Bodega Bay and Fort Ord profiler data. The southerly and onshore pressure gradients and winds prevail which will help usher higher humidity to the inland valleys, hills and eventually mountain tops.

NOAA San Francisco Bay Area Office: Watches - Warnings - Advisories
CA...
Heat Advisory until 9pm PDT this evening for CAZ504-510-513>515- 517-518.

PZ...None.