Point Pinos to Point Piedras Blancas out 10-60 NM Marine Forecast
|Tonight...Nw Winds 15 To 25 Kt With Gusts Up To 30 Kt. Wind Waves 6 To 7 Ft. Swell S 2 To 3 Ft At 15 Seconds.|
|Thu...Nw Winds 15 To 25 Kt With Gusts Up To 40 Kt. Wind Waves 7 To 8 Ft. Swell S Around 3 Ft At 15 Seconds.|
|Thu Night...Nw Winds 20 To 30 Kt With Gusts Up To 40 Kt. Wind Waves 9 To 10 Ft. Swell S Around 3 Ft At 14 Seconds.|
|Fri...Nw Winds 15 To 20 Kt With Gusts Up To 30 Kt. Wind Waves 7 To 8 Ft. Swell S Around 3 Ft At 13 Seconds.|
|Fri Night...Nw Winds 15 To 25 Kt With Gusts Up To 30 Kt. Wind Waves 6 To 7 Ft. Swell S 2 To 3 Ft At 13 Seconds.|
|Sat...Nw Winds 10 To 15 Kt. Wind Waves Around 6 Ft. Swell S Around 2 Ft At 13 Seconds.|
|Sat Night...Nw Winds 10 To 15 Kt. Wind Waves 5 To 6 Ft. Swell S Around 2 Ft At 12 Seconds.|
|Sun...Nw Winds 10 To 15 Kt. Wind Waves 5 To 6 Ft. Swell S Around 2 Ft.|
|Mon...Nw Winds 10 To 15 Kt. Wind Waves 5 To 6 Ft. Swell S Around 2 Ft.|
| 840 PM PDT Wed Aug 4 2021 |
Synopsis for the Central California Coast and Bays Including the Monterey Bay, Greater Farallones and Cordell Bank National Marine Sanctuaries - PZZ500
Surface high pressure over the eastern Pacific will result in northwest winds over the coastal waters through the period. Gusty afternoon and early evening west winds will develop over the San Francisco Bay north of the Bay Bridge to the Delta. Steep short period northwest waves continue to dominate the sea state along with a moderate period southerly swell.
| Area Forecast Discussion|
National Weather Service San Francisco Bay Area
925pm PDT Wednesday August 4 2021
Increased onshore flow will result in more widespread night/morning clouds and coastal drizzle. Cooler temperatures are also expected, especially closer to the coast. Seasonable weather conditions are then anticipated Friday and into the upcoming weekend.
as of 09:23pm PDT Wednesday...While new and ongoing wildfires continue to burn across the northern and interior portion of the state, tranquil conditions prevail over the San Francisco Bay Area
and Central Coast. A well-defined marine layer deepening in response to a mid/upper level low offshore has allowed for patchy drizzle and/or mist within the stratus push this evening. Look for these low clouds to spread well inland into the valleys overnight with temperatures generally cooling into the 50s. That said, the ongoing forecast remains on track with no changes anticipated at this time.
One thing we are keeping a close eye on is how much smoke from northern California will get wrapped up in the mid/upper level low forecast to push inland through late week. The latest 00Z HRRR (High-Resolution Rapid Refresh) Vertically Integrated Smoke data indicates some of smoke aloft from the ongoing fires to our north will get advected off of the northern California coast on Thursday before shifting back inland over the Bay Area by Friday. With this, cannot rule out an increase in smoke aloft over the 24-36 hours. By about 36-48 hours out, the HRRR (High-Resolution Rapid Refresh) indicates some of this smoke may mix down closer to the surface which could result in smoky, hazy sky conditions (especially over the North Bay and East Bay). This said, please refer to either the Bay Area Air Quality Management District or Monterey Bay Air Resources District for more information.
persists right along the coast or a little offshore from the Bay Area and Central CA coastline this afternoon. The marine layer continues to vary between 1500 and 2000 ft deep which, coupled with onshore flow, has allowed for more cooling inland. Several sites are reporting about 1-6 degrees cooler than 24 hours ago.
Looking at the synoptic pattern, an upper level trough is still on track to move into NorCal tonight into Thursday. That will help support our continued marine layer and the cooler temperatures. It's also likely that the marine stratus along the coast could be thick enough to produce drizzle and we may even see a few observations of measurable precipitation from that drizzle. Even the hi-res NAM has been showing hints of light precipitation for some of our coastal locations. Don't be surprised if you need to use your windshield wipers tomorrow morning.
As this trough moves into CA, this will enhance onshore flow so we expect breezy to windy conditions along the coast. Speaking of winds, many people have called our office concerned about smoke from the larger wildfires in far NorCal. The smoke is being pushed north and eastward from the southwesterly flow as that trough moves inland. Thus, the Bay Area and Central CA coast won't have any smoke concerns.
The trough will continue to track eastward Thursday night into Friday which will allow for a minor warm up on Friday and Saturday. Highest temperatures will be in the interior portions of our CWA where max temps will range in the upper 80s to upper 90s. Closer to the coast and Bay area will see upper 60s to mid 80s.
In the extended forecast, there's the potential for another trough to track well north of our CWA. This will likely nudge our temperatures back down to seasonable values.
as of 09:23pm PDT Wednesday...Surface high pressure over the eastern Pacific will result in northwest winds over the coastal waters through the period. Gusty afternoon and early evening west winds will develop over the San Francisco Bay north of the Bay Bridge to the Delta. Steep short period northwest waves continue to dominate the sea state along with a moderate period southerly swell.
NOAA San Francisco Bay Area Office: Watches - Warnings - Advisories
.Tngt...SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm