Sunrise 6:26 AM   Sunset 7:47 PM Moonrise 2:06 PM   Moonset 3:17 AM

  Print   HELP   Reset   Save   Recall

PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 814 Pm Pdt Thu Apr 18 2024
Today - W winds 5 to 10 knots. Wind waves 3 to 4 ft. Mixed swell nw 2 to 4 ft at 10 seconds and S 2 to 3 ft at 16 seconds. Tonight - W winds 5 to 10 knots. Wind waves 2 to 3 ft. Mixed swell nw 2 to 3 ft at 9 seconds and S 2 to 3 ft at 15 seconds. Patchy dense fog. Fri - W winds 10 to 15 knots. Wind waves 2 to 3 ft. Mixed swell nw around 2 ft at 9 seconds and S 2 to 3 ft at 15 seconds. Patchy dense fog. Fri night - NW winds 10 to 15 knots. Wind waves 3 to 4 ft. Mixed swell nw around 2 ft at 12 seconds and S 2 to 3 ft at 18 seconds. Patchy drizzle. Sat - NW winds 15 to 20 knots with gusts up to 25 knots. Wind waves 4 to 5 ft. SWell S around 2 ft at 17 seconds. Sat night - NW winds 15 to 25 knots. Wind waves 5 to 6 ft. Mixed swell nw around 2 ft at 13 seconds and S around 2 ft at 18 seconds. Sun - NW winds 15 to 20 knots with gusts up to 25 knots. Wind waves 4 to 5 ft. Mixed swell nw 2 to 4 ft and S around 2 ft. Mon - W winds 5 to 10 knots. Wind waves 3 to 4 ft. NW swell 3 to 5 ft and sw around 2 ft.

PZZ500 814 Pm Pdt Thu Apr 18 2024
Synopsis for the central california coast and bays including the Monterey bay - Greater farallones - .and cordell bank national marine sanctuaries - .
expect light to moderate winds into the weekend before breezy to gusty northerly winds arrive Saturday afternoon that will increase hazardous conditions over the waters. Wave heights will start to build heading into the late weekend before diminishing by mid- week. Another moderate period northwest swell arrives over the weekend as well as another light, longer period (18 seconds) southerly swell.

FXUS66 KMTR 190417 AFDMTR

Area Forecast Discussion National Weather Service San Francisco CA 917 PM PDT Thu Apr 18 2024

New UPDATE, MARINE

SYNOPSIS
Issued at 142 PM PDT Thu Apr 18 2024

A touch cooler Friday as a weak system moves through. Chance for light drizzle for coastal areas the next couple of days. Temperatures rebound late weekend and early next week. Chance for light rain enters the forecast mid next week.

UPDATE
Issued at 917 PM PDT Thu Apr 18 2024

Meso-scale models did a good job verifying a return of coastal stratus earlier today, however have since only picked up approx 50% of the full extent of the southerly SMX-SFO, SBA-SFO pressure gradients. Similarly it's true also regarding the ACV-SFO pressure gradient, the NAM typically is 1 mb too low between these two locations anyhow. The ACV-SFO, SMX-SFO and SFO-SAC pressure gradients have been/are similar in strength indicating general north-south convergence and onshore directed winds. The Fort Ord profiler shows the marine layer depth increasing to 1700 feet, the Bodega Bay profiler showing the depth steady near 1,000 feet. At and below the marine layer temperature inversion, sea surface temperatures, air temperatures and dew point temperatures (including above the marine temperature inversion where it's clear for nocturnal radiative cooling) remain conducive to night and morning stratus and fog development and with lower level cooling and gentle upslope flow, a few patches of coastal drizzle will likely continue. Daytime surface warming and mixing will erode the stratus and fog back close to the coastline. A greater push of cooler maritime air is forecast to reach far inland Tuesday.

On the other side of things, surface based convective potential over southeastern San Benito county quickly blossomed up to a thunderstorm with echo tops to 36 thousand feet during the late afternoon. Once formed the thunderstorm almost as quickly dissipated, but quite likely produced a decent downpour and possibly small hail; e.g. vertically integrated liquid approached but just stayed below low end double digits.

Current forecast looks good, please see below for more details.

SHORT TERM
(This evening through Saturday)
Issued at 142 PM PDT Thu Apr 18 2024

Increased cloud cover today along coastal areas south of SF as the marine layer deepens ahead of the approaching weak trough. Still looking like a progressive, open wave, this system will scoot through rather quickly Friday, bringing additional cloud cover and a slight chance for drizzle along coastal locations and higher elevations of the East Bay Friday and Saturday mornings. The other impact from this system will be the breezy NW winds that develop along the coast as the system departs. Generally looking at gusts of 25-30 mph along the immediate coast Saturday afternoon into Sunday afternoon.

LONG TERM
(Saturday night through next Wednesday)
Issued at 142 PM PDT Thu Apr 18 2024

By Sunday, ridging dominates the pattern once again with temps warming back into near 80 for inland areas and 60s to near 70 along the coast. Similar picture into Monday as well. Tuesday brings some changes. Ensemble guidance continues to advertise anomalous troughing over the EPac/West Coast during the mid-to- late next week period, hinting at a pattern that promotes above average precip and below average temperatures. Average precip for the second half of April for our region is roughly a half inch, give or take a few tenths depending on if you're coastal or inland. What we're expecting next week is generally on the order of a trace to a few tenths here and there. Longer terms guidance does show the pattern continuing into next weekend, where there could be additional light rainfall, bringing us into that ballpark of slightly above normal. The main caveat with this forecast is that while there is moderate to high confidence in the overall pattern, the confidence in widespread measurable rainfall is low. In fact, in a grouping of 100 different models, roughly 24 of them advertise any measurable precip for us at all through next weekend. The answer to the question of next week being widespread light rain or just some increased cloudiness and drizzle will need further refinement in future forecasts. For now, plan on the latter half of next week being cool and damp.

AVIATION
(00Z TAFS)
Issued at 445 PM PDT Thu Apr 18 2024

VFR through the remainder of the day with the exception of KMRY where the stratus straddling the coast, has moved over into the terminal causing MVFR conditions. The remainder terminals will start to see flight conditions lowering into MVFR/IFR tonight (with the exception of KSJC and KLVK, where VFR is expected to prevail)into the early morning hours, with low to moderate confidence of LIFR conditions in North Bay and Monterey Bay. Most terminals start to improve to VFR near 16-17Z. Moderate to breezy winds are expected to diminish overnight and rebuild Friday morning.

Vicinity of SFO...VFR through the remainder of today with possible MVFR conditions near 13Z but moderate confidence on ceiling height.
If conditions remain dry, there is a chance for VFR through the TAF period. Breezy onshore winds will start to diminish to light winds tonight before becoming breezy again Friday afternoon.

SFO Approach Bridge...Similar to SFO.

Monterey Bay Terminals...VFR with breezy onshore winds. Moderate confidence that IFR/LIFR conditions will return tonight into early Friday morning. VFR will prevail after 17Z. Light variable winds overnight before rebuilding Friday morning.

MARINE
(Tonight through next Wednesday)
Issued at 827 PM PDT Thu Apr 18 2024

Expect light to moderate winds into the weekend before breezy to gusty northerly winds arrive Saturday afternoon that will increase hazardous conditions over the waters. Wave heights will start to build heading into the late weekend before diminishing by mid- week. Another moderate period northwest swell arrives over the weekend as well as another light, longer period (18 seconds)
southerly swell.

MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...None.

toggle option: (graph/table)

Palo Alto Yacht Harbor
Click for Map
Thu -- 04:17 AM PDT     Moonset
Thu -- 04:25 AM PDT     2.21 feet Low Tide
Thu -- 06:28 AM PDT     Sunrise
Thu -- 09:21 AM PDT     6.84 feet High Tide
Thu -- 03:05 PM PDT     Moonrise
Thu -- 04:42 PM PDT     0.36 feet Low Tide
Thu -- 07:47 PM PDT     Sunset
Thu -- 10:43 PM PDT     6.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Palo Alto Yacht Harbor, California, Tide feet

Dumbarton Point 2.3 mi NE
Click for Map
Thu -- 03:25 AM PDT     -0.62 knots Max Ebb
Thu -- 04:17 AM PDT     Moonset
Thu -- 05:01 AM PDT     0.01 knots Slack
Thu -- 06:28 AM PDT     Sunrise
Thu -- 07:37 AM PDT     0.82 knots Max Flood
Thu -- 10:05 AM PDT     -0.01 knots Slack
Thu -- 02:58 PM PDT     -0.97 knots Max Ebb
Thu -- 03:05 PM PDT     Moonrise
Thu -- 05:21 PM PDT     0.00 knots Slack
Thu -- 07:46 PM PDT     Sunset
Thu -- 08:17 PM PDT     1.26 knots Max Flood
Thu -- 11:12 PM PDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION

Dumbarton Point 2.3 mi NE, South San Francisco Bay, California Current, knots

Full Color Weather Map

Link to Loop


Other links: GEOS-West     Contential US     Full GOES-East

San Francisco Bay Area, CA,