NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION. Privacy and Cookie policy

PKZ129 Passage Canal- 401 Am Akst Wed Mar 8 2023
.small craft advisory Thursday...
Today..W wind 15 kt diminishing to 10 kt in the afternoon. Seas 2 ft.
Tonight..W wind 10 kt. Seas 2 ft.
Thu..W wind 25 kt. Gusts to 35 kt near whittier in the afternoon. Seas 2 ft.
Thu night..W wind 25 kt. Seas 3 ft.
Fri..W wind 25 kt. Seas 3 ft.
Sat..W wind 15 kt. Seas 2 ft.
Sun..W wind 10 kt. Seas 2 ft.

PKZ100
No data

FXUS66 KMTR 040527 AFDMTR

Area Forecast Discussion National Weather Service San Francisco CA 1027 PM PDT Tue Oct 3 2023

New AVIATION, MARINE

SYNOPSIS
Issued at 125 PM PDT Tue Oct 3 2023

Surface high pressure developing over the Great Basin will result in downsloping, warming, and drying offshore breezes to the Bay Area coastline this week. Expect well above normal high temperatures, but readings should remain below record values at most locations. Cooler onshore breezes return by late in the weekend with troughing approaching from the northwest.

SHORT TERM
(This evening through Wednesday)
Issued at 125 PM PDT Tue Oct 3 2023

An expansive high pressure ridge over the northeast Pacific will progress towards NorCal and the Pacific Northwest as its influence over our area increases. After a cool morning with coastal fog temperature are on the upswing this afternoon as readings climb well into the 60s and 70s. Highs today should top out in the 70s along the coast with lower to mid 80s for the warmest inland spots. Light offshore flow should increase tonight with a moderating influence on overnight lows. Readings will only drop into the mid to upper 50s across much of the Central Coast, with upper 50s to lower 60s around the Bay Area. A few of the higher spots in the North Bay interior Mountains should remain in the mid to upper 60s. While fire weather concerns remain modest, there will be a short period of breezy winds and lowered RH tonight particularly around Mt. St. Helena. Otherwise the bigger warmup commences tomorrow. Plentiful sunshine, clear skies, and compressional/downslope warming should allow for a quick upward jump in surface temperatures. Look for midday highs to reach the upper 70s and 80s along the coast, with upper 80s to lower 90s inland. This setup (unlike most others this summer) favors warm temperatures at the coast. So the normally cooler spots like downtown SF and Monterey will not be spared from the heat. These locations are likely to at least reach the lower 80s before the afternoon seabreeze kicks in and drops readings during the evening hours.

LONG TERM
(Wednesday night through next Monday)
Issued at 125 PM PDT Tue Oct 3 2023

Thursday through Saturday:

Our weather will remain dominated by a stout high pressure ridge encompassing the western CONUS. Its influence will wane towards Saturday however as upstream troughing encroaches from the NE Pacific. Our heat event should peak on Thursday into Friday with high pressure in control and a likely lack of marine layer clouds.
Winds will remain light and offshore, with the daily seabreeze arriving later in the day along the coast. This should allow temperatures to heat up appreciably with inland highs climbing well into the 80s and 90s. Once again the coastal spots will not be spared this go around with highs at least into the low to mid 80s.
Taking a look at probabilistic temperature guidance from the National Blend of Models, downtown San Francisco has a 90th percentile value (representing a "reasonable worst case" scenario)
of 89 and 87 degrees for Thursday and Friday respectively. So while the official forecast is a few degrees below this, its not out of the question that some portions of the city could near or eclipse the 90 degree mark. Given the lack of really warm days along the coast this year it's possible that Thursday and/or Friday end up among the warmest days of 2023 within the city.
With these thoughts in mind, some adjustments to the maximum and hourly temperature grids were made and/or maintained to represent this potential. It does appear that readings may decrease a bit on Saturday as an upstream trough encroaches on the region from the Pacific. Saturday still looks warm, but odds are we'll see a bit more onshore flow and coastal cooling as compared to the previous few days. Overnight lows should generally range from the mid 50s to the mid 60s; warmest in the hills and within the urban corridors.

Sunday through Tuesday:

Some erosion of the upper ridge is anticipated along its northwest periphery as upper troughing enters the Pacific Northwest. This will bring cooler temperature to the area, along with a likely return of marine layer clouds. A trailing front attendant to the upper trough does look to approach the North Bay late in the forecast period, with slight chance PoPs reaching the Bay Area. Ensembles are split on whether measurable rain reaches the North Bay but this will be something to fine tune with future forecast updates. Temperatures should remain seasonal with non-coastal highs generally in the 70s to around 80. Cooler readings will prevail along the coast.

AVIATION
(06Z TAFS)
Issued at 1027 PM PDT Tue Oct 3 2023

Generally VFR throughout the region with stratus coverage limited to the immediate coast and near Monterey Bay, although lingering stratus is expected to dissipate within the next couple of hours.
Light offshore flow will keep stratus away overnight. Winds will remain offshore through Wednesday afternoon across the inland areas, with onshore flow prevailing closer to the coast.

Vicinity of SFO... VFR through the TAF period. Light offshore flow Wednesday morning before breezy west winds up to 12 knots resume in the afternoon.

SFO Bridge Approach... Similar to SFO.

Monterey Bay Terminals... IFR-LIFR stratus at the terminals for now, but should clear out within a couple of hours. Light northwest winds continue to diminish through the night with some valley drainage flows possible in the morning, before onshore winds up to 12 knots resume Wednesday afternoon.

MARINE
(Tonight through next Sunday)
Issued at 1027 PM PDT Tue Oct 3 2023

Breezy northwest winds continuing into midweek, but will diminish and become light for the late week. Moderate period southerly swell 12 to 14 seconds persists through the week, in addition to a northwest swell at around 11 to 13 seconds.

CLIMATE

Record high data for this week:

Location Oct 4th Oct 5th Oct 6th ------------------------------------------------------------------ Santa Rosa 101 1920 103 1933 102 1930 Kentfield 99 1987 100 1987 97 1930 Napa 100 1987 101 1987 96 1930 Richmond 99 1987 99 1987 91 1996 Livermore 106 1980 100 1980 100 2014 San Francisco 100 1987 102 1987 94 1992 SFO 95 1987 99 1987 92 1992 Redwood City 101 1980 99 1987 99 1987 Half Moon Bay 87 1953 82 2013 87 1972 Oakland City 92 2014 96 1987 93 1976 Salinas 100 1987 105 1987 95 1972 King City 106 1944 105 1933 100 1996

MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...Small Craft Advisory until 9 AM PDT Wednesday for PZZ570.

toggle option: (graph/table)

Applegate Island
Click for Map
Tue -- 04:45 AM AKDT     11.14 feet High Tide
Tue -- 08:03 AM AKDT     Sunrise
Tue -- 10:27 AM AKDT     2.67 feet Low Tide
Tue -- 03:27 PM AKDT     Moonset
Tue -- 04:23 PM AKDT     13.25 feet High Tide
Tue -- 07:18 PM AKDT     Sunset
Tue -- 07:43 PM AKDT     Moonrise
Tue -- 11:13 PM AKDT     -0.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Applegate Island, Alaska, Tide feet

Culross Bay
Click for Map
Tue -- 04:30 AM AKDT     11.34 feet High Tide
Tue -- 08:04 AM AKDT     Sunrise
Tue -- 10:20 AM AKDT     2.67 feet Low Tide
Tue -- 03:29 PM AKDT     Moonset
Tue -- 04:09 PM AKDT     13.45 feet High Tide
Tue -- 07:18 PM AKDT     Sunset
Tue -- 07:41 PM AKDT     Moonrise
Tue -- 11:06 PM AKDT     -0.46 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Culross Bay, Wells Passage, Alaska, Tide feet

Full Color Weather Map

Link to Loop


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

San Francisco Bay Area, CA,