Saturday, December7, 2019
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Marine Weather and Tides
Boulder Creek, CA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:07AMSunset 4:51PM Saturday December 7, 2019 8:50 PM PST (04:50 UTC) Moonrise 2:30PMMoonset 2:32AM Illumination 86% Phase: Waxing Gibbous; Moon at 11 days in cycle
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.
Marine Forecasts
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PZZ560 Coastal Waters From Pigeon Point To Point Pinos California Out To 10 Nm- 928 Am Pst Sat Dec 7 2019
.small craft advisory in effect until 9 pm pst this evening...
Today..S winds 20 to 25 kt with gusts up to 30 kt. Wind waves 9 to 11 ft. W swell 6 to 8 ft at 14 seconds. Showers. A slight chance of Thunderstorms this afternoon.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt. Wind waves 5 to 6 ft. W swell 7 to 9 ft at 13 seconds. Rain likely and a slight chance of Thunderstorms.
Sun..W winds around 10 kt. Wind waves 1 ft. W swell 6 to 8 ft at 12 seconds. Rain likely.
Sun night..NW winds 5 to 10 kt. Wind waves 1 ft. W swell 5 to 7 ft at 11 seconds and S around 2 ft at 16 seconds.
Mon..NW winds 5 to 15 kt. Wind waves 1 to 2 ft. W swell 3 to 5 ft at 15 seconds and S around 2 ft at 16 seconds.
Mon night..N winds 5 to 15 kt. Wind waves 1 to 2 ft. NW swell 4 to 5 ft at 15 seconds and S around 2 ft at 16 seconds.
Tue..N winds up to 10 kt. Wind waves 1 ft. W swell 4 to 6 ft and S around 2 ft.
Wed..N winds up to 10 kt. Wind waves 1 ft. W swell 6 to 8 ft and S around 2 ft. Winds and wind waves higher in and near Thunderstorms.
PZZ500 928 Am Pst Sat Dec 7 2019
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... A secondary frontal boundary will move through the coastal waters today. Scattered Thunderstorms will move into the coastal waters which could produce lightning, gusty winds, and possible waterspouts. Breezy to gusty south to southwest winds will continue through the day today before diminishing this evening. A moderate west swell will continue through Sunday. Steep wind waves will continue through the day today creating hazardous seas.


7 Day Forecast for Marine Location Near Boulder Creek, CA
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location: 37.13, -122.29     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 080039 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 436 PM PST Sat Dec 7 2019

SYNOPSIS. Showery conditions through the morning, then another frontal band will move across the district bringing heavier showers and a chance of thunderstorms. Lingering showers on Sunday but trending drier by afternoon. Dry weather returns early next week.

DISCUSSION. as of 1:09 PM PST . The next round of rain has arrived to the North Bay. Latest KMUX radar imagery shows light to moderate rain falling across much of Sonoma and Napa Counties as of 1 pm PST. The rain is also starting to impact San Francisco this early afternoon. Expect the rain to continue spreading southeastward through the rest of the day. While we have yet to observe any lightning strikes in the San Francisco Bay Area, the chance of thunderstorms will continue through the evening hours for much of the region. The Day 1 Storm Prediction Center has the vast majority of the region in at least the general thunder category. Additionally, most of the North Bay is under a marginal risk for severe weather. The 18Z HRRR does indicate some locally impressive 0-1 km bulk shear and 0-1 km storm relative helicity values, but think the best potential for any sort of rotating storms will be to the east of the area in the Central Valley where the skies have thus far remained generally clear today. In addition to the thunderstorm risk, a Flash Flood Watch is in effect for the Kincade Fire burn area through 10 pm PST this evening.

Southerly winds will remain locally strong through the rest of the afternoon. Winds have already gusted above 40 mph at SFO, 31 mph at OAK, and at least 25 mph at MRY today. These winds will diminish later this afternoon or evening near sea level with breezy conditions likely persisting in the higher elevations into the overnight hours.

Scattered rain showers are expected to continue through about mid-day on Sunday as the upper level trough axis passes through the Bay Area. Behind this trough an upper level ridge will quickly build over the West Coast, bringing dry conditions to the Bay Area and Central California Coast for Monday and Tuesday. Models advertise a weak system that will impact parts of northern California around Wednesday. At this point it would appear the best chances for rain would be north of the Golden Gate with perhaps a few tenths of an inch. Another system will then arrive late Thursday or Friday to northern California, but again the best rain chances will be to the north of the Golden Gate. Overall -- all locations are expected to be significantly drier this upcoming week compared to the last few weeks. In fact, the latest 6-10 day precipitation outlook (valid December 13-17) from the Climate Prediction Center places much of central and southern California with favored odds of experiencing below normal precipitation.

AVIATION. as of 4:36 PM PST Saturday . Generally MVFR except IFR ceilings and visibilities in a band of heavy showers with a low level cold front coupled to an amplifying 700 mb trough pressing eastward over the Bay Area; echo tops 20 thousand feet with isolated tops to 25 thousand feet, lightning strikes so far observed east of our cwa. Additional amplification in the 700 mb trough including the trough at 500 mb tonight and Sunday generates more showers. Drier weather returning by the end of the 00z taf cycle.

With convergent winds focusing low level isotherms together, i.e. frontogenesis expect gusty prefrontal south winds to continue into the early evening before diminishing. Surface winds forecast to shift to southwest and west direction, but timing is low confidence due to initially mature and closed 500 mb low offshore transforms to an open wave before passing eastward over the cwa Sunday morning. The mid level trough axis will move east of the cwa Sunday afternoon with dry weather returning.

Vicinity of KSFO . MVFR ceiling with showers, possibly heavy, through 03z this evening, surface wind direction close to 210 degrees with winds subsiding by 03z. Best guess is that the surface wind will wait until late evening or early Sunday morning before shifting to 240 degree wind direction. West wind late Sunday morning at latest.

SFO Bridge Approach . Similar to KSFO.

Monterey Bay Terminals . VFR-MVFR ceilings with showers, possibly heavy at times, surface wind from the south. MVFR tonight with showers. Winds shifting to west to northwest by Sunday afternoon.

MARINE. as of 12:59 PM PST Saturday . A secondary frontal boundary will move through the coastal waters today. Scattered thunderstorms will move into the coastal waters which could produce lightning, gusty winds, and possible waterspouts. Breezy to gusty south to southwest winds will continue through the day today before diminishing this evening. A moderate west swell will continue through Sunday. Steep wind waves will continue through the day today creating hazardous seas.

MTR WATCHES/WARNINGS/ADVISORIES. Tngt. Flash Flood Watch . CAZ506-507 SCA . SF Bay until 9 PM SCA . Mry Bay until 9 PM SCA . Pt Arena to Pt Reyes 0-10 nm until 9 PM SCA . Pt Reyes to Pigeon Pt 0-10 nm until 9 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm until 9 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm until 9 PM SCA . Pt Arena to Pigeon Pt 10-60 nm until 9 PM SCA . Pigeon Pt to Pt Piedras Blancas 10-60 nm until 9 PM



PUBLIC FORECAST: Rowe AVIATION: Canepa MARINE: BFG

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
46042 - MONTEREY - 27NM West of Monterey Bay, CA 25 mi30 min SSW 9.7 G 14 58°F 57°F1015.3 hPa57°F
RTYC1 - 9414523 - Redwood City, CA 26 mi50 min SW 5.1 G 7 60°F 56°F1014.7 hPa (+1.1)
46114 - West Monterey Bay, CA 28 mi50 min 57°F10 ft
46092 - MBM1 30 mi103 min SSW 18 58°F 57°F1014.3 hPa (+0.8)
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 35 mi30 min S 14 G 16 58°F 56°F1014.3 hPa56°F
MLSC1 - Moss Landing, South Harbor, CA 35 mi71 min SSW 14 G 37 58°F 1015.4 hPa56°F
ELXC1 - Elkhorn Slough Reserve, CA 36 mi65 min NNE 8 59°F 1015 hPa58°F
46240 - Cabrillo Point, Monterey Bay, CA (158) 40 mi50 min 57°F5 ft
MEYC1 42 mi74 min 57°F1015.1 hPa
AAMC1 - 9414750 - Alameda, CA 44 mi50 min SSE 5.1 G 8 57°F 54°F1013.9 hPa
LNDC1 46 mi50 min S 6 G 7 58°F 1013.6 hPa (+1.0)
PXOC1 - 9414311 - San Francisco (Pier 1), CA 46 mi50 min E 5.1 G 8 59°F 1012.5 hPa (+1.4)
OBXC1 47 mi50 min 59°F 57°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 47 mi50 min SW 8 G 12 59°F 1013.6 hPa (+1.2)
FTPC1 - 9414290 - San Francisco, CA 48 mi50 min SSW 8.9 G 15 58°F 54°F1013.7 hPa (+1.1)
46237 - San Francisco Bar, CA (142) 49 mi50 min 55°F8 ft

Wind History for Redwood City, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

Link to 5 minute data for KNUQ

Wind History from NUQ (wind in knots)
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Tide / Current Tables for Ano Nuevo Island, California
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Ano Nuevo Island
Click for Map
Sat -- 12:15 AM PST     1.50 feet Low Tide
Sat -- 02:33 AM PST     Moonset
Sat -- 06:40 AM PST     4.90 feet High Tide
Sat -- 07:09 AM PST     Sunrise
Sat -- 01:36 PM PST     0.92 feet Low Tide
Sat -- 02:30 PM PST     Moonrise
Sat -- 04:51 PM PST     Sunset
Sat -- 07:32 PM PST     3.41 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.62.12.83.64.34.84.94.63.932.11.4111.31.82.433.43.43.12.72.3

Tide / Current Tables for Santa Cruz, California
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Santa Cruz
Click for Map
Sat -- 12:17 AM PST     1.68 feet Low Tide
Sat -- 02:31 AM PST     Moonset
Sat -- 06:56 AM PST     5.00 feet High Tide
Sat -- 07:07 AM PST     Sunrise
Sat -- 01:42 PM PST     1.02 feet Low Tide
Sat -- 02:28 PM PST     Moonrise
Sat -- 04:51 PM PST     Sunset
Sat -- 07:57 PM PST     3.43 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.71.82.22.83.64.34.854.84.23.32.41.61.111.31.82.433.33.43.32.92.5

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for San Francisco/Monterey Bay Area, CA (23,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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