Sunday, December8, 2019
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Marine Weather and Tides
Montezuma, KS

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 7:40AMSunset 5:22PM Saturday December 7, 2019 11:06 PM CST (05:06 UTC) Moonrise 3:00PMMoonset 3:02AM 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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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 928 Am Pst Sat Dec 7 2019
.small craft advisory in effect until 9 pm pst this evening...
Today..S winds 15 to 25 kt with gusts up to 35 kt. Showers and a slight chance of Thunderstorms.
Tonight..SW winds 10 to 20 kt with gusts up to 25 kt. Showers and a slight chance of Thunderstorms.
Sun..SW winds up to 10 kt. Rain likely.
Sun night..N winds around 5 kt.
Mon..W winds up to 10 kt. Patchy fog.
Mon night..W winds up to 10 kt.
Tue..NE winds up to 10 kt.
Wed..NE winds up to 10 kt. 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 South San Francisco, CA
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location: 40.64, -100.36     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 080447 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 847 PM PST Sat Dec 7 2019

SYNOPSIS. Scattered showers will continue overnight and into Sunday morning. Showers will end from north to south on Sunday afternoon. Dry conditions are then forecast for most of next week, except for light rain chances late Tuesday and Tuesday night and then again late in the week. Temperatures will be near seasonal averages through next week.

DISCUSSION. As of 8:45 PM PST . A line of intense showers associated with an upper trough near the northern California coast produced very heavy rain in San Francisco this afternoon. Rain rates in excess of an inch per hour in the City resulted in widespread street flooding. Heavy downpours occurred locally elsewhere in the Bay Area during mid to late afternoon. Showers have since tapered off and radar shows most shower activity is currently across Monterey and San Benito Counties, with only widely scattered showers farther to the north. Expect some showers to produce brief heavy downpours overnight, mainly across the southern half of our forecast area. Heavy rain across the Kincade burn scar appears unlikely from this point forward, and so the Flash Flood Watch for that area in Sonoma County will be allowed to expire at 10 pm.

Gusty south to southwest winds occurred today as a surface low tracked inland near the CA/OR border. Wind gusts up to 50 mph were common at higher elevations this afternoon and local gusts up to 40 mph occurred near the coast. Winds have been gradually subsiding this evening, and a trend towards decreasing winds is expected to continue for the remainder of the evening as the surface low moves northeast and weakens.

Scattered showers will continue into Sunday morning as the upper trough gradually tracks to the southeast across California. Showers will taper off and end after the upper trough axis passes, which is expected to occur in the North Bay by late morning and across the southern portions of our area by late afternoon. Additional rainfall through Sunday is forecast to range from a quarter to half inch in most areas, with locally higher amounts possible in the coastal hills.

A high amplitude ridge is forecast to build over California on Monday and this will result in dry conditions across our entire region through at least Tuesday morning. A weak system is then forecast to bring a brief period of light precipitation to northern California from late Tuesday afternoon through Tuesday night. Rain chances during this time frame will be highest across the North Bay, with lower chances farther to the south. A broad upper ridge is then expected to build off the southern California Coast during the second half of next week, resulting in generally dry and mild conditions except for the potential for another brief round of light rain in the North Bay late in the week.

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 . Kincade Burn Scar until 10 pm

PUBLIC FORECAST: Dykema AVIATION: Canepa MARINE: BFG

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
RTYC1 - 9414523 - Redwood City, CA 1178 mi48 min S 4.1 G 8.9 60°F 56°F1014.7 hPa
AAMC1 - 9414750 - Alameda, CA 1180 mi54 min SSW 7 G 8 57°F 54°F1013.9 hPa

Wind History for Alameda, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Dodge City, Dodge City Regional Airport, KS23 mi14 minS 1410.00 miFair42°F33°F71%1011.7 hPa

Link to 5 minute data for KSFO

Wind History from SFO (wind in knots)
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1 day agoCalmCalmE6CalmNE3SE3CalmCalmCalmCalmSE7E11
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2 days agoCalmCalmCalmCalmNE3E3SW3E3SE3E4SE4NE7E5NE3NE5CalmCalmSW3CalmN9N7N5N4Calm

Tide / Current Tables for Point San Bruno, San Francisco Bay, California
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Point San Bruno
Click for Map
Sun -- 03:12 AM PST     1.99 feet Low Tide
Sun -- 03:31 AM PST     Moonset
Sun -- 07:11 AM PST     Sunrise
Sun -- 09:12 AM PST     6.91 feet High Tide
Sun -- 02:57 PM PST     Moonrise
Sun -- 04:26 PM PST     0.61 feet Low Tide
Sun -- 04:50 PM PST     Sunset
Sun -- 10:30 PM PST     5.36 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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43.12.422.234.15.46.46.96.764.93.52.11.20.70.71.42.43.64.75.35.3

Tide / Current Tables for Oyster Point 2.8 mi E, South San Francisco Bay, California Current
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Oyster Point 2.8 mi E
Click for Map
Sun -- 12:47 AM PST     -0.94 knots Max Ebb
Sun -- 03:31 AM PST     Moonset
Sun -- 03:42 AM PST     0.00 knots Slack
Sun -- 06:43 AM PST     0.80 knots Max Flood
Sun -- 07:11 AM PST     Sunrise
Sun -- 09:45 AM PST     -0.01 knots Slack
Sun -- 01:14 PM PST     -1.53 knots Max Ebb
Sun -- 02:57 PM PST     Moonrise
Sun -- 04:39 PM PST     0.00 knots Slack
Sun -- 04:50 PM PST     Sunset
Sun -- 07:40 PM PST     0.87 knots Max Flood
Sun -- 10:47 PM PST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.9-0.9-0.7-0.40.10.50.70.80.70.3-0.2-0.8-1.3-1.5-1.4-1.1-0.50.20.60.80.90.70.4-0.1

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for San Francisco/Monterey Bay Area, CA (0,6,7,8)
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Ground Weather Radar Station San Francisco Bay Area, CA
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.