Marine Weather and Tides
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 7:06AM||Sunset 4:53PM||Monday December 9, 2019 11:22 PM PST (07:22 UTC)||Moonrise 3:38PM||Moonset 4:33AM||Illumination 97%|
7 Day Forecast for Marine Location Near Carmel-by-the-Sea, CAHourly EDIT Help
Area Discussion for - San Francisco/Monterey Bay Area, CA  (on/off)  Help NOTE: mouseover dotted underlined text for definition
FXUS66 KMTR 100603 AFDMTR
Area Forecast Discussion National Weather Service San Francisco Bay Area 1003 PM PST Mon Dec 9 2019
SYNOPSIS. Dry conditions with mild temperatures are forecast through Tuesday afternoon. Patchy dense fog is likely during the night and morning hours. A weak weather system may produce light rain from late Tuesday into early Wednesday. Dry conditions are then forecast for most of the second half of the work week before rain chances increase by Friday night or Saturday.
DISCUSSION. as of 9:43 PM PST Monday . GOES-17 night-time microphysics imagery and metar observations show low clouds cover much of the Bay Area this evening. An exception is a recent report from Byron of 1/4 mile visibility in fog, however fog has since lifted there. High clouds offshore continue to drift toward land and will thicken tonight and Tuesday morning. 24 hour trends show most places are either the same or one to three degrees milder while dew point temperatures have decreased a few degrees; a signature of less radiative cooling at the surface due to low clouds and upward displacement of water vapor per decreased surface dew point temperatures mostly supporting low clouds compared to this time last evening. Outgoing radiative cooling necessary for fog to form is lacking at the moment. Decided to scale back fog in the forecast grids by a few hours. Still thinking at least patchy fog will develop overnight and Tuesday morning, however the midnight shift may need scale back fog coverage in the grids a bit more if low and high clouds thicken and persist. Based on recent temperature guidance and persistence of cloud cover decided to bump up low temperatures for Tuesday morning by a few degrees.
For additional information on the forecast please see the previous discussion.
PREV DISCUSSION. as of 12:55 PM PST Monday . Fog blanketed a good portion of the San Francisco Bay Area and parts of the central California coast this morning. Many airports throughout the region reported visibilities down to 1/4 mile or less. By mid-morning, the severity of the fog had gradually improved, allowing for the Dense Fog Advisory to expire as scheduled at 10 AM PST. With that said, though, as of mid-day overcast skies and locally-reduced visibilities are still being observed. Some locations may never clear this afternoon. With the high-amplitude upper level ridge over our area, will likely see a repeat overnight tonight and into Tuesday morning with fog impacting the area valleys and locations near sea level. Will monitor visibility trends closely and let the evening or night shift make the determination about any new Dense Fog Advisories.
The upper level ridge will quickly push eastward into the North American continent during the day on Tuesday. A fast-moving shortwave trough will then approach the California coast late Tuesday and into Wednesday. The precipitation associated with this shortwave will be light. Best potential for more than a few tenths of an inch of rain will be in the North Bay. The latest 3-km NAM brings around a tenth to a quarter of an inch to San Francisco and the East Bay with lesser amounts in the Santa Clara Valley. The timing of this rain looks to fall in the middle to late evening hours on Tuesday, wrapping up early to middle morning Wednesday. Some locations in Monterey and San Benito County will likely remain dry. Overall, low impacts are anticipated.
A broad, flat upper level ridge in the eastern Pacific between 20 and 30 degrees north latitude will largely push the core storm track to our north from the middle of the week onward. Models advertise a strong system to impact the Pacific Northwest and British Columbia late Wednesday and into Thursday. The North Bay will be on the far southern end of this system with the potential for light rain on Thursday or Friday. Little rainfall (if any) is expected south of the Golden Gate based on the latest guidance. Again, little or no weather-related impacts anticipated in our area.
And behind the late week system comes another shortwave trough over the weekend. Models have backed off a bit over the past several model runs in terms of rainfall totals, indicating a few or several tenths of an inch of rain. If the forecast plans out, little or no weather-related impacts are expected this this system as well.
Looking ahead to late this weekend and into early next week, both the GFS and ECMWF bring a ridge back to the West Coast. While this week from a synoptic meteorological aspect is rather active, the overall rain impacts from the series of successive systems will likely remain low for the San Francisco Bay Area.
AVIATION. as of 10:00 PM PST Monday . For 06z TAFs. A low stratus deck sits over the Bay Area and the Central Coast providing mostly MVFR conditions at local terminals. Unstable air near the surface has prevented any low clouds/fog from developing early, like it did last night. FG messaging in the TAFs have been mostly removed to account for the lower confidence event; however, low cigs and reduced vis on approaches are still forecast at this time for early Tuesday morning. Clouds can still be expected to lift in the afternoon, but remain ahead of the approaching system. That system brings chances for rain as it moves in from northwest heading southeast.
Vicinity of KSFO . MVFR conditions remain as stratus clouds linger between 1,200 and 2200 feet. Cigs are still expected to lower in the early morning hours and vis can be reduced on approaches. Patchy fog is possible, but with lower confidence than the previous TAF issuance. By about 20z, clouds should lift slightly, but remain ahead of the next system moving into the area. Light rain is forecast tomorrow after 00z, first in the North Bay, and then reaching terminals in the broader Bay Area.
SFO Bridge Approach . Similar to KSFO.
Monterey Bay Terminals . Stratus sits over the peninsula providing MVFR conditions. Cigs will lower and vis is forecast to be reduced. Patchy fog is possible, but lower cigs and reduced vis is still expected Tuesday morning. Clouds lift in the afternoon around 20z and winds remain light.
MARINE. as of 09:48 PM PST Monday . Northwest winds will continue to be light over the coastal waters tonight and into Tuesday morning. Patchy fog is possible Tuesday morning. A weak system approaches from the northwest moving toward San Francisco Tuesday night, bringing a chance of showers in the evening and into Wednesday while winds turn southerly. The moderate northwest swell will continue through the end of the week before a larger and longer period northwest swell arrives closer to the weekend.
MTR WATCHES/WARNINGS/ADVISORIES. Tngt. None.
PUBLIC FORECAST: Canepa/Rowe AVIATION: DK MARINE: DK
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Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|46028 - CAPE SAN MARTIN - 55NM West Northwest of Morro Bay, CA||97 mi||33 min||NNW 12 G 16||56°F||58°F||6 ft||1022.5 hPa||53°F|
|46239 - Point Sur, CA (157)||100 mi||23 min||58°F||6 ft|
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Monterey Regional Airport, CA||120 mi||29 min||ESE 4||10.00 mi||Overcast||56°F||51°F||84%||1024.4 hPa|
Link to 5 minute data for KMRY
Wind History from MRY (wind in knots)
|1 day ago||SW||SW||SW||SW||SW|
|2 days ago||S||NW||N||S||S|
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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 (2,6,7,8)(on/off)  Help
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