Marine Weather and Tides
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.
|Sunrise 6:54AM||Sunset 7:05PM||Tuesday September 22, 2020 3:42 AM PDT (10:42 UTC)||Moonrise 12:06PM||Moonset 10:12PM||Illumination 26%|
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 221000 AFDMTR
Area Forecast Discussion National Weather Service San Francisco Bay Area 300 AM PDT Tue Sep 22 2020
SYNOPSIS. Temperatures remain at or just below normal despite gradually cooling through Thursday. Winds will remain onshore, driven by the weak cold front passing through. Friday will begin to warm before higher pressure along the coast sets up over the weekend ushering in a return to hot temperatures for the Bay Area. These hot temperatures will be coupled with dry offshore winds and lower humidities. Warmer temperatures remain next week as the higher pressure only shifts slightly to the east.
DISCUSSION. as of 03:00 AM PDT Tuesday . High clouds pass over the Bay Area this evening as a short wave upper level trough moves eastward over the region. Patchy fog is being reported around coastal areas, but the short wave has driven a compression of the marine layer to below 800 feet; however, satellite is showing stratus redeveloping along the coastline. Clouds should rebuild and move over the Bay Area over the course of the morning. Patchy, dense fog is also possible for low lying coastal areas.
A long wave trough over the Gulf of Alaska extends southward to the Oregon/California border and will move toward British Columbia through the course of the week. Meanwhile, higher pressure will develop over the southeastern Pacific Ocean, stretching a ridge northeastward over the Southern California and most of the Bay Area and Central Coast. This set-up will drive consistent onshore flow over the region. Temperatures will moderate and remain at seasonal levels in the 70s and 80s, if not slightly cooler, through Thursday. A weak cold front ahead of the long wave trough will pass over the California coastline on Thursday. Most of the front will be north of Sonoma county, so very little impacts are expected with the front; but there is a chance of some light drizzle possible in the coastal North Bay Thursday.
500 mb heights will begin lowering on Thursday as the long wave trough moves eastward toward the Rockies. By Friday, the trough axis will be east of Nevada with high pressure developing over the Pacific Ocean. As the trough digs toward the Great plains and high pressure strengthens, the forecast becomes focused on a stark warm up of temperatures with winds turning to offshore.
Confidence is increasing as models have consistently showed increasing high pressure over the weekend reaching a max height of 597 dm just of the coast. 850 mb temperatures on both the GFS and Euro are between 24-26 degrees Celsius. It's a far cry from the 600 dm high that was over the Four Corners over the Labor Day weekend heat wave with 850 mb temps up to 30, but it will be strong enough to raise temperatures into the 90s and lower-100s for inland areas. Temperatures in the 80s are expected closer to the coast, but since this pattern will also set-up offshore winds the chance still exists to update the forecast to warmer coastal temperatures. Given that the event is still several days away, there is lower confidence that the offshore winds will mix down to the surface, driving the warmer temperatures. For now, the strongest winds will be at elevated terrain in North Bay Mountains and East Bay Hills. The Santa Cruz Mountains are possible, but there is lower confidence at this time. At this time, strongest wind gusts will likely be at the highest peaks and ridges around 30 to 35 mph. Winds are expected to begin gradually rotating to the north late on Friday evening, but the main timeline for the stronger offshore winds will be Saturday morning through early Monday morning, with peak winds on Sunday morning. The offshore winds will also eliminate any impacts of the marine layer and bring drier air over the Bay Area, reducing humidities and raising fire concerns which will be monitored as new information comes in and confidence increases.
By Monday, models start to disagree, but the high pressure looks to only shift slightly eastward with the next trough building and approaching the west coast by midweek next week. While hottest temperatures are expected on Sunday and Monday, it is expected to remain warm in the middle of next week, though temperatures will begin to decrease. However, the dry conditions will remain, with no substantial precipitation in the forecast.
AVIATION. As of 10:43 PM PDT Monday . for 06Z TAFs. Satellite imagery shows coastal stratus returning and mid to high level clouds moving eastward with a weak 500 mb trough. Marine layer stratus will move inland further overnight. Clouds are expected to scatter out on Tuesday morning by 17z.
Vicinity of KSFO . VFR. The marine layer is expected to deepen overnight allowing the stratus to move back into the Bay Area for MVFR cigs overnight, possibly lowering to IFR. Clearing after 17z. Winds will increase Monday afternoon with strongest winds up to 25 kts
SFO Bridge Approach . Possible lowered slant-range vis from haze, otherwise similar to KSFO.
Monterey Bay Terminals . VFR except IFR/LIFR vicinity KWVI with stratus cigs developing elsewhere around the Monterey Bay and the northern Salinas Valley overnight. Light onshore winds through the evening and overnight. Clearing expected after 17z on Tuesday with continued onshore flow for the afternoon.
BEACHES. as of 02:34 PM PDT Monday . A larger northwest swell arrives late Thursday evening and into Friday morning. The main impacts will be increased wave heights breaking near the shoreline and an increased risk of rip currents developing along coastal beaches. With the increase in temperatures inland expected this weekend, beachgoers should be mindful of the increased wave activity and rip currents. The wave activity is forecast to gradually decrease through the weekend, but caution is advised through at least Sunday morning.
MARINE. as of 02:55 AM PDT Tuesday . A 1020 mb high is centered 900 miles west of Pt Pinos. A 979 mb low is in the Gulf of Alaska. This low will generate a large northwest swell that will arrive Thursday and Friday. Northwest winds will be light to moderate with the strongest winds along the inner coastal waters.
MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM SCA . Pt Arena to Pigeon Pt 10-60 nm until 9 AM SCA . Pt Arena to Pt Reyes 0-10 nm SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm from 3 PM
PUBLIC FORECAST: DK AVIATION: Lorber/Canepa BEACHES: DK MARINE: W Pi
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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||32 min||NNW 16 G 19||58°F||1015 hPa||58°F|
|46239 - Point Sur, CA (157)||100 mi||46 min||55°F||4 ft|
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.
|Monterey Regional Airport, CA||120 mi||48 min||WSW 6||10.00 mi||Fair||0°F||0°F||%||1015.9 hPa|
Link to 5 minute data for KMRY
Wind History from MRY (wind in knots)
|1 day ago||SE||Calm||Calm||SW||Calm||Calm||N||NW||N||N||NW||N||W||W||NE||E||SE||E||Calm||Calm||Calm||Calm|
|2 days ago||W||NW||SW||SW||W||W||NW||NW||NW||NW||NW||NW||NW||W||W||SW||SW||SW||Calm||Calm||Calm||W||Calm||Calm|
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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
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