Marine Weather Net

San Mateo Point to the Mexican Border from 30 to 60 nm out including San Clemente Island Marine Forecast


TONIGHT

W
WINDS
10 - 15
KNOTS

WED

VARIABLE
WINDS < 10
KNOTS

WED NIGHT

THU

S
WINDS
10
KNOTS

The Marine Weather Forecast In Detail:
PZZ775 Forecast Issued: 130 PM PDT Tue May 17 2022

Tonight...Wind W 10 To 15 Kt...Becoming Sw After Midnight. Gusts To 20 Kt. Wind Waves 3 Ft In The Evening... Becoming 2 Ft Or Less. Mixed Swell W 4 To 6 Ft At 9 Seconds And S 2 Ft At 17 Seconds.
Wed...Wind Se 10 Kt In The Morning...Becoming Variable Less Than 10 Kt. Wind Waves 2 Ft Or Less. Mixed Swell W 3 To 5 Ft At 9 Seconds And S 2 Ft At 16 Seconds.
Wed Night...Wind S To 10 Kt. Wind Waves 2 Ft Or Less. Mixed Swell W 2 To 4 Ft At 9 Seconds And S 2 To 3 Ft At 16 Seconds.
Thu...Wind S 10 Kt. Wind Waves 2 Ft Or Less. Mixed Swell W 2 To 4 Ft At 9 Seconds And S 2 To 3 Ft At 16 Seconds.
Thu Night...Wind S 10 Kt. Gusts To 15 Kt After Midnight. Wind Waves 2 Ft Or Less. Mixed Swell W 2 To 3 Ft At 10 Seconds And S 3 Ft At 16 Seconds.
Fri...Wind S 10 Kt With Gusts To 15 Kt. Wind Waves 2 Ft Or Less. Mixed Swell W 2 To 4 Ft And S 3 Ft.
Fri Night...Wind Variable Less Than 10 Kt. Wind Waves 2 Ft Or Less. Mixed Swell W 2 To 4 Ft And S 3 Ft.
Sat...Wind Variable Less Than 10 Kt...Becoming Sw 10 Kt In The Afternoon. Wind Waves 2 Ft Or Less. Mixed Swell W 2 To 3 Ft And S 3 Ft.
Sat Night...Wind Variable Less Than 10 Kt. Wind Waves 2 Ft Or Less. Mixed Swell W 2 To 3 Ft And S 3 Ft.
Sun...Wind Variable Less Than 10 Kt...Becoming W 10 Kt In The Afternoon. Wind Waves 2 Ft Or Less. Mixed Swell W 2 To 3 Ft And S 3 Ft.
Sun Night...Wind W 10 Kt In The Evening...Becoming Variable Less Than 10 Kt. Wind Waves 2 Ft Or Less. Mixed Swell W 2 To 3 Ft And S 3 Ft.
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Area Forecast Discussion
National Weather Service San Diego CA
900pm PDT Tuesday May 17 2022

Synopsis
Onshore flow and the marine layer will bring night and morning low clouds and patchy fog west of the mountains through early next week. Late this week, there will likely be a couple days with limited daytime clearing near the coast. Otherwise, brief high pressure aloft will bring a little bit of warming Wednesday, with cooler weather mainly Friday and Saturday as a broad trough of low pressure covers the West. There will be a warming trend early next week as high pressure over the eastern Pacific expands into California.

For Extreme Southwestern California Including Orange... San Diego...Western Riverside and Southwestern San Bernardino Counties
Update... Stratus continues to expand along the coast and up to 5-10 miles inland at mid-evening and will continue to expand inland overnight and cover most valleys with an assist by the coastal eddy. Aircraft soundings show the marine inversion base around 1800 feet MSL. With the trough moving through and to our southeast, Wednesday should be slightly warmer in most locations as brief ridging moves over, with good daytime clearing. However, a broad trough will move by to the north and ultimately cover most of the western US Friday/Saturday, and time-height cross sections of the models suggest a deep marine layer with widespread night and morning stratus which will be unlikely to clear back to the coast around Friday/Saturday. Gusty west winds will occur at times in the mountains and deserts, and onshore pressure gradients, up to around +15 MB from SAN to LAS, plus continuous 15-20 deg F surface temperature differences between the valleys and the deserts.

From previous discussion... A longwave upper level trough will develop across the Western states Thursday and Friday. This will strengthen the onshore flow across the area, with periods of gusty west winds expected over the mountains, desert slopes, and deserts beginning Thursday afternoon and lasting through Saturday morning. Wind gusts could reach low end Advisory criteria in these areas this period. The marine layer will deepen once again with low clouds spreading well inland during the overnight hours then burning off land areas by afternoon. Expect temperatures to trend a little cooler over the inland valleys and mountains this period.

Temperatures will be hot over the lower deserts through early next week, with readings over 100 degrees likely Wednesday/Thursday and again Sunday/Monday, with temps reaching 104-108 degrees especially by early next week. Temperatures will be a little cooler Friday and Saturday with the effects of the longwave trough to our north.

Ensemble guidance continues to show a warming trend in temperatures for Sunday and Monday, with temps climbing above normal by Monday. However, neither the 12Z GFS nor ECMWF (European Centre for Medium-Range Weather Forecasts) ensembles are particularly strong with the ridging that develops aloft. In addition, ECMWF EFI is not hinting at anything that significant by Monday. NBM v4.0 guidance shows about a 20% chance of temps of 95 degrees or higher at Inland Empire cities like Chino, Ontario, and Riverside on Monday. Generally kept temps close to NBM guidance early next week but will need to watch trends in the ensembles toward more ridging or further warming.

Marine
No hazardous marine conditions are expected through Saturday.

Skywarn
Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions.

NOAA San Diego CA Office: Watches - Warnings - Advisories
CA...NONE. PZ...NONE.