Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
High pressure will continue its eastward progression, as an upper-level trough will develop off the Pacific Northwest. This condition will produce gentle to moderate (8 to 18 mph) north to northwesterly winds, persistent marine low clouds along the coastal regions and near- to slightly below seasonal temperatures throughout the Central Coast today into the Independence Day holiday.
Note: The base of the coastal clouds should be high enough to still allow for a nice viewing of the municipal fireworks displays along the coastline. Fireworks are made to burst at different heights, depending on the size of the shell and how the fireworks are packed. Most fireworks displays along our coastline reach altitudes from a few hundred to 1,000 feet.
The northwesterly winds will increase to fresh to strong (19 to 31 mph) levels Wednesday, further building to strong to gale-force (25 to 38 mph) levels along the coast Thursday into Saturday as high pressure builds back into California from the east. These winds will help to mix out the marine layer during the afternoon hours, leaving behind mostly clear skies.
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In response to increasing high pressure, a gradual warming trend will develop, with the North County reaching triple digits and the coastal valleys warming to the mid-80s on Friday into Saturday. The beaches will remain in the 60s, except for Cayucos, which will reach the 70s and Avila Beach and Shell Beach, which could reach the low 80s over this time frame.
There is a chance for monsoonal moisture to move into San Luis Obispo and Santa Barbara counties the following week, which would result in muggy conditions and a chance for isolated thunderstorm development across elevated terrain.
A 3- to 5-foot northwesterly (310-degree, deep-water) swell (with an 8- to 11-second period) is forecast along our coastline Monday into Thursday morning.
Increasing northwesterly winds will generate a 4- to 6-foot (315-degree, deep-water) sea and swell (with a 5- to 9-second period) Thursday afternoon into Friday morning, increasing to 5 to 7 feet with the same period Friday afternoon into Sunday.
Temperatures will range between 52 and 54 degrees through Saturday.
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John Lindsey’s Weekly Forecast is special to The Tribune. He is PG&E’s Diablo Canyon Power Plant marine meteorologist and media relations representative. Contact him at firstname.lastname@example.org. Follow him on Twitter @PGE_John.
This week’s temperatures
LOWS AND HIGHS, PASO ROBLES
LOWS AND HIGHS, SLO AND COASTAL VALLEYS