Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
A ridge of high pressure is forecast to build over California on Monday, and North County temperatures could reach 110 degrees. The record high for June 27 at Paso Robles Municipal Airport is 110 degrees, set back in 1956.
Strong to gale-force northwesterly winds along the coastline — and the cooler marine air that they bring — are expected to keep the coastal valleys in the high 80s. The beaches will range from the mid- to high 60s, except for the southwesterly facing beaches of Cayucos, Avila Beach and Shell Beach, which should reach the mid-70s.
The ridge of high pressure is forecast to weaken Tuesday into Friday. This condition will produce lower temperatures, decreasing northwesterly winds and a persistent marine layer during the night and morning hours, with pockets of mist and drizzle along the beaches and in the coastal valleys. The marine layer may become deep enough to reach the North County during the early morning hours. A few of the northwesterly facing beaches, like Morro Bay and Los Osos, may remain overcast through the afternoon hours. Subtropical moisture is also likely to begin streaming in from the south early this week, bringing a chance of afternoon thunderstorms to the southern Sierra Nevada from Tuesday through Thursday.
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The high-pressure ridge is then expected to rebuild over California late next weekend and into the Fourth of July holiday time frame. There may be more marine influence near the coast, and consequently, temperatures are not expected to rise that much; however, the North County will likely get above 100 degrees.
Monday’s 5- to 7-foot northwesterly (320-degree, deep-water) sea and swell (with a 5- to 8-second period) will remain at this height and period through Wednesday, becoming a 6- to 8-foot northwesterly (300-degree, deep-water) swell (with an 8- to 11-second period) Thursday into Friday. This swell is expected to decrease this weekend.
A 1-foot Southern Hemisphere (200-degree, deep-water) swell (with a 17- to 20-second period) is expected to arrive Tuesday, increasing to 1 to 2 feet Wednesday and peaking Friday at 2 to 3 feet (with a 16- to 18-second period).
Seawater temperatures are projected to range from 51 to 54 degrees through Friday.
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This week’s PG&E safety tip: This week’s Southern Hemisphere swell could produce strong rip currents along many of San Luis Obispo County’s beaches. If you’re caught in a rip current, swim out of the current in a direction parallel to the shoreline. When out of the current, swim at an angle — away from the current — toward shore. Also, never turn your back to the ocean; “sneaker” waves can inundate beaches and pull you in.
John Lindsey’s Weekly Forecast is special to The Tribune. He is PG&E’s Diablo Canyon Power Plant meteorologist and media relations representative. Contact him at email@example.com. Follow him on Twitter @PGE_John.
This week’s temperatures
LOWS AND HIGHS, PASO ROBLES
LOWS AND HIGHS, SLO AND COASTAL VALLEYS