SLO County weather forecast for the week of June 23

Here is this week's weather forecast by PG&E meteorologist John Lindsey.

Special to The TribuneJune 22, 2014 

Here is this week’s weather forecast by PG&E meteorologist John Lindsey:

The best adjective to describe this week’s weather would be windy. A 1,024-millibar Eastern Pacific High will remain stationary about 600 miles to the west of San Luis Obispo, while a series of late-season, upper-level troughs will sweep through Northern and Central California this week.

This morning’s coastal low clouds will clear as strong to gale-force (25- to 38-mph) northwesterly winds develop along the coastline and mix out the marine layer, giving plenty of sunshine.

Today’s high temperatures could reach triple digits in the North County. However, increasing northwesterly (onshore) winds will keep the coastal valleys in the mid-70s. The beaches are forecast to range from the low 60s along the northwesterly facing beaches (Morro Bay, Los Osos, Montaña de Oro State Park and the Nipomo Mesa), the mid-60s at the westerly facing beaches (Cambria and Pismo Beach) to the high 60s along the southwesterly facing beaches (Cayucos, Avila Beach and Shell Beach).

The marine low clouds will redevelop tonight into Tuesday morning, but much like today, they will clear by the afternoon. High temperatures are expected to once again reach triple digits in the North County but remain mild in the coastal valleys and along the beaches.

Cooler conditions will come Wednesday as an upper-level trough sweeps across the Central Coast. This system has the potential to produce showers and isolated thunderstorms across the Northern California mountains. Unsettled weather continues Thursday as another trough will transition across the state with the potential to produce widespread showers, especially in the mountains, as far south as Monterey Bay.

The main effect along the county coastline will be moderate gale-force to fresh gale-force (32- to 46-mph) afternoon northwesterly winds, late-night and morning marine low clouds with areas of drizzle and cooler temperatures starting Wednesday and continuing through Sunday.

Today’s surf report

Today’s strong to gale-force (25- to 38-mph) northwesterly winds will generate a 5- to 7-foot northwesterly (320-degree, deep-water) sea and swell (with a 4- to 9-second period) this afternoon through tonight, increasing to 6 to 8 feet with the same period Tuesday into Wednesday. Rough indeed!

Moderate gale-force to fresh gale-force (32- to 46-mph) afternoon northwesterly winds will continue to generate a 5- to 7-foot northwesterly (320-degree, deep-water) sea and swell (with a 4- to 8-second period) Thursday through Sunday.

Today’s 1- to 2-foot Southern Hemisphere (180-degree, deep-water) swell (with a 15- to  17-second period) will remain at this height through Tuesday, decreasing Wednesday.

Seawater temperatures

Seawater temperatures will be between 52 and 54 degrees through Tuesday, decreasing to 51 and 53 degrees by Wednesday, and are expected to remain at this level through Sunday.

John Lindsey's Weekly Forecast is special to The Tribune. His Weather Watch column appears in the Local section Sundays. Contact him at pgeweather@pge.com.

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