Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
The strong area of high pressure responsible for the recent stretch of well above-average temperatures in the inland valleys has weakened as an upper-level trough of low pressure develops off the West Coast. This condition is expected to produce a deeper and more persistent marine layer, resulting in robust cooling in the North County.
The deeper marine layer will create areas of dense fog with pockets of mist and drizzle during the night and morning hours along the beaches, coastal valleys and perhaps a few spots in the inland valleys. The low clouds will clear back to the shoreline during the afternoon hours; however, the beaches may remain mostly overcast through the day.
Monday’s high temperatures will range from the mid-90s in Paso Robles to the mid- to high 70s in Santa Maria and Lompoc.
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A brief and modest warming trend will occur in the North County on Tuesday as temperatures rise a degree or two. Otherwise, little change in this typical summerlike weather pattern is expected through Friday. Temperatures are forecast to drop to below-normal levels near the coast as a low-pressure system approaches the Central Coast through the first weekend in August.
This system is expected to produce fresh to strong (19- to 31-mph) northwesterly winds during the afternoon hours Wednesday into Friday, which will produce a greater amount of clearing along the coastline during the late morning and afternoon hours.
The stretch of fair, dry and seasonal weather then looks to continue into the second week of August; however, an upper-level low may entrain subtropical moisture the following week, increasing humidity levels and bringing partly cloudy skies.
Monday’s 3- to 5-foot northwesterly (315-degree, deep-water) swell (with an 8- to 11-second period) is forecast to remain at this height and period through Tuesday, increasing to 4 to 6 feet with the same period Wednesday into Saturday. A 1-foot Southern Hemisphere (200-degree, deep-water) swell (with a 19- to 21-second period) will arrive Wednesday, increasing to 1 to 3 feet (with a 15- to 17-second period) Thursday and Friday.
Seawater temperatures are projected to range between 54 and 57 degrees through Monday, increasing to 56 to 59 degrees Tuesday into Thursday.
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This week’s PG&E safety tip: Lightning from thunderstorms kills an average of 49 people in the United States each year, and hundreds more are severely injured. There is no safe place outside when thunderstorms are in the area. If you hear thunder, you are likely within striking distance. Just remember: When thunder roars, go indoors.
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