Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
High pressure is expected to continue to build in the upper levels of the atmosphere over California, while a weak and nearly stationary 1,011-millibar surface low-pressure system will develop west of Monterey Bay.
This condition will continue to produce gentle to moderate (8- to 18-mph) westerly (onshore) winds along the coastline Monday into Thursday, resulting in a strong temperature inversion layer. There will be plenty of marine low clouds and fog with pockets of mist and drizzle in the coastal regions of San Luis Obispo and Santa Barbara counties during the night and morning hours.
Along the beaches, only partial afternoon clearing is expected. In other words, May Gray/June Gloom will be in full bloom along the immediate shoreline.
Temperature differences between the North County and the beaches could be greater than 40 degrees. By Thursday and Friday, maximum temperatures will range between the mid- to high 90s and perhaps the first 100-degree readings this year in the North County. The coastal valleys are expected to range between the high 60s and low 70s, while the beaches will remain in the high 50s to mid-60s.
A weak upper-level low-pressure system is forecast to move down the California coastline Friday into Sunday. The system is expected to produce gentle to moderate (8- to 18-mph) southerly winds.
At this time, this upper-level low may also entrain subtropical moisture from the south, which would lead to increasing mid- to high-level clouds, increasing humidity levels and the chance of rain showers and thunderstorms Saturday into Sunday. Nevertheless, it will probably be quite muggy this weekend.
Monday’s 3- to 5-foot northwesterly (310-degree, deep-water) swell (with an 8- to 11-second period) is forecast to remain at this height and period through Sunday.
Arriving from the Southern Hemisphere: A 1- to 2-foot Southern Hemisphere (185-degree, deep-water) swell (with an 18- to 20-second period) will arrive along our coastline Monday, increasing to 2 to 3 feet (with a 15- to 17-second period) Tuesday.
This Southern Hemisphere swell will further build to 3 to 5 feet but with a gradually shorter period on Wednesday into Friday. These longer-period Southern Hemisphere swells often produce strong rip currents.
Seawater temperatures will range between 54 and 57 degrees through Thursday, increasing to 56 and 60 degrees Friday into Sunday.
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It’s looking hot this week in the North County, so follow these PG&E safety tips:
▪ Avoid strenuous activities in hot, direct sunlight.
▪ Drink plenty of water, and avoid alcohol or caffeine.
▪ Pay attention to your body. Muscle cramps, dizziness and nausea may be signs of a heat-related illness.
John Lindsey’s Weekly Forecast is special to The Tribune. He is PG&E’s Diablo Canyon 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