Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
A classic Central Coast summertime weather pattern will persist through Wednesday morning, with plenty of marine low clouds, fog and pockets of mist and drizzle. Apart from coastal stratus clouds, skies are expected to remain clear across San Luis Obispo County, with cooler weather expected through the holiday. The cooling is thanks to a weak upper-level trough that will help to keep temperatures near- or below-normal through the Fourth of July toward the middle of next week.
It will also contribute to some thunderstorm development along the Sierra Nevada during the afternoon and evening hours, with most of the development remaining along and to the east of the Sierra crest. Monday’s high temperatures will range from the mid-80s in the North County to the mid-70s in the coastal valleys. The beaches will range between the high 50s and low 60s.
Coastal low clouds are expected to develop during the Fourth of July firework shows; however, the base of these clouds should be high enough to still allow for a nice viewing of the firework displays. Fireworks are made to burst at different heights, depending on the size of the shell and how the fireworks are packed. Most firework displays along our coastline reach altitudes from a few hundred to 1,000 feet.
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»» For a list of Fourth of July events in SLO County on Monday, click here.
Northwesterly winds are set to increase along the coast Wednesday afternoon into Sunday, producing much more sunshine along the beaches. In fact, the winds may be strong enough to mix out the marine layer by the weekend. Temperatures will begin to rise back to near-normal by the weekend. No extreme heat is expected at this time.
A 3- to 5-foot northwesterly (305-degree, deep-water) swell (with an 8- to 11-second period) is forecast along our coastline Monday into Wednesday morning. Increasing northwesterly winds along the coastline will produce a 4- to 6-foot northwesterly (315-degree, deep-water) sea and swell (with a 5- to 9-second period) on Wednesday afternoon through Thursday, increasing to 5 to 7 feet with the same period on Friday into Sunday. Arriving from the Southern Hemisphere: Monday’s 2- to 3-foot Southern Hemisphere (190-degree, deep-water) swell (with a 14- to 16-second period) will gradually decrease Tuesday.
Tropical Storm Blas, several hundred miles west-southwest of Baja California, will move west-northwestward and strengthen. Southerly (190-degree, deep-water) swell from this cyclone is expected to reach the Central Coast on Friday at 1 to 3 feet (with a 13- to 15-second period), building to 3 to 5 feet (with a 12- to 14-second period) and will shift out of the southwest (220-degree, deep-water) by Saturday.
Seawater temperatures are forecast to range between 52 and 55 degrees through Sunday.
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This week’s PG&E safety tip: This week’s southerly swell will produce strong rip currents along many of our 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, as “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 marine 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