Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
This high-pressure ridge over the western United States has compressed the marine layer like a marshmallow down to near 1,000 feet at the coast. The marine layer is expected to clear back to the shoreline later Monday morning; however, only partial afternoon clearing is expected along many of the beaches. The exceptions will be Cayucos, Avila Beach and Shell Beach, which will clear during the afternoon hours. Monday’s high temperatures are forecast to range from 97 degrees in Paso Robles to 79 degrees in San Luis Obispo. The beaches’ temperatures will range from the high 50s to the mid-60s.
The numerical models continue to indicate southwesterly winds will continue in the inland areas, including the Nacimiento Lake area, through Friday. These winds are expected to push smoke from the Chimney Fire toward the northeast and away from the coastal valleys and beaches of San Luis Obispo County. Santa Margarita, Atascadero and most of Paso Robles should also remain mostly clear.
A persistent marine layer along the coast will bring varying amounts of night and morning low clouds and fog with pockets of mist and drizzle to the beaches and coastal valleys, where temperatures should stay at normal levels. In the North County, temperatures will continue to reach the high 90s from Tuesday through Wednesday.
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Monsoonal moisture is expected to stream northward Thursday into Saturday and will spread mid- and upper-level clouds into the Central Coast, triggering higher humidity levels and perhaps some sprinkles for a few Central Coast locations. Afternoon thunderstorms are likely across the Sierra Nevada and Tehachapi Mountains. The details at this time remain uncertain and will need to be monitored closely going forward.
Monday’s 3- to 4-foot northwesterly (310-degree, deep-water) sea and swell (with a 7- to 14-second period) will remain at this height and period through Tuesday. A 3- to 5-foot northwesterly (300-degree, deep-water) swell (with a 5- to 13-second period) is forecast along our coastline Wednesday, increasing to 4 to 6 feet (with a 7- to 12-second period) on Thursday into Friday. This swell will decrease to 3 to 4 feet (with an 8- to 11-second period) on Saturday into next Sunday. A 1- to 2-foot Southern Hemisphere (200-degree, deep-water) swell (with a 16- to 18-second period) will arrive Wednesday, increasing to 2 to 3 feet (with a 15- to 17-second period) Thursday into Friday.
Seawater temperatures are projected to range between 53 and 56 degrees through Tuesday, increasing on Wednesday into Friday.
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This week’s PG&E safety tip: Get ready for natural disasters before they happen. Discover how you and your family can prepare for emergencies by visiting www.pge.com/safety.
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