Here is this week’s weather forecast by PG&E meteorologist John Lindsey.
High pressure is expected to rebuild over California on Monday and shift inland Tuesday. This condition will produce moderate to fresh (13 to 24 mph) and at times gusty Santa Lucia (northeasterly) winds Monday morning. These winds will push the marine layer out to sea. Except for variable mid to high-level clouds from the northwest, hazy to mostly clear skies and warm weather will develop throughout the Central Coast. Monday’s high temperatures will reach the high 80s in the North County and coastal valleys while the beaches will warm to the mid- to high-70s. Tuesday will be a transitional day to unsettled weather, as marine low clouds with areas of mist and drizzle develop Tuesday evening and night.
Considerable uncertainty still exists regarding the development of a low-pressure system off the California coast on Wednesday through Thursday. The system will tap into some remnant moisture from former Hurricane Olaf and may generate some rain showers over San Luis Obispo and northern Santa Barbara counties, with elevated terrain having the highest probability to see some precipitation Wednesday into Thursday. Lower elevations could see a few sprinkles or some stray showers. Given the mild nature of the system, snow levels will remain generally above 8,000 feet. The main affect of this low-pressure system could be moderate gale-force to fresh gale-force (32 to 46 mph) northwesterly winds, with gusts to 55 mph, along the coastline, and high sea and swell Thursday afternoon into Friday.
High pressure will then build over the area by Saturday, with temperatures returning to above-normal for the trick-or-treaters. Cooler conditions could then return Sunday into the following week as a weather system passing to the north and will act to weaken the ridge of high pressure.
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Monday’s 6- to 8-foot northwesterly (300-degree, deep-water) sea and swell (with a 4- to 12-second period) will decrease to 4 to 6 feet (with a 7- to 14-second period) on Tuesday.
Hurricane Olaf is forecast to take an unusual track and move toward California from near Hawaii. If the numerical weather models verify, a 7- to 9-foot southwesterly (245-degree, deep-water) swell (with an 11- to 15-second period) from Hurricane Olaf could arrive along our coastline Wednesday morning and afternoon.
A 9- to 11-foot west-northwesterly (285-degree, deep-water) swell (with a 13- to 18-second period) is forecast to arrive along the Central Coast on Wednesday evening into Thursday morning. Moderate gale-force to fresh gale-force (32 to 46 mph) with gust to 55 mph northwesterly winds along the coastline will generate an 11- to 13-foot northwesterly sea and swell (with a 5- to 14-second period) Thursday evening into Friday. An 8- to 10-foot (300-degree, deep-water) swell (with an 8- to 20-second period) is forecast along our coastline Saturday, decreasing Sunday.
Arriving from the Southern Hemisphere
Monday’s 2- to 4-foot Southern Hemisphere (220-degree, deep-water) swell (with a 16- to 18-second period) will remain at this height but with a gradually shorter period through Tuesday.
Seawater temperatures will range between 61 and 65 degrees through Thursday morning, decreasing to 56 and 60 degrees Thursday afternoon into Saturday.
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At PG&E, your safety is our first concern. If it rains this week, be especially careful; after a long dry period, the first rain releases oil and grease that has accumulated on our roadways, creating slippery conditions. Please, slow down and give yourself extra time to reach your destination. Driving too fast is the No. 1 cause of accidents on wet days.
John Lindsey’s Weekly Forecast is special to The Tribune. His Weather Watch column appears in the Local section on Sundays. Contact him at firstname.lastname@example.org.
A LOOK AT THIS WEEK’S TEMPERATURES
LOWS AND HIGHS, SLO AND COASTAL VALLEYS
LOWS AND HIGHS, PASO ROBLES