Weather

SLO County weather forecast for the week of July 18

John Lindsey
John Lindsey dmiddlecamp@thetribunenews.com

Here is this week’s weather forecast by PG&E meteorologist John Lindsey.

A weakening area of high pressure over the desert Southwest combined with a developing trough of low pressure along the West Coast is expected to continue to produce mild temperatures and a deep and persistent marine layer with areas of night and morning low clouds, fog and drizzle in the coastal regions. Monday’s high temperatures are expected to range from the 60s along the beaches, the mid-70s in the coastal valleys to the low 90s in the North County.

High pressure is forecast to build back over the Central Coast on Tuesday into Saturday, resulting in increasing northwesterly winds and a greater amount of clearing along the beaches. In fact, mostly clear skies are forecast along the shoreline Thursday into Saturday, as gale-force northwesterly winds along the coastline mixes out the marine layer. This condition will produce a warming trend throughout the Central Coast. High temperatures at the Mid-State Fair will warm to the high 90s on Wednesday and Thursday, further heating to the low 100s on Friday into Saturday.

»» Find out what’s new at this year’s Mid-State Fair.

The coastal valleys will reach the low to mid-80s on Wednesday into Saturday. The highest temperatures in the coastal valleys will occur during the late morning hours, before the northwesterly winds bring cooler marine air through the coastal valleys, passes and gaps during the afternoon. The beaches will range from the low to mid-60s, except for the southwesterly facing beaches of Cayucos, Avila Beach and Shell Beach, which should reach the low 80s.

The warming trend could last through next week, as the high pressure centered over the desert Southwest strengthens. However, the long-range models do maintain a weak trough of low pressure off the Pacific Northwest, which will likely maintain the marine influence for locations near the coast. At this time, there is no indication of any monsoonal moisture for San Luis Obispo County.

Surf report

Monday’s 4- to 6-foot northwesterly (300-degree, deep-water) sea and swell (with a 7- to 9-second period) is forecast along our coastline into Tuesday morning. Strong to gale-force (25- to 38-mph) northwesterly winds are expected to produce 4- to 6-foot northwesterly (310-degree, shallow-water) seas (with a 5- to 7-second period) Tuesday afternoon and will remain at this height and period through Thursday, increasing to 5 to 7 feet with the same period Friday into Saturday.

A 1- to 2-foot Southern Hemisphere (200-degree, deep-water) swell (with a 15- to 17-second period) is expected along our coastline Monday into Thursday.

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This week’s PG&E safety tip: Summer is here, which means lots of fun in the sun. Nevertheless, the weather can get extremely hot and quickly go from fun to dangerous. Extreme heat can be life threatening, so learn what extreme heat is and how you can protect yourself. Visit www.pge.com for summer safety tips.

John Lindsey’s Weekly Forecast is special to The Tribune. He is PG&E’s Diablo Canyon Power Plant marine meteorologist and a media relations representative. Contact him at pgeweather@pge.com. Follow him on Twitter @PGE_John.

This week’s temperatures

LOWS AND HIGHS, PASO ROBLES

MON

TUE

WED

THU

FRI

SAT

SUN

51 90

53 94

54 97

55 98

56 100

57 102

57 100

LOWS AND HIGHS, SLO AND COASTAL VALLEYS

MON

TUE

WED

THU

FRI

SAT

SUN

53 75

54 78

55 81

56 81

56 86

56 85

56 84

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