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SLO County weather forecast for the week of July 24

Valencia Peak is shrouded in fog.
Valencia Peak is shrouded in fog.

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

An upper-level trough of low pressure over Northern California will produce a persistent marine layer along the beaches and gentle to moderate (8 to 18 mph) westerly winds along the coast today into Tuesday. Conditions will cool Monday and will remain cooler than normal through Wednesday.

Monsoonal moisture will move into Southern California and will promote thunderstorm development over the Sierra Nevada, but isolated thunderstorms are also possible in the elevated terrain of eastern San Luis Obispo and Santa Barbara counties. Thunderstorm chances will continue into Tuesday. Monday and Tuesday’s temperatures will be in the 60s at the coast, mid-70s in the coastal valleys and mid-80s in the inland valleys.

Temperatures will rise back to above normal levels by Thursday into the weekend with the inland valleys reaching triple-digits levels.

Surf report

A 2- to 4-foot northwesterly (300-degree, deep-water) swell (with an 8- to 11-second period) is forecast on along our coastline today into Tuesday, decreasing to 2 to 3 feet with the same period Wednesday into Sunday.

Arriving from south: The Eastern Pacific region remains active with three tropical cyclones: Greg, Irwin and Hilary. Tropical Storm Hilary is forecast to become a major hurricane off the coast of Baja California and move in a northwesterly direction.

Southeasterly (160-degree, deep-water) swell from this cyclone will arrive along the Southern California coastline Friday and peak Sunday at 7 to 9 feet (with a 14- to 16-second period) with sets of waves reaching well over 14 feet. Along the Central Coast, this southerly swell will arrive Friday at 1 foot (with a 15- to 17-second period), building to 1 to 2 feet (with a 14- to 16- second period) Saturday and peaking at 2 to 3 feet with the same period Sunday.

Seawater

Temperatures will range between 51 and 54 degrees through Monday, increasing to 54 and 57 degrees Tuesday into next Sunday.

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At PG&E, the safety of our customers and employees is our top priority. Each year in the United States, more than 400 people are struck by lightning. There is no safe place outside in a thunderstorm. Remember, “when thunder roars, go indoors!”

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 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

56 86

52 87

53 94

55 98

57 101

56 103

58 105

LOWS AND HIGHS, SLO AND COASTAL VALLEYS

MON

TUE

WED

THU

FRI

SAT

SUN

55 76

54 75

54 77

55 80

55 82

56 83

57 89

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