SLO County California weather forecast: rain, then clear skies

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Southern sea otters swim in the rain.

All eyes of the weather community were on a storm with hurricane-force winds that rapidly intensified as it moved east across the southern Gulf of Alaska, from 989 millibars to 943 millibars Saturday.

This storm had an explosive development and was therefore classified as a “bomb cyclone”. A low pressure system must drop 24 millibars in 24 hours to be classified as a weather bomb.

The associated cold front is expected to tap into subtropical humidity and take on atmospheric river characteristics (AR) as it heads towards northern California with heavy rain on Sunday.

Precipitation totals expected in northern California will vary by more than 5 inches in the northern coastal mountains and northern / central Sierra Nevada; 3 to 5 inches in the lower elevations of the Sacramento Bay and Valley area.

The ECMWF and GFS models continue to indicate that this intense cold front, reinforced by strong high altitude winds, will cross the central coast from Sunday evening to Monday morning.

This storm is expected to produce moderate to gale force southerly winds (32 to 46 mph with gusts to 60 mph) and between 1 and 3 inches of rain in San Luis Obispo County. The Santa Lucia Mountains above Cambria could see up to 4 inches.

The strongest winds and the heaviest rain are expected to occur between 2 a.m. and 6 a.m. Monday with the frontal passage. This system will produce several feet of snow in the Sierra Nevada above 8,000 feet.

Wind advisories were issued for the Coast Range from 11 a.m. Sunday until 11 a.m. Monday, with highways 41, 46 and 33 particularly at risk, according to the National Weather Service.

In the wake of the cold front, strong to gale force northwest winds (25 to 38 mph) and clear skies are expected Monday evening through Tuesday. Wind gusts from Santa Lucia (from the northeast), clear skies and warmer temperatures are expected Wednesday through Friday. In fact, high temperatures could reach lows – 80 in coastal valleys and along beaches by Thursday.

Surf report

A 5 to 7 foot northwest swell (290 degrees, deep water) (with a period of 8 to 13 seconds) is forecast along our coast on Sunday morning. Gale force southerly winds along the central California coast will generate southerly seas of 5 to 7 feet (180 degrees, shallow water) on Sunday afternoon, reaching 10 to 12 feet Sunday evening through early Monday morning.

These seas will be followed by a westerly swell of 10 to 12 feet (280 degrees, deep water) (with a period of 18 to 20 seconds) later Monday morning, increasing to 13 to 15 feet (with a period 15 to 17 seconds) from Monday afternoon to Tuesday morning. This swell will diminish to 9 to 11 feet (with a period of 13 to 15 seconds) Tuesday afternoon and overnight.

A 6 to 8 foot northwest swell (300 degrees, deep water) (with a period of 7 to 17 seconds) is forecast along our coast from Wednesday to Thursday.

Sea water temperatures will vary between 56 and 58 degrees until Thursday.

This week’s temperatures

BOTTOMS AND TOPS, PASO ROBLES

SUN

MON

MAR

SEA

GAME

FRI

SAT

SUN

52, 67

59, 63

39, 67

42, 71

45, 75

45, 77

45, 72

46, 76

MINIMUM AND HEIGHT, SAN LUIS OBISPO AND COASTAL VALLEYS

SUN

MON

MAR

SEA

GAME

FRI

SAT

SUN

54, 67

57, 63

48, 70

52, 76

52, 80

49, 77

48, 73 49, 70

PG&E Security Council

With oak trees heavily laden with acorns and stressed from well below average rains last season, fallen limbs and other debris are expected from Sunday night through Monday morning’s storm.

Never touch downed power lines. Get away from the lines and keep others away from them.

Immediately call 911 to report the location of an interrupted line. After reporting the line failure, call Pacific Gas and Electric Co. toll-free at 800-743-5000.

John Lindsey is PG&E’s Diablo Canyon marine meteorologist and media relations representative. Email him at [email protected] or follow him on Twitter @PGE_John.

This story was originally published 24 October 2021 9:00 a.m.

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