SLO County weather forecast for the week of March 4

March 3, 2013 

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

Gentle to moderate (8- to 18-mph) northeasterly (Santa Lucia) winds will produce dry and fair conditions today as a transitory ridge of high pressure moves over the Central Coast.

A low-pressure system will drop south out of the Gulf of Alaska and slowly move toward San Luis Obispo County through Tuesday, delivering persistent northwesterly winds, night and morning low clouds and fog, and cooler temperatures.

The associated cold front will move over the Central Coast on Wednesday with moderate to fresh (13- to 24-mph) southeasterly winds and widespread rain showers. Cold and unstable air behind the front will produce the potential for thunderstorm activity.

Snow levels will start out near 5,500 feet and fall to near 3,500 feet by Wednesday night. Overall, this does not look like a major rainmaker, with only about 0.25 to 0.50 inches expected for Wednesday.

New snow accumulations are likely to range from 6 to 8 inches across the central and southern Sierra.

A chance of rain showers and afternoon thunderstorm activity will continue along the Central Coast, along with snow in the Sierra, through Thursday.

Beginning Friday, a high-pressure ridge will build over the western United States, signaling a return to dry and mild conditions across San Luis Obispo County through the weekend. Unsettled weather is then set to return toward the middle of the following week.

Today’s surf report

Today’s 4- to 6-foot northwesterly (305-degree deep-water) sea and swell (with a 7- to 20-second period) will become a 4- to 6-foot northwesterly (295-degree deep-water) swell (with an 11- to 18-second period) Tuesday. This northwesterly (295-degree deep-water) swell will further increase to 7 to 9 feet (with an 11- to 16-second period) Wednesday and remain at this height and period through Thursday.

Strong to gale-force (25- to 38-mph) northwesterly winds will produce a 5- to 7-foot northwesterly (310-degree deep-water) sea and swell (with a 7- to 18-second period) along our coastline Friday through Saturday.

A higher-energy west-northwesterly (290-degree deep-water) swell is forecast to arrive along our coastline March 10 and 11.

Seawater temperatures

Seawater temperatures will range between 51 and 53 degrees through Tuesday, increasing Wednesday.

John Lindsey’s Weekly Forecast is special to The Tribune. His Weather Watch column appears in the Local section on Sundays.

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