SLO County weather forecast for the week of Aug. 19 August 19, 2013 

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

A moderately strong, early season upper-level low-pressure system will linger near the Central Coast over the next 72 hours. This system will produce gentle (8- to 12-mph) southwesterly winds along the coast, a deeper marine layer and variable mid- to high level clouds. These conditions will create lower temperatures in the North County and the coastal valleys through Wednesday.

This system will also bring subtropical moisture and instability from the south, leading to a chance of thunderstorms today through Wednesday. The combination of possible lightning and dry fuels brings a threat of new fires. Thunderstorm activity will develop across the central and southern Sierra Nevada with a chance of storm activity across the foothills and lower elevations.

Today’s maximum temperatures will range from the mid- to upper 60s along the coast, mid-70s in the coastal valleys and low to mid-90s across the North County.

A more typical Central Coast summer weather pattern with increasing northwesterly winds will return Thursday and will continue through the weekend.

Surf report

The wind fields have shifted off Cape Mendocino. These winds will produce a 3- to 5-foot northwesterly (300-degree deep-water) swell (with an 8- to 11-second period) along our coast through Wednesday.

Increasing northwesterly winds along the Central Coast on Thursday will generate a 4- to 6-foot northwesterly (315-degree deep-water) sea and swell (with a 5- to 10-second period) along our coast Thursday and will remain at this height and period through Sunday.

A low, long-period, westerly swell from Typhoon Pena is expected to arrive on our coastline Aug. 30.

Seawater temperatures

Today’s northerly (onshore) current will continue to flow northward through Wednesday. This current will produce the warmest seawater temperatures of the year (57 and 61 degrees) and are expected to develop by Tuesday and will continue through 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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