SLO County weather forecast for the week of Sept. 23

pgeweather@pge.comSeptember 22, 2013 

This morning’s Santa Lucia northeasterly (offshore) winds will produce clear skies and warm temperatures throughout San Luis Obispo County on this first full day of fall. Today’s maximum temperatures along the beaches will reach the 70s, while the coastal valleys and North County will hit the high 80s.

Gentle to moderate (8- to 18-mph) Santa Lucia winds Tuesday morning will continue to produce clear skies and warm temperatures.

A change in the weather pattern will develop Wednesday as the upper-level winds (jet stream) will flow directly from British Columbia southward along the western seaboard toward the Central Coast in response to a trough of low pressure. This system will produce moderate gale- to fresh gale-force (32- to 46-mph) northwesterly winds along the coastline and partly cloudy skies. Maximum temperatures will only reach the 70s.

Overnight lows will drop into the low 40s in the North County.

In the Sierra Nevada, snow levels will drop to near 6,500 feet where another dusting of snow may occur by Thursday morning. 

Fair and warmer weather will return by Friday with temperatures warming up into the 70s and 80s. A long a stretch of dry and warm autumn weather will start this weekend and should last through the first week of October.

Today’s surf report

Today’s 3- to 5-foot northwesterly (310-degree deep-water) sea and swell (with a 5- to 11-second period) will continue at this height and period through tonight. 

An 8- to 10-foot northwesterly (315-degree deep-water) sea and swell (with a 5- to 15-second period) will develop along our coastline Tuesday and will remain at this height but with a gradually shorter period through Wednesday. This northwesterly sea and swell will decrease to 6 to 8 feet (with a 7- to 12-second period) Thursday, further lowering to 4 to 6 feet by Friday.

A 3- to 5-foot northwesterly (310-degree deep-water) swell (with an 8- to 11-second period) is forecast along the Central Coast for the Still Frothy Surf Festival in Pismo Beach this weekend. 

Typhoon Pabuk will become extratropical as it moves toward the North Pacific. If this forecast verifies, a long-period northwesterly swell could arrive along our coastline by early October.

Seawater temperatures

Seawater temperatures will range between 52 and 55 degrees through Tuesday, decreasing to 50 and 54 degrees on Wednesday and will remain at this level through Thursday.
Seawater temperatures will start to increase Friday and will continue to warm through the weekend.

John Lindsey’s Weekly Forecast is special to The Tribune. His Weather Watch column appears in the Local section Sundays. Contact him at pgeweather@pge.com.

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