SLO County weather forecast for the week of April 21

A chance of drizzle is in the forecast

Special to The TribuneApril 20, 2014 

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

A cold front is forecast to move southeastward along the California coastline today into Tuesday morning. This low-pressure system is expected to produce decreasing northwesterly (onshore) winds, increasing clouds and cooler conditions throughout San Luis Obispo County. The North County will reach the low 80s, while the coastal valleys will hit the low 70s this afternoon. The beaches will range between the high 50s and mid-60s. 

The trailing edge of this cold front will pass over San Luis Obispo County on Tuesday morning, bringing areas of drizzle/mist and perhaps a few light rain showers. Locations north of Cayucos could record a few hundredths of an inch of measurable precipitation. 

In this system’s wake, a steep pressure gradient is expected to develop along the California coastline. This condition will usher in moderate gale-force to fresh gale-force (32- to 46-mph) northwesterly winds along the California coastline starting Tuesday afternoon and continuing through Thursday. 

Then, another area of low pressure is expected to move through the Central Coast, with possible rain showers late Friday into early Sunday. This system is expected to be followed by another round of increasing northwesterly winds.

Monday’s surf report

A 969-millibar storm developed in the Gulf of Alaska on Saturday, with 65-knot northwesterly winds. This morning’s 8- to 10-foot northwesterly (300-degree, deep-water) swell (with a 16- to 18-second period) from this low-pressure center is expected to decrease to 7 to 9 feet (with a 14- to 16-second period) by Tuesday morning.

Moderate to strong gale-force northwesterly winds will generate an 8- to 10-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 12-second period) Tuesday afternoon and will continue at this height and period through Wednesday.

This northwesterly (310-degree, deep-water) sea and swell will decrease to 7- to 9-feet (with a 7- to 11-second period) Thursday. 

A 5- to 7-foot northwesterly (310-degree, deep-water) swell (with a 16- to 18-second period) will arrive along our coastline Friday, building to 8 to 10 feet (with a 15- to 17-second period) Saturday into next Sunday.   

Arriving from the Southern Hemisphere: A 1- to 2-foot Southern Hemisphere (195-degree, deep-water) swell (with a 20- to 22-second period) will arrive along our coastline Friday, building to 3 to 5 feet (with a 16- to 18-second period) Saturday into next Sunday.

Seawater temperatures 

Seawater temperatures are expected to range from 50 to 53 degrees through Monday, decreasing to between 48 and 51 degrees Tuesday and will remain at this level through Thursday.

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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