SLO County weather forecast for the week of April 28

Special to The TribuneApril 27, 2014 

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

A significant warming trend will start today and continue through Thursday as a strong ridge of high pressure builds over the West Coast. This ridge will warm the Central Coast in two ways: First, the atmosphere will warm due to subsidence (sinking or downward motion of air) and plenty of sunshine. Second, this high-pressure system will produce increasing Santa Lucia (northeasterly) winds. This offshore flow will warm by compression as it descends down the Santa Lucia mountains into the coastal valleys and beaches of San Luis Obispo County.

This condition will result in the warmest weather of the season.

The Santa Lucia winds will reach their peak Tuesday morning with wind gusts of 40 mph near the Estero Bay area, especially along Highway 41 from Morro Bay High School heading toward Atascadero about halfway up the grade.

Also the coastal canyons and parts of eastern San Luis Obispo, including Cal Poly, San Luis Obispo High School and French Hospital Medical Center, will also experience gusty winds.
These winds will produce low relative humidity levels, clear skies and warm afternoon air. Temperatures will warm 10 and 15 degrees on Tuesday. The warmest days will be Wednesday and Thursday, when temperatures across the North County are expected to reach the low 90s while the beaches and coastal valleys will experience highs in the low to
upper 80s. Warm indeed!

Strong to gale-force (25- to 38-mph) northwesterly winds will start Friday and will continue through Sunday. These onshore winds will allow the marine low clouds and fog to redevelop along the coastline and stream inland during the night and morning hours, producing much cooler conditions throughout San Luis Obispo County.

Today’s surf report

An 8- to 10-foot northwesterly (300-degree, deep-water) sea and swell (with a 6- to 15-second period) will arrive along our coastline this afternoon and will remain at this height and period through Tuesday morning. This swell will decrease Tuesday afternoon and night.
A 4- to 6-foot northwesterly (305-degree, deep-water) swell (with an 8- to 13-second period) will develop along the shoreline Wednesday, further lowering to 3 to 5 feet (with an
8- to 12-second period) by Thursday.

Strong to gale-force (25- to 38-mph) northwesterly winds along the California coastline will generate a 4- to 6-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 11-second period) Friday, increasing to 5 to 7 feet with the same period Saturday through Sunday. 

Seawater temperatures

Seawater temperatures will range from 49 to 51 degrees through Sunday.  

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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