SLO County weather forecast for the week of May 5

San Luis Obispo - The TribuneMay 4, 2014 

temps

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

An upper-level low-pressure system will move southeastward through California later today into Tuesday. This system will produce coastal night and morning marine low clouds, fog and drizzle, strong to gale-force (25- to 38-mph) afternoon northwesterly winds and cooler conditions. In fact, the North County will only reach the mid-70s, while the beaches and coastal valleys will range from the high 50s to the mid-60s. Rain is possible across the higher terrain of the eastern regions of San Luis Obispo County and likely across the Sierra, where a few inches of snow are expected above 6,000 feet.

This system will exit to the east early Wednesday, leaving behind a steep pressure gradient along the West Coast as a 1,030-millibar Eastern Pacific high nudges closer to California. In other words, batten down the hatches. This gradient will produce moderate gale-force to fresh gale-force (32- to 46-mph) afternoon northwesterly winds along our coastline starting Wednesday and continuing through Saturday. Windy indeed!


A high-pressure ridge is forecast to build over the Central Coast on Sunday into next week for less windy and warmer weather. Temperatures by Sunday should be in the 70s and 80s. The warming trend should continue into early next week.

Strong to gale-force (25- to 38-mph) northwesterly winds will generate a 4- to 6-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 11-second period) today, building to 6 to 8 feet (with a 5- to 14-second period) Tuesday. 
Moderate gale-force to fresh gale-force (32- to 46-mph) northwesterly winds will continue to generate a 6- to 8-foot northwesterly (310-degree, deep-water) sea and swell (with a 5- to 12-second period) Wednesday.

This northwesterly (310-degree, deep-water) sea and swell will decrease to 5 to 7 feet (with a 7- to 11-second period) Thursday, increasing to 7 to 9 feet (with a 5- to
10-second period) Friday into Saturday.

Prolonged northwesterly winds will cause tremendous amounts of upwelling to develop along the coastline, producing the coldest seawater conditions of the year.
Seawater temperatures will range from 50 to 52 degrees through Tuesday, decreasing to 48 and 50 degrees Wednesday through Saturday. 

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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