Weather Watch

SLO County weather forecast for the week of Dec. 23

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

Weather report

A strong 1,035-millibar Eastern Pacific High firmly anchored off the California coastline will keep the storm track far to the north.

A 1,038-millibar area of high-pressure over the Great Basin will continue to produce night and morning Santa Lucia (northeasterly) winds. These winds will give mostly clear skies with low relative humidity levels. Temperatures this week will remain well above normal, with little day-to-day changes, while overnight temperatures will remain on the cooler side.

The Santa Lucia winds will be especially gusty on Christmas Eve into Christmas Day near Morro Bay High School, coastal canyons and parts of eastern San Luis Obispo, including Cal Poly, San Luis Obispo High School and French Hospital Medical Center. In other words, Santa Claus and his reindeer should have Visual Flight Rules conditions, but with a little turbulence near the mountains. 

A transition to cooler weather will come this weekend, as an area of low pressure will drop southward along the state, bringing cooler temperatures and the potential for increasing Santa Lucia winds. At this time, it appears the system will not result in any precipitation, with some longer range models hinting at continued dry conditions well into January.

Today’s surf report

This morning’s 4- to 6-foot northwesterly (310-degree, deep-water) swell (with a 9- to 16-second period) will decrease to 3 to 5 feet this afternoon into tonight. This swell will further lower to 3 to 4 feet (with an 8- to 14-second period) on Tuesday through Wednesday.

A 960-millibar storm with hurricane force winds developed near the international dateline last weekend.

Forecast forerunners from this huge storm will start to arrive along the Central Coast later Wednesday at 1 to 2 feet (with a 22- to 24-second period). This northwesterly (295-degree, deep-water) swell will build to 4 to 6 feet (with a 19- to 21-second period) on Thursday, peaking Friday into Saturday at 5 to 7 feet (with a 16- to 18-second period), and decreasing by Sunday. 

Seawater temperatures

Seawater temperatures will range between 54 and 56 degrees through Sunday. 

John Lindsey’s Weekly Forecast is special to The Tribune. His Weather Watch column appears Sundays. Contact him at