SLO County's freezing nighttime temps may start to inch upward

Special to The TribuneDecember 9, 2013 

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

Weather report

An upper-level disturbance out over the Pacific will spread high-level clouds over San Luis Obispo County through this morning.

A very strong 1,040 millibar high-pressure system over the Great Basin combined with a 1,019 millibar surface low off Point Conception will produce fresh to strong (19- to 31-mph) Santa Lucia (northeasterly) winds this morning. These winds will be especially strong, with gusts to 45 mph 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.

These winds will combine with high-level clouds to keep most of the coastal regions above the freezing point. However, most of the North County will drop into the 20s. These Santa Lucia winds will not be as strong Tuesday morning. Consequently, overnight minimum temperatures will be cooler in the coastal regions, with a few coastal locations reaching the freezing point. 

Looking ahead, daytime temperatures will gradually increase through the week, approaching near-normal levels by the weekend. Overnight temperatures will also slowly increase, on the order of a degree per day, but likely remain below freezing for most North County locations at least through Thursday.

A low-pressure system will produce increasing clouds Thursday into Friday, but at this time, no rain is expected. The increased cloud cover will produce warmer overnight temperatures Friday morning. The warming trend will continue through the weekend with temperatures remaining near normal for late autumn.

Today’s surf report

Today’s 3- to 5-foot northwesterly (315-degree deep-water) swell (with an 8- to 15-second period) will remain at this height but with the gradually shorter period through Tuesday.
A 2- to 4-foot northwesterly (310-degree deep-water) swell (with a 7- to 12-second period) is forecast along our coastline Wednesday, decreasing to 2 to 3 feet (with a  7- to
15-second period) by Thursday.

A 4- to 6-foot northwesterly (310-degree deep-water) sea and swell (with a 5- to 14-second period) will develop along our coastline Friday and remain at this height and period through Saturday.

A relatively strong storm is expected to develop near the international dateline Wednesday. An 8- to 10-foot west-northwesterly (295-degree deep-water) swell (with an 18- to 20-second period) is expected to arrive along our coastline Sunday.

Seawater temperatures

Seawater temperatures will range between 53 and 55 degrees through Sunday.

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

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