textproduct: San Diego

SYNOPSIS

Near average temperatures through the weekend with below average temperatures expected next week. Low clouds and fog will be present from the coast to the valleys each night and morning, lingering into the afternoon at times along the coast. Increased westerly winds expected Tuesday through potentially Thursday for the mountains and deserts.

DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE

SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

Temperatures at noon today were running 3 to 5 degrees cooler than this time yesterday along the coast, 6 to 12 degrees cooler in the valleys, and about the same to a few degrees warmer than yesterday in the mountains and deserts. A gradual cooling trend is expected for the weekend into mid-next week which will bring widespread below normal temperatures to the area by Monday.

Prevailing onshore flow will keep areas of low clouds present each night and morning along the coast through the weekend. A weak trough of low pressure will move across the area on Monday. This will result in a deeper marine layer and low clouds throughout the coastal basin. A deeper marine layer is expected to be maintained through the middle of the week. With the increase in onshore flow due to the weak passing trough, it's possible cloudy skies will prevail all day along the coast for early next week.

After the area of low pressure passes early in the week, a potentially deeper upper low is expected to drop into the Pacific Northwest and into the Great Basin Tuesday and Wednesday. There is high confidence that cooler, cloudier, and windier conditions will develop but the details in how cool, cloudy, or windy it will be are still unclear. It's possible the marine layer will be deep enough for areas of drizzle to develop. For next Thursday and Friday the upper level pattern stays unclear with some solutions continuing to show weak troughing with others showing weak ridging.

AVIATION

221700Z...Coast/Valleys...Low clouds will scatter out by 18Z. Low clouds will redevelop and move ashore 01-05Z this evening and fill nearly all the coastal basin overnight into Saturday. Bases will likely be around 1800-2200 feet MSL with tops to 2600 feet. Vis reduced 3-5SM in far inland valleys, and 0-3SM in lower foothills. Scatter out Saturday 17-19Z.

Otherwise, mostly clear and VFR conditions through Saturday morning.

MARINE

No hazardous marine conditions are expected through Wednesday morning.

SKYWARN

Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions.

SGX WATCHES/WARNINGS/ADVISORIES

CA...None. PZ...None.