textproduct: San Diego

SYNOPSIS

High pressure aloft and weak offshore flow will bring record- setting heat today. A return of onshore flow on Saturday will begin to spread cooling inland but with record-setting heat continuing for many areas on Saturday. The cooling will continue through Monday, but with high temperatures remaining above average. There will be stronger and gusty west winds for Sunday and Monday afternoon and evening for the mountains and deserts with the stronger gusts to 30 to 40 mph. A little warmer and continued dry for Tuesday through Thursday of next week.

SHORT TERM (Today through Sunday)

Satellite imagery shows some high clouds spreading eastward across the area early this morning with the coastal waters free of low clouds. High pressure aloft and weak offshore flow will continue the warming today. High temperatures will continue to warm from those on Thursday with record or near-record high temperatures for most areas today with many areas having high temperatures 20 to 25 degrees above average. High temperatures for today will range from around 80 near the coast to the upper 80s to mid 90s for the valleys and inland Orange County with the lower deserts in the mid to upper 90s.

High pressure aloft will begin to weaken on Saturday with the lower-level flow becoming weakly onshore. That onshore flow will strengthen into Sunday and Monday as a low pressure system moves inland into California and into the Great Basin. Cooling will begin to spread inland into the coast and valleys on Saturday and into most areas on Sunday and Monday with the greater cooling on Monday. Sunday high temperatures will still be around 10 degrees above average near the coast to 15 to 20 degrees above average for inland areas with Sunday high temperatures ranging from the lower to mid 70s near the coast to the lower to mid 80s for the valleys with the lower deserts in the 90s.

Widespread record high temperatures and record warm overnight temperatures are expected for today through Saturday night with the near record high temperatures on Sunday mainly for the mountains and deserts.

LONG TERM (Monday through Thursday)

The low pressure system moving inland through California into the Great Basin will continue the cooling into Monday with gusty southwest to west winds for the mountains and deserts Monday afternoon and evening with the stronger gusts to 30 to 40 mph. Monday high temperatures will range from a few degrees above average near the coast to around 10 degrees above average for the lower deserts. High temperatures on Monday will range from the mid to upper 60s near the coast to the upper 60s to mid 70s for the valleys with the lower deserts in the 80s.

Weak high pressure will follow for Tuesday with a low pressure system moving inland to the north on Wednesday. This system will move toward the southeast after reaching the coast, but with differences on how far south it will go before moving farther east. High temperatures on Tuesday and Wednesday will be a few degrees warmer, then a few degrees cooler on Thursday. NBM shows increasing spread in the high temperature guidance for the coast and valleys for Tuesday through Thursday with the greater spread for the deserts for next Thursday and beyond.

AVIATION

271030Z...Mostly clear and VFR conditions will continue today and tonight.

MARINE

No hazardous marine conditions are expected through Tuesday.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

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