textproduct: San Diego

SYNOPSIS

A low pressure system off the central California coast will move slowly inland through central and southern California through Tuesday spreading cooling inland with high temperatures on Tuesday 10 to 15 degrees below average for inland areas and 15 to 20 degrees below average for the mountains. Southwest to west winds for the mountains and deserts will gust to 35 to 45 mph with isolated gusts to 60 mph. There is a also chance of showers through Tuesday. The greater chances for showers are for late this evening through Tuesday morning and across San Diego County from the coast to the mountains. It will be dry with a substantial warming trend for Wednesday through Monday of next week. High temperatures on Sunday will be 10 to 15 degrees above average for inland areas to as much as 15 to 20 degrees above average for the inland valleys and lower coastal slopes of the mountains. There could be extreme heat in the lower deserts as early as Saturday and continuing through at least Monday of next week.

SHORT TERM (Today through Wednesday)

A low pressure system off the central California coast will move slowly inland through central and southern California through Tuesday spreading cooling inland with high temperatures on Tuesday 10 to 15 degrees below average for inland areas and 15 to 20 degrees below average for the mountains. Southwest to west winds for the mountains and deserts will gust to 35 to 45 mph with isolated gusts to 60 mph.

There is a slight chance of showers through today from the coast to the mountains. The greater chances for showers are for late this evening through Tuesday morning and across San Diego County from the coast to the mountains. Through Tuesday, rainfall across Orange, southwestern San Bernardino, and western Riverside Counties, rainfall could range from less than one-tenth inch near the coast to one-tenth to locally one-quarter inch in the mountains. For San Diego County, rainfall could range from one- tenth inch near the coast to one-tenth to locally one-third inch in the mountains.

Wednesday will be dry with a substantial warming trend through early next week. High temperatures on Wednesday will warm as much as 12 to 18 degree for the mountains and high desert, but with high temperatures still a few degrees below average for most areas. High temperatures on Wednesday will range from the mid to upper 60s near the coast to the 70s for the Inland Empire with the lower deserts in the upper 80s to around 90.

LONG TERM (Thursday through Sunday)

Substantial warming will continue on Thursday with the warming slowing for Friday through Monday. With the warming, high temperatures for Monday of next week will be as much as 15 to 20 degrees above average for some inland areas. High temperatures for next Monday will range from the 70s near the coast to the 90s to around 100 for the Inland Empire with 105 to 110 for the lower deserts. The Heat Risk based on the NBM forecast would be sufficient for an Extreme Heat Warning for the lower deserts beginning on Saturday and continuing through at least Monday of next week. The Heat Risk for the inland valleys could be sufficient for a Heat Advisory beginning on Monday.

AVIATION

040930Z....Coast/Valleys...Clouds based mostly between 3500-5500 feet MSL will continue today, with occasional cigs to 2500 feet in DZ or -SHRA, most likely in San Diego County. Some higher terrain obscured. Scatter out, not uniform or complete after 18Z, better at the coast and less likely inland especially against foothills. After 00Z, clouds fill the basin again with bases around 2500-3500 feet MSL. -SHRA and local bases down to 1800 feet MSL after 04Z into Tuesday.

Mountains/Deserts...Strong winds will continue to weaken this morning, only to increase again after 21Z. Westerly gusts 25-35 kts with isolated 45 kts, producing moderate to strong up/downdrafts and local LLWS in lee of mountains. Patchy reduced vis in BLDU in deserts. Coast-facing mountain slopes locally obscured between 4000- 6000 feet MSL in BR with clouds intersecting terrain through 18Z, then increasing again after 02Z into Tuesday.

MARINE

No hazardous marine conditions are expected through Friday.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

CA...Wind Advisory from 8 AM this morning to 9 PM PDT this evening for Apple and Lucerne Valleys-San Gorgonio Pass near Banning.

PZ...None.