textproduct: San Diego

SYNOPSIS

Isolated showers and breezy west winds in the mountains and deserts diminishing tonight. Warmer and drier through Wednesday followed by brief cooling and another round of breezy conditions in the mountains and deserts on Thursday. Warmer and drier again for Friday into the weekend with periods of weak offshore flow.

DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE

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

Evening update... Isolated light showers remain over the region this evening, ending tonight as the upper level low progresses eastward. West winds gusting to around 25-35 mph in the mountains and deserts will gradually weaken overnight as well. Weak upper level ridging builds in from the west on Tuesday for warmer and drier weather. High temperatures will be as much as 10 to 15 degrees higher than today for inland areas, and around 5 degrees higher near the coast. The building ridge should help re-establish the marine inversion, which was wiped out with the upper low today, for areas of low clouds and fog returning Tuesday night into Wednesday morning over the coastal areas and far western valleys.

Previous discussion... Slight warming with dry and mostly sunny conditions will occur on Wednesday as an area of low pressure tumbles into the Pacific Northwest. This system will traverse the Great Basin by Thursday, ushering in a broad troughing pattern. The system will stay far enough to the north to not provide any major impacts, but high temperatures will be up to 5 degrees cooler with elevated west winds across the mountains and the deserts. Winds will turn offshore late Thursday night into Friday as the system passes further inland, so we will continue to monitor how strong these winds will be which will be dependent on the exact location that this low pressure system goes. Subtle warming looks to occur by the weekend, though a large trough offshore could make things interesting as we head into the latter part of April.

AVIATION

130400Z...Coasts/Valleys...Isolated SHRA ending by 08Z. Otherwise multiple SCT-BKN cloud layers 2500-5000 ft MSL through 15Z, becoming FEW-SCT after 15Z. There is a 40-60% chance of CIGS with bases near 1500 ft MSL developing along the coast and spreading around 15 mi inland after 08Z Wednesday.

Mountains/Deserts...West to southwest winds gusting 25-35 kt through passes and on the desert mountain slopes through 10Z. MOD up/downdrafts over and east of of mountains. Isolated SHRA/SHSN ending by 08Z. Coastal mountain slopes remaining partially obscured in clouds/fog through about 15Z.

MARINE

Northwest winds gusting to around 20 kt in the outer coastal waters near San Clemente Island Thursday afternoon and evening generating choppy conditions.

SKYWARN

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

SGX WATCHES/WARNINGS/ADVISORIES

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