Showers and a slight chance of thunderstorms will continue through today. There will be additional, mostly light showers for tonight, decreasing and ending from northwest late Friday afternoon. Southwest to west winds along the desert slopes of the mountains will gust to 40 to 50 mph through this afternoon. It will be dry and warmer for the weekend through Monday, then gradually cooler for next week with a chance of precipitation for late next week. Tides will increase over the weekend, remaining elevated through much of next week.
For extreme southwestern California including Orange, San Diego, western Riverside and southwestern San Bernardino counties,
, UPDATED AVIATION DISCUSSION,
(today through Saturday), Rainfall that has occurred across southwestern California since Wednesday afternoon through midnight has been from bands of showers with rainfall quite variable from the coast to the mountains. Some locations have received less than 0.10 inch of rainfall. A lot of areas have had 0.25 inch or less with the generally wetter locations receiving 0.50 to 1 inch. The greatest concentration of heavier amounts has been in the western San Bernardino Mountains in the area around Lake Arrowhead with 1.5 to 2 inches with one report exceeding 3 inches.
Southwest winds have gusted to 45 to 55 mph, mostly along the desert slopes of the San Bernardino County Mountains. Southwest to west winds along the desert slopes of the mountains from the San Bernardino Mountains southwest are expected for this morning through this afternoon with gusts to 45 to 55 mph.
The upper low centered near Point Conception around sunrise today is expected to move toward the northeast and into Nevada this evening. A shortwave moving southward on the west side of the low pressure system is expected to develop into a closed low pressure system centered over southern California late Friday afternoon. This low pressure system will gradually weaken and move toward the east and northeast through the weekend.
Bands of showers with a slight chance of thunderstorms will continue to move inland into southwestern California today. There could be a decrease in showers for early this evening with scattered showers from the west and northwest moving into southwestern California from the west and northwest for later in the evening and overnight. Showers are expected to continue into Friday morning and end from the northwest during Friday afternoon. Dry weather is expected for the weekend.
Additional rainfall for today through Friday for the coast to the mountains of 0.25 to 0.50 is possible. Chances for 0.50 inch or more of rainfall for the coast and valleys is generally 10 to 20 percent with 45 to 55 percent for the San Bernardino Mountains and 30 to 40 percent for the San Diego County mountains.
High temperatures for today will be as much as 10 to 15 degrees cooler than Wednesday for the mountains and inland valleys with high temperatures in the mountains 15 to 20 degrees below average. High temperatures for today will be mostly in the 60s to around 70 for the coast and valleys and for the mountains in the 40s and 50s. High temperatures on Friday will be a few degrees warmer for the coast to the mountains with greater warming of 5 to 10 degrees on Saturday. High temperatures on Saturday will be as much as 5 to 10 degrees below average for the mountains. High temperatures on Saturday will be mostly in the 70s for the coast and valleys and in the 50s and 60s for the mountains with the lower deserts in the lower to mid 80s.
(Sunday through Wednesday), High temperatures for Sunday will be a few to around 5 degrees warmer, mostly in the mid 70s to lower 80s for the coast and valleys, with coastal areas a few degrees warmer on Monday with high temperatures for the coast and valleys in the mid 70s to mid 80s. Cooling will begin to spread inland on Wednesday with high temperatures a few degrees cooler.
221130z, SCT SHRA and isolated TSRA this morning, decreasing in frequency after 15Z, but continuing through about 22Z. Cigs down to 1500-2500 feet MSL and vis 3-5SM at times through 16Z, such as in heavier SHRA or TSRA, otherwise bases will be 3500-4500 feet MSL. Partial obscuration of mountains this morning, but improving vis during the day. Isolated -SHRA after 22Z. Onshore winds in mountains into deserts 25-30 kts, creating MOD up/downdrafts in lee of ridges.
A storm system will slowly move through the coastal waters today through Friday. There is a slight chance of thunderstorms today. Any thunderstorm is capable of producing gusty, erratic winds, choppy seas, lightning, briefly heavy rainfall with reduced visibility, and waterspouts. Isolated northwest wind gusts will occasionally exceed 20 knots Friday. No hazardous marine conditions are expected Friday night through Monday.
Astronomical high tides will create minor to moderate coastal flooding starting Saturday. Tides are 1.4-1.6 feet above predictions. Morning high tides could reach 7 feet Saturday morning and are likely to exceed 7.5 feet by Monday morning.
Ca, Wind Advisory until 6 PM PDT this evening for San Bernardino County Mountains.
Wind Advisory until 6 PM PDT this evening for Riverside County Mountains-San Diego County Deserts-San Diego County Mountains-San Gorgonio Pass near Banning.
Wind Advisory until 6 AM PDT early this morning for Apple and Lucerne Valleys.
PZ, None.
