San Clemente Island CA to Guadalupe Island from 60 NM offshore west to 120W Offshore Forecast
|Tonight...N To Nw Winds 15 To 25 Kt. Seas 5 To 7 Ft.|
|Sun...N To Nw Winds 10 To 20 Kt. Seas 5 To 7 Ft.|
|Sun Night...Nw Winds 10 To 20 Kt, Becoming 10 To 15 Kt. Seas 4 To 6 Ft.|
|Mon...Nw Winds 10 To 15 Kt. Seas 4 To 6 Ft.|
|Mon Night...Nw Winds 5 To 15 Kt. Seas 4 To 5 Ft.|
|Tue...N To Nw Winds 5 To 15 Kt. Seas 3 To 5 Ft.|
|Tue Night...N To Nw Winds 5 To 15 Kt. Seas 3 To 5 Ft.|
|Wed...N To Nw Winds 5 To 15 Kt. Seas 4 To 5 Ft.|
|Wed Night...Nw Winds 10 To 15 Kt. Seas 4 To 7 Ft.|
|Thu...Nw Winds 5 To 15 Kt. Seas 5 To 7 Ft.|
|Thu Night...Nw Winds 10 To 15 Kt, Becoming 10 To 20 Kt. Seas 5 To 9 Ft.|
| 151 PM PDT Sat Sep 19 2020 |
Synopsis for the far southern California coast - PZZ700
At 1 PM, a 1023 mb high was 1000 miles west of Point Conception, and a 1005 mb low was near Needles California. Generally weak northwest flow will prevail through the middle of next week, except locally stronger winds gusting around 20 knots through this evening in the outer waters.
| Area Forecast Discussion|
National Weather Service San Diego CA
843pm PDT Sat September 19 2020
A cooling trend is in progress and will continue into early next as a weak trough develops over the West. A shallow marine layer will keep low clouds and fog patchy and confined to the coastal strip. Much warmer weather returns by the middle of next week as a ridge rebuilds aloft. Above average temperatures may stick with us through next weekend.
FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES... Except for some low clouds forming along the coast, skies were clear. It was significantly cooler this evening, with many sites reporting temperatures running some 5-9F below yesterday at the same time. Onshore flow was better developed today, and this evening strongest winds/gusts of 20-30 MPH were from the SW-W. The 00Z Miramar sounding had significant cooling of 2-4C below 6K FT as well.
Areas of low clouds and patchy fog are expected to return to coastal areas overnight, but burn off quickly on Sunday. The cooling should continue through Tuesday, with gusty afternoon sea breeze winds and patchy low clouds and fog nigheights and mornings near the coast. Much warmer weather returns by midweek as a ridge rebuilds over the region. No forecast updates this evening.
From previous discussion... Long Term
(Tuesday through Friday) A strong area of low pressure in the Gulf of Alaska is expected to trek southeastward toward the Pacific Northwest as high pressure slowly strengthens and nudges its way into the southwestern part of the country. Ensembles continue to depict the area of high pressure winning the battle for a bit, which will bring an increase in temperatures and a shallower marine layer Wednesday into Thursday. Models begin to differ somewhat in where the position of each pressure system will be located by end of the week. The question will be if the trough is strong enough to overtake the ridge or if the high and mighty ridge is able to maintain its presence over SoCal. If the trough is able to push the ridge of high pressure out east a bit, we would see a cooling pattern later next week. Will go with this solution for now given the expected great strength of the Pacific trough with slightly cooler weather as we round out the week. Stay tuned for the latest!
Periods of northwest winds gusting to around 20 kt this evening in portions of the outer waters, mainly near San Clemente Island. Otherwise, no hazardous marine conditions are expected through Thursday.
Humidities in the foothills and mountains will fall to between 15-20 percent through early evening. West and southwesterly gusts primarily 25-35 MPH across the San Bernardinos and High Desert foothills will continue through early evening. Afternoon and evening winds still a bit breezy Sunday and Monday as well with dry conditions, but noticeably cooler. This will bring a lower fire weather threat. Another warm up is in store as we get into Wednesday and Thursday.
.SKYWARN... Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions.
.SGX WATCHES/WARNINGS/ADVISORIES... CA...NONE. PZ...NONE.