| Day | Date | High/Low | Forecast |
| Mon | 21st | 72/62 | Low clouds clearing to a mostly sunny afternoon. Evening low clouds likely. |
| Tue | 22nd | 72/62 | Morning low clouds likely but mostly sunny afternoon. Evening low clouds probable. |
| Wed | 23rd | 73/61 | Low clouds likely but clearing by late morning. Chance of late evening low clouds. |
| Thu | 24th | 74/60 | Chance of early morning low clouds; Otherwise, mostly sunny day. Chance of late evening low clouds. |
| Fri | 25th | 73/61 | Chance of early morning low clouds; Otherwise, mostly sunny day. Chance of late evening low clouds. |
Synopsis
A moderate strength, on-shore flow continues across southern California today. That helped boost the marine layer depth today (coastal eddy also helped). Low clouds reached all coastal valleys (remarkable for late July). Some spotty, morning mist/drizzle occurred in places (not necessarily confined to coastal facing foothills). Low clouds have also persisted over much of the L.A. Basin this afternoon (more so than I expected though why just there, that eludes me).
Needless to say, temperatures are cooler than normal across the whole Southland (large scale, upper level trough along the West Coast helping the cause for interior sections). All the computer models predict only minor day to day changes in the wind flow pattern affecting southern California. A trend toward weaker on-shore flow by midweek should favor a shallower marine layer in coming days (i.e. less extensive low cloud pattern). The aforementioned, upper level trough should also weaken, which should contribute toward a warming trend for most areas (especially well inland locales). At this point, however, most of the models solutions don’t favor any major warming trend this week (maybe back to seasonable levels for well inland areas by this weekend.
Some of the longer ranges models have predicted high pressure aloft expanding westward from the central U.S. next week. As long as the center of high pressure doesn’t come near or over the Southland, much above normal temperatures are unlikely to affect most of the Southland (exception being most desert areas). Even most valleys may not necessarily experience much above normal temperatures next week. It’ll depend on how strong low level, on-shore flow will be. So far this summer, a moderate strength on-shore flow has limited most warm spells when the center of high pressure aloft has been nearby. We’ve been spared (so far) any lengthy heat wave west of the mountains. That may continue into the beginning of August, but there are some model solutions showing heat wave weather coming for well inland areas (after the 2nd). There is also some chance for a “monsoon” moisture incursion into the Southland mountain/desert region (nothing major foreseen at this time). What actually happens remains to be seen.
Next issued forecast/synopsis should be on WEDNESDAY, 30 JULY (not the usual Monday issuance).