| Day | Date | High/Low | Forecast |
| Mon | 2nd | 72/59 | Mostly sunny day with some afternoon high clouds. Mostly clear evening. |
| Tue | 3rd | 75/60 | Sunny day. Clear evening. |
| Wed | 4th | 75/60 | Sunny day. Clear evening. |
| Thu | 5th | 79/62 | Mostly sunny day with some high clouds. Some evening high clouds. |
| Fri | 6th | 83/64 | Sunny day. Clear evening. |
Synopsis
High pressure aloft has developed over the West Coast today. A weak, marginal, off-shore has promoted minor to modest, daytime warming (compared with yesterday). A little more warming is anticipated tomorrow west of the mountains, but the off-shore flow shouldn’t get strong enough to greatly suppress ocean breezes near the coast (relevant off-shore flow wind restricted to higher elevations). If a passing, upper air trough to our north moves inland more quickly than the computer models forecast, a return to weak, on-shore flow may happen. In that case, daytime temperatures should actually be a little cooler than it gets today in the coastal plain (may not be noticeable farther inland). Regardless of how quickly the trough moves eastward, all the precipitation associated with the trough should remain over the northern third of the state (just a minor storm).
High pressure should start to re-build over the western states in the second half of the week. By this weekend, high pressure should be firmly in place over the state. A return of off-shore is expected, but no widespread, significant wind in Santa Ana wind prone areas is anticipated…at this time. Assuming deep layered off-shore flow develops, widespread 80 degree weather is likely (including some beach locales). Unless high pressure aloft winds up stronger than forecast, no 90 degree weather is anticipated (might be close though in a few spots).
High pressure aloft should weaken and start sliding eastward by Tuesday next week. A number of model solutions show a trough developing along the West Coast around the middle of next week (cooler weather). There is a distinct chance of wet weather sometime in the latter half next week for northern California. The case is less certain for widespread, wet weather reaching southern California (at least, based on today’s model consensus). Even if wet weather in the Southland develops as some model solutions show, none project a major storm (weak to modest system). As is usually the case with longer range forecasts, confidence in any one scenario is relatively low.
Time permitting, a forecast and synopsis may follow on Friday, 6 November.