| Day | Date | High/Low | Forecast |
| Fri | 5th | 70/60 | Hazy sunshine remainder of day. Evening low clouds likely. |
| Sat | 6th | 69/59 | Low clouds clearing late morning; Mostly sunny with scattered high clouds remainder of day. Evening low clouds likely. |
| Sun | 7th | 68/59 | Morning low clouds; Partial afternoon clearing possible. Chance of evening low clouds. |
| Mon | 8th | 69/59 | Morning low clouds; Mostly sunny afternoon with scattered high clouds. Evening low clouds likely. |
| Tue | 9th | 69/60 | Morning low clouds; Mostly sunny afternoon. Chance of evening low clouds. |
Synopsis
High pressure aloft began to nose into the state a couple days ago. As expected a modest warming for well inland areas followed. The warming trend was mostly minor closer to the coast (none at all for some beaches). A continuing marine layer and not that weak on-shore flow were factors in the muted warming trend (stayed a little cooler at UCLA than I predicted early in the week). Generally speaking, there should be a continuation of minor day to day weather changes in the coastal plain (more noticeable but modest changes for well inland areas).
An upper level trough is forecast to develop over the West this weekend into early next week. On-shore flow should strengthen for a couple days and weaken thereafter (southern portion of the aforementioned trough predicted to weaken, lessening its effects on the Southland). The various, computer models aren’t showing significant day to day changes with the marine layer (through middle of next week). However, the predicted wind flow pattern may support more persistent low clouds west of the mountains on Sunday (confidence not high though), Potentially the campus area may end up a little cooler than I show in today’s forecast.
While my confidence in predicted, weather details remains on the lower side, the weather consequences of being on the wrong side of the forecast should be relatively minor (certainly minor compared with low confidence forecasts in winter). It’s an annual challenge trying to predict weather details by this time of year, especially bouts of “May Gray/June Gloom” weather.
All the longer range models show high pressure aloft strengthening over the Southwest toward the end of next week. If the model consensus is right, high pressure may get strong over the state late next week (lasting at least a few days). There is some potential for widespread, much warmer than normal weather in the state in the second half of the week. However, the extent of warming in the coastal plain (areas near the coast, in particular) remains a little fuzzy. Depending on where the high pressure center resides, the focus of warming may fall on interior sections (i.e. deserts). Such a scenario could support a decent, surface on-shore flow. That, in turn, could support a shallow but defined marine layer (modest warming near the coast while the valleys get toasty). For now, I’m leaning toward the campus reaching 80 degrees over the subsequent weekend (lasting multiple days).
Next issued forecast/synopsis should be on Monday, 8 June.