June 28, 2019 – Temperatures gradually warm the next several days, returning to around average by the end of the weekend. Slight chance of late- day thunderstorms over portions of the Coast Range, otherwise dry weather.
Discussion
Large area of mid and high clouds continues as mid-level jet ahead of the eastern Pacific trough remains overhead NorCal. Current temperatures range from the 40s to lower 50s in the mountains to the lower to mid 60s across the Central Valley.
Gradual warming is expected across the region the next few days as the trough slowly weakens. Highs today will still be around 5-10 degrees below average for late-June, but will return to around average by Sunday.
A thunderstorm or two may develop later today across the Coast Range as a short-wave pivots onshore, otherwise dry weather is forecast into next week.
Extended Discussion (Tuesday through Friday)
The synoptic pattern favoring an upper trough across the Pacific Northwest continues with residual lower heights sitting over the West Coast. While the ensembles agree on a trough in a more or less weakened state, the 00Z ECMWF solution would favor a more impressive closed off low. If this were to verify, below average temperatures would be possible. However, it is just one possibility so will support the ensemble systems here which keeps readings closer to climatology for early July.
The general pattern ahead will feature nearly clear skies accompanied by onshore flow with no chances for any precipitation. Valley highs from Sacramento southward should be in the low 90s with mid/upper 90s more likely across the northern Sacramento Valley. Escape from the warm weather can be found in the mountains as highs stay in the 60s and 70s.