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September 17, 2018 – Below average temperatures continue early this week, then warmer weather returns for the second half of the week. Patchy smoke and haze will continue, mainly over Shasta County.

Discussion

Clear skies and mostly light winds across the region early this morning. Current temperatures are mainly a little milder compared to 24 hours ago and range from the 30s in the mountain valleys to the 50s to lower 60s across the Central Valley. The weak upper trough will linger early this week maintaining slightly below average temperatures. Ridging from the eastern Pacific is forecast to build into the region by mid-week resulting in warmer temperatures along with turning flow to the north. Portions of the Central Valley will see highs return into the lower to mid 90s Wednesday and Thursday.

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Extended Discussion (Friday through Monday)

Stable flow aloft gives way to a disturbance towards the weekend into early next week. Near normal temperatures Friday, but temperatures will drop to the cooler side of normal as cooler air associated with the upper disturbance moves into NorCcal this coming weekend. Precipitation for the Coastal mountains cannot be ruled out at this time, but chances are looking slim at this time.