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October 22, 2018 – Dry with a cooling trend to around average high temperatures Tuesday and Wednesday, otherwise slightly above average through the remainder of the week.

Discussion

More active weather remains well to the south and east of the forecast area with clear skies across interior NorCal. A steady Delta Breeze of around 20 mph continues at Travis AFB, but winds remain generally light elsewhere across the region. Current temperatures range from the 30s in the mountain valleys to the 50s to around 60 across the Central Valley. High pressure will continue over the western states with a weak dry upper level low pressure area over California. Above average temperatures will continue today with only minor cooling for areas influenced by the Delta Breeze. The low will migrate eastward tonight and Tuesday as its kicked out by a stronger short-wave approaching the PacNW. Minor synoptic cooling is expected Tuesday and Wednesday, then warmer and drier conditions, with light northerly flow, will return for the end of the week.

Extended Discussion (Friday through Monday)

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Dry and increasingly mild weather is expected for Friday and Saturday as upper level ridging develops. A weak system will flatten out the ridge to bring some slight cooling for Sunday. Dry conditions look to continue for most of interior Northern California with only the far northern Coastal Range maybe getting some light precipitation late Sunday into Monday. The latest European has backed off from the previous run on having a deeper trough early next week, so will continue to leave out a mention of precipitation further south.