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Northern CA Forecast Discussion
FXUS66 KSTO 292127 AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
127 PM PST Mon Nov 29 2021

SYNOPSIS...
Cool mornings with local fog in the Valley and mild afternoons expected over the next week. Dry weather continues. Locally breezy north to east winds Tuesday through early Wednesday.


.DISCUSSION

... Clear skies are being observed this afternoon across interior Northern California under continued high pressure conditions. A weather system moving to the east tomorrow will push the high pressure ridge axis west back over the eastern Pacific, lowering heights and tightening surface pressure gradients somewhat over Northern California. This will cause winds to shift offshore and become locally breezy. Northerly wind gusts up to 15 to 25 mph will develop tomorrow in the Sacramento Valley. Northeast to east wind gusts will then increase over the foothills and mountains tomorrow evening through early Wednesday, with gusts up to 20 to 30 mph, locally up to 40+ mph near wind prone gaps, canyons, and ridgetops. High pressure then shifts back east over California Wednesday, prevailing through the rest of the forecast period. Patchy fog is possible in the late evening and morning hours most day through the forecast period. Temperatures will be above normal, especially Tuesday and Wednesday due to the offshore winds. This week, Valley and foothill temperatures will range from mid 60s to 70s, nearing upper 70s in the northern Sacramento Valley Tuesday and Wednesday. Mountain temperatures will be in the 50s to 60s. -HEC


.EXTENDED DISCUSSION

(Friday THROUGH Monday)... No significant changes to the extended forecast. High pressure remains the dominant synoptic feature through most of the extended forecast period. This will result in dry weather with above normal high temperatures Friday through Sunday. Upper ridge forecast to retrograde offshore Monday, as short wave trough moves into NorCal bringing of a chance of widespread, but mainly light, precipitation.








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