Area Forecast Discussion
Issued by The National Weather Service
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FXUS66 KSTO 181045

Area Forecast Discussion
National Weather Service Sacramento CA
345 AM PDT Wed Oct 18 2017

Dry and mild weather today. Rain chances along with high mountain snow and cooler temperatures Thursday and Friday followed by a warming trend this weekend into early next week.
.DISCUSSION  High cloudiness has shifted further south overnight as west- southwest flow increases ahead of the approaching late-week trough. Winds remain generally light and temperatures are running a bit cooler compared to 24 hours ago across most of the area. Dry weather with mild temperatures will continue across the region today. Highs this afternoon are expected to be very similar to Tuesday`s with lots of lower to mid 80s throughout the Central Valley and surrounding foothills. Unsettled weather still ontrack to return to the region Thursday and Friday with precipitation, much cooler temperatures and gusty southerly winds. The wetter mountain areas may see as much as an inch of liquid precip while the valley will generally see less than a quarter inch and most locales probably just a few hundredths. Colder air behind the frontal band is expected to lower snow levels below the major passes on I-80/US-50 where an inch or two of snow could accumulate. Gusty ridge winds can be expected later Thursday as the upper trof moves inland with a southerly 6-7 mbs RDD-SAC gradient forecast (not as strong as yesterday) leading to gusts around 30 mph or so. Also, chance of a stratus intrusion into the Sac Vly Thu morning ahead of the deepening trof, unless the trof mixes it out beforehand. Warm frontal clouds could return Fri nite with WAA precip mainly staying to our N as strong ridging begins to build for the weekend.
.EXTENDED DISCUSSION  (Sunday THROUGH Wednesday)  Upper ridging over NorCal on Sunday will bring dry and warm weather to the region into midweek. Valley & Delta highs on Sunday will be in the upper 70s to low 80s warming into the mid to upper 80s for Monday and Tuesday. Foothill and Mountain regions will be 60s to 70s on Sunday with foothills warming into the low 80s for the start of the work week. A few degrees of cooling possible on Wednesday when a weak trough could approach NorCal.
General VFR conditions with light winds. Local HZ/FU MVFR visibility is possible in the Delta this morning. Valley winds at TAF sites will be less than 10 kts. Winds over higher terrain will be light with a diurnal pattern.

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