Area Forecast Discussion
Issued by The National Weather Service
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FXUS66 KSTO 222054

Area Forecast Discussion
National Weather Service Sacramento CA
154 PM PDT Tue May 22 2018


Afternoon and evening thunderstorms possible mainly over higher
terrain this week. These may extend through the Valley late in the
week. Slightly cooler than normal temperatures continue across
most of the region this week warming to above normal early next



A low pressure area centered over Nevada continues to drift
northward during the day. Easterly flow continues to dominate
aloft, so afternoon mountains activity during the day will be
trying to push towards the valley once again with the best chances
in the valley during the evening hours over the central and
northern Sacramento valley. The Delta breeze is expected to remain
moderate to locally strong this evening and tonight. Temperatures
will remain on the cool side of normal as a result near the delta
influence areas. The only exception will be over the north end of
the valley which will warm well into the 80s. Some stratus will
possibly advect into the valley the next couple of mornings.

Wednesday will still have a decent Delta breeze in place and
temperatures are expected to be slightly cooler across the region.
Unstable air over the mountains will continue with possible
afternoon and evening thunderstorm activity.

The low pressure area to our Northwest will continue to move
closer to the region Thursday and Friday moving through Friday
night. This low will have cooler air associated with it so expect
temperatures to remain below normal for the latter part of the
week and unstable conditions each day. Snow levels may drop to
around pass levels during the day and below Friday night. At this
time though precipitation amounts look light but 1 to 3 inches of
snow across elevations higher than 8000 feet looks possible.
There should be an increase in shower activity as the low moves
closer and through the region Friday and Friday night.



A low pressure system will continue to move east through the area
during the morning hours on Saturday and into Nevada by late
Saturday. Colder air associated with the low may bring some snow
down around pass levels. However, since showers are expected to
be scattered enough to not produce much precipitation, we are not
expecting much snow at or below pass levels at this time. Precipitation
should be winding down by Saturday night as the low moves further
to the east, though could see some lingering mountain showers
through very early Sunday. Behind the system northerly winds will
develop Sunday into Monday. Ridging begins to build early next
week, causing temperatures to rise significantly beginning Sunday.
Most valley locations could see temperatures in the 90s by Monday.



Showers and thunderstorms have formed over the mountains, will
continue through the evening. Local MVFR/IFR conditions possible
in storms. Otherwise, mainly VFR conditions over interior NorCal
next 24 hours except small chance of stratus near Sacramento TAF
sites after 10Z Wednesday. Winds up to 15 kts in the valley with
gusts up to 35kts in Delta. HEC





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