Area Forecast Discussion
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FXUS66 KSTO 220907

Area Forecast Discussion
National Weather Service Sacramento CA
207 AM 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 will drift northward
during the day. We will still have predominately easterly flow
aloft so activity that starts in the mountains 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 through the day and
tonight. This will help to keep inland temperatures fairly cool
today for this time of year. 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

A low pressure area centered to our northwest will not only help
to keep an enhanced Delta breeze but may help to keep some showers
overnight on Tuesday in the mountains.

On Wednesday we 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 2 to 4 inches of
snow across the peaks looks possible. There should be an increase
in shower activity as that low moves closer and through the
region Friday and Friday night.



A low pressure area will be passing through during the morning
hours and into Nevada in the afternoon on Saturday. Colder air
associated with the low may bring some snow down around pass
levels but at this time the amount of precipitation is minimal so
not expecting much at or below pass levels. The precipitation
should be winding down Saturday night as the low moves further to
the east. Behind the system northerly winds will develop and
temperatures will be warming up to between 85 and 95 for most
valley locations with 90s possible both Monday and Tuesday of next



Showers and thunderstorms are expected once again over the
western slopes and will continue through the evening. The activity
may spread into the central and northern Sacramento valley mainly
this evening. Local MVFR/IFR conditions possible in storms.
Otherwise, mainly VFR conditions over interior NorCal next 24
hours with a chance of stratus spreading into the Sacramento
region after 10Z with cigs between 800-1200 ft deep. Gusts 30 to
35 kts in Delta until 12z Wednesday, Winds mainly staying less
than 15 knots at TAF sites.



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