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025
FXUS66 KSTO 262200
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
300 PM PDT Sat May 26 2018

.SYNOPSIS...
Warming to well above normal for early next week. Afternoon and evening
thunderstorms possible mainly over higher terrain starting on
Tuesday. Another cool down is expected for middle to late next
week.

&&

.DISCUSSION...
Latest satellite imagery indicates a closed upper low continuing
to push east of the forecast area. Radar returns indicate that
precipitation activity has remained east of the forecast area this
afternoon, though a few isolated showers could still develop near
the Sierra crest. Afternoon temperatures are running 5 to 10
degrees warmer compared to yesterday`s.

Ridge of high pressure builds across interior NorCal Sunday into
Monday. This should result in stable conditions and above normal
temperatures across the area. Temperatures on Sunday expected to
be in the mid 80s to low 90s across the Valley. A few showers could
be possible over the far southeastern corner of the forecast area
on Sunday, although thunderstorms appear to be unlikely in a more
stable environment. Memorial Day is expected to be the warmest
day with daytime highs in the mid to upper 90s across Valley.
This could bring a moderate heat risk for sensitive groups
including infants and the elderly.

Models show the ridge flattening on Tuesday ahead of an approaching
upper level system. This will lead to slightly cooler
temperatures on Tuesday, although there could still be a moderate
heat risk for sensitive groups. There is a slight chance of
afternoon and evening thunderstorms over the northern Sierra crest
south of I80, and over eastern Shasta County and Lassen National
Park.

&&

.EXTENDED DISCUSSION (Wednesday THROUGH Saturday)
A series of disturbances in the extended forecast will keep
temperatures below average for this time of year. Chances for
mountain showers and thunderstorms possible, mainly during
afternoon hours.

&&

.AVIATION...
Skies will continue to clear as upper disturbance slides out of
the area. VFR conditions are expected for the next 24 hours with
chances for breezy conditions for the northern Sacramento Valley.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$




Previous Forecast Discussions may be found at
NWS Sacramento, CA (STO) Office Forecast Discussions.
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