Area Forecast Discussion
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FXUS66 KSTO 261108

Area Forecast Discussion
National Weather Service Sacramento CA
408 AM PDT Sat May 26 2018

Scattered showers and isolated thunderstorms this evening across
the area. Afternoon and evening thunderstorms possible mainly over
higher terrain into next week. Cooler than normal temperatures
continue across most of the region through Saturday, warming to
well above normal for early next week.


Closed upper level low continues to drop south and east. A band of
light precipitation is currently located from around Winters
extending northeast through Yuba City through Oroville to Lassen
National Park. Precipitation amounts range from a few hundredths
in the Valley to around a tenth of an inch in the mountains. This
band will continue to slide southward through the morning,
bringing light rain showers/sprinkles down to around the I80
corridor in the Valley before dissipating. Precipitation will
continue in the mountains and foothills through the afternoon in
the form of showers, with thunderstorms looking unlikely in a more
stable environment. Latest snow levels from profilers at Chico,
Oroville, and Colfax are at about 8500 feet. Some light snow
accumulations are possible through the morning, probably an inch
or so.

Dry and warming weather is expected in the Valley and Delta with
decreasing clouds. Highs will be much warmer, in the mid 70s to
near 80 over the northern Sacramento Valley.

An upper level ridge will build into California Sunday into
Monday, bringing a rather dramatic warming trend. By Memorial Day,
high temperatures will be in the mid to upper 90s across the
Valley. This could bring a moderate heat risk, mainly to sensitive
groups like infants and the elderly. Tuesday looks just slightly
cooler as the ridge flattens slightly ahead of an approaching
approaching trough. 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. EK


An upper level trough moves in Wednesday, bringing cooler, near
normal temperatures and isolated high mountain thunderstorms.
Drier and somewhat warmer weather returns for late in the week. EK



MVFR/IFR will continue for the northern terminals with generally
VFR for the southern terminals. OVC/BKN 1000 to 3500 feet in the
north Sacramento Vallery through 18z, then improving to VFR
BKN050. A band of light rain showers in the Valley this morning
dimishes as it reaches around KSMF, with skies clearing in the
afternoon. Winds are expected to remain 10 knots or below. EK



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