Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 262205

Area Forecast Discussion
National Weather Service Sacramento CA
305 PM PDT Thu Apr 26 2018

Isolated shower/thunderstorm possible over the higher terrain
this afternoon into evening. Cooling with an increasing chance and
areal coverage of showers and afternoon thunderstorms Friday into
the weekend. Threat of mountain showers/thunderstorms lingers
into early next week.


Cu/TCU developing over the higher elevations of the Western Plumas
mountains and Sierra Nevada this afternoon. NAM 3KM showing
isolated storms developing later this afternoon into evening near
the crest. Afternoon temperatures across Interior NorCal running
about 3 to 9 degrees cooler with greatest change observed in the
Southern and Central Sac Valley. Delta breeze is moderate to
strong this afternoon and will continue similar strength this

Closed upper low is forecast to gradually shift inland Friday into
the weekend with low center tracking across Oregon. Increased
synoptic forcing and instability will result in higher probability
of mountain showers and thunderstorms. Threat also extends into
portions of the Central Valley and foothills with best chances in
the afternoon and evening from around KCIC northward. Strongest
cells look to occur over northern portions of the CWA, closer to
low center. Enhanced onshore flow and synoptic cooling will
result in high temperatures dropping about 5 to 15 degrees Friday
into the weekend. Coolest day looks to be Saturday with highs
expected in the 60s for the Central Valley, with 40s to 50s for
the mountains and foothills.



Large scale upper level disturbance will begin shifting east
Monday, but another fast moving shortwave trough will dive
southward along the coast to continue to bring chances for
mountain showers and isolated thunderstorms and cooler weather
across interior northern California. Afternoon high temperatures
Monday will be slightly below normal, but will rebound to near to
slightly above normal by the middle of next week.


VFR conditions for the terminals over the next 24 hours with
increasing high level clouds. Local IFR conditions possible near
the Bay / Delta region during the morning hours, and isolated
thunderstorms are possible over the high Sierra this afternoon.



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