Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 200952

Area Forecast Discussion
National Weather Service Sacramento CA
252 AM PDT Sat May 20 2017

Dry and very warm the next several days. NorCal`s first triple
digit heat possible early next week. A chance of Sierra showers
and isolated thunderstorms early next week.


.Discussion (Today through Tuesday)...
Strong Pacific upper level ridge has built over NorCal with dry
and very warm conditions. Temperatures continue to march toward
the upper 90s and triple digits Sunday into Tuesday in the Valley.
The hottest temperatures of the season thus far will be felt on
Monday and people are encouraged to follow heat safety tips
during outdoor activities. Isolated thunderstorms should form over
Sierra southward of Lake Tahoe area Sunday and Monday.

A detached upper disturbance will creep northward, offshore of
central CA, may produce an expanded chance of thunderstorms over
the Sierra on Tuesday. This will also trigger an increased Delta
Breeze that will cool the Delta-influenced areas.   JClapp


High pressure weakens by mid-week as trough gradually deepens
over the PacNW. The result will be cool down in temperatures
across interior NorCal to around average or below as onshore flow
continues. Enough moisture and instability may linger for a few
late day showers and thunderstorms over the mountains on
Wednesday, otherwise dry conditions are expected. &&

VFR conditions the next 24 hours. Southwest winds 10-15 kts in
and near the Delta, otherwise winds less than 10 kts at TAF sites.


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