Area Forecast Discussion
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FXUS66 KSTO 211053

Area Forecast Discussion
National Weather Service Sacramento CA
353 AM PDT Sat Jul 21 2018

Temperatures will gradually decrease this weekend with the
potential for thunderstorms in the mountains. Hot weather returns
next week.



Mainly clear skies prevail across interior NorCal this morning.
Current temperatures range from the low 50s to mid 60s in the
mountains to the mid 60s to mid 70s across the Central Valley.

Near normal temperatures expected this weekend due onshore flow along
with a slightly cooler airmass. Daytime temperatures across the
Central Valley will be in the 90s to lower 100s, with 70s to 90s
over the mountains.

Monsoon moisture along with elevated instability will lead to
mountain thunderstorm activity this weekend. High resolution
guidance suggest showers and/or thunderstorms developing this
afternoon generally south of Lake Tahoe. Thunderstorm activity
will become more widespread across the mountains on Sunday as the
monsoonal moisture spreads northward. Convection over the northern
Sierra could continue through Tuesday, with drier conditions
returning by midweek.

Warmer temperatures return early next week as ridge of high
pressure strengthens and retrogrades westward. Locations over the
northern Sacramento Valley could potentially exceed the century
mark early next week. Meanwhile, onshore flow could limit
significant daytime heating near the Delta-influenced areas with
the latest guidance suggesting mid to upper 90s in the southern
Sacramento and northern San Joaquin valleys. An Excessive Heat
Watch is in effect for the Valley and adjacent foothills Tuesday
through Thursday. This will continued to be monitored over the
weekend, so stay tuned.



Hot weather continue across the region next week as strong high
pressure continues. Warmest portions of the Central Valley will
see highs around 105-110 degrees. Excessive heat watch remains in
effect. Thunderstorm chances will be mainly limited to the Sierra
Nevada south of Lake Tahoe.



VFR conditions the next 24 hours. Isolated thunderstorms possible
northern Sierra Nevada and vicinity Mt Lassen 22Z-03Z. Southwest
winds 15-25 kts near the Delta with southerly winds 10-15 kts
Sacramento Valley 22Z-03Z.


Excessive Heat Watch from Tuesday afternoon through Thursday
evening for Central Sacramento Valley-Clear Lake/Southern Lake
County-Motherlode-Mountains Southwestern Shasta County to
Northern Lake County-Northeast Foothills/Sacramento Valley-
Northern Sacramento Valley-Northern San Joaquin Valley-Shasta
Lake Area / Northern Shasta County-Southern Sacramento Valley-
Western Plumas County/Lassen Park.


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