NATIONAL WEATHER SERVICE FORECAST DISCUSSION
Area Forecast Discussion
Issued by The National Weather Service
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760
FXUS66 KSTO 231045
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
345 AM PDT Mon Jul 23 2018

.SYNOPSIS...
Hotter weather returns this week, peaking mid-week. Potential for
thunderstorms in the mountains continues through mid-week.

&&

.DISCUSSION...
Skies have cleared out for the most part following Sunday
afternoon and evening`s moist deep convection over the northern
mountains and Sierra Nevada. Current temperatures are running
about the same as 24 hours ago over most of the area and range
from the lower 50s in the mountain valleys to the mid 80s at the
north end of the Sacramento Valley.

Hotter weather returns to the region this week as upper ridging
extends northward. A brisk southwest breeze continues at Travis
AFB, but coastal profiler day indicates the marine layer is
gradually being squished. This will allow temperatures to
gradually warm across the region through mid-week. Highs across
the northern half of the Sacramento Valley are expected to range
from 105-110 Tuesday thru Thursday. Enough onshore flow thru the
Delta is expected to linger to temper heat across the southern
Sacramento Valley into the northern San Joaquin Valley.

Late-day thunderstorms will be possible along and east of the
northern Sierra Nevada crest and near Mt Lassen the next few days,
followed by drier conditions late this week.

&&

.EXTENDED DISCUSSION (Friday THROUGH Monday)
Upper level ridge axis continues to retrograde through the
extended period. However, flow becomes more zonal over NorCal
through early weekend, allowing for continued onshore flow and not
much fluctuation in temperatures. Daytime temperatures expected
to remain in the mid 90s to near 109 in the valley and 80s to 90s
in the foothills and mountains. The onshore flow will keep
overnight temperatures in the low to mid 60s for most of the
valley, up to the low 70s in the northern Sacramento valley. Dry
conditions expected across the region.

&&

.AVIATION...
VFR conditions the next 24 hours. Isolated thunderstorms possible
higher terrain 22Z-03Z. Southwest winds 15-25 kts with gusts up
to 30 kts near the Delta, elsewhere generally less than 10 kts.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
Heat Advisory from noon Tuesday to 11 PM PDT Thursday 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.

&&

$$
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