NATIONAL WEATHER SERVICE FORECAST DISCUSSION
Area Forecast Discussion
Issued by The National Weather Service
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375
FXUS66 KSTO 222231
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
331 PM PDT Sun Jul 22 2018

.SYNOPSIS...
Hot weather returns this week, peaking mid week. Potential for
isolated thunderstorms in the mountains continues through
midweek.

&&

.DISCUSSION...
Onshore flow a little cooler start to this morning, but
temperatures this afternoon are about the same as yesterday.
Temperatures will end up about the same by late this afternoon,
near normal levels. Monsoonal moisture has spread thunderstorms
into the northmen Sierra into Lassen National Park/Plumas County
and far eastern Shasta County. These will continue into early
evening. Most of the stronger storms are expected to remain east
of the crest. Some mountain thunderstorms are possible in the
northern Sierra through midweek, followed by drier conditions late
this week.

A fairly strong upper ridge will bring above average temperatures
across interior NorCal this week. The northern Sacramento Valley
could likely remain in the 105-109 range through Thursday. The
southern Sacramento could remain in the mid 90s to around 100 due
to onshore flow, which could limit the potential for significant
hot temperatures. Thus, have cancelled the Execessive Heat Watch
for that area. In addition to the northern Sacramento Valley, the
central Sacramento Valley and northern San Joaquin Valley,
adjacent foothills, and central Shasta County will be impacted by
heat enough for a Heat Advisory to be issued for Tuesday afternoon
through Thursday evening. EK

&&
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)

Upper level ridge axis continues to retrograde through the
extended period. However, flow becomes more zonal over NorCal
Thursday into early weekend, allowing for continued onshore flow
and not much fluctuation in temperatures. Daytime temperatures
expected to remain in the upper 90s to near 108 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. HEC
&&

.AVIATION...

VFR conditions the next 24 hours. Isolated thunderstorms possible
higher terrain 22Z-03Z. Southwest winds 15-30 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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