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Local Area Forecast Discussion

000
FXUS66 KSTO 221022
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
322 AM PDT Sun Jul 22 2018

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

&&

.DISCUSSION...
Fair weather across interior NorCal this morning with some
cloudiness streaming across the area. Temperatures as of this
writing are running a few degrees cooler than yesterday given
onshore flow and a Delta breeze. Sunday highs are anticipated to
be in the 90s to low 100s across the Valley, with 70s to 90s over
the foothills and mountains. These forecast high temperatures will
be within a few degrees of normal.

Models continue to show monsoonal moisture spreading northward
today, with afternoon/evening thunderstorm activity developing
over the northern Sierra, and extending into the northern Coastal
Range, as well as near the Lassen Park area and eastern Shasta
county. Some mountain thunderstorms are possible in the northern
Sierra through midweek, followed by drier conditions late this
week.

An anomalous upper ridge will bring above average temperatures
across interior NorCal this week. The northern Sacramento Valley
could likely remain in the 105-108 range through at least
Wednesday. The southern Sacramento and northern San Joaquin
valleys could remain in the mid 90s to around 100 as guidance
continues to suggest onshore flow, which could limit the
potential for significant hot temperatures. Thus, have nudged
temperatures down a few degrees given model trends.

&&

.EXTENDED DISCUSSION (Thursday THROUGH Sunday)
Upper level flow flattens slightly over NorCal Thursday into the
weekend as the ridge continues to retrograde. This will allow
moderating temperatures, though valley temperatures will remain
hot. Onshore flow is expected to continue through late next week
which will help keep overnight temperatures in the 60s near the
Delta region.

&&

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

&&

.STO WATCHES/WARNINGS/ADVISORIES...
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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