Placerville, CA (near 1,850 ft. elevation - 95667)

Wx Discussion - Wx Hazards - Wx Special Statements

Expanded Placerville Weather Forecast

Weather Forecast Discussion

000
FXUS66 KSTO 252201
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
301 PM PDT Mon May 25 2020


.Synopsis...
High pressure will continue to build over the region with dangerous
heat this week. The hottest days will be Tuesday through Thursday
with moderate to high heat risk expected. A pattern change is
expected on Friday, which will lead to cooler temperatures and
chances of mountain showers and thunderstorms over the weekend.

&&

.DISCUSSION...
Minimal changes were made to the forecast this afternoon as high
pressure continues to build over the region. Today is the start of
the unseasonably warm weather with 2PM Valley temperatures
spanning the upper 80s to mid 90s. Expect highs for the Valley to
peak in the mid to upper 90s, while the foothills peak in the mid
80s to mid 90s and the mountains range from the mid 60s to the mid
80s. A few areas have a chance at cracking the century mark in
the Valley today, with widespread triple digit heat expected
Tuesday through Thursday. Overnight lows are not expected to
provide much relief from the heat during this period, as the only
fall into the 60s for the Valley and low to mid 70s for the
foothills. Thus, the Excessive Heat Warning for elevations below
3500 feet remains in effect through 7PM Thursday.

With the prolonged heat in the forecast, the general population
should take precautions to prevent heat related illnesses given
the potential for moderate to very high heat risk. Stay hydrated,
limit outdoor activities, and check on sensitive groups.

If you plan on enjoying the outdoors, be sure to practice heat
safety and a cold water safety if visiting area waterways. Area
waterways continue to run very cold and fast, and precautions
should be taken if heading to the water.

&&
.EXTENDED DISCUSSION (Friday THROUGH Monday)...

A potent mid-level low over the subtropical Pacific will
eventually be a pattern changer heading into the weekend. Much of
the time beforehand the system should spend in a quasi-stationary
state, spinning south of 30N latitude. Some gradual
intensification of this low center is expected as it drops to
around 558-dm as it crosses just west of San Diego midday Friday.
Relative to typical late May climatology, height anomalies will
run around 2 to 3 standard deviations below average. The leading
edge of this feature should gradually introduce some additional
cloud cover which will shave several degrees off the previous
day`s temperatures. Delta influenced locations can anticipate the
most notable changes relative to earlier in the week. On Friday,
locations around the Delta can expect highs in the mid 80s with
low 90s around the Greater Sacramento region. Increasing moisture
aloft should aid in the development of some showers over the
higher terrain.

Drastic changes are in store over interior northern California
this weekend. While there is high confidence in the return of near
to slightly below average temperatures to finish out the month,
the overall impacts will be dependent on the timing and strength
of the upper low. Given decent moisture transport with this
southerly track, instability will be a bit more widespread than
usual. Showers and scattered thunderstorms will be possible on
Saturday, especially over the mountains. However, some of these
could easily impact sections of the Sacramento Valley as well.
Given convection is difficult to predict 5 days out, check back
in the days ahead for updates on this aspect of the forecast.

To finish out the weekend, some lingering showers are likely across
the higher terrain as the upper low exits into the interior
Pacific Northwest. Ensembles do show an elgonated longwave trough
over the east Pacific which maintains cool, and potentially
unsettled conditions into next week. Valley highs are expected to
stay in the upper 70s to low 80s which is roughly 4 to 8 degrees
below average. ~BRO

&&

.AVIATION...

VFR conditions over Interior NorCal the next 24 hours with
surface winds generally below 12 knots.
&&

.STO WATCHES/WARNINGS/ADVISORIES...
Excessive Heat Warning until 7 PM PDT Thursday for Carquinez
Strait and Delta-Central Sacramento Valley-Motherlode-Mountains
Southwestern Shasta County to Western Colusa County-Northeast
Foothills/Sacramento Valley-Northern Sacramento Valley-Southern
Sacramento Valley.

Excessive Heat Warning until 7 PM PDT Thursday for Northern San
Joaquin Valley.

Excessive Heat Warning from 7 AM to 7 PM PDT Thursday for Shasta
Lake Area / Northern Shasta County.

&&

$$

Hazardous Weather Outlook

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