Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 180354
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
854 PM PDT Wed May 17 2017

.SYNOPSIS...
Dry with a warming trend forecast for the rest of this week.
NorCal`s first triple digit heat possible early next week.

&&
.DISCUSSION...
High pressure will build stronger over the region each of the
next several days. Northerly winds will continue in the valley
through Friday with easterly winds in the mountains at night and
in the morning. Winds may reverse direction in the valley
Saturday. The most noticeable warmup will occur on Friday when
temperatures will warm into the 90s in the central valley.
Saturday should have only slight warming over Friday`s highs.
The mountains will warm into the mid 60s to upper 70s for
Friday with warming into the 70s to mid 80s for Saturday.

.PREVIOUS DISCUSSION...
High pressure ridging expected into next week as NorCal has dry
weather with warming temperatures. For the short term forecast,
daytime highs will increase about 5-10 degrees on Thursday and
again on Friday as the high pressure ridge strengthens. Valley
highs today should reach the mid to upper 70s then warm into the
mid 80s on Thursday and low 90s by Friday. For higher elevations,
highs today are forecast to be mid 40s to mid 60s, then range mid
50s to mid 70s on Thursday with 60s to low 80s by Friday. On
Saturday, the ridge won`t strengthen much so daytime highs will
only be a few degrees warmer than Friday`s highs. By the end of
the week, max temperatures in our CWA will be 8-14 degrees above
normal.

Continued warming expected so anyone spending time in the NorCal
valley should pay close attention to heat safety tips to prevent
heat illness. Stay hydrated, don`t exert yourself outside in the
afternoon hours when temperatures are hottest, wear light colored
clothing and use sunscreen. Make sure pets, elderly, and children
are not left in hot cars. Another important point is to avoid
mountain rivers and streams this weekend if you`re looking to cool
off. Mountain snow melt will make these water ways very swift and
very cold. Hypothermia can set in quickly which can cause
drownings. Stay safe in hot weather!  JBB

&&
.EXTENDED DISCUSSION (Sunday THROUGH Wednesday)

High pressure will bring mainly dry weather into next week.
Temperatures will be increasingly warm, and are expected to peak
early next week. Triple digits are possible Sunday over the
northern Sacramento Valley, though projections have trended down
some with recent model runs. A low pressure trough over the Great
Basin along with a weak low off the southern California coast will
undercut the ridge. Monday and Tuesday highs have a little better
chance of reaching around 100 for the northern Sacramento Valley.
There could be some Delta flow bringing some cooler air for the
southern Sacramento and northern San Joaquin Valley, especially on
Tuesday, so Monday is expected to have the peak temperatures for
the week there.

There should be enough instability in the high Sierra for a few
afternoon/evening showers and thunderstorms to form near and
south of Lake Tahoe through Wednesday. EK

&&

.AVIATION...

VFR conditions expected at all of the TAF sites for the next 24
hours.

&&

.STO WATCHES/WARNINGS/ADVISORIES...
None.
&&

$$



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