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000
FXUS66 KSTO 212037
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
137 PM PDT Sun Oct 21 2018

.SYNOPSIS...
Dry with a cooling trend to near normal high temperatures Tuesday
and Wednesday, then slightly above normal through the rest of the
week.

.DISCUSSION...
High pressure will continue over the western states with a weak
dry upper level low pressure area over California. Above normal
temperatures will continue through Monday with only minor cooling
for Monday. The low will migrate from centered along the coast to
over the Great Basin Monday night and Tuesday as another weak low
over the Pacific drops down from the Gulf of Alaska and into the
Pacific northwest late Tuesday. This should increase flow through
the Delta a little for Monday night and Tuesday and help to keep
temperatures in the 70s for the valley on Tuesday and Wednesday
with 60s in the mountains. Temperatures at night will continue to
cool into the 40s for most valley locations with mid 20s to lower
30s for the mountain valleys.

&&
.EXTENDED DISCUSSION (Thursday THROUGH Sunday)

A weak system will move through the Pacific Northwest on Thursday
with some ridging starting to build over Northern California which
will help warm temperatures a little over Wednesday highs. The
European and GFS are in good agreement and have both shifted any
precipitation north of the area to near the California border with
Oregon. Some better ridging will occur for Friday and Saturday to
bring a warming trend into next weekend. Another weak system
will flatten out the ridge to bring some cooling for Sunday and
Monday. Dry conditions look to continue for the interior with
only the far northwest and north part of the state maybe getting
some light precipitation. The latest European came in with a
deeper trough this morning but will wait another model run to see
if the models can come more in line with each other before
bringing any mention of precipitation further south.

&&

.AVIATION...


VFR conditions will continue for interior northern California
over the next 24 hours. Winds generally below 10 knots.

&&

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

$$