Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 030429
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
929 PM PDT WED SEP 2 2015
Below average temperatures the remainder of the week as a weather
system moves into the region. Showers and thunderstorms are
possible across the northern portion of the state Friday into
early Saturday. Milder conditions return for the latter portion of
the Labor Day weekend into next week.
A trough of low pressure is centered over the State of Washington
and British Columbia. The trough will continue to deepen over the
area through Friday to bring cooler than normal temperatures to
the area...80s valley to mainly upper 60s to mid 70s for the
mountains for Thursday. Friday looks like it will be the coolest
day this week with some upper 70s possible in the valley and 50s
and 60s for the mountains.
This trough does not look like it will bring widespread
precipitation to most of the interior at this time with models
indicating some isolated showers possible over northwestern
Shasta County, northern coastal range and near Lassen Park for
Thursday. As the central part of the trough deepens over the area
on Friday and Friday night it will bring the best chance of
showers and isolated thunderstorms to the northern third of the
forecast area but in the mountains some light precipitation may
make it down to near I-80 late at night. Snow levels will lower
enough over the northern mountains that Lassen Park may get a
dusting of snow Friday night. Instability looks pretty good for
Friday as the system moves through so some thunderstorms will be
possible during the day and evening hours.
The trough will likely generate breezy conditions at times into
Friday especially over the ridges and through the delta.
Saturday the trough will move to the northeast with northerly
winds over the interior. This will start a warming trend but
temperatures are still expected to stay below normal for this
time of year.
.EXTENDED DISCUSSION (Sunday THROUGH Wednesday)
Dry weather with a gradual warming trend is expected early next
week as the upper trough shifts eastward and high pressure slowly
returns. There may be a period of locally breezy north winds
Sunday through Tuesday. Temperatures by the middle of next week
will likely be a bit warmer than normal.
VFR conditions expected the next 24 hours. Stratus may spread
through the Delta into Sacramento area TAFs between 12-17z
Thursday morning. South to west winds 10-18 kt with gusts to 25
kt across the Valley will diminish late this evening.