FXUS66 KSTO 210413
Area Forecast Discussion
National Weather Service Sacramento CA
913 PM PDT Thu Jul 20 2017
Hot and dry weather continues with locally breezy conditions.
Hotter weather for the weekend.
Temperatures are running near what they where last night as of
9 PM. Temperatures will cool off to near this morning's lows. The
Delta Breeze will continue through the night before decreasing
but should be similar in strength during the day as today's flow
was through the Delta. Some warming is expected on Friday with
about 1 to 2 degrees of warming for the Sacramento region and up
to about 5 degrees over the north end of the valley. Mountain
areas should warm about 3 to 5 degrees.
Water vapor imagery shows dry southwest flow streaming aloft
across northern California, which is bringing another warm and
sunny day. Visible imagery showed some smoke from the Detwiler
Fire continuing for the Sierra foothills and mountains this
afternoon along and south of I-80. Temperatures across the area
ranged from 92 at Redding to 75 at Blue Canyon.
Forecast continues to be warm and dry with little change to the
southwest flow aloft. Hotter weather returns beginning Friday and
through the weekend as the Southwest high builds westward
bringing synoptic warming and suppressing the marine layer. Highs
Saturday and Sunday will likely make it into the 105-110 range
across the northern Sacramento Valley with overnight lows only
dropping into the lower 70s. An excessive heat watch continues for
Delta winds should keep temperatures cooler for the lower
Sacramento and San Joaquin valleys, but temperatures will still be
somewhat warm ranging between 5 and 10 degrees above normal this
weekend. A very remote chance for an isolated thunderstorm is
possible late Sunday afternoon/evening for the Sierra south of
Highway 50, but confidence is low at this point.
.EXTENDED DISCUSSION (Monday THROUGH Thursday)
Upper low along the NW CA coast Monday will slowly drift inland
resulting in a gradual cooling trend through the middle of the
week. Slight chance of afternoon showers or thunderstorms will be
possible over the higher terrain of the Sierra Nevada Monday and
SWly flow alf with VFR conds ovr Intr NorCal nxt 24 hrs exc isold MVFR
conds poss in smk vcnty of Detwiler Fire in Mariposa Cnty. Lcl SW
sfc wnd gsts to 25 kts poss ovr hyr mtn trrn aftn/eve and thru
Excessive Heat Watch in effect Saturday and Sunday for Northeast
Foothills/Sacramento Valley-Northern Sacramento Valley.
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