NATIONAL WEATHER SERVICE FORECAST DISCUSSION
Area Forecast Discussion
Issued by The National Weather Service
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610
FXUS66 KSTO 202056
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
156 PM PDT Thu Jul 20 2017

.SYNOPSIS  
Hot and dry weather continues with locally breezy conditions. Hotter weather for the weekend.
.DISCUSSION (Today through Sunday)  
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 the area. 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 Tuesday.
.AVIATION 
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 Delta ovngt.
.STO   WATCHES/WARNINGS/ADVISORIES    
Excessive Heat Watch from late Friday night through Sunday evening for Northeast Foothills/Sacramento Valley-Northern Sacramento Valley.
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