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Area Forecast Discussion (AFD)

Issued by Sacramento, CA (STO)

                            
000
FXUS66 KSTO 222230
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
330 PM PDT Mon Oct 22 2018


.SYNOPSIS...
Dry with a cooling trend to around average high temperatures
Tuesday and Wednesday, otherwise above average through the 
remainder of the week.

&&

.DISCUSSION...
Latest satellite imagery shows an area of low pressure migrating
eastward as a stronger short-wave approaches the PacNW. Current 
afternoon temperatures are running several degrees cooler compared
to yesterday's, with Valley highs in the 70s to low 80s. Minor 
synoptic cooling is expected on Tuesday as upper energy moves into
the Pacific NW. Look for Valley highs in the 70s, with mid 50s to
60s in the mountains on Tuesday. Temperatures will warm a few 
degrees on Wednesday, but will remain near or a few degrees above 
average. Ridge of high pressure rebuilds across interior NorCal 
for the second half of this week, resulting in warmer temperatures
across the region. Daytime highs will be several degrees above 
their climatological normals on Thursday, with Valley highs in the
80s, and 60s and 70s over the foothills/mountains. No 
precipitation is expected through the period.

&&
.EXTENDED DISCUSSION (Friday THROUGH Monday)
Dry and increasingly mild weather is expected for Friday and 
Saturday as upper level ridging develops. A weak system will 
flatten out the ridge to bring some slight cooling for Sunday. Dry
conditions look to continue for most of interior Northern 
California with only the far northern Coastal Range maybe getting 
some light precipitation late Sunday into Monday. The latest 
European has backed off from the previous run on having a deeper 
trough early next week, so will continue to leave out a mention of
precipitation further south. EK 

&&
.AVIATION...
Mainly VFR conditions will prevail over northern California over 
the next 24 hours. This morning some low cloud and fog developed 
over KSMF and KSAC; however, conditions remained in VFR status. 
Tonight, fog and low clouds could develop off the river again, but
the current thinking is that the TAF sites should within VFR 
conditions. 

&&

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

$$