NZUS96 KMTR 262134
LLLMTR

Preliminary Local Storm Report
National Weather Service San Francisco CA
234 PM PDT Mon Aug 26 2024

SYNOPSIS

Warm up underway with above average temperatures through mid-week. Minor-to-moderate 
HeatRisk Tuesday and Wednesday. Slight cooling as temperatures trend towards normal 
for the second half of the week. 

SHORT TERM

Marine layer making a gradual return as of this morning after being effectively mixed 
out by the trough over the past few days. This will lead to gradually increasing cloudiness 
along the coastal areas, and offer the usual protection from the warm up that will be 
going on inland. On that note, temperatures a bit warmer today than yesterday, as expected, 
and will lead us into the next couple of days of further warming. Expecting a bit more cloudiness 
and patchy fog overnight tonight along the coast as the subsidence aloft compresses the marine layer. 

LONG TERM

A few more degrees of warming Tuesday and Wednesday, when the peak heat is expected. Mostly minor 
HeatRisk with some isolated areas of moderate for inland urban areas. At this time, no advisories 
or warnings will be posted given that the heat is expected to be relatively short-lived and not 
on the extreme end of above average. Generally we are looking at about 5-8 degrees above average 
across inland areas. By late Wednesday into Thursday, a progressive trough is progged to sweep through 
the PNW which would flatten the ridge slightly and bring some downward modulation to our temperatures. 
This trend is expected to continue through the weekend and into Labor Day where cluster analysis 
advertises a continuation of the progressive pattern with another trough affecting northern and central 
CA. This pattern will bring temps back down to around normal for much of the area by the weekend, perhaps 
a couple of degrees above. The longer term outlook from the Climate Prediction Center features an area 
of hedging towards above normal precip for the region, but this is likely picking up on the trough pattern 
that would deepen the marine layer and bring drizzle to coastal and upslope locations.

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