Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 251639
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
939 AM PDT MON JUL 25 2016



.SYNOPSIS...
Cooling today will be brief as widespread triple digit heat
returns to the Central Valley on Tuesday. Daytime highs will
be well above normal through Friday. Cooler next weekend.

&&

.DISCUSSION...
There is a bit of a break in the heat today, relatively speaking,
as a weak upper level trough brings cooler onshore flow. The Delta
breeze has returned and this brought the most cooling. At 9 am, Fairfield
was 10 degrees lower than yesterday at 65 degrees, Sacramento
Executive Airport 8 degrees cooler at 67 degrees. Highs this
afternoon will also be several degrees cooler in the Delta
influenced area, and a couple of degrees lower elsewhere. There
should be a bit of a Delta breeze tonight before the trough begins
to shift eastward.

The lull in heat will be brief as ridging rebuilds and widespread
triple digits return to the Valley and foothills Tuesday afternoon
and continue through the week. The highest temperatures are
expected Wednesday and Thursday. Forecast highs approach record
levels over the northern Sacramento Valley, reaching as high as
111 for Redding. Gradual cooling is expected by late in the week.

Smoke from the Soberanes Fire in Monterey County is spreading
across the northen San Joaquin and southern Sacramento Valleys and
into the foothills and northern Sierra. This is bringing some hazy
skies to those areas. AirNow is forecasting this could also bring
air quality levels that will be locally Unhealthy for Sensitive
Groups (USG) today. EK

&&

.EXTENDED DISCUSSION (Friday THROUGH Monday)

Very hot weather will continue into Friday under strong high
pressure. Some monsoon moisture may make its way up from the
desert and bring a few thunderstorms to the high Sierra Friday.
Model differences arise by next weekend as the ECMWF maintains the
strong ridge across the region, whereas the GFS strengthens a
trough across the Pacific Northwest, bringing some cooling to
NorCal. Our current forecast is a blend of the two solutions.

Dang

&&

.AVIATION...

VFR conditions next 24 hours. Smoke aloft from the Soberanes Fire
near Monterey is being spread over the area from round KMYV south. Winds
generally below 10 knots except gusts to 25 knots in the delta.

&&

.STO Watches/Warnings/Advisories...
None.
&&

$$



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