Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 272200
Area Forecast Discussion
National Weather Service Sacramento CA
300 PM PDT MON JUN 27 2016
Hot and mainly dry weather this week. A few late day thunderstorms
possible mid-week over the higher Coastal Range and near the
Sierra crest south of Tahoe.
Interior NorCal sandwiched between upper ridging over the
Intermountain West and upper troughing in the EPAC. Strong
subsidence over NorCal resulting in high temperatures running 10
to 15 degrees above normal. Triple digit heat will cover the
Central Valley again today with most areas topping out around
105 degrees F.
Delta breeze is weak but will trend up afternoons and evenings.
Marine layer is quite shallow and thus will have very little
cooling impact inland. Highs near the Delta will trend down 2 to
4 degrees each day through Thursday. In the Southern Sacramento
Valley, only a 1 to 3 degree drop is forecast each day with highs
continuing to reach the century mark into Thursday.
NAM12 continues to showing increasing afternoon instability and
PWS over the Coastal Range Tuesday into Thursday to support a
slight chance of showers and thunderstorms. Weak instability
depicted over southern portions of our higher Sierra Nevada with
increasing mid level moisture Tuesday into Thursday to support a
slight chance of deep moist convection there.
Weak upper troughing increases through midweek into Thursday.
This will increase onshore flow and provide minor synoptic
cooling in vicinity of the Delta. Central Valley will continue to
see 3 digit high temps with the foothills and mountains also
remaining well above normal.
.EXTENDED DISCUSSION (Friday THROUGH Monday)
An approaching shortwave trough of low pressure Friday and
through the weekend will bring some relief to the hot temperatures
across the valley. Although the main upper level feature will move
across the Pacific Northwest, temperatures will gradually cool
into the weekend. High temperatures Friday will reach the upper
90s to low 100s while valley temperatures Sunday will fall closer
to normal into the low to mid 90s. Temperatures for the foothills
and higher elevations will continue to be in the 70s and 80s for
the long term forecast period. No significant chances for
precipitation are expected at this time.
VFR conditions expected for the terminals during the next 24 hour
period. Light wind shifts are expected for the Sacramento area and
in the northern valley overnight.