Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 270458
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
955 PM PDT Sun Apr 26 2015
High pressure brings dry conditions through at least mid week.
Above normal temperatures will rule with warmest temperatures on
Monday and slight cooling trend through the end of the week.
Increasing subsidence Mon and Tue will result in unseasonably warm
max temps over interior Norcal next couple of days as a ridge of
high pressure builds over the region. Max temps are forecast to be
about 7 to 17 degrees above normal in the Valley on Mon...and about
6 to 14 degrees above normal on Tue. These anomalously warm
temps are a few-several degrees below record maxes for the next
couple of days at the Valley sites. A few high clouds will spill
over the ridge...otherwise skies will remain mostly clear.
Surface high pressure will increase over the Great Basin tonight and
some local gusty winds over the western slopes will likely develop.
The ridge will peak over the region on Monday and temperatures
will warm well into the 80s with some of the warmer spots topping
off around 90 degrees. A lighter northerly flow will continue.
Mountains will generally warming into the 60s and 70s.
A through will approach the region on Tuesday and the ridge axis
will be moved to the east over Nevada. Wind flow within the valley
will reverse direction and flow through the delta should become
stronger. Temperatures should start a cooling trend. The trough
will move over the interior on Wednesday but at this time it is
moisture deprived so no showers are expected. We may see some high
clouds Tuesday and Wednesday from this trough. Temperatures look to
stay between 5 and 10 degrees above seasonal normals on Wed.
.Extended Discussion (Thursday through Sunday)
The general consensus in the extended period is for a very weak
upper trough to remain over the region. If this solution pans out,
warm temperatures are likely to continue into next weekend. The
pattern would favor a Delta Breeze to occur, but would likely
bring cooling only to areas immediately adjacent to the Delta. The
upper trough could also bring isolated mountain showers, but not
enough confidence in timing and location to include them in the
forecast just yet.
VFR SKC or FEW-SCT250 conditions expected over interior NorCal
through Mon. Northerly winds 5-15 kts overnite except over the
mountains...with local-isolated NE wind gusts up to 35 kt possible.