Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 272140
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
240 PM PDT Mon Apr 27 2015

.Synopsis...
High pressure will bring dry weather and above normal temperatures
to the area through the week.

&&

.Discussion (Today through Thursday)...
As expected with the upper level ridge moving overhead,
temperatures at 2 pm are roughly 6 to 12 deg F above 24 hrs ago.
The northern Sacramento Valley and some of the higher terrain
showing the greatest change, while the northern San Joaquin
Valley shows the smallest change. The pressure gradients from MFR
to RDD and RDD to SAC have really relaxed, resulting in weakened
winds. Winds will remain breezy in some spots within the northern
and western Sacramento Valley this afternoon. Meanwhile the SAC to
RNO gradient across the Sierra has continued and will gradually
weaken overnight.

A weak trough will move over the area late Tuesday and Tuesday
night with a secondary pulse on Wednesday into early Thursday.
Little moisture will be present and any precip should remain
removed to the north, mainly across Washington & Oregon. Tangible
effect of this trough will be a few more clouds and more of an
onshore flow, which should allow for a decent Delta Breeze to
develop. Temperatures may cool a few degrees, but will remain much
above normal for this time of year. However, more noticeable
cooling expected for areas directly impacted by Delta Breeze. The
trough moves east Thursday with a return to high temperatures near
90 in the valley and upper 60s and 70s in the mountains.
JClapp/CEO

.Extended Discussion (Friday through Monday)
Weak trough over the area Friday into early next week will bring
some instability over the mountains as disturbances move through
Northern California. The best chance of afternoon/evening
thunderstorms on Friday is over the Sierra and around Lassen Park
Area and over the Sierra on Saturday. There is a slight chance of
thunderstorms over all the mountains of interior Northern
California on Sunday and Monday.

Temperatures will be warm (about 10 to 20 degrees above normal)
on Friday with north to northeast winds in the morning. The Delta
Breeze along with a cooler airmass will bring cooler temperatures
over the weekend into Monday, especially around the Delta and
adjacent Valley areas. Temperatures over the weekend and Monday
will be near normal to several degrees above normal for this time
of year.

&&

.Aviation...
VFR conditions expected across interior NorCal the next 24 hrs.
Northerly gusts are rapidly weakening this afternoon in the
valley. Delta Breeze will begin this evening and increase into
Tue. Over the northern Sierra, local NE wind gusts 15-25 kts to
continue tonight. JClapp

&&

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

$$






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