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AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
919 AM PDT Wed Apr 1 2015

.Synopsis...
An upper trough will bring a slight chance of showers to the
northern mountains this afternoon, then breezy north winds tonight
into Thursday. A stronger trough will bring better chances of rain
and snow Saturday night into early next week.

&&

.Discussion...
Mostly clear skies are prevalent this morning as a weak upper
trough approaches Northern California. This upper trough has
already brought a considerable amount of synoptic cooling, as
temperatures at this hour are running 3 to 9 degrees cooler than
24 hours ago. This system doesnt have much moisture associated
with it, but there may be just enough instability to bring a few
showers to the Shasta-Trinity mountains along with Southern
Cascades this afternoon. 

Behind this system, pressure gradients will rapidly tighten and
result in breezy north winds across much of the forecast area. It
currently looks like pressure gradients will be tightest tonight,
then rapidly weaken during the day on Thursday. As such, while we
may see some 15-20 mph winds with gusts to 35 mph in the
Sacramento Valley, they will likely be short-lived and locally
confined.

A modest warmup is expected Thursday and Friday as high pressure
builds across California. This will be short-lived however, as a
2nd stronger trough approaches the West Coast Saturday.

&&

Dang


.Extended Discussion (Sunday through Wednesday)

A parent Gulf of Alaskan low pressure system will drop southeast
into the Pac NW this weekend into early next week with several
associated troughs progressing into NorCal. Regardless of precip
chances and areal coverage, the pattern will bring cooler
temperatures (closer to normal) and increased cloud cover. The
cooler nature of the system would likely bring the potential for
snow below pass levels. Ridging builds back in over the region by
Wednesday with northerly winds are more sunshine.      JClapp

&&

.Aviation...

VFR conditions thru the forecast period. Skies will generally
remain mostly clear. Breezy N to NE ridge winds with gusts to
around 25 kts this morning and SFC-030 AGL winds becoming more
widespread later today.      JClapp


&&

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

$$





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