Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 170547
AFDSTO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
947 PM PST Tue Dec 16 2014

.Synopsis...
The next weather system is moving through tonight and Wednesday.
Another round of valley rain and mountain snow is expected. Brief
drying on Thursday, then another weather system is forecast to
return showers on Friday.

&&

.Discussion...
Rain moving through the area and into the east part of the valley.
Had produced some nice heavy rain and flooded a few streets as it
went through the region...especially in south sac area where CHP
has reported a number of partially flooded streets. A number of
lightning reports as well some cloud to ground but I think more
were cloud to cloud as they past through. Sac Exec reported .81
inches of rain in one hour.

Snowfall will be picking up a little in the next couple of hours.
Models indicate the intensity of precipitation weakening as it
moves higher up the slopes so totals overnight might not be that
impressive along the crest.

On Wednesday showers will linger over the region before anther
weak wave move into the region Wednesday evening. The last deep
wave for the area will move through on Friday followed by a
building ridge of high pressure for the weekend. Only the far
north may get some precipitation over the weekend with most of
California drying out.


.Extended Discussion (Saturday through Tuesday)

Medium range models similar in transitioning to a drier weather
pattern over the weekend into early next week. Lingering shower
threat will continue into Saturday, mainly in the mountains.
Models strengthen upper high in EPAC with associated upper ridging
building over Interior NorCal. Some light overrunning WAA precip
continues to be depicted over the Shasta mountains Sunday, otherwise
dry weather with the main weather concern being impact of valley
fog nights and mornings. Heights continue to increase Monday into
Tuesday with warming AMS. Above normal temperatures expected in
areas not affected by fog with 50s to lower 60s for the Central
Valley and mainly 40s to 50s for the mountains and foothills.

&&

.Aviation...

Dtrtg conds this eve as Pac fntl sys movs inld. Wdsprd MVFR with
areas IFR and Lcl LIFR ovngt into Wed mrng with impvg conds by Wed
aftn. Sn lvls in Shasta mtns arnd 035 ft AMSL and arnd 045 ft AMSL
nr I-80/HWY 50. SWly flow alf tngt vrg to NWLy aft 08z. Lcl SEly
sfc wnd gsts to 25 kts in Cntrl Vly this eve.

&&

.STO Watches/Warnings/Advisories...
winter weather advisory until noon pst wednesday above 4000 feet
in the west slope northern sierra nevada...western plumas
county/lassen park.

&&

$$







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