Area Forecast Discussion
Issued by NWS Sacramento, CA

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FXUS66 KSTO 281729
AFDSTO

Area Forecast Discussion
National Weather Service Sacramento CA
1029 AM PDT THU APR 28 2016

.Synopsis...
Breezy north winds today then again over the weekend. Isolated
showers possible over the northern Sierra today and through the
weekend with a slight chance of thunderstorms there. Otherwise dry
with above normal temperatures through Sunday.

&&

.Discussion...
Mainly dry weather expected today as the upper low which brought
thunderstorms yesterday and some mountain snow overnight. Showers
wrapping around the back of the low possible through today over
the Sierra. A few isolated thunderstorms may develop over the
Motherlode this afternoon. Several meso models are showing these
centered over Caleveras and Tuolumne counties around noon to 3 pm.
Temperatures today will be much warmer this afternoon, reaching
around 80 in the Valley. Breezy north winds expected throughthe
day, gusting up to 30-35 mph. Current forecast is on track, no
update needed.

Considerable photographic, video, and eye witness evidence from
law enforcement and the public have lead us to confirm an EF0
tornado touched down in the Waterford/Hickman area yesterday
around 3:45 pm. This was a brief touch down, with relatively minor
damage.

In addition to the tornado, there were numerous funnel clouds
reported. There is no evidence that any of this touched down.
Large amounts of small hail were reported in several locations,
notably just north of Oakdale, causing damage to mobile home
carports and covering roads.

Snow fell over Sierra passes yesterday afternoon and overnight.
About an inch fell at Donner Pass Wednesday afternoon, with
another inch overnight. This caused some travel difficulties. EK

&&

.EXTENDED DISCUSSION (Monday THROUGH Thursday)

Models showing upper ridging over NorCal Monday which shifts east into
the Great Basin Tuesday as offshore upper low approaches. Upper
low progged inside of 130 W Wednesday with potential for showers
mainly over the mountains. Models differ with track of low
Thursday but overall pattern suggests deformation zone sets up
over Interior NorCal with potential for more widespread showers
and possibly isolated thunderstorms. High temperatures in the
Central Valley cool from the low to mid 80s Monday to 70s
Thursday.
&&

.AVIATION...

VFR conditions over Norcal TAF sites thru Fri. Possible MVFR/IFR
conditions over hyr elevations of the Sierra and Motherlode as
NEly (backwash) flow spreads low clouds and possible showers from
Wrn NV over the Sierra Crest til 03z Fri. Nly sfc wind gusts up to 25
kts in the Central Valley til 03z Fri.
&&

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

$$


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