Area Forecast Discussion
Issued by NWS Sacramento, CA
FXUS66 KSTO 280834
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
134 AM PDT Tue Apr 28 2015
High pressure will bring mainly dry weather and above normal
temperatures to the area through the week. Isolated thunderstorms
possible near the crest of the Sierra Thursday and Friday south of
Lake Tahoe. Continued warm this weekend with thunderstorms possible
over all the mountains.
.Discussion (Today through Friday)...
A through is approaching the region today and the ridge axis will
move 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 normal`s during this time
Northerly flow starts to develop on Wednesday and will become
breezy by Thursday as surface high pressure builds into the Great
Basin Wednesday night. Easterly winds will increase over the
mountains Wednesday night with the strongest wind gusts around
30 mph. Valley winds look to be in the 15 to 25 mph range on
Thursday. Temperatures will warm into the upper 80s and lower 90s
in the valley for most locations for Thursday and Friday. Isolated
thunderstorms look possible in the Sierra for both of those days.
.Extended Discussion (Saturday through Tuesday)...
Weak disturbances will move through the region Saturday and Sunday
bringing some instability to the mountains. The best chance of
afternoon/evening thunderstorms is over the Sierra from around
Lake Tahoe southward on Saturday with chances also spreading to
the northern and coastal mountains for Sunday.
Weak disturbances on Monday and Tuesday will keep thunderstorm
chances on both days over the mountains. Temperatures will be
well above normal on Saturday but gradually cool each day through
the period to near seasonal normal`s for Monday and Tuesday.
VFR conditions expected across interior NorCal the next 24 hrs.
Delta Breeze will increase on Tue with gusts up to 25 mph.