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Area forecast discussion
National weather service san joaquin valley - hanford ca
930 am pst tue jan 17 2012
.Synopsis...
Much colder temperatures will continue today and wednesday as a
Cold and dry airmass remains in place. A wet pattern is setting up
For later in the week as a series of low pressure systems are
Expected to move over the region.
&&
.Discussion...
Satellite loops show mainly clear skies across the central
California interior this morning...With only a few upslope clouds
Over the lower kern river canyon. The clear skies...Low dewpoints
And light winds resulted in strong radiational cooling overnight. As
Of 17z /0900 pst/ this morning...Lows in the central and southern
San joaquin valley ranged rom 18 /at an automated station near
Gustine/ to 33 at the cimis station near kettleman.
The models forecast weak ridging to move into california over the
Next 36-48 hours. With a stable airmass over the region...Lows
Wednesday morning should be similar to this morning. With keep the
Freeze warning in place for the central and southern san joaquin
Valley through 17z /0900 pst/ wednesday.
An upper-level trough is forecast to reach the pacific coast by 00z
Friday /1600 pst thursday/. This will bring a slight chance of
Precipitation to the northern fringes of the hanford
Warning/forecast area. The 16z rfc qpf guidance calls for 0.15 inch
At yosemite valley between 18z thursday and 00z friday /1000-1600
Pst thursday/...And 0.02 inch at huntington lake. Precipitation
Spreads south thursday night to near fresno...With only slight
Chance pops for the southern san joaquin valley and the kern/tulare
County mountains.
The second storm is forecast to arrive friday afternoon/evening and
Model qpf is considerably higher. If this trend continues...Winter
Weather headlines may be needed with this storm.
&&
.Prev discussion... /issued 534 am pst tue jan 17 2012/
Most valley temperatures this morning have dipped to 28 degrees
Or lower. Most meso-west obs range from 21 to 28 degrees most
Locales. Temperatures today will struggle into the lower 50s
Before another cold night tonight. Similar temps can be expected
By wed morning. However...As a low pressure area nears the west
Coast later today...Central ca may see increasing clouds during
The overnight. This could help keep temps up a few degs...Or at
Least lessen the sub-freezing durations.
Otherwise skies are clear across the region...Except for a couple
Of patches of residual low clouds in the foothills of tulare and
Kern counties.
The shift into a more unsettled weather patter will begin wed as a
Series of upper level shortwave push moisture onshore. This first
Of the series could push some sct light precip as far south as
Fresno thurs or thurs eve. A stronger shortwave will arrive fri
With rain chances spreading south into kern county...Probably
Later in the day or evening hours. This sys will move out quickly
In the fast quasi-zonal flow off the pacific. There will be a
Short break in the precip sometime sat or sat nite...Before
Another wet sys arrives sun. This shortwave looks like it will be
The strongest of the series with a good wetting rain in the valley
And foothills...Maybe even the high desert. Heavy mountain snow is
Possible abv 6k feet in the sierra.
The 00z euro and 06z gfs indicate the upper jet will begin lifting
Back to the north early in the week...But central ca will still be
Susceptible to some sct light showers into mon.
&&
.Aviation...
Vfr conditions can be expected across the central california
Interior through 18z wednesday.
&&
.Air quality issues...
None.
&&
.Hnx watches/warnings/advisories...
Freeze warning until 9 am pst wednesday for the central and
Southern san joaquin valley /caz089>092/.
&&
$$
Public...Sanger
Avn/fw...Bean
Synopsis...Bso