Scientific Forecaster Discussion
fxus66 khnx 111124
Area forecast discussion
National Weather Service Hanford California
324 am PST Wed Dec 11 2019
Synopsis...a trough moving through the area may bring some light
showers to the Sierra this morning. High pressure will build back
over the area tonight through Thursday with dense fog possible
across the San Joaquin Valley overnight. Another Pacific storm
system is expected to bring more wet weather Friday night through
the weekend, mainly over the mountains.
areas of dense fog continue across portions of the San Joaquin
Valley, mainly south of Madera due to a weak disturbance moving
through. A dense fog advisory for these areas has been extended
until 10 am this morning. The weak S/WV trough has produced some
scattered showers but precipitation amounts have been very light
with just a few hundredths of an inch at most, mainly over the
Sierra. Regional radar imagery shows just a few showers continue
across the San Joaquin Valley and over the Sierra Nevada. Do not
expect much if anything more from these as high-res models show
them diminishing through sunrise.
The trough will shift east today as the northeast quadrant of a
broad high pressure ridge builds over central California. This
will provide US with dry weather this afternoon through Friday
morning. There will likely be more Tule fog across the sj valley
the next couple of nights and additional dense fog advisories
may be needed.
While the storm track will remain over the Pacific northwest and
northern California the next couple of days, it will begin to shift south
on Friday as the upper ridge gives way to an approaching trough
from the north. Precipitation is expected to be focused around
Yosemite Friday night and then spread south down to Kern County
on Saturday afternoon. Lingering upslope showers may continue
into Sunday. Quantitative precipitation forecast is up to a half inch liquid around Yosemite np
tapering to around a quarter inch for Sequoia & Kings Canyon np
and only a few hundredths to a tenth of an inch in Kern County.
Snow levels will begin above 8000 feet in Yosemite np on Friday
night then lower to near 6000 feet Saturday with up to 6 inches
of new snowfall. Little rainfall is expected over the sj valley
with trace amounts to a few hundredths, mainly along the eastern
side of the valley. Dry weather is forecast Sunday night through
Tuesday as upper ridging builds in from the Pacific.
Aviation...in the San Joaquin Valley, areas of IFR/LIFR in fog
and low clouds through 18z Wednesday. In the Sierra Nevada and
adjacent foothills, areas of mountain obscuring IFR in low clouds
thru 18z Wed. Otherwise, VFR conditions expected across the
central California interior for the next 24 hours.
Air quality issues...
on Wednesday December 11 2019...fireplace/wood stove burning
status is: no burning unless registered in Fresno and Kern
counties. Further information is available at valleyair.Org
The level of certainty for days 1 and 2 is medium.
The level of certainty for days 3 through 7 is medium.
Certainty levels include low...medium...and high. Please visit
www.Weather.Gov/hnx/certainty.Html for additional information
an/or to provide feedback.
dense fog advisory until 10 am PST this morning for caz182>188.