FXUS66 KHNX 202218
Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
318 PM PDT Thu Jul 20 2017
Temperatures near normal through Friday then will begin to warm
up again this weekend. Dry conditions except for the possibility
of an isolated thunderstorms over the Sierra Nevada Sunday through
Some high level clouds moving North over Kern and Tulare counties.
Otherwise warm and dry conditions continue across the central CA
interior. Smoke along the foothills and east side of the valley
moving towards the Sierra Nevada as upslope winds ramp up.
A southwest flow aloft continues across North and Central CA.
This onshore flow will result in near persistent weather
conditions through Friday.
The SW flow aloft weakens Friday as an upper trough moves east
away from the PacNW. This will allow for the upper ridge in the
Central U.S to begin shifting Westward towards the four corners
region. The ridge will extend into Scal and usher a warming trend
with temperatures expected to quickly increase back into the
triple digits on Saturday, with the hottest day on Sunday.
Monsoon moisture is forecast to return to the Sierra late Sunday.
Lower level may remain dry increasing the potential for dry
lightning over the sierra high country. The threat of thunderstorm
activity may continue through mid week in the mountains and
desert areas as models prog deeper moisture in the area from
Monday through Wednesday.
Operational models GFS and Canadian develop a trough in the
Pacific NW towards the end of the week. This may provide a SW flow
aloft taking the monsoon moisture east of the sierra. However EC
model progs the ridge and moisture remaining across the district
through the end of next week. Thus forecast confidence is not high
towards the end of next week.
Areas of MVFR and local IFR visibilities in smoke from area
wildfires. Otherwise, VFR conditions will prevail across the
central CA interior during the next 24 hours.
.AIR QUALITY ISSUES...
please see SFOAQAHNX
The level of certainty for days 1 and 2 is high.
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.php for additional information
an/or to provide feedback.
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