Scientific Forecaster Discussion
fxus66 khnx 252232
Area forecast discussion
National Weather Service Hanford California
332 PM PDT sun Aug 25 2019
Update...updated air quality issues section.
ridge of high pressure remains over central California today,
meaning another day of above normal heat. This warming trend will
continue early this week, with Tuesday being the hottest day of
the week. Modest cooling trend starting Wednesday due to an upper
level trough weakening the ridge over California. Additionally,
there is a slight chance of afternoon convection over the Sierra
Nevada Tuesday and Wednesday afternoon.
with the northern stream remaining fairly active across the
northern Continental U.S.. here in our neck of the Woods we are quite the
opposite. Ridging has continued to build into the region and
temperatures are gradually rising in response along with clear to
mostly clear conditions. This warming will continue through at
least Tuesday when we expect the peak to the warming to take
place. The remains of the tropical system Ivo will bring a
weakness along the western periphery of the ridging as it moves
northward and is pushed inland over northern California. This
weakness will allow temperatures to synoptically cool and even
bring in some high clouds that will also help to keep temperatures
lower for mid to later part of the week. A few showers and even a
thunderstorm or two will be possible over the highest parts of the
Sierra as the tropical remnants get pushed inland late Tuesday
afternoon and into Wednesday afternoon. High pressure then
reasserts its dominance back into the region into the weekend once
again slightly warming temperatures back up.
Looking further into the future, there are the makings of a more
blocky pattern across the western third of the Continental U.S.. this could
considerably slow things down in the atmosphere and push the
timing further back on guidance. That also could keep high
pressure over the region a bit longer and keep things warm around
here well into next week. However, a fairly strong trough progged
to move into the Pacific northwest could break things up. So a
little bit of uncertainty in longer term.
Aviation...VFR conditions can be expected over the central
California interior during the next 24 hours.
Air quality issues...
on Monday August 26 2019... unhealthy for sensitive groups in
Fresno... Kern and Tulare counties and Sequoia National Park and
Forest. Further information is available at valleyair.Org
The level of certainty for days 1 and 2 is high.
The level of certainty for days 3 through 7 is high to medium.
Certainty levels include low...medium...and high. Please visit
www.Weather.Gov/hnx/certainty.Html for additional information
an/or to provide feedback.