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Cliff Mass
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Super Convergence Zone Dumps Heavy Rain
One of the most striking peculiarities of western Washington weather is the Puget Sound convergence zone  (PSCZ), which can produce a heavy band of precipitation across northern Puget Sound and into the Cascades. The PSCZ  results when low-level winds on th...
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REX Will Dominate Northwest Weather This Week
During the past two weeks, the Northwest has enjoyed absolutely normal weather.   Typical temperatures (see plot below, purple and cyan are normal highs and lows) and nearly normal precipitation (see cumulative precipitation for the same period).  Normal ha...
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Time to Drop the Saffir-Simpson Hurricane Scale
One of the most familiar aspects of hurricane season is the constant talk about the strength of developing storms using the Saffir-Simpson scale, which ranges from Category 1 (a marginal hurricane) to Category 5 (a powerful monster). Today's Saffir-Simpson ...
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Why is autumn air so wonderful?
I can't tell you how many people have commented to me the last few days about the wonderful quality of the air they are breathing.   Some are almost exultant, describing their pleasure in inhaling air that is brisk, clean, and cool---just perfect.    It is ...
Why is autumn air so wonderful?
Why is autumn air so wonderful?
cliffmass.blogspot.com
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Catastrophic Overuse
Is it possible that the media is tending to excessively use the terms  catastrophe and catastrophic in described major weather events such as Hurricane Florence? For example, watching my colleagues at the Weather Channel, the adjective catastrophic was used...
Catastrophic Overuse
Catastrophic Overuse
cliffmass.blogspot.com
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Hurricane Florence: Stunningly Good Track Forecasts, Problems with Intensity
Hurricane Florence is has recently made landfall near Wilmington, North Carolina as a category one storm with sustained winds of approximately 85 mph (see latest radar image below).  It is now weakening rapidly. Very few locations over land have experienced...
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Changes in Uncertainty for Hurricane Florence: Are We Communicating this Well Enough?
Hurricane Florence has been a study in contrasts.   For the last several days its track has been one of the most predictable on record.  Most major models have been spot on, the various ensembles have been tightly clustered, and the uncertainty in the forec...
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Battle of the Models: The Old Versus the New U.S. Global Weather Forecasting Model
Early next year, the U.S. will move to new global model.   The new model (FV-3) was developed at the NOAA Geophysical Fluid Dynamical Lab (GFDL) in Princeton and will replace the old Global Forecast System (GFS) model that has been around forever. The new m...
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The Fall Transition
Summer is over west of the Cascade crest.   Heat waves are done.  Dense smoke in western Washington is finished.  Take out your sweaters and rain gear.   You will need them.   A reason to be thankful we are living in the Northwest rather than central and so...
The Fall Transition
The Fall Transition
cliffmass.blogspot.com
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Light Smoke Reaches Western Washington But Won't Last
The sunset this morning had a reddish twinge to it and the Seattle Space Needle cam clearly showed a haze layer on the eastern horizon (see below) A thin veil of smoke has extended over western Washington, with far higher values east of the Cascade crest.  ...
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