Category: Forecast

September 23, 2019 Summary: A low pressure system is centered just to the east of the southern Sierra Nevada at this hour and is moving rapidly towards the south.  There is a chance of a few showers over the southern Sierra Nevada today, but the only real ramification for the valley floor will be somewhat…

September 22, 2019 Summary: The short term forecast through midweek is just a matter of temperature swings.  Currently, a weak ridge of upper level high pressure is moving through.  It will drive temperatures into the lower 90s at most locations this afternoon.  To our north, a low is moving through the Pacific Northwest and it…

September 21, 2019 Summary: High pressure is finally nosing in from the eastern Pacific.  This will result in a weekend warming trend.  Already this morning, temperatures are running generally 2 to 4 degrees warmer than 24 hours ago.  To our south, there is plenty of action over the equatorial waters of the eastern Pacific.  Hurricane…

September 20, 2019 Summary: Today will be the beginning of a short lived warming trend which will only last through Sunday.  Upper level high pressure is starting to move eastward from the eastern Pacific and into California.  The trough of low pressure that resulted in such pleasant temperatures yesterday has shifted into Idaho and northern…

September 19, 2019 Summary: Low pressure stretches from the Canadian Rockies southward to central California this morning.  Satellite imagery shows cloud cover banking up against the west facing slopes of the Sierra Nevada and the north facing slopes of the Tehachapi Mountains.  Doppler radar is picking up isolated showers over the Sierra Nevada, mainly in…

September 18, 2019 Summary: The latest low pressure system is currently moving through the Pacific Northwest and northern California.  Light showers or sprinkles are occurring as far south as a Bay Area/Chico line and will have very little impact on central California other than to cause temperatures to drop even more on Thursday.  As pressures…

September 17, 2019 Summary: The trough of low pressure which resulted in such a pleasant day yesterday has already raced eastward into Wyoming and Utah.  The freezing level dropped all the way down to 9,400 feet over Oakland, indicating the air aloft is still quite mild.   Storm number 2 is located near Vancouver Island…

September 16, 2019 Summary: A cold front extends from the northern Sierra Nevada southwestward to the Bay Area then southwestward out to sea.  A narrow band of light rain extends along the front.  However, Doppler radar and satellite imagery show a distinct weakening of the front as it moves steadily east/southeast.  I feel safe now…

September 15, 2019 The precursors of a major weather change are already under way.  Mid and high level clouds are being drawn up from the southwest, resulting in what will be a partly cloudy Sunday.  A strong low is now centered near Vancouver Island and will drive into the Pacific Northwest later this afternoon and…

September 14, 2019 Summary: Today will be the last of the triple digits for a while.  Most locations this afternoon will top out in the 99 to 102 degree range as upper level high pressure is almost directly above central California.  The marine layer remains very shallow with the latest sounding at the naval installation…