Category: Forecast

September 29, 2018 Summary:  The marine layer along the coast is now 4,000 feet deep and has completely pooled the San Joaquin Valley with modified marine air.  This will lead to a much cooler day.  In fact, readings in  most areas will probably struggle into the low 80s today and Sunday.   The culprit is…

September 28, 2018 Summary:  The major change in our pattern we’ve been discussing recently is well underway.  The first precursors of a major cooling trend are in the form of a marine layer that continues to rise, standing at 2,500 feet at Monterey, and a sea breeze gushing through the Delta.  Winds at Travis Air…

September 28, 2018 Summary:  It’s time to take the threat of precipitation beginning Monday night more seriously.  Models this morning show the  high which has resulted in hot September weather the past few days beginning to break down as the first of two low pressure systems bears down on California.  The first will move inland…

September 27, 2018 Summary:  Temperatures this afternoon on the valley floor have generally warmed into the mid to, in some cases, upper 90s.  Tomorrow will again be hot by the standards of late September, but expect at least a few degrees of cooling as that sharp ridge of upper level high pressure begins to shift…

September 27, 2018 Summary:  After having it exceedingly easy in this chair for months, I now have a complex mess on my hands.  One source of problems is from the  northwest.  The other is from the south and southeast.  Short term, strong upper level high pressure right along the Pacific coast will result in hot…

September 26, 2018 Summary:  Strong high pressure at the mid and upper levels of the atmosphere continues to cover the eastern Pacific with the main center off the coast of the Pacific Northwest, extending northward into the Gulf of Alaska.  The high will continue to build over California during the next 48 hours, driving temperatures…

September 25, 2018 Summary:  A sharp high at the upper levels of the atmosphere extends from the Pacific coast northward into the Gulf of Alaska while a developing low is roughly a thousand miles off the central coast.  The high will begin to slowly shift inland through Thursday for yet another warming trend.  The marine…

September 24, 2018 Summary:  A trough of low pressure is currently moving eastward to the northern Rockies and is extending southward into northern Nevada and Utah.  This system did very little to lower temperatures as even the marine layer only deepened to around 1,500 feet overnight.  Still, pressures are slightly lower aloft which should allow…

Summary:  Upper level high pressure extends from the eastern Pacific eastward over California and into the Desert Southwest.  A low center is developing near Vancouver Island which will eventually extend a very weak trough down into northern California.  The marine layer has deepened a little over the past 24 hours and is now at 1,200…

September 21, 2018 Summary:  Temperatures yesterday afternoon hit the 90 degree mark at several locations.  They will warm into the mid 90s this afternoon.  Upper level high pressure continues to build into California and has crushed the marine layer which now stands at only 500 feet at Monterey.  Travis Air Force Base in the Delta…