Category: Forecast

August 27, 2018 Summary:  Temperatures Sunday afternoon rose into the upper 90s at several locations, but no location reached the 100 degree mark.  a reversal will occur again beginning today as a weak trough of low pressure starts to stretch from western Canada down into the northern Great Basin.  Once again, the on shore flow…

August 25, 2018 Summary:  Expect temperatures to be marginally warmer through Monday as upper level high pressure has slightly increased over the past 24  hours.  The marine layer has responded to this change and has fallen back to 1,800 feet.  At last report, winds at Travis Air Force Base in the Delta were southwesterly at…

August 24, 2018 Summary:  We should enjoy moderate temperatures, at least by the standards of late summer, through the end of the month.  Models continue to show upper level high pressure being suppressed into upper Baja.  In the meantime, a low center has moved from the Pacific Northwest into the northern Rockies, creating a zonal…

August 23, 2018 Summary:  The marine layer remains at around 2,900 feet deep this morning and continues to allow breezes to move through the Delta and other gaps and passes along the Coast Range.  Currently, the flow is fairly weak with winds at Travis Air Force Base being out of the southwest at 15 and…

August 22, 2018 Summary:  A strong surge of modified marine air moved down the valley yesterday.  All locations, for a change, were below the century mark even as far south as Kern County.  Up at Merced, closer to the marine source, the afternoon high yesterday was only 88.  The marine layer this morning is 2,900…

August 21, 2018 Summary:  Finally, the break we have been looking for began last night after another hot day yesterday.  Yesterday at this time, the marine layer stood at nearly 1, 800 feet.  This morning, it’s jumped up all the way to 3,200 feet and is surging through the Delta and other gaps and passes…

August 20, 2018 Summary:  Triple digit heat was again commonplace throughout the valley Sunday afternoon with hottest locations coming in at about 105.  Upper level high pressure is centered over southern California this morning, but is showing signs of weakening and moving to the east.  The marine layer along the coast is not sufficiently deep…

August 18, 2018 Summary:  Temperatures yesterday afternoon jumped right back into triple digits, ranging from about 101 to about 105.  Similar conditions will prevail through Monday as upper level high pressure builds over central and southern California.  In fact, the center of circulation of this high will park right over southern California this afternoon through…

August 16, 2018 Summary:  We’ve had a minor break from the heat courtesy of a shallow burst of marine air which managed to penetrate the valley.  Just about all locations were at least slightly below the century mark, so the question for today is whether the marine air will mix out before temperatures begin to…

August 15, 2018 Summary:  Temperatures overall this morning are about 2 degrees cooler than 24 hours ago.  The marine layer’s depth at Monterey is  now  up to 2,000 feet.  This is allowing a weak flow of marine air through the Delta and even a minimal amount of sea breeze is moving through Pacheco Pass.  It’s…