Category: Forecast

September 13, 2019 Summary: Upper level high pressure stretches from one center over the eastern Pacific all the way eastward to another high over the southeastern U.S.  The high has crushed the marine layer, which is down to just 300 feet at Monterey.  The freezing level remains at about 16,000 feet, according to the latest…

September 12, 2019 Summary: It will be noticeably warmer today as the autumn like trough of low pressure has moved, stretching from eastern Montana southward into Colorado.  Pressures are increasing from off shore as a zone of upper level high pressure will stretch from the waters off the California coast all the way eastward into…

September 11, 2019 Summary: The flow of marine air into the San Joaquin Valley has ceased.  Winds at Traverse Air Force Base in the Delta were dead calm as of 6:30am.  The trough of low pressure responsible for the refreshing break in the heat now stretches from Idaho southward into southern Nevada.  Upper level high…

September 10, 2019 Summary: Today will be the coolest we have experienced since late May.  A deep trough of low pressure is centered over Washington state this morning with a trough extending into northern and central California.  The freezing level has dropped from 14,500 feet down to 12,000 feet over Oakland and near the Oregon…

September 9, 2019 Summary: currently, there is an 8 millibar difference in pressure between San Francisco and Las Vegas.  In other words, barometers are lower over the interior and this tugs the marine layer inland.  The flow aloft has become westerly behind a weak low center which moved northeastward from off the northern California coast…

September 7, 2019 Summary: We are now in the beginning stages of what will be a major cooling trend.  Upper level high pressure has now migrated further east, allowing a weak low off the northern California coast to move northeastward into Oregon.  This is setting the instrumentation in proper order for noticeably cooler weather this…

We will be out of the office Friday, September 6.  We’ll return Saturday, September 7.  If you have any questions or concerns, please email or call using the above information.    Thank you, John and Trudy   September 5, 2019 Summary: The latest batch of monsoonal moisture will be moving through today through the evening…

September 4, 2019 Summary: High pressure at the mid and upper levels of the atmosphere stretches from Oklahoma westward to southern California.  The winds aloft remain out of the south along the western edge of the high.  This will continue to pump monsoonal moisture into southern California and up the Sierra Nevada for more afternoon…

September 3, 2019 Summary: Upper level high pressure remains in a stationary position over the Four Corners region of the Desert Southwest.  The winds at the mid and upper levels of the atmosphere over southern California are out of the southeast while the winds over northern California are out of the southwest.  Monsoonal moisture continues…

August 31, 2019 Summary: Strong upper level high pressure continues to be centered over southern California and Arizona this morning.  The freezing level has again risen to 16,600 feet over Vandenberg this morning.  The flow of marine air into the valley, which has maintained double digit temps the past couple of days has ended.  Winds…