Category: Forecast

September 20, 2018 Summary:  Upper level high pressure is expanding eastward and northward.  This puts us under a dry, northwest flow aloft.  As evidence of building high pressure aloft, the freezing level has moved up to 14,200 feet and satellite imagery indicates there are no clouds or low fog along the northern and central California…

September 19, 2018 Summary:  Upper level high pressure continues to cover the Desert Southwest into Texas while a trough of low pressure is moving through northern and central California today.  It will slide into the Great Basin by this evening.  Already this morning there are subtle hints that a warming trend is at hand.  The…

­­­­­John Hibler Weather Forecasting www.johnhibler.com­­ johnhibler@johnhibler.com 573-776-3920                                   September 18, 2018 Summary:  A high center over Texas covers the southern plains and the Desert Southwest.  A massive low covers the Gulf of Alaska, much of western Canada, with a trough extending southward into northern and central California.  Embedded within this trough is a secondary…

September 17, 2018 Summary:  The overall pattern has not changed much.  A broad trough of low pressure stretches along the Pacific coast southward to central California with a southwest flow aloft.  At the surface, the flow remains onshore, allowing marine air to move down the valley from time to time.  This mild air mass has…

September 15, 2018 Summary:  A broad trough of low pressure extends from northern Canada southwestward to off the central California coast.  There are weak waves of low pressure moving through the trough, one of which is  moving through central California at this hour.  There’s no active weather associated with this system, but it is being…

September 14, 2018 Summary:  It is another cool morning throughout the valley as overnight lows are bottoming out anywhere from the mid 40s to the lower 50s with mid to upper 50s in the urban areas.  We now have a massive trough of low pressure extending from northern Canada southwestward to off the northern and…

September 13, 2018 Summary:  There is definitely a touch of fall in the air this morning.  Most locations are from 4 to 8 degrees cooler than yesterday morning at this time.  A few locations dipped into the mid to upper 40s as of 6:00am.  Lindcove reported 47 and Ivanhoe 48.  Most other locations were in…

September 12, 2018 Summary:  A major pattern change is underway.  Satellite imagery clearly depicts a large area of low pressure extending from the eastern Pacific off the coast of the Pacific Northwest down into northern California.  Already this morning, the freezing level has dropped to 12,900 feet over Oakland and the marine layer, which was…

September 11, 2018 Summary:  today will be the last summer type day we will see for the next five to seven days.  Upper level high pressure which has been hovering off the southern central California coast over the past several days is slowly being suppressed southward by a developing low over the Pacific Northwest.  The…

September 10, 2018 Summary:  Relatively strong high pressure at the upper levels of the atmosphere is centered just to the southwest of Santa Maria this morning.  This is helping to maintain a shallow marine layer which, as of last report, stood at just 1,500 feet.  The air aloft is plenty warm with the latest sounding…