Taney County MO. – Normally I
leave the guess work as to the weather forecast for the
professionals. However, the setup for Friday, December the 23rd
has gotten my interest.
The setup for problems will begin on
Friday, in the predawn hours, as what is known as isentropic
upglide develops due to a warm front moving towards us. For those who are
not familiar with the term, it refers to the fact that warm
air resists undercutting the cold air that will be in place. The
warm, less dense air rises gradually in vertically as it overrides
the sloping cold dense air (less potential temperature air). It must
do this to stay at the same potential temperature (same relative
density). This is why warm fronts tend to bring widespread light to moderate precipitation. Please see the diagram below:
So,
warm and moist air aloft with colder air at around 30 degree near the
surface. Any moisture that falls through such a zone will sometimes
turn into snow, sleet or freezing rain depending on just how deep the
cold layer is at any given location. Note that this will be more of a probability in higher locations and areas to the east of Hwy 65! Whatever happens, this should be
a rather short-lived deal as it should warm up above freezing shortly after
sunrise. What area motorists will want to track, however, is the
possibility of a few sloping roads and some bridges getting a thin glaze of
ice – possibly just enough to pose a hazard to a few early commuters! www.taneyservices.com
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