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March 11th-13th Winter Weather Event. Winter's last gasp?


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DISCUSSION...KNQA radar imagery has shown a band of 30-35 dBZ
precipitation develop and move through western Tennessee. Higher
values of KDP aloft suggest heavier snowfall rates are possible
which has been corroborated by recent surface reports within the
region. This band is expected to continue to the north and east this
evening into the overnight. Downstream of this band, temperatures in
Middle/eastern Tennessee and eastern Kentucky are still in the 40s
to low 50s F. As the shortwave continues into the Mid-South, a
deepening surface low development in the central Gulf Coast will
support an increase in cold air advection across these areas. This,
along with cooling within heavier precipitation bands, will support
a relatively quick transition to snow. Frontogenesis at 850-700 mb
and ascent with the shortwave will support 1-2 inch per hour snow
rates. The greatest rates are most likely along the western
foothills/slopes of the Appalachians where upslope flow at low
levels will enhance vertical motion


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