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Mesoscale Discussion 1648
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   Mesoscale Discussion 1648
   NWS Storm Prediction Center Norman OK
   0856 AM CST Thu Nov 15 2018

   Areas affected...Central Appalachians...Mid Atlantic

   Concerning...Winter mixed precipitation 

   Valid 151456Z - 152100Z

   SUMMARY...Areas of heavy snow are likely to develop in the higher
   elevations of the central Appalachian Mountains this morning. By
   afternoon, a mixture of snow and sleet are likely in the lower
   elevations from northern Virginia into northern New Jersey. This
   corridor may changeover to freezing rain or rain this afternoon.

   DISCUSSION...The latest water vapor imagery shows an upper-level low
   in the mid Mississippi Valley with southwest mid-level flow over
   much of the eastern Seaboard. At the surface, a large area of high
   pressure is in place across the Northeast. Surface temperatures are
   below freezing in most of the central Appalachians with dewpoints
   mostly in the teens. As a large area of precipitation moves across
   the central Appalachians this morning, the temperature profile will
   support the development of snow.  Areas of heavy snow will be
   possible especially in the higher elevations of the central
   Appalachian Mountains where 1 inch per hour snowfall rates may

   Surface temperatures from northern Virginia northeastward to
   northern Maryland are currently just below freezing. At this time,
   light snow is being reported along this corridor. This snow will
   likely develop northeastward into southeast Pennsylvania and
   northern New Jersey late this morning. As warm advection continues
   over the top of the cold airmass late this morning into early
   afternoon, a changeover to sleet, freezing rain and rain will be
   possible from northern Virginia to northern New Jersey.

   ..Broyles/Hart.. 11/15/2018

   ...Please see for graphic product...


   LAT...LON   38327873 38517974 39167986 40567961 41717904 42067799
               41907558 41547397 40537401 39307622 38597785 38327873 

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