MD 1648 CONCERNING WINTER MIXED PRECIPITATION FOR CENTRAL APPALACHIANS…MID ATLANTIC
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 occur. 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 www.spc.noaa.gov for graphic product... ATTN...WFO...OKX...ALY...PHI...BGM...BUF...CTP...LWX...PBZ... RLX... LAT...LON 38327873 38517974 39167986 40567961 41717904 42067799 41907558 41547397 40537401 39307622 38597785 38327873
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