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wdrag

OBS only thread winter storm Jan 19-20, 2019

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Would like to keep this an observations only thread of what will be an interesting 18 hour winter storm 5P today-2P Sunday, with potentially high impact (damaging power outage) glaze from somewhere near or just n of I-80 in nw NJ/ne PA northward to I-84, after a front end snow/sleet combo prior to midnight.

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A surface low with pressure near 1000 mb is currently located near Memphis. Noted by the arrow on the COD pressure fall analysis below is the area of strongest 850mb warm-air advection (see SPC analysis page).  It's no coincidence max pressure falls are occurring in the same area over eastern KY. There is also a secondary max associated with latent heat release in western AL, just north of numerous strong to severe thunderstorms.  

413560833_sfclow.png.4648d662530aada0e310f37112a9e2ff.png

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18 minutes ago, weathermedic said:

Flash flood watches just posted for much of the area

Yep, same here as well.

Temp has been holding steady for the past few hours or so.

Current temp 36/DP 28/RH 65%

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NWS backs off more, as warnings were converted to advisories for Morris, Warren, Lehigh, Northampton, and Berks in the Philly CWA and for Essex and eastern Passaic in the NYC CWA.  In addition, WWA's were dropped for Middlesex and Western Chester, as snowfall amounts were cut again, as per the map.  

PHI_Snow.png

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