Round Two On The Way

Water vapor satellite from 7:45 a.m...click for larger image

Upper level low crossing the bay at 7pm...click for larger image

Water vapor satellite imagery and radar data show the morning round of rain and snow tracking northeast with the precipitation expected to taper to light rain or drizzle mixed with some sleet or a few flurries through midday.  However, the same satellite imagery is showing what the computer models have been forecasting; part 2 of this storm to our southwest is ready to move toward the mid Atlantic and should arrive during the evening rush hour.  This second part of the storm is the low pressure system tracking through the atmosphere up around 18,000 feet.  It is expected to move across the lower Chesapeake Bay this evening , possibly producing a period of heavy snow between 4pm and midnight, perhaps even kicking up some isolated thundersnow.  The approaching upper level low will help the surface low (still rather disorganized over Georgia and South Carolina) to rapidly intensify, and both systems will head northeast to a position well east of Cape Cod by dawn on Thursday.

RPM total snow forecast by early Thursday a.m...click for larger image

If this forecast scenario holds, snowfall totals (from both parts of the storm) will reach 6-10″ in the colder northern and western suburbs, and 2-6″ east of I-95 by the time the snow winds between midnight and 2:00 a.m.  A fascinating and complicated storm which may still require forecast updates…stay tuned!

Tom Tasselmyer

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One Response

  1. Did I miss something here? I live in Colora md and it has not stopped snowing since this am. There has been no rain or freezing rain here. It’s all snow about 6 inches so far and it’s 11:03! I am sure you will get some surprising photos. Round two no thank you!
    Have a good day kim

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