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Mike Powell | All | HVYSNOW: Probabilistic He |
October 14, 2024 8:37 AM * |
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FOUS11 KWBC 140709 QPFHSD Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 309 AM EDT Mon Oct 14 2024 Valid 12Z Mon Oct 14 2024 - 12Z Thu Oct 17 2024 ...Northeast... Days 1-2... An anomalous upper level trough over the Northeast will lead to a strengthening cyclone over northern New England this morning. The 850mb low positioned over Upstate New York will track north and east through the Green and White mountains by this afternoon. To the north and west of the 850mb low, a surge in both moisture and NW winds will result in a stronger upslope component into the Adirondacks, Green, and White mountains throughout the day. In addition to the sufficient upper level ascent, an ari-mass that is quite cold by mid-October's climatology will support sub- freezing boundary layer temps for in the northern Appalachians. Locally heavy snowfall rates are expected with 0.5-1"/hr rates possible in the tallest peaks of the Adirondacks this morning and afternoon according to the 00Z HREF on WPC's Snowband Probability Tracker. As the storm tracks into Quebec this evening, snow will taper off and be limited to just snow showers through Tuesday morning. Another round of snow is likely to occur Tuesday late morning and through the afternoon as a trough axis pivoting on the back side of the storm system in eastern Quebec brings about an additional surge of low- mid level moisture. In addition, steep lapse rates could trigger potent snow showers, especially in the higher terrain of northern New England above 2,000ft. Snow showers look to linger in the northern Appalachians until Wednesday morning when the trough axis moves east and off the New England coast. Any locally heavy snowfall totals (>4" |
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