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Mesoscale Discussion 0006
NWS Storm Prediction Center Norman OK
1034 AM CST Thu Jan 04 2018
Areas affected...NH into southern and central ME
Valid 041634Z - 042130Z
SUMMARY...Heavy snowfall rates (of at least 1"/hour) are spreading
northward across New Hampshire and through southern into central
Maine through the afternoon and early evening. Higher rates of
2-3"/hour expected into PWM between 19-22Z and MLT between 21-00Z.
In addition to heavy snowfall rates, the intensifying storm system
will result in strengthening winds to produce blizzard conditions
across coastal regions of New England.
DISCUSSION...Heavy snowfall rates will continue to spread to the
west and north across NH into the early afternoon associated with a
snow band extending from western CT to southern NH/southwest ME per
mosaic radar. A second frontogenetic band is expected to develop by
early afternoon from northeast MA to coastal and southern ME. The
forcing for ascent attendant to the second frontogenetic band is
expected to enhance snowfall rates into the 2-3" per hour range by
19Z across southern ME and then by 21Z into central ME as this band
shifts poleward. Forecast soundings suggest the increase in upward
vertical motion should occur within the dentritic-growth zone,
enhancing snowfall rates, while steepening midlevel lapse rates
could support upright convection/thundersnow potential.
The heavy snowfall rates are associated with a strong, dynamic
winter storm affecting New England through today into this evening.
Further deepening of the surface low is expected (1 MB/hour) through
21Z, as it tracks to the north-northeast, reaching the Atlantic
waters southeast of Cape Cod (approximately 41N/69W).
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 42867252 43777204 44807120 45427028 45716943 45886855
45736763 45116725 44906719 44656734 44056874 43417033
42827084 42687161 42707210 42867252
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