SPC – says buckle up
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Storm Prediction Center agrees with AL Q
Mesoscale Discussion 0118
NWS Storm Prediction Center Norman OK
0847 AM CST Thu Feb 18 2021
Areas affected…Southeast Pennsylvania…New Jersey…southeast New
York…and portions of southern New England.
Concerning…Heavy snow
Valid 181447Z – 181845Z
SUMMARY…Heavy snow is expected to continue through early afternoon
with snowfall rates up to 2 inches per hour possible.
DISCUSSION…An expansive precipitation associated with broad
isentropic ascent has overspread much of the mid-Atlantic and has
started to move into New England. Moderate snowfall rates are being
observed across much of the region with heavy snowfall currently
being observed in southeast Pennsylvania. This area of heavy
snowfall is expected to pivot northeastward through the morning and
early afternoon across New Jersey and eventually Long Island. The
current transition zone between snow and sleet/freezing rain is near
the Pennsylvania/Maryland border and across far southern New Jersey.
This transition zone is expected to lift northeastward through the
morning into southeast Pennsylvania, central New Jersey, and
possibly to Long Island bringing a mix of freezing rain and sleet to
these regions. Areas to the north of this transition zone are
expected to see the heaviest snowfall rates and likely the greatest!!
