Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 172333
SWOMCD
SPC MCD 172332
NYZ000-CTZ000-NJZ000-PAZ000-DEZ000-180330-

Mesoscale Discussion 0069
NWS Storm Prediction Center Norman OK
0532 PM CST Sat Feb 17 2018

Areas affected...Southeastern Pennsylvania...Northern New
Jersey...Southern New York...and Western Connecticut

Concerning...Heavy snow

Valid 172332Z - 180330Z

SUMMARY...Snowfall rates around or in excess of 1 inch per hour are
possible for the next few hours this evening from southeastern
Pennsylvania into the New York City vicinity.

DISCUSSION...An approaching mid/upper-level shortwave trough and
low-level warm advection are contributing to ascent across the
region.  As precipitation spreads east-northeastward across the
area, melting/evaporating hydrometeors will eventually saturate and
cool the low-level profiles, resulting in snow reaching the ground.
The latest high-resolution numerical guidance generally supports
snowfall rates around or exceeding 1 inch per hour for the next few
hours, as the system moves rapidly to the east-northeast.

..Jirak.. 02/17/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...BOX...OKX...ALY...PHI...BGM...CTP...

LAT...LON   40407601 41007525 41767390 42007330 41817284 41257290
            40837350 40267456 40027502 39747566 39847600 40407601




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