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Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Wintry Weather Monday and
Tuesday
What Has Changed?
Axis of highest ice amounts shifted
slightly south
Snow amounts increased over the
Poconos and NW NJ
Decision Support Briefing #3
As of: 4 AM Monday, December 16, 2019
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Main Points
Hazard Impacts Location Timing
SnowUp to 4 inches of snow mixed
with sleet and freezing rain will
result in slippery roads
Highest amounts (2- 4
inches) over the
southern Poconos and
NW NJ. A coating up to
2 inches farther south
Periods of light snow moving
in this morning before mixing
with sleet, freezing rain, and
rain this afternoon and
tonight.
Freezing
Rain
Up to one quarter inch of ice,
coming on top of snow will
result very hazardous conditions
on area roads.
Mainly North and west
of the I-95 corridor, with
the highest amounts in
the Lehigh Valley into
NW NJ.
Snow and sleet are expected
to change over to freezing
rain during the afternoon and
evening, continuing into
Tuesday morning. This will
affect both the Monday
afternoon and Tuesday
morning commutes.
Wind
Wind gusts up to 25 mph could
lead to minor tree damage
where ice has accumulated on
trees. This is expected to be
after most of the precipitation
has fallen.
Although wind gusts up
to 25 mph are possible
area wide, the areas that
may still have ice on the
trees by Tuesday should
be the southern
Poconos into NW NJ
Starting late Tuesday
morning continuing through
early Tuesday evening.
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Freezing Rain: Mainly west of I-95
Wind: Southern Poconos and NW NJ
Snow: Mainly along and west of I-95 corridor
None Limited Elevated Significant Extreme
Summary of Greatest Impacts
None Limited Elevated Significant Extreme
None Limited Elevated Significant Extreme
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Expected Snowfall Accumulation
Uncertainty in Snowfall Forecast:
Exact amounts are highly
dependent on the timing of the
changeover, which remains
somewhat uncertain.
Regardless of exact amounts,
hazardous driving conditions are
likely with any ice coming on top of
snow.
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Expected Ice Accumulation
Uncertainty in Ice Forecast:
Exact amounts are highly
dependent on the timing of the
changeover, which remains
somewhat uncertain.
Some light icing could occur farther
south and east if temperatures are
colder.
Regardless of exact amounts,
hazardous driving conditions are
likely with any ice coming on top of
snow.
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Snow
Wintry Mix
Rain
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Snow
Wintry Mix
Rain
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Rain
Wintry Mix
Snow
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Rain
Freezing Rain
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Snow moves into the region this morning changing over to a wintry mix during
the afternoon. For much of the advisory area; wintry mix changes to freezing
rain this evening.
A period of snow may move in faster for far northeast MD and northern DE into
far southwestern NJ early this morning. This could have more of an impact on
the Monday morning commute.
Snow and ice amounts will be highly dependent on the timing of precipitation
type changes.
Areas in the advisory are expected to have very slippery conditions due
to ice/sleet coming on top of snow. The greatest impacts are anticipated to
be north and west of I-95, with a potentially prolonged icing event for the Lehigh
Valley, southern Poconos into far northwestern NJ. The Monday evening and
Tuesday commutes may be affected. Bridges and overpasses will be especially
slippery.
Gusts up to 25 mph are possible Tuesday, which could lead to minor tree
damage in areas where ice has accumulated on the trees.
Event Summary
Philadelphia/Mount HollyWeather Forecast Office Presentation Created
12/16/2019 4:27 AM@NWS_MountHolly NWSMountHolly
Web:
www.weather.gov/phi
Phone (public):
(609) 261-6600
Facebook:
NWSMountHolly
Twitter:
@NWS_MountHolly
Contact and Next Briefing Information
Briefing Webpage:
www.weather.gov/media/phi/current_briefing.pdf
Next Briefing When: By 5 PM Monday
Disclaimer: The information contained within this briefing
is time-sensitive; do not use after the next briefing package issuance