Wintry Weather Monday and Tuesday...Weather Forecast Office Presentation Created @NWS_MountHolly...

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

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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.





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







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.





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.





Snow

Wintry Mix

Rain





Rain

Wintry Mix

Snow





Rain

Freezing Rain





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





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



Wintry Weather Monday and Tuesday...Weather Forecast Office Presentation Created @NWS_MountHolly...

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