Winter Weather Advisory 5, NWS Philadelphia/Mount Holly

337 
WWUS41 KPHI 040830
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
330 AM EST Sun Feb 4 2018

PAZ060>062-042100-
/O.EXA.KPHI.WW.Y.0005.180204T1500Z-180205T0300Z/
Berks-Lehigh-Northampton-
Including the cities of Reading, Allentown, Bethlehem, and Easton
330 AM EST Sun Feb 4 2018

...WINTER WEATHER ADVISORY IN EFFECT FROM 10 AM THIS MORNING TO
10 PM EST THIS EVENING...

* WHAT...Mixed precipitation expected. Any ice will result in 
  difficult travel conditions. Total snow accumulations of up to 
  one inch and ice accumulations of up to one tenth of an inch are
  expected.

* WHERE...Berks, Lehigh and Northampton counties.

* WHEN...From 10 AM this morning to 10 PM EST this evening.

* ADDITIONAL DETAILS...Snow will change to sleet and freezing
  rain. The freezing rain should change to rain later this
  afternoon. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving. The latest road conditions for the state you are calling
from can be obtained by calling 5 1 1.

$$

PAZ054-055-042100-
/O.CON.KPHI.WW.Y.0005.180204T1500Z-180205T0300Z/
Carbon-Monroe-
Including the cities of Jim Thorpe and Stroudsburg
330 AM EST Sun Feb 4 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 10 AM THIS
MORNING TO 10 PM EST THIS EVENING...

* WHAT...Mixed precipitation expected. Plan on slippery road 
  conditions. Total snow accumulations of 2 to 4 inches and ice 
  accumulations of a light glaze are expected.

* WHERE...Carbon and Monroe counties.

* WHEN...From 10 AM this morning to 10 PM EST this evening.

* ADDITIONAL DETAILS...Be prepared for reduced visibilities at
  times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving. The latest road conditions for the state you are calling
from can be obtained by calling 5 1 1.

$$

For more information from the National Weather Service visit
www.weather.gov/phi/winter

161 
WWUS41 KPHI 041619
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
1119 AM EST Sun Feb 4 2018

PAZ054-055-060>062-050300-
/O.CON.KPHI.WW.Y.0005.000000T0000Z-180205T0300Z/
Carbon-Monroe-Berks-Lehigh-Northampton-
Including the cities of Jim Thorpe, Stroudsburg, Reading, 
Allentown, Bethlehem, and Easton
1119 AM EST Sun Feb 4 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 PM EST THIS
EVENING...

* WHAT...Mixed precipitation occurring. Additional snow 
  accumulations of 1 to 3 inches, with localized amounts up to 6 
  inches in the higher terrain of the southern Poconos, and ice 
  accumulations of a light glaze are expected.

* WHERE...Portions of east central and northeast Pennsylvania.

* WHEN...Snow has begun across the advisory area. Snow may mix
  with freezing rain or sleet in the Poconos before ending late
  this evening. Snow will likely change to freezing rain and sleet
  by mid afternoon in the Lehigh Valley before transitioning to
  rain by this evening. All precipitation should end by around 10
  pm.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Be 
  prepared for reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving. The latest road conditions for the state you are calling
from can be obtained by calling 5 1 1.

$$

For more information from the National Weather Service visit
www.weather.gov/phi/winter

CMS

374 
WWUS41 KPHI 042026
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
326 PM EST Sun Feb 4 2018

PAZ054-055-060>062-050300-
/O.CON.KPHI.WW.Y.0005.000000T0000Z-180205T0300Z/
Carbon-Monroe-Berks-Lehigh-Northampton-
Including the cities of Jim Thorpe, Stroudsburg, Reading, 
Allentown, Bethlehem, and Easton
326 PM EST Sun Feb 4 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 PM EST THIS
EVENING...

* WHAT...Mixed precipitation occurring. Additional wet snow 
  accumulations of 1 to 3 inches and ice accumulations of a light 
  glaze are expected.

* WHERE...Portions of east central and northeast Pennsylvania.

* WHEN...Snow will continue in the southern Poconos through late
  this evening before ending. Snow may become mixed with sleet or
  freezing rain at times. In the Lehigh Valley, a mix of snow,
  sleet, and freezing rain will gradually transition to rain
  before ending late this evening. All precipitation should end by
  around 10 pm.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Be 
  prepared for reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving. The latest road conditions for the state you are calling
from can be obtained by calling 5 1 1.

$$

For more information from the National Weather Service visit
www.weather.gov/phi/winter

CMS

066 
WWUS41 KPHI 042217
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
517 PM EST Sun Feb 4 2018

NJZ001-007>009-PAZ101>106-050300-
/O.EXA.KPHI.WW.Y.0005.000000T0000Z-180205T0300Z/
Sussex-Warren-Morris-Hunterdon-Western Chester-Eastern Chester-
Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Honey Brook, Oxford, West Chester, Kennett Square, 
Collegeville, Pottstown, Norristown, Lansdale, Chalfont, 
Perkasie, Morrisville, and Doylestown
517 PM EST Sun Feb 4 2018

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 10 PM EST THIS
EVENING...

* WHAT...Freezing rain occurring. Ice accumulations of up to one 
  tenth of an inch are expected.

* WHERE...Portions of northwest New Jersey and southeast 
  Pennsylvania.

* WHEN...Through late this evening. Some gradual warming this
  evening should result in the freezing rain changing to rain.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Be 
  prepared for reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving. The latest road conditions for the state you are calling
from can be obtained by calling 5 1 1.

$$

PAZ054-055-060>062-050300-
/O.CON.KPHI.WW.Y.0005.000000T0000Z-180205T0300Z/
Carbon-Monroe-Berks-Lehigh-Northampton-
Including the cities of Jim Thorpe, Stroudsburg, Reading, 
Allentown, Bethlehem, and Easton
517 PM EST Sun Feb 4 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 PM EST THIS
EVENING...

* WHAT...Mixed precipitation occurring. Additional snow and sleet
  accumulations of 1 to 2 inches and ice accumulations of up to 
  one tenth of an inch are expected.

* WHERE...Portions of east central and northeast Pennsylvania.

* WHEN...Snow and sleet will continue in the southern Poconos
  through and should change to freezing rain before ending. In the
  Lehigh Valley including Berks County, freezing rain and some
  sleet will gradually transition to rain before ending late this
  evening. All precipitation should end by around 10 pm.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Be 
  prepared for reduced visibilities at times.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving. The latest road conditions for the state you are calling
from can be obtained by calling 5 1 1.

$$

For more information from the National Weather Service visit
www.weather.gov/phi/winter

478 
WWUS41 KPHI 050237
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
937 PM EST Sun Feb 4 2018

NJZ001-007>009-PAZ054-055-060>062-101>106-050345-
/O.CAN.KPHI.WW.Y.0005.000000T0000Z-180205T0300Z/
Sussex-Warren-Morris-Hunterdon-Carbon-Monroe-Berks-Lehigh-
Northampton-Western Chester-Eastern Chester-Western Montgomery-
Eastern Montgomery-Upper Bucks-Lower Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Jim Thorpe, Stroudsburg, Reading, Allentown, 
Bethlehem, Easton, Honey Brook, Oxford, West Chester, 
Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, 
Chalfont, Perkasie, Morrisville, and Doylestown
937 PM EST Sun Feb 4 2018

...WINTER WEATHER ADVISORY IS CANCELLED...

Temperatures are mainly just above freezing and the precipitation
will continue to rapidly end from southwest to northeast this 
evening. As a result, the Winter Weather Advisory has been 
cancelled.

$$

For more information from the National Weather Service visit
www.weather.gov/phi/winter

Area Forecast Discussion
National Weather Service Mount Holly NJ
254 PM EST Sat Feb 3 2018

.SYNOPSIS...
Large high pressure will build towards our region through the day,
before moving off shore later today. Low pressure propagating across
the Great Lakes region will bring a cold front through our region
Sunday night. High pressure briefly builds in over the region,
before another cold front arrives on Wednesday. Another area of high
pressure will build over the region to close out the work week.

&&

.NEAR TERM /THROUGH TONIGHT/...
A series of vorticity maxima will be approaching the region
during the next 24 hours, and the tropospheric flow will respond
by developing considerable warm-air advection along much of the
Eastern Seaboard overnight. The associated large-scale lift will
generate increasing cloudiness rather steadily overnight, with
overcast conditions likely by daybreak. There will be a quick
fall in temperatures this evening, but this will cease early as
the clouds temper radiational cooling and the warm advection
begins to reverse the process overnight.

The low-temperature forecast is low-confidence because of the
critical timing of the low clouds. Suspect some of the more
susceptible spots may have considerable deviations from the
hourly temperatures at times owing to highly localized,
difficult-to-model warming/cooling processes.

The main surface low will be in the Southeast at 12Z Sunday,
with a pivoting vort max approaching the Great Lakes. The
strongest ascent will remain well west and south of the area
through this time, so no PoPs tonight. Expect temperatures
tomorrow morning to be sitting very close to this afternoon's
highs.

&&

.SHORT TERM /SUNDAY/...
Quick-hitting storm system will affect the area on Sunday. A
vort max in the Great Lakes pivots into a more neutral tilt as
a surface low in the Southeast races northeastward into the
Mid-Atlantic during the day. Considerable large-scale ascent
will aid in the development of widespread precipitation, aided
by strong differential cyclonic vorticity advection downstream
of the vort max, sustained warm/moist advection in the low
levels, and upper-level divergence in the right-entrance region
of a departing (anticyclonic) jet streak in New England. One of
the primary questions with this system is the competing factors
of strength of low-level warm advection versus cold-air damming
processes that may keep near-surface temperatures much cooler
than the models are projecting.

Model trends today are a little cooler and a little wetter, and
the forecast generally followed suit.

Unfortunately, there are still some variations model to model,
with the NAM/ECMWF on the colder side and the GFS on the warmer
side. Given the evolving pattern, considerable warm/moist
advection will likely increase temperatures just aloft readily,
so the stronger freezing rain/sleet signal from the higher-
resolution guidance cannot be ignored. However, with surface
temperatures likely edging above freezing from the Lehigh Valley
southeastward as the snow transitions, currently expect few or
no societal impacts southeast of the southern Poconos. As such,
no advisory was issued for the Lehigh Valley for this event (for
now). If variability lessens and solutions trend colder, this
may need to be reconsidered in later forecasts.

On the other hand, the colder look to the NAM/ECMWF also
suggests a more prolonged duration of snow in the southern
Poconos. Combined with the slightly wetter consensus, there is
enough confidence to issue a winter weather advisory for Carbon
and Monroe Counties. Snow amounts may be marginal if the warmer
solutions verify, but warm air will intrude into the air just
above the surface during a portion of the event, and this will
likely be enough to generate light icing (at least briefly).
Snow ratios will be on the lower side given parcel trajectories,
so despite the decent QPF (up to a half inch through 00Z
Monday), snow totals should not get out of hand.

For the rest of the area (i.e., southeast of the Fall Line),
plain rain looks like the main mode, though there may be a brief
window of a wintry mix in the northwest suburbs to start with.
Should that occur, impacts would be minimal, as surface
temperatures will warm sufficiently above freezing during the
late morning and afternoon. Generally a quarter to half inch of
rain is expected Sunday afternoon across the area. Onset of the
steadier precipitation should generally be between 10 am and 1
pm, though there is a chance for a quick sprinkle/flurry
earlier in the day, according to the NAM Nest.

Temperatures will rise slowly during the day to around freezing
in the southern Poconos to the mid/upper 30s for the Lehigh
Valley and northwest suburbs to the 40s along/southeast of I-95.

&&

.LONG TERM /SUNDAY NIGHT THROUGH SATURDAY/...
Update out around 4 pm...

A familiar pattern is developing, not once, but twice in the
long term with precipitation in the warm sector with warm air
advection, followed closely by a cold front.

Sunday...Through the day Sunday, we will see warm air advection.
The models still depict the low starting off as a two lows, one
moving across the Ohio Valley into the lower Great Lakes region,
and one moving across southern Canada. In a change from
previous runs, the models are now depicting the Ohio Valley low
taking longer to become the dominant low. Consequently, the main
area of warm air advection could be centered over the Delaware
Valley and coastal plains during the afternoon. If it develops
this way, that would reduce the chance of seeing sleet or
freezing rain across the southern Poconos and Lehigh Valley as
they will likely not have a significant low or mid level warm
layer. Though model soundings still depict a temperature
inversion (around 900 to 850 mb) through this time, it is still
below freezing. This also means that portions of this area
(especially the higher terrain in the Poconos) have less of a
chance to see a change over to rain as boundary layer warm air
advection will be limited as well. Therefore, have taken out
the mention of freezing rain in the main forecast, but will
continue to mention in the Hazardous weather outlook in the
event that the models trend quicker with the intensification of
the Ohio Valley low.

For the rest of the region, precipitation type forecast is much
simpler, with precip now not expected to move in until at least
mid morning (for most of the area), the precipitation will
likely be all rain through the day Sunday and into Sunday
evening.

Sunday night...Some disagreement on the timing of the cold
front, but it looks to be generally through the later half of
the night. In addition to strong cold air advection, models are
showing significant dry air advection with the front.
Consequently, there should be little, if any, precipitation
behind the front. If precip lingers for a few hours behind the
front, areas along the I95 corridor and coastal plains could
still see a very brief changeover to all snow, but the chances
of that are decreasing from previous forecasts.

Monday and Tuesday...Should be mostly dry and cold. There is a
slight chance of lake effect snow showers in the strong
northwesterly flow on Monday, and another slight chance of snow
showers during the day on Tuesday as a low level trough slides
from the Great Lakes into Quebec, but with hardly any moisture
advection through that period, it will likely not amount to
much.

Tuesday night and Wednesday...Once again we see a pattern of
warm air advection and precipitation during the day, followed
closely by a cold front. The main difference with this period is
that the models are depicting the cold front arriving faster,
by Wednesday evening. We will be watching the trends on the
timing with this system closely over the next few days. For now,
mostly rain looks likely through the day, with a chance that
precip will linger long enough to change over to snow Wednesday
night.

Thursday through Saturday...We should see a brief return to
tranquil weather Thursday and Friday. Depending on where a mid
and upper level jet develops late Friday into Saturday, we could
have another chance for precipitation if we are close enough to
the right entrance region of the jet.

&&

.AVIATION /20Z SATURDAY THROUGH THURSDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG, KILG,
KMIV, KACY and surrounding areas.

This afternoon...VFR with southwest winds 7 to 15 kts with
occasional gusts to 20 kts. High confidence.

Tonight...VFR with increasing clouds and CIGs lowering to
between 5000 and 10,000 feet by daybreak. Winds becoming south
around 5 to 10 kts. Moderate confidence.

Sunday...Conditions deteriorating to MVFR or IFR by late morning
or afternoon with rain moving through the area during the
afternoon. There may be a brief start as snow at RDG/ABE before
transition to rain, but little or no accumulations are expected
at this time. Winds generally between east and south around or
below 10 kts. Moderate confidence on overall evolution, but low
confidence on timing.

Outlook...

Sunday night...MVFR or lower conditions will improve quickly to
VFR with a cold front Sunday night. Will also see an abrupt
shift from southerly to northwesterly winds of 10 to 15 KT with
gusts up to 25 KT. Moderate confidence on flight category, but
very uncertain on the timing of the front.

Monday and Tuesday...Mostly VFR conditions. However, there is a
slight chance of snow showers at KABE and KRDG on Tuesday.
Gusty northwesterly winds on Monday, decreasing and becoming
southerly on Tuesday. Moderate confidence.

Tuesday night and Wednesday...Conditions lowering to MVFR,
possibly IFR, as low clouds and rain move in. Could see
precipitation starting as a rain/snow mix especially for KRDG
and KABE. Moderate confidence on the flight category.

&&

.MARINE...
Marginal small craft advisory conditions are expected to return
for a brief duration overnight into early Sunday morning.
Hoisted an advisory for the northern and central New Jersey
coastal waters from 10 pm to 9 am to cover this threat. There is
definitely going to be a lull in winds/seas late tomorrow
morning and afternoon, so think no advisory should be present
during this time before winds/seas ramp up in earnest Sunday
evening.

Rain will spread rapidly from southwest to northeast late
tomorrow morning and afternoon, with a steady rain likely
shortly after onset. Visibility restrictions will be possible in
the steadier rain.

Outlook...

Sunday night and Monday...Will see an abrupt shift to
northwesterly winds, with SCA conditions likely, and gale force
gusts possible, at least for part of the time through this
period.

Monday night through Tuesday...Winds and seas should stay below
SCA criteria

Wednesday....Increasing winds and seas with SCA conditions
possible.

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Winter Weather Advisory from 10 AM to 10 PM EST Sunday for
     PAZ054-055.
NJ...None.
DE...None.
MD...None.
MARINE...Gale Watch from Monday morning through Monday afternoon for
     ANZ431-450>455.

&&

Synopsis...Johnson
Near Term...CMS
Short Term...CMS
Long Term...Johnson
Aviation...CMS/Johnson
Marine...CMS/Johnson

Hazardous Weather Outlook
National Weather Service Mount Holly NJ
407 AM EST Sat Feb 3 2018

NJZ001-007-PAZ054-055-060>062-040915-
Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton-
407 AM EST Sat Feb 3 2018

This Hazardous Weather Outlook is for northern New Jersey, east
central Pennsylvania and northeast Pennsylvania.

.DAY ONE...Today and Tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

A period of snow is likely Sunday through Sunday evening. Freezing
rain or sleet may mix in for a brief period. Snow amounts of up to 4
inches are possible. Hazardous travel conditions due to the snow and
slippery conditions is possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

DEZ001>004-MDZ008-012-015-019-020-NJZ008>010-012>027-PAZ070-071-
101>106-040915-
New Castle-Kent-Inland Sussex-Delaware Beaches-Cecil-Kent MD-
Queen Annes-Talbot-Caroline-Morris-Hunterdon-Somerset-Middlesex-
Western Monmouth-Eastern Monmouth-Mercer-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May-
Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean-
Southeastern Burlington-Delaware-Philadelphia-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
Lower Bucks-
407 AM EST Sat Feb 3 2018

This Hazardous Weather Outlook is for central Delaware, northern
Delaware, southern Delaware, northeast Maryland, central New
Jersey, northern New Jersey, northwest New Jersey, southern New
Jersey and southeast Pennsylvania.

.DAY ONE...Today and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ430-431-450>455-040915-
Delaware Bay waters north of East Point NJ to Slaughter Beach DE-
Delaware Bay waters south of East Point NJ to Slaughter Beach DE-
Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm-
Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm-
Coastal waters from Little Egg Inlet to Great Egg Inlet NJ out 20 nm-
Coastal waters from Great Egg Inlet to Cape May NJ out 20 nm-
Coastal waters from Cape May NJ to Cape Henlopen DE out 20 nm-
Coastal waters from Cape Henlopen to Fenwick Island DE out 20 nm-
407 AM EST Sat Feb 3 2018

This Hazardous Weather Outlook is for Atlantic coastal waters and
Delaware Bay Waters.

.DAY ONE...Today and Tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Gale force northwesterly wind gusts are possible Sunday night into
Monday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.