Alert archive / New Jersey / Winter Weather Advisories in 2018

Winter Weather Advisory 8, NWS Philadelphia/Mount Holly

February 17, 20184 states

NWS Philadelphia/Mount Holly issued this winter weather advisory at Feb 17, 2018, 3:45 AM EST for 4 states. It took effect at Feb 17, 2018, 4:00 PM EST. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Feb 17, 2018, 3:45 AM EST (08:45 UTC)
In effect from
Feb 17, 2018, 4:00 PM EST
Expired
Feb 18, 2018, 12:05 AM EST
In force
8 hr
Issued by
NWS Philadelphia/Mount Holly
All 24 counties

New Castle County, DE, Cecil County, MD, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Salem County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Chester County, PA, Delaware County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 74 km from the middle of the area, began a volume at 08:49 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 8.8 hours before the alert went out and 202 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2018-02-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2018-02-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -259 square meters per square second.1939587897117136156175Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1039 m above ground
0-6 km bulk shear
127 kt
0-1 km storm-relative helicity
-259 m²/s²
0-3 km storm-relative helicity
-104 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

860 
WWUS41 KPHI 170845
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
345 AM EST Sat Feb 17 2018

NJZ001-007>010-012-015-PAZ054-055-060>062-101>106-172100-
/O.UPG.KPHI.WS.A.0003.180217T2100Z-180218T0900Z/
/O.NEW.KPHI.WW.Y.0008.180217T2100Z-180218T0900Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-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, Somerville, New Brunswick, Trenton, Jim Thorpe, 
Stroudsburg, Reading, Allentown, Bethlehem, Easton, Honey Brook, 
Oxford, West Chester, Kennett Square, Collegeville, Pottstown, 
Norristown, Lansdale, Chalfont, Perkasie, Morrisville, 
and Doylestown
345 AM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO
4 AM EST SUNDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 5 
  inches are expected.

* WHERE...Most of eastern Pennsylvania and northern New Jersey.

* WHEN...Snow quickly overspreads the area from the southwest
  between around mid afternoon, becoming moderate to potentially
  heavy at times this evening. The snow should quickly by 4 AM.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. Be
  prepared for reduced visibilities at times. The snow may fall at
  up to an inch per hour at times in parts of the region, which 
  would result in rapid deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
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.

&&

$$

NJZ013-172100-
/O.UPG.KPHI.WS.A.0003.180217T2100Z-180218T0900Z/
/O.NEW.KPHI.WW.Y.0008.180217T2100Z-180218T0900Z/
Western Monmouth-
Including the city of Freehold
345 AM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO
4 AM EST SUNDAY...

* WHAT...Snow mixed with rain at times expected. Total snow 
  accumulations of 2 to 3 inches are expected.

* WHERE...Western Monmouth county.

* WHEN...Snow mixed with rain develops late this afternoon and
  continues through this evening. All snow will occur at times and
  could be moderate to heavy, however rain and sleet may mix in 
  again late this evening before the precipitation ends after 
  midnight.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
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.

&&

$$

DEZ001-MDZ008-NJZ016>019-PAZ070-071-172100-
/O.NEW.KPHI.WW.Y.0008.180217T2100Z-180218T0900Z/
New Castle-Cecil-Salem-Gloucester-Camden-Northwestern Burlington-
Delaware-Philadelphia-
Including the cities of Wilmington, Elkton, Pennsville, 
Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, 
and Philadelphia
345 AM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO
4 AM EST SUNDAY...

* WHAT...Wet snow expected. Total wet snow accumulations of 2 to 
  3 inches are expected.

* WHERE...Far southeastern Pennsylvania, portions of southern New
  Jersey, northeast Maryland and northern Delaware.

* WHEN...Snow mixed with rain develops later this afternoon from 
  the southwest and changes over to wet snow for many areas, some 
  of which could be moderate to heavy at times. Some rain and 
  sleet may mix in at times through this evening, before the 
  precipitation ends after midnight.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Be
  prepared for reduced visibilities at times. A burst of snow this
  evening would allow for more efficient accumulations and 
  deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for wet snow means periods of wet snow
will cause primarily travel difficulties. Be prepared for snow
covered 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
5 follow-up statements
333 
WWUS41 KPHI 171402
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
902 AM EST Sat Feb 17 2018

NJZ001-007>010-012-015-PAZ054-055-060>062-101>106-172300-
/O.CON.KPHI.WW.Y.0008.180217T2100Z-180218T0900Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-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, Somerville, New Brunswick, Trenton, Jim Thorpe, 
Stroudsburg, Reading, Allentown, Bethlehem, Easton, Honey Brook, 
Oxford, West Chester, Kennett Square, Collegeville, Pottstown, 
Norristown, Lansdale, Chalfont, Perkasie, Morrisville, 
and Doylestown
902 AM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 4 PM THIS 
AFTERNOON TO 4 AM EST SUNDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 5 inches
  are expected.

* WHERE...Most of eastern Pennsylvania and northern New Jersey.

* WHEN...Snow quickly overspreads the area from the southwest 
  between around mid afternoon, becoming moderate to potentially 
  heavy at times this evening. The snow should quickly by 4 AM.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. Be 
  prepared for reduced visibilities at times. The snow may fall at
  up to an inch per hour at times in parts of the region, which 
  would result in rapid deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will 
cause primarily travel difficulties. Be prepared for snow covered 
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.

&&

$$

DEZ001-MDZ008-NJZ013-016>019-PAZ070-071-172300-
/O.CON.KPHI.WW.Y.0008.180217T2100Z-180218T0900Z/
New Castle-Cecil-Western Monmouth-Salem-Gloucester-Camden-
Northwestern Burlington-Delaware-Philadelphia-
Including the cities of Wilmington, Elkton, Freehold, Pennsville,
Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, 
and Philadelphia
902 AM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 4 PM THIS 
AFTERNOON TO 4 AM EST SUNDAY...

* WHAT...Wet snow expected. Total wet snow accumulations of 2 to 
  3 inches are expected.

* WHERE...Far southeastern Pennsylvania, portions of southern New
  Jersey, northeast Maryland and northern Delaware.

* WHEN...Snow mixed with rain develops later this afternoon from 
  the southwest and changes over to wet snow for many areas, some 
  of which could be moderate to heavy at times. Some rain and 
  sleet may mix in at times through this evening, before the 
  precipitation ends after midnight.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Be 
  prepared for reduced visibilities at times. A burst of snow this
  evening would allow for more efficient accumulations and 
  deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will 
cause primarily travel difficulties. Be prepared for snow covered 
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
531 
WWUS41 KPHI 172020
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
320 PM EST Sat Feb 17 2018



NJZ001-007>010-012-015-PAZ054-055-060>062-101>106-180430-
/O.CON.KPHI.WW.Y.0008.180217T2100Z-180218T0900Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-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, Somerville, New Brunswick, Trenton, Jim Thorpe, 
Stroudsburg, Reading, Allentown, Bethlehem, Easton, Honey Brook, 
Oxford, West Chester, Kennett Square, Collegeville, Pottstown, 
Norristown, Lansdale, Chalfont, Perkasie, Morrisville, 
and Doylestown
320 PM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM EST
SUNDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 5 
  inches are expected.

* WHERE...Portions of central, northern and northwest New Jersey 
  and east central, northeast and southeast Pennsylvania.

* WHEN...Until 4 AM EST Sunday. The heaviest snow is expected
  through the evening hours.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. Be
  prepared for reduced visibilities at times. The snow may fall 
  at up to an inch per hour at times in parts of the region, which
  would result in rapid deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
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.

&&

$$

DEZ001-MDZ008-NJZ013-016>019-PAZ070-071-180430-
/O.CON.KPHI.WW.Y.0008.180217T2100Z-180218T0900Z/
New Castle-Cecil-Western Monmouth-Salem-Gloucester-Camden-
Northwestern Burlington-Delaware-Philadelphia-
Including the cities of Wilmington, Elkton, Freehold, Pennsville,
Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, 
and Philadelphia
320 PM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM EST
SUNDAY...

* WHAT...Snow expected. Total snow accumulations of around 2 
  inches, with localized amounts up to 4 inches, are expected.

* WHERE...Portions of central and southern New Jersey, southeast 
  Pennsylvania, northeast Maryland and northern Delaware.

* WHEN...Until 4 AM EST Sunday. The heaviest snow is expected
  through the evening hours.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Be
  prepared for reduced visibilities at times. A burst of heavy 
  snow this evening would allow for more efficient accumulations 
  and deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
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
999 
WWUS41 KPHI 180041
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
741 PM EST Sat Feb 17 2018


NJZ001-007>010-PAZ054-055-060>062-103-105-180900-
/O.UPG.KPHI.WW.Y.0008.000000T0000Z-180218T0900Z/
/O.NEW.KPHI.WS.W.0004.180218T0041Z-180218T0900Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Berks-
Lehigh-Northampton-Western Montgomery-Upper Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, Jim Thorpe, Stroudsburg, Reading, 
Allentown, Bethlehem, Easton, Collegeville, Pottstown, Chalfont, 
and Perkasie
741 PM EST Sat Feb 17 2018

...WINTER STORM WARNING IN EFFECT UNTIL 4 AM EST SUNDAY...

* WHAT...Heavy snow. Total snow accumulations of around 6 inches 
  are expected.

* WHERE...Portions of northern and northwest New Jersey and east 
  central, northeast and southeast Pennsylvania.

* WHEN...Until 4 AM EST Sunday.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. Be
  prepared for significant reductions in visibility at times. The
  snow may fall at 1 to 2 inches per hour at times in parts of the
  region, resulting in rapidly deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

NJZ012-015-PAZ101-102-104-106-180900-
/O.CON.KPHI.WW.Y.0008.000000T0000Z-180218T0900Z/
Middlesex-Mercer-Western Chester-Eastern Chester-
Eastern Montgomery-Lower Bucks-
Including the cities of New Brunswick, Trenton, Honey Brook, 
Oxford, West Chester, Kennett Square, Norristown, Lansdale, 
Morrisville, and Doylestown
741 PM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM EST
SUNDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 5 
  inches are expected.

* WHERE...Portions of central and northern New Jersey and
  southeast Pennsylvania.

* WHEN...Until 4 AM EST Sunday. The heaviest snow is expected 
  through the evening hours.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. Be 
  prepared for reduced visibilities at times. The snow may fall 
  at up to an inch per hour at times in parts of the region, 
  which would result in rapid deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
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.

&&

$$

DEZ001-MDZ008-NJZ013-016>019-PAZ070-071-180900-
/O.CON.KPHI.WW.Y.0008.000000T0000Z-180218T0900Z/
New Castle-Cecil-Western Monmouth-Salem-Gloucester-Camden-
Northwestern Burlington-Delaware-Philadelphia-
Including the cities of Wilmington, Elkton, Freehold, Pennsville,
Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, 
and Philadelphia
741 PM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM EST
SUNDAY...

* WHAT...Snow expected. Total snow accumulations of around 2 
  inches, with localized amounts up to 4 inches, are expected.

* WHERE...Portions of central and southern New Jersey, southeast 
  Pennsylvania, northeast Maryland and northern Delaware.

* WHEN...Until 4 AM EST Sunday. The heaviest snow is expected 
  through the evening hours.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Be 
  prepared for reduced visibilities at times. A burst of heavy 
  snow this evening would allow for more efficient accumulations 
  and deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for wet snow means periods of wet snow
will cause primarily travel difficulties. Be prepared for snow
covered 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
643 
WWUS41 KPHI 180251
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
951 PM EST Sat Feb 17 2018


PAZ060-103-180400-
/O.CAN.KPHI.WS.W.0004.000000T0000Z-180218T0900Z/
Berks-Western Montgomery-
Including the cities of Reading, Collegeville, and Pottstown
951 PM EST Sat Feb 17 2018

...WINTER STORM WARNING IS CANCELLED...

Heavy snow has ended. Light snow or snow showers may continue for
a few more hours.

$$

DEZ001-MDZ008-NJZ016>018-PAZ070-071-101-102-104-180400-
/O.CAN.KPHI.WW.Y.0008.000000T0000Z-180218T0900Z/
New Castle-Cecil-Salem-Gloucester-Camden-Delaware-Philadelphia-
Western Chester-Eastern Chester-Eastern Montgomery-
Including the cities of Wilmington, Elkton, Pennsville, 
Glassboro, Camden, Cherry Hill, Media, Philadelphia, Honey Brook,
Oxford, West Chester, Kennett Square, Norristown, and Lansdale
951 PM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY IS CANCELLED...

Heavy snow has ended. Light snow or snow showers may continue for
a few more hours.

$$

NJZ001-007>010-PAZ054-055-061-062-105-180900-
/O.CON.KPHI.WS.W.0004.000000T0000Z-180218T0900Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Lehigh-
Northampton-Upper Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, Jim Thorpe, Stroudsburg, Allentown, 
Bethlehem, Easton, Chalfont, and Perkasie
951 PM EST Sat Feb 17 2018

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 AM EST SUNDAY...

* WHAT...Heavy snow. Total snow accumulations of 6 to 8 inches 
  are expected.

* WHERE...Portions of northern and northwest New Jersey and east 
  central, northeast and southeast Pennsylvania.

* WHEN...Until 4 AM EST Sunday. Heavier snow should end by
  midnight. 

* ADDITIONAL DETAILS...Plan on difficult travel conditions. Be 
  prepared for significant reductions in visibility at times. 
  The snow may fall at 1 to 2 inches per hour at times in parts 
  of the region, resulting in rapidly deteriorating road 
  conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning for snow means severe winter weather
conditions will make travel very hazardous or impossible. If you
must travel, keep an extra flashlight, food and water in your
vehicle in case of an emergency. The latest road conditions for
the state you are calling from can be obtained by calling 5 1 1.

&&

$$

NJZ012-015-PAZ106-180900-
/O.CON.KPHI.WW.Y.0008.000000T0000Z-180218T0900Z/
Middlesex-Mercer-Lower Bucks-
Including the cities of New Brunswick, Trenton, Morrisville, 
and Doylestown
951 PM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM EST
SUNDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 5 
  inches are expected.

* WHERE...Portions of central and northern New Jersey and 
  southeast Pennsylvania.

* WHEN...Until 4 AM EST Sunday. The heaviest snow is expected 
  through the late evening hours.

* ADDITIONAL DETAILS...Plan on difficult travel conditions. Be 
  prepared for reduced visibilities at times. The snow may fall 
  at up to an inch per hour at times in parts of the region, 
  which would result in rapid deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for snow means periods of snow will
cause primarily travel difficulties. Be prepared for snow covered
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.

&&

$$

NJZ013-019-180900-
/O.CON.KPHI.WW.Y.0008.000000T0000Z-180218T0900Z/
Western Monmouth-Northwestern Burlington-
Including the cities of Freehold, Moorestown, and Mount Holly
951 PM EST Sat Feb 17 2018

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM EST
SUNDAY...

* WHAT...Snow expected. Total snow accumulations of around 2
  inches are expected.

* WHERE...Portions of central and southern New Jersey, southeast 
  Pennsylvania, northeast Maryland and northern Delaware.

* WHEN...Until 4 AM EST Sunday. The heaviest snow is expected 
  through the late evening hours.

* ADDITIONAL DETAILS...Plan on slippery road conditions. Be 
  prepared for reduced visibilities at times. A burst of heavy 
  snow this evening would allow for more efficient accumulations 
  and deteriorating road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory for wet snow means periods of wet snow
will cause primarily travel difficulties. Be prepared for snow
covered 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
863 
WWUS41 KPHI 180505
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
1205 AM EST Sun Feb 18 2018

NJZ001-007>010-PAZ054-055-061-062-105-180615-
/O.CAN.KPHI.WS.W.0004.000000T0000Z-180218T0900Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Lehigh-
Northampton-Upper Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, Jim Thorpe, Stroudsburg, Allentown, 
Bethlehem, Easton, Chalfont, and Perkasie
1205 AM EST Sun Feb 18 2018

...WINTER STORM WARNING IS CANCELLED...

Some light snow showers may persist for a couple more hours,
however the accumulating snow has ended. While the warning has
been cancelled, still use caution while traveling tonight as 
untreated surfaces can be slippery.

$$

NJZ012-013-015-019-PAZ106-180615-
/O.CAN.KPHI.WW.Y.0008.000000T0000Z-180218T0900Z/
Middlesex-Western Monmouth-Mercer-Northwestern Burlington-
Lower Bucks-
Including the cities of New Brunswick, Freehold, Trenton, 
Moorestown, Mount Holly, Morrisville, and Doylestown
1205 AM EST Sun Feb 18 2018

...WINTER WEATHER ADVISORY IS CANCELLED...

While the advisory has been cancelled, use caution while 
traveling tonight as untreated surfaces can still be slippery.

$$

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

What forecasters said that day

The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this winter weather advisory went out at Feb 17, 12:52 AM EST, 2 hours 53 minutes earlier.

Area forecast discussion, Feb 17, 12:52 AM EST, 2 hours 53 minutes before
Area Forecast Discussion
National Weather Service Mount Holly NJ
1252 AM EST Sat Feb 17 2018

.SYNOPSIS...
High pressure builds into the area overnight, then offshore on
Saturday. An area of low pressure will approach the area from
the south later Saturday into Saturday night. High pressure
briefly builds across the area again Sunday, then offshore
Sunday night. A warm front is expected to lift across into the
area later Monday into early Tuesday, followed by a cold front
Wednesday into Wednesday night. This front will sag to our south
Thursday and Thursday night as high pressure builds to our
north.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY/...
The cold front is now well offshore. Skies have mostly cleared
thanks to the dry air advection in northwesterly flow. Tonight's
lows are forecast to range from around 20 in the Poconos and in
far northern New Jersey to the lower 30s in southern Delaware.

The northwest wind should dry most roads and walkways before
temperatures fall below freezing. However, larger puddles will
remain and there could be some patchy ice in spots.

&&

.SHORT TERM /SATURDAY THROUGH SATURDAY NIGHT/...
High pressure is forecast to be centered in eastern Pennsylvania
early on Saturday morning. The high is forecast to move eastward
passing off Cape Cod around midday. Dry weather is anticipated
for the morning with an increase in high clouds ahead of our
next weather system.

Precipitation is expected to spread into our region from the
southwest during the mid to late afternoon hours. Temperatures
should favor the upper 30s and the lower 40s in our region at
the onset. As a result, the precipitation will begin as rain at
most locations.

As we lose daylight on Saturday evening and as precipitation
rates increase, the precipitation should change to all snow
except in our far southern counties. The precipitation rates are
expected to be enhanced by some short wave energy that is being
ejected out of the southwestern states.

We are anticipating a relatively brief but robust precipitation
event for late Saturday into Saturday night. The bulk of the
precipitation is forecast to fall over an 8 hour period. The
surface low is expected to move rapidly from around Cape
Hatteras on Saturday evening to a point about 250 miles
southeast of Cape Cod near daybreak on Sunday.

Snowfall totals are expected to range from 2 to 5 inches in
southeastern Pennsylvania, the Lehigh Valley, the Poconos, and
northern and central New Jersey. Because of the potential for
mesoscale banding, expect some locations within the watch area
will see 6 inches or more. However, it is still far too
uncertain to pin down where the banding will take place. Thus,
have held on to the winter storm watch. An advisory may be
needed for another tier or two of counties to the southeast of
the current watch area as well, but in those areas there is
considerable uncertainty as to how early and how long we will
see a change over to snow.

A fairly tight snowfall gradient is forecast to extend across
the upper Delmarva and southern New Jersey. The event should be
mostly rain in Sussex County, Delaware and in Cape May County,
New Jersey.

The precipitation is anticipated to end quickly late on
Saturday night. A mid level short wave trough that was located
over British Columbia this afternoon will race to the east and
it should pass over our region at that time, kicking the last of
the snow and rain out to sea.

A light and variable wind on Saturday morning should settle
into the southeast on Saturday afternoon. The wind is forecast
to become variable again on Saturday evening before shifting to
the northwest around 5 to 10 MPH late on Saturday night. Low
temperatures on Saturday night are anticipated to be in the 20s
and lower 30s.

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
High pressure will build across the region Sunday, then build
offshore Sunday night. There could be some lingering clouds
during the day and winds could gust around 15 to 20 mph early in
the day. But otherwise, dry and tranquil conditions are
expected Sunday through Sunday night.

On Monday, the high continues to move out to sea, while a warm
front is forecast to lift into the area. As this happens, a
couple of short wave/vorticity impulses are expected to move
across the area as well Monday and Monday night, which could
help produce some light precipitation. Temperatures are expected
to be above freezing, except at the beginning of Monday
morning, so precipitation should be all rain unless it begins
early enough Monday. Some patchy fog may develop as well
overnight Monday, especially for portions of eastern
Pennsylvania and northern/central New Jersey.

The warm front is expected to have lifted north of the area by
Tuesday morning. Tuesday into Tuesday night are expected to be
dry unless a few isolated showers develop if any short wave
vorticity impulses move across the area. Some patchy
fog may develop as well overnight Tuesday, especially for
potions of eastern Pennsylvania and northern/central New Jersey.

The main thing of note for Tuesday will be the warm
temperatures. Temperatures about 20-25+ degrees above normal are
expected as a warm southwest, return flow is expected. Many
places could exceed record highs, especially if temperatures are
a couple of degrees warmer than forecast.

Wednesday has the potential to be another record warm day as
well, depending on how fast the cold front comes through.
Another potential limiting factor for Tuesday and Wednesday
would be cloud cover across the area. If we do have more cloud
cover, this could limit warming. There is also a chance of
showers Wednesday into Wednesday night as the cold front moves
across the area.

Thursday through Friday the cold front pushes to our south
while high pressure builds to our north. Thursday should be
mostly dry except across the far south where there could be some
lingering lift/moisture behind the cold front that may combine
to bring some light rain to the area. Friday has the better
chance of rain as return flow develops as the high to our north
builds offshore, and a warm front may lift across the area at
the same time a couple of short waves/vorticity impulses do as
well.

&&

.AVIATION /06Z SATURDAY THROUGH WEDNESDAY/...
The following discussion is for KPHL, KPNE, KTTN, KABE, KRDG,
KILG, KMIV, KACY and surrounding areas.

Through Saturday...VFR through early/mid afternoon as clouds lower,
then MVFR/IFR conditions develop after about 20z from southwest to
northeast as snow and rain arrive. Snow is expected at the
terminals, except MIV and ACY where it will mix with rain before
changing to all rain. Winds becoming southeasterly less than 10
knots.

Saturday night...Widespread precipitation including some moderate to
heavy snow at times. IFR or lower conditions, especially with
heavier snowfall rates. Some rain may mix in up to the PHL metro.
Snowfall rates of up to 1-inch per hour possible and this is when
accumulations would be the most efficient. Snow/rain ends quickly
after 06z from southwest to northeast with conditions improving to
VFR by daybreak. High confidence regarding precipitation occurring,
but low confidence on a wintry mix into the I-95 terminals. Light
and variable winds overall, becoming west-northwest overnight less
than 10 knots.

OUTLOOK...
Sunday-Sunday night...VFR. Winds may gust around 15-20 knots
early. High confidence.

Monday...VFR early, lowering to MVFR or IFR during the day with
rain possible. Winds may gust around 15 to 20 knots. Moderate
confidence.

Monday night...MVFR/IFR conditions continue with rain possible
in the evening, and low clouds/fog possible overnight. Moderate
confidence.

Tuesday...MVFR/IFR conditions possible early with light rain,
and low clouds/fog. Conditions improving to VFR during the day.
Southwest winds may gust around 20-25 knots. Moderate
confidence.

Tuesday night...VFR early, then possibly lowering to MVFR/IFR
as low clouds/fog may develop overnight. Moderate confidence.

Wednesday...MVFR/IFR conditions possible early with low
clouds/fog. Conditions improving to VFR during the day.
Southwest winds may gust around 20-25 knots. Moderate
confidence.

&&

.MARINE...
The Small Craft Advisory for Delaware Bay has been cancelled as
winds continue to diminish.

High pressure is expected to follow for overnight and Saturday
morning. Low pressure is anticipated to pass off the coast near Cape
Hatteras on Saturday evening.

A gusty northwest to north wind is occuring in the wake of a cold
front. As a result, a Small Craft Advisory remains in effect until
4:00 AM Saturday for the Atlantic coastal waters. Conditions should
remain below the Small Craft Advisory criteria for Saturday and
Saturday night. The area of low pressure on Saturday night is
expected to remain well to the south and east of our coastal
waters.

OUTLOOK...
Sunday-Monday...Sub Small Craft Advisory conditions expected.

Monday night...Sub Small Craft Advisory conditions expected,
although winds may gust around 20 knots.

Tuesday-Wednesday...Winds may stay below advisory levels, but
seas may increase to near 5 feet.

&&

.CLIMATE...
Some record high temperatures could be challenged on Tuesday,
February 20th and Wednesday February 21st. These records are listed
below.

February 20:

Atlantic City...70 in 1930

Philadelphia....70 in 1939

Wilmington......71 in 1930

Allentown.......68 in 1930

Trenton.........70 in 1930

Georgetown......68 in 2002

Mount Pocono....59 in 1930

Reading.........72 in 1930

February 21:

Atlantic City...74 in 1930

Philadelphia....72 in 1930

Wilmington......70 in 1953

Allentown.......67 in 1953

Trenton.........70 in 1930

Georgetown......71 in 2014

Mount Pocono....60 in 1930

Reading.........71 in 1930

&&

.PHI WATCHES/WARNINGS/ADVISORIES...
PA...Winter Storm Watch from this afternoon through late tonight
     for PAZ054-055-060>062-101>106.
NJ...Winter Storm Watch from this afternoon through late tonight
     for NJZ001-007>010-012-013-015.
DE...None.
MD...None.
MARINE...Small Craft Advisory until 4 AM EST early this morning for
     ANZ450>455.

&&

Synopsis...Robertson
Near Term...Iovino/Johnson
Short Term...Iovino/Johnson
Long Term...Robertson
Aviation...Gorse/Robertson
Marine...Gorse/Iovino/Robertson
Climate...
Hazardous weather outlook, Feb 16, 4:06 PM EST, 11 hours 39 minutes before
Hazardous Weather Outlook
National Weather Service Mount Holly NJ
406 PM EST Fri Feb 16 2018

NJZ001-007>010-012-013-015-PAZ054-055-060>062-101>106-172115-
Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Western Monmouth-
Mercer-Carbon-Monroe-Berks-Lehigh-Northampton-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
Lower Bucks-
406 PM EST Fri Feb 16 2018

...WINTER STORM WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE
SATURDAY NIGHT...

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

.DAY ONE...This Afternoon and Tonight.

There is a low probability for widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Winter Storm Watch.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

DEZ001-MDZ008-012-NJZ014-016>022-026-027-PAZ070-071-172115-
New Castle-Cecil-Kent MD-Eastern Monmouth-Salem-Gloucester-Camden-
Northwestern Burlington-Ocean-Cumberland-Atlantic-Coastal Ocean-
Southeastern Burlington-Delaware-Philadelphia-
406 PM EST Fri Feb 16 2018

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

.DAY ONE...This Afternoon and Tonight.

There is a low probability for widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

A period of snow is expected across the area Saturday night which
could lead to a couple inches of snow accumulation. There could also
be a mix of rain and, or sleet for a time as well which may limit
snow accumulations for some areas.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

DEZ002>004-MDZ015-019-020-NJZ023>025-172115-
Kent-Inland Sussex-Delaware Beaches-Queen Annes-Talbot-Caroline-
Cape May-Atlantic Coastal Cape May-Coastal Atlantic-
406 PM EST Fri Feb 16 2018

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

.DAY ONE...This Afternoon and Tonight.

There is a low probability for widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

A period of light snow is possible later Saturday afternoon and
evening before mixing with and changing to all rain. A slushy coating
of snow is possible for some areas.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ430-431-450>455-172115-
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-
406 PM EST Fri Feb 16 2018

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

.DAY ONE...This Afternoon and Tonight.

There is a low probability for widespread hazardous weather.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

There is a low probability for widespread hazardous weather.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 17, 3:58 PM ESTSmall Craft AdvisoryPHI21 hr

Nearby

Winter Weather Advisories in New Jersey, 2018Winter Weather Advisories in Pennsylvania, 2018Winter Weather Advisories in Delaware, 2018Every winter weather advisory in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.