Alert archive / Pennsylvania / Winter Weather Advisories in 2021

Winter Weather Advisory 5, NWS Philadelphia/Mount Holly

February 8, 20216 counties in Pennsylvania; 5 counties in New Jersey

NWS Philadelphia/Mount Holly issued this winter weather advisory at Feb 8, 2021, 3:00 PM EST for 6 counties in Pennsylvania; 5 counties in New Jersey. It took effect at Feb 9, 2021, 1:00 AM EST. It was in force for 14 hr.

The area

The counties it named.

The facts

Issued
Feb 8, 2021, 3:00 PM EST (20:00 UTC)
In effect from
Feb 9, 2021, 1:00 AM EST
Expired
Feb 9, 2021, 2:53 PM EST
In force
14 hr
Issued by
NWS Philadelphia/Mount Holly

Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Bucks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 108 km from the middle of the area, began a volume at 19:59 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 12:00Z, 8.0 hours before the alert went out and 194 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 12:00Z on 2021-02-08Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2021-02-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -190 square meters per square second.1939587897117136156Sfc1 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
1127 m above ground
0-6 km bulk shear
83 kt
0-1 km storm-relative helicity
-190 m²/s²
0-3 km storm-relative helicity
-38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

460 
WWUS41 KPHI 082000
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
300 PM EST Mon Feb 8 2021

NJZ001-PAZ054-055-091000-
/O.NEW.KPHI.WW.Y.0005.210209T0600Z-210209T2200Z/
Sussex-Carbon-Monroe-
Including the cities of Newton, Jim Thorpe, and Stroudsburg
300 PM EST Mon Feb 8 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 AM TO 5 PM EST
TUESDAY...

* WHAT...Snow expected. Total snow accumulations of 3 to 4 
  inches.

* WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and 
  Monroe.

* WHEN...From 1 AM to 5 PM EST Tuesday.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the morning or evening commute.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$
4 follow-up statements
317 
WWUS41 KPHI 090027
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
727 PM EST Mon Feb 8 2021

NJZ007-008-PAZ061-062-091100-
/O.EXB.KPHI.WW.Y.0005.210209T0900Z-210209T2200Z/
Warren-Morris-Lehigh-Northampton-
Including the cities of Washington, Morristown, Allentown, 
Bethlehem, and Easton
727 PM EST Mon Feb 8 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM TO 5 PM EST
TUESDAY...

* WHAT...Snow expected. Total snow accumulations of 2 to 4 
  inches.

* WHERE...In New Jersey, Warren and Morris. In Pennsylvania, 
  Lehigh and Northampton.

* WHEN...From 4 AM to 5 PM EST Tuesday.

* IMPACTS...Plan on slippery road conditions. The hazardous
  conditions will impact the morning commute.

* ADDITIONAL DETAILS...Snow develops from west to east between
  about 4 AM and 6 AM Tuesday and continues through the morning, 
  then tapers off during Tuesday afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

NJZ001-PAZ054-055-091100-
/O.CON.KPHI.WW.Y.0005.210209T0600Z-210209T2200Z/
Sussex-Carbon-Monroe-
Including the cities of Newton, Jim Thorpe, and Stroudsburg
727 PM EST Mon Feb 8 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 1 AM TO 5 PM
EST TUESDAY...

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

* WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and 
  Monroe.

* WHEN...From 1 AM to 5 PM EST Tuesday.

* IMPACTS...Plan on slippery road conditions. The hazardous
  conditions will impact the morning commute.

* ADDITIONAL DETAILS...Snow develops from west to east between
  about 2 AM and 4 AM Tuesday and continues through the morning, 
  then tapers off during the afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

Gorse
228 
WWUS41 KPHI 090751
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
251 AM EST Tue Feb 9 2021

NJZ009-010-PAZ060-105-092200-
/O.EXA.KPHI.WW.Y.0005.210209T0900Z-210209T2200Z/
Hunterdon-Somerset-Berks-Upper Bucks-
Including the cities of Flemington, Somerville, Reading, 
Chalfont, and Perkasie
251 AM EST Tue Feb 9 2021

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 PM EST THIS
AFTERNOON...

* WHAT...Mixed precipitation expected. Total snow accumulations 
  of up to two inches and ice accumulations of a light glaze.

* WHERE...In New Jersey, Hunterdon and Somerset Counties. In
  Pennsylvania, Berks County and upper portions of Bucks County.

* WHEN...Until 5 PM EST Tuesday.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions will impact the morning commute.

* ADDITIONAL DETAILS...Snow develops from west to east between
  about 4 AM and 7 AM today. Snow may begin to mix with sleet and
  freezing rain near or after the morning rush. With cold surface
  temperatures, slick roads may develop quickly. Precipitation
  should taper off during the afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

NJZ001-PAZ054-055-092200-
/O.CON.KPHI.WW.Y.0005.000000T0000Z-210209T2200Z/
Sussex-Carbon-Monroe-
Including the cities of Newton, Jim Thorpe, and Stroudsburg
251 AM EST Tue Feb 9 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM EST THIS
AFTERNOON...

* WHAT...Snow expected. Total snow accumulations of 3 to 5 inches.
  Locally higher amounts up to 7 inches are possible in the higher
  terrain.

* WHERE...In New Jersey, Sussex County. In Pennsylvania, Carbon 
  and Monroe Counties.

* WHEN...Until 5 PM EST Tuesday.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions will impact the morning commute.

* ADDITIONAL DETAILS...Snow should develop and spread eastward
  quickly through the morning rush and continue through midday
  before tapering off this afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

NJZ007-008-PAZ061-062-092200-
/O.CON.KPHI.WW.Y.0005.210209T0900Z-210209T2200Z/
Warren-Morris-Lehigh-Northampton-
Including the cities of Washington, Morristown, Allentown, 
Bethlehem, and Easton
251 AM EST Tue Feb 9 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM EST THIS
AFTERNOON...

* WHAT...Snow expected. Total snow accumulations of 2 to 4 
  inches.

* WHERE...In New Jersey, Warren and Morris Counties. In 
  Pennsylvania, Lehigh and Northampton Counties.

* WHEN...Until 5 PM EST Tuesday.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions will impact the morning commute.

* ADDITIONAL DETAILS...Snow should develop and spread eastward
  quickly through the morning rush and continue through midday
  before tapering off this afternoon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

CMS
105 
WWUS41 KPHI 091502
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
1002 AM EST Tue Feb 9 2021



NJZ001-PAZ054-055-092200-
/O.CON.KPHI.WW.Y.0005.000000T0000Z-210209T2200Z/
Sussex-Carbon-Monroe-
Including the cities of Newton, Jim Thorpe, and Stroudsburg
1002 AM EST Tue Feb 9 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM EST THIS
AFTERNOON...

* WHAT...Snow. Additional snow accumulations of up to two inches.

* WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and 
  Monroe.

* WHEN...Until 5 PM EST this afternoon.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the evening commute.

* ADDITIONAL DETAILS...Periods of snow will continue through
  midday before tapering off from west to east this afternoon. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

NJZ007>010-PAZ060>062-105-092200-
/O.CON.KPHI.WW.Y.0005.000000T0000Z-210209T2200Z/
Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton-
Upper Bucks-
Including the cities of Washington, Morristown, Flemington, 
Somerville, Reading, Allentown, Bethlehem, Easton, Chalfont, 
and Perkasie
1002 AM EST Tue Feb 9 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 PM EST THIS
AFTERNOON...

* WHAT...Mixed precipitation. Additional snow accumulations of 
  up to one inch and ice accumulations of a light glaze.

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

* WHEN...Until 5 PM EST this afternoon.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the evening commute.

* ADDITIONAL DETAILS...Periods of light snow mixed at times with 
  sleet, light freezing rain, or freezing drizzle will continue 
  through midday before tapering off from west to east this 
  afternoon. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

The latest road conditions for the state you are calling from can
be obtained by calling 5 1 1.

&&

$$

Fitzsimmons
639 
WWUS41 KPHI 091953
WSWPHI

URGENT - WINTER WEATHER MESSAGE
National Weather Service Mount Holly NJ
253 PM EST Tue Feb 9 2021



NJZ001-007>010-PAZ054-055-060>062-105-092100-
/O.CAN.KPHI.WW.Y.0005.000000T0000Z-210209T2200Z/
Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Berks-
Lehigh-Northampton-Upper Bucks-
Including the cities of Newton, Washington, Morristown, 
Flemington, Somerville, Jim Thorpe, Stroudsburg, Reading, 
Allentown, Bethlehem, Easton, Chalfont, and Perkasie
253 PM EST Tue Feb 9 2021

...WINTER WEATHER ADVISORY IS CANCELLED...

Snow has moved out of the region and therefore the Winter Weather
Advisory has been cancelled. 

$$

Nearby

Winter Weather Advisories in Pennsylvania, 2021Winter Weather Advisories in New Jersey, 2021Every winter weather advisory in 2021

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.