Alert archive / Pennsylvania / Winter Weather Advisories in 2021
Winter Weather Advisory 1, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this winter weather advisory at Jan 2, 2021, 2:55 PM EST for 8 counties in Pennsylvania; 5 counties in New Jersey. It took effect at Jan 3, 2021, 5:00 AM EST. It was in force for 23 hr.
The area
The counties it named.
The facts
- Issued
- Jan 2, 2021, 2:55 PM EST (19:55 UTC)
- In effect from
- Jan 3, 2021, 5:00 AM EST
- Expired
- Jan 4, 2021, 4:01 AM EST
- In force
- 23 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, Chester County, PA, Lehigh County, PA, Monroe County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 103 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, 7.9 hours before the alert went out and 200 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 434 m above ground
- 0-6 km bulk shear
- 97 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 187 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
240 WWUS41 KPHI 021955 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 255 PM EST Sat Jan 2 2021 NJZ001-PAZ054-055-030900- /O.NEW.KPHI.WW.Y.0001.210103T1400Z-210104T0600Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 255 PM EST Sat Jan 2 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM SUNDAY TO 1 AM EST MONDAY... * WHAT...Mixed precipitation expected. Total snow accumulations of 1 to 3 inches and ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and Monroe. * WHEN...From 9 AM Sunday to 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. 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. && $$ NJZ007>010-PAZ060>062-101-103-105-030900- /O.NEW.KPHI.WW.Y.0001.210103T1400Z-210104T0600Z/ Warren-Morris-Hunterdon-Somerset-Berks-Lehigh-Northampton- Western Chester-Western Montgomery-Upper Bucks- Including the cities of Washington, Morristown, Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, Collegeville, Pottstown, Chalfont, and Perkasie 255 PM EST Sat Jan 2 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 9 AM SUNDAY TO 1 AM EST MONDAY... * WHAT...Mixed precipitation expected. Total snow accumulations of up to one inch and ice accumulations of a light glaze. * WHERE...Portions of northern and northwest New Jersey and east central and southeast Pennsylvania. * WHEN...From 9 AM Sunday to 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Precipitation may start as a mixture of freezing rain and sleet before transitioning to mostly plain rain into the afternoon. A brief transition to snow is possible Sunday night before the system exits the region. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Davis
6 follow-up statements
877 WWUS41 KPHI 030846 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 346 AM EST Sun Jan 3 2021 NJZ001-PAZ054-055-040000- /O.EXT.KPHI.WW.Y.0001.210103T1200Z-210104T0600Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 346 AM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 7 AM THIS MORNING TO 1 AM EST MONDAY... * WHAT...Mixed precipitation expected. Total snow accumulations of 1 to 3 inches and ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and Monroe. * WHEN...From 7 AM this morning to 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Precipitation will start out briefly as snow this morning, before quickly transitioning to a mixture of freezing rain, sleet, and snow. A transition then back over to snow will occur 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. && $$ NJZ008-040000- /O.EXT.KPHI.WW.Y.0001.210103T1200Z-210104T0600Z/ Morris- Including the city of Morristown 346 AM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 7 AM THIS MORNING TO 1 AM EST MONDAY... * WHAT...Mixed precipitation expected. Total snow accumulations of up to one inch and ice accumulations of a light glaze. * WHERE...Portions of northern and northwest New Jersey and east central and southeast Pennsylvania. * WHEN...From 7 AM this morning to 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Precipitation will start out as a mixture of freezing rain and sleet, before transitioning to plain rain by this afternoon. A brief transition to snow is possible tonight before the system exits the region. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ007-009-010-PAZ060>062-101-103-105-040000- /O.EXT.KPHI.WW.Y.0001.210103T1000Z-210104T0600Z/ Warren-Hunterdon-Somerset-Berks-Lehigh-Northampton- Western Chester-Western Montgomery-Upper Bucks- Including the cities of Washington, Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, Collegeville, Pottstown, Chalfont, and Perkasie 346 AM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Mixed precipitation expected. Total 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 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Precipitation will start out as a mixture of freezing rain and sleet, before transitioning to plain rain by this afternoon. A brief transition to snow is possible tonight before the system exits the region. 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. && $$ BAH
398 WWUS41 KPHI 031448 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 948 AM EST Sun Jan 3 2021 NJZ001-PAZ054-055-040400- /O.CON.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 948 AM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Mixed precipitation. Additional snow accumulations of 1 to 3 inches and ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and Monroe. * WHEN...Until 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. Add extra travel time. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ008-040400- /O.CON.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Morris- Including the city of Morristown 948 AM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Mixed precipitation. Additional snow accumulations of up to two inches and ice accumulations of a light glaze. * WHERE...Morris. * WHEN...Until 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. Allow extra travel time. 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. && $$ NJZ007-009-010-PAZ060>062-101-103-105-040400- /O.CON.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Warren-Hunterdon-Somerset-Berks-Lehigh-Northampton- Western Chester-Western Montgomery-Upper Bucks- Including the cities of Washington, Flemington, Somerville, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, Collegeville, Pottstown, Chalfont, and Perkasie 948 AM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Mixed precipitation. Additional snow accumulations of up to one inch and ice accumulations of up to one tenth of an inch. * WHERE...Portions of northern and northwest New Jersey and east central and southeast Pennsylvania. * WHEN...Until 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. Allow extra travel time. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Davis
568 WWUS41 KPHI 031826 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 126 PM EST Sun Jan 3 2021 NJZ009-010-PAZ060-101-103-105-031930- /O.CAN.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Hunterdon-Somerset-Berks-Western Chester-Western Montgomery- Upper Bucks- Including the cities of Flemington, Somerville, Reading, Honey Brook, Oxford, Collegeville, Pottstown, Chalfont, and Perkasie 126 PM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Temperatures have warmed above freezing behind this morning's round of winter weather. The second round of precipitation is expected to be mostly rain. $$ NJZ001-PAZ054-055-040600- /O.CON.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 126 PM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Mixed precipitation. Additional snow accumulations of 1 to 3 inches and ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and Monroe. * WHEN...Until 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ008-040600- /O.CON.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Morris- Including the city of Morristown 126 PM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Wet snow. Additional snow accumulations of up to two inches. A light glaze of freezing rain is also possible. * WHERE...Morris. * WHEN...Until 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. 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. && $$ NJZ007-PAZ061-062-040600- /O.CON.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Warren-Lehigh-Northampton- Including the cities of Washington, Allentown, Bethlehem, and Easton 126 PM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Wet snow. Additional snow accumulations of up to two inches. A light glaze of freezing rain is also possible. * WHERE...In Pennsylvania, Northampton and Lehigh. In New Jersey, Warren. * WHEN...Until 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Davis
993 WWUS41 KPHI 040252 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 952 PM EST Sun Jan 3 2021 NJZ001-PAZ054-055-040600- /O.CON.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 952 PM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Wet snow and freezing rain or freezing drizzle. Additional snow accumulations of 1 to 2 inches and ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and Monroe. * WHEN...Until 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. 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. && $$ NJZ008-040600- /O.CON.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Morris- Including the city of Morristown 952 PM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Wet snow and freezing rain or freezing drizzle. Additional snow accumulations of up to one inch. A light glaze of freezing rain is also possible. * WHERE...Morris. * WHEN...Until 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ007-PAZ061-062-040600- /O.CON.KPHI.WW.Y.0001.000000T0000Z-210104T0600Z/ Warren-Lehigh-Northampton- Including the cities of Washington, Allentown, Bethlehem, and Easton 952 PM EST Sun Jan 3 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 AM EST MONDAY... * WHAT...Wet snow and freezing rain or freezing drizzle. Additional snow accumulations of up to one inch. A light glaze of freezing rain is also possible. * WHERE...In Pennsylvania, Northampton and Lehigh. In New Jersey, Warren. * WHEN...Until 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. 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. && $$
048 WWUS41 KPHI 040519 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 1219 AM EST Mon Jan 4 2021 NJZ001-PAZ054-055-041100- /O.EXT.KPHI.WW.Y.0001.000000T0000Z-210104T1100Z/ Sussex-Carbon-Monroe- Including the cities of Newton, Jim Thorpe, and Stroudsburg 1219 AM EST Mon Jan 4 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 6 AM EST EARLY THIS MORNING... * WHAT...Wet snow and freezing rain or freezing drizzle. Additional snow accumulations of 1 to 2 inches and ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex. In Pennsylvania, Carbon and Monroe. * WHEN...Until 6 AM EST early this morning. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ008-041100- /O.EXT.KPHI.WW.Y.0001.000000T0000Z-210104T1100Z/ Morris- Including the city of Morristown 1219 AM EST Mon Jan 4 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 6 AM EST EARLY THIS MORNING... * WHAT...Wet snow and freezing rain or freezing drizzle. Additional snow accumulations of up to one inch. A light glaze of freezing rain is also possible. * WHERE...Morris. * WHEN...Until 6 AM EST early this morning. * IMPACTS...Plan on slippery road conditions. 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. && $$ NJZ007-PAZ061-062-041100- /O.EXT.KPHI.WW.Y.0001.000000T0000Z-210104T1100Z/ Warren-Lehigh-Northampton- Including the cities of Washington, Allentown, Bethlehem, and Easton 1219 AM EST Mon Jan 4 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 6 AM EST EARLY THIS MORNING... * WHAT...Wet snow and freezing rain or freezing drizzle. Additional snow accumulations of up to one inch. A light glaze of freezing rain is also possible. * WHERE...In Pennsylvania, Northampton and Lehigh. In New Jersey, Warren. * WHEN...Until 6 AM EST early this morning. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
884 WWUS41 KPHI 040901 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 401 AM EST Mon Jan 4 2021 NJZ001-007-008-PAZ054-055-061-062-041015- /O.CAN.KPHI.WW.Y.0001.000000T0000Z-210104T1100Z/ Sussex-Warren-Morris-Carbon-Monroe-Lehigh-Northampton- Including the cities of Newton, Washington, Morristown, Jim Thorpe, Stroudsburg, Allentown, Bethlehem, and Easton 401 AM EST Mon Jan 4 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Winter precipitation is coming to an end across the area this morning. Some drizzle and freezing drizzle may still persist slightly longer this morning, however this will be limited. Therefore, the 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.