Alert archive / New Jersey / Winter Storm Watches in 2021
Winter Storm Watch 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this winter storm watch at Feb 16, 2021, 3:14 PM EST for 4 states. It took effect at Feb 18, 2021, 4:00 AM EST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 16, 2021, 3:14 PM EST (20:14 UTC)
- In effect from
- Feb 18, 2021, 4:00 AM EST
- Expired
- Feb 17, 2021, 3:43 PM EST
- In force
- Issued by
- NWS Philadelphia/Mount Holly
All 24 counties
New Castle County, DE, Kent 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), 73 km from the middle of the area, began a volume at 20:14 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, 8.2 hours before the alert went out and 203 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
- 419 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 747 m²/s²
- 0-3 km storm-relative helicity
- 855 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
922 WWUS41 KPHI 162014 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 314 PM EST Tue Feb 16 2021 NJZ001-007>010-PAZ054-055-060>062-101-103-105-170930- /O.NEW.KPHI.WS.A.0004.210218T0900Z-210219T1800Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Berks- Lehigh-Northampton-Western Chester-Western Montgomery-Upper Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, Collegeville, Pottstown, Chalfont, and Perkasie 314 PM EST Tue Feb 16 2021 ...WINTER STORM WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH FRIDAY AFTERNOON... * WHAT...Heavy mixed precipitation possible. Total snow and sleet accumulations of 5 to 8 inches. * WHERE...Portions of northern and northwest New Jersey and east central, northeast and southeast Pennsylvania. * WHEN...From late Wednesday night through Friday afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Precipitation will begin as snow Thursday morning, with the heaviest snowfall expected Thursday morning into early Thursday afternoon. Sleet and/or freezing rain may then mix in Thursday evening into Thursday night. Light wintry precipitation will likely continue into the daytime hours on Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ DEZ001-MDZ012-NJZ012-013-015>019-PAZ070-071-102-104-106-170930- /O.NEW.KPHI.WS.A.0004.210218T0900Z-210219T1800Z/ New Castle-Kent MD-Middlesex-Western Monmouth-Mercer-Salem- Gloucester-Camden-Northwestern Burlington-Delaware-Philadelphia- Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Wilmington, Chestertown, New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, West Chester, Kennett Square, Norristown, Lansdale, Morrisville, and Doylestown 314 PM EST Tue Feb 16 2021 ...WINTER STORM WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH FRIDAY AFTERNOON... * WHAT...Heavy mixed precipitation possible. Total snow and sleet accumulations of 3 to 6 inches and ice accumulations of one tenth to one quarter of an inch possible. * WHERE...Portions of central, northern and southern New Jersey, southeast Pennsylvania, northeast Maryland and northern Delaware. * WHEN...From late Wednesday night through Friday afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Precipitation will begin as snow Thursday morning, with the heaviest snowfall expected Thursday morning into early Thursday afternoon. Sleet and/or freezing rain will then mix in Thursday evening into Thursday night. Light wintry precipitation may continue into the daytime hours on Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
2 follow-up statements
384 WWUS41 KPHI 170841 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 341 AM EST Wed Feb 17 2021 NJZ001-007>010-PAZ054-055-060>062-101-103-105-172200- /O.CON.KPHI.WS.A.0004.210218T0900Z-210219T1800Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Carbon-Monroe-Berks- Lehigh-Northampton-Western Chester-Western Montgomery-Upper Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, Collegeville, Pottstown, Chalfont, and Perkasie 341 AM EST Wed Feb 17 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY AFTERNOON... * WHAT...Heavy snow possible. Total snow accumulations of 5 to 8 inches possible. * WHERE...Portions of northern and northwest New Jersey and east central, northeast and southeast Pennsylvania. * WHEN...From late tonight through Friday afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Snow overspreads the area early Thursday morning and continues through the day and also Thursday night at varying intensity. The heaviest snow is expected Thursday morning through early Thursday afternoon. Some sleet may mix in Thursday evening, mainly closer to the I-95 corridor. Light wintry precipitation will likely continue into the daytime hours on Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ DEZ001-MDZ012-NJZ012-013-015>019-PAZ070-071-102-104-106-172200- /O.CON.KPHI.WS.A.0004.210218T0900Z-210219T1800Z/ New Castle-Kent MD-Middlesex-Western Monmouth-Mercer-Salem- Gloucester-Camden-Northwestern Burlington-Delaware-Philadelphia- Eastern Chester-Eastern Montgomery-Lower Bucks- Including the cities of Wilmington, Chestertown, New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, West Chester, Kennett Square, Norristown, Lansdale, Morrisville, and Doylestown 341 AM EST Wed Feb 17 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH FRIDAY AFTERNOON... * WHAT...Heavy mixed precipitation possible. Total snow and sleet accumulations of 4 to 6 inches and ice accumulations of up to one tenth of an inch possible. * WHERE...Portions of central, northern and southern New Jersey, southeast Pennsylvania, northeast Maryland and northern Delaware. * WHEN...From late tonight through Friday afternoon. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Snow overspreads much of the area early Thursday morning, then continues through the day Thursday. The heaviest snow is expected Thursday morning through early Thursday afternoon. Sleet and/or freezing rain will mix in toward later Thursday afternoon and Thursday night especially near and south and east of I-95. Light wintry precipitation should continue into the daytime hours on Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ Gorse
999 WWUS41 KPHI 172043 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 343 PM EST Wed Feb 17 2021 NJZ001-007-008-PAZ054-055-060>062-180945- /O.UPG.KPHI.WS.A.0004.210218T0900Z-210219T1800Z/ /O.NEW.KPHI.WS.W.0003.210218T0900Z-210219T1500Z/ Sussex-Warren-Morris-Carbon-Monroe-Berks-Lehigh-Northampton- Including the cities of Newton, Washington, Morristown, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, and Easton 343 PM EST Wed Feb 17 2021 ...WINTER STORM WARNING IN EFFECT FROM 4 AM THURSDAY TO 10 AM EST FRIDAY... * WHAT...Heavy snow expected. Total snow accumulations of 5 to 8 inches. * WHERE...Portions of northern New Jersey and east central and northeast Pennsylvania. * WHEN...From 4 AM Thursday to 10 AM EST Friday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning, Thursday evening, and Friday morning commutes. * ADDITIONAL DETAILS...Snow overspreads the area early Thursday morning and continues at varying intensity through the day and night, heaviest from late morning through the afternoon. Some sleet may mix in Thursday evening and overnight. Light snow will likely continue into the daytime hours on Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$ DEZ001-NJZ009-010-012-013-015>019-PAZ070-071-101>106-180945- /O.UPG.KPHI.WS.A.0004.210218T0900Z-210219T1800Z/ /O.NEW.KPHI.WS.W.0003.210218T0900Z-210219T1500Z/ New Castle-Hunterdon-Somerset-Middlesex-Western Monmouth-Mercer- Salem-Gloucester-Camden-Northwestern Burlington-Delaware- Philadelphia-Western Chester-Eastern Chester-Western Montgomery- Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Wilmington, Flemington, Somerville, New Brunswick, Freehold, Trenton, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 343 PM EST Wed Feb 17 2021 ...WINTER STORM WARNING IN EFFECT FROM 4 AM THURSDAY TO 10 AM EST FRIDAY... * WHAT...Heavy mixed precipitation expected. Total snow accumulations of 4 to 6 inches and ice accumulations of a light glaze. * WHERE...Portions of central, northern, northwest and southern New Jersey, southeast Pennsylvania and northern Delaware. * WHEN...From 4 AM Thursday to 10 AM EST Friday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the Thursday morning, Thursday evening, and Friday morning commutes. * ADDITIONAL DETAILS...Snow overspreads the area early Thursday morning and could be heavy at times in the morning and early afternoon. A change to sleet and freezing rain is expected by late afternoon or evening. Light wintry precipitation will likely continue into the daytime hours on Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ MDZ012-180945- /O.UPG.KPHI.WS.A.0004.210218T0900Z-210219T1800Z/ /O.NEW.KPHI.WW.Y.0009.210218T0900Z-210219T1500Z/ Kent MD- Including the city of Chestertown 343 PM EST Wed Feb 17 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM THURSDAY TO 10 AM EST FRIDAY... * WHAT...Mixed precipitation expected. Total snow accumulations of 2 to 4 inches and ice accumulations of up to one tenth of an inch. * WHERE...Kent MD. * WHEN...From 4 AM Thursday to 10 AM EST Friday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Thursday morning, Thursday evening, and Friday morning commutes. * ADDITIONAL DETAILS...Snow overspreads the area early Thursday morning and could be heavy at times in the morning. A change to sleet and freezing rain is expected by afternoon. Light wintry precipitation will likely continue into the daytime hours on Friday. 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. && $$ DEZ002-MDZ015-019-020-NJZ014-020>022-025>027-180945- /O.NEW.KPHI.WW.Y.0009.210218T0900Z-210219T1500Z/ Kent-Queen Annes-Talbot-Caroline-Eastern Monmouth-Ocean- Cumberland-Atlantic-Coastal Atlantic-Coastal Ocean- Southeastern Burlington- Including the cities of Dover, Centreville, Easton, Denton, Sandy Hook, Jackson, Millville, Hammonton, Atlantic City, Long Beach Island, and Wharton State Forest 343 PM EST Wed Feb 17 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM THURSDAY TO 10 AM EST FRIDAY... * WHAT...Mixed precipitation expected. Total snow accumulations of 1 to 3 inches and ice accumulations of up to one tenth of an inch. * WHERE...Portions of central and southern New Jersey, northeast Maryland and central Delaware. * WHEN...From 4 AM Thursday to 10 AM EST Friday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Thursday morning, Thursday evening, and Friday morning commutes. * ADDITIONAL DETAILS...Snow overspreads the area early Thursday morning and could be heavy at times in the morning. A change to sleet and freezing rain is expected by afternoon. Light wintry precipitation will likely continue into the daytime hours on Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ DEZ003-NJZ023-180945- /O.NEW.KPHI.WW.Y.0009.210218T0900Z-210219T1500Z/ Inland Sussex-Cape May- Including the cities of Georgetown and Cape May Court House 343 PM EST Wed Feb 17 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 4 AM THURSDAY TO 10 AM EST FRIDAY... * WHAT...Mixed precipitation expected. Total snow accumulations of up to one inch and ice accumulations of a light glaze. * WHERE...In New Jersey, Cape May. In Delaware, Inland Sussex. * WHEN...From 4 AM Thursday to 10 AM EST Friday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Thursday morning, Thursday evening, and Friday morning commutes. * ADDITIONAL DETAILS...Snow or mixed precipitation overspreads the area early Thursday morning. A change from snow to sleet, or from sleet and freeing rain to plain rain, is expected through the day on Thursday. Light mixed precipitation will likely continue into the daytime hours on Friday. 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/PO/JEO
Nearby
Winter Storm Watches in New Jersey, 2021Winter Storm Watches in Pennsylvania, 2021Winter Storm Watches in Delaware, 2021Every winter storm watch 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.