Alert archive / Pennsylvania / Winter Storm Watches in 2018
Winter Storm Watch 3, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this winter storm watch at Feb 16, 2018, 3:51 AM EST for 8 counties in Pennsylvania; 8 counties in New Jersey. It took effect at Feb 17, 2018, 4:00 PM EST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 16, 2018, 3:51 AM EST (08:51 UTC)
- In effect from
- Feb 17, 2018, 4:00 PM EST
- Expired
- Feb 17, 2018, 3:45 AM EST
- In force
- Issued by
- NWS Philadelphia/Mount Holly
Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth 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), 90 km from the middle of the area, began a volume at 08:55 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, 8.9 hours before the alert went out and 189 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
- 1118 m above ground
- 0-6 km bulk shear
- 82 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
649 WWUS41 KPHI 160851 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 351 AM EST Fri Feb 16 2018 NJZ001-007-PAZ054-055-060>062-162100- /O.NEW.KPHI.WS.A.0003.180218T0000Z-180218T1000Z/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton- Including the cities of Newton, Washington, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, and Easton 351 AM EST Fri Feb 16 2018 ...WINTER STORM WATCH IN EFFECT FROM SATURDAY EVENING THROUGH LATE SATURDAY NIGHT... * WHAT...Heavy snow possible. Total snow accumulations of 4 to 6 inches are possible. * WHERE...The Lehigh Valley and Berks County, the southern Poconos and far northwestern New Jersey. * WHEN...From Saturday evening into very early Sunday morning. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Significant reductions in visibility are possible. There remains some uncertainty with how much precipitation extends this far westward, however there is the potential for a short period of heavy snow Saturday night which could lead to a rapid deterioration in road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow, sleet or ice accumulations that may impact travel. Continue to monitor the latest forecasts. && $$ NJZ008>010-012-015-PAZ101>106-162100- /O.NEW.KPHI.WS.A.0003.180218T0000Z-180218T1000Z/ Morris-Hunterdon-Somerset-Middlesex-Mercer-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Morristown, Flemington, Somerville, New Brunswick, Trenton, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 351 AM EST Fri Feb 16 2018 ...WINTER STORM WATCH IN EFFECT FROM SATURDAY EVENING THROUGH LATE SATURDAY NIGHT... * WHAT...Heavy snow possible. Total snow accumulations of 4 to 6 inches are possible. * WHERE...Most of southeastern Pennsylvania and northern New Jersey. * WHEN...From Saturday evening into very early Sunday morning. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Significant reductions in visibility are possible. There is the potential for a short period of heavy snow Saturday night which could lead to a rapid deterioration in road conditions. The snow could be wet enough especially closer to Interstate 95, potentially resulting in some power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow, sleet or ice accumulations that may impact travel. Continue to monitor the latest forecasts. && $$ For more information from the National Weather Service visit www.weather.gov/phi/winter
2 follow-up statements
981 WWUS41 KPHI 162059 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 359 PM EST Fri Feb 16 2018 NJZ013-170900- /O.EXB.KPHI.WS.A.0003.180217T2100Z-180218T0900Z/ Western Monmouth- Including the city of Freehold 359 PM EST Fri Feb 16 2018 ...WINTER STORM WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE SATURDAY NIGHT... * WHAT...Heavy snow possible. Total snow accumulations of 3 to 6 inches are possible. * WHERE...Western Monmouth county. * WHEN...From Saturday afternoon through late Saturday night. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Significant reductions in visibility are possible. There is the potential for a short period of heavy snow Saturday night which could lead to a rapid deterioration in road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow, sleet or ice accumulations that may impact travel. Continue to monitor the latest forecasts. && $$ NJZ001-007-PAZ054-055-060>062-170900- /O.EXT.KPHI.WS.A.0003.180217T2100Z-180218T0900Z/ Sussex-Warren-Carbon-Monroe-Berks-Lehigh-Northampton- Including the cities of Newton, Washington, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, and Easton 359 PM EST Fri Feb 16 2018 ...WINTER STORM WATCH NOW IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE SATURDAY NIGHT... * WHAT...Heavy snow possible. Total snow accumulations of up to 5 inches are possible. * WHERE...The Lehigh Valley and Berks County, the southern Poconos and far northwestern New Jersey. * WHEN...From Saturday afternoon through late Saturday night. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Significant reductions in visibility are possible. There remains some uncertainty with how much precipitation extends this far westward, however there is the potential for a short period of heavy snow Saturday night which could lead to a rapid deterioration in road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow, sleet or ice accumulations that may impact travel. Continue to monitor the latest forecasts. && $$ NJZ008>010-012-015-PAZ101>106-170900- /O.EXT.KPHI.WS.A.0003.180217T2100Z-180218T0900Z/ Morris-Hunterdon-Somerset-Middlesex-Mercer-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Morristown, Flemington, Somerville, New Brunswick, Trenton, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 359 PM EST Fri Feb 16 2018 ...WINTER STORM WATCH NOW IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE SATURDAY NIGHT... * WHAT...Heavy snow possible. Total snow accumulations of 3 to 6 inches are possible. * WHERE...Most of southeastern Pennsylvania and northern New Jersey. * WHEN...From Saturday afternoon through late Saturday night. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Significant reductions in visibility are possible. There is the potential for a short period of heavy snow Saturday night which could lead to a rapid deterioration in road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow, sleet or ice accumulations that may impact travel. Continue to monitor the latest forecasts. && $$ For more information from the National Weather Service visit www.weather.gov/phi/winter
860 WWUS41 KPHI 170845 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 345 AM EST Sat Feb 17 2018 NJZ001-007>010-012-015-PAZ054-055-060>062-101>106-172100- /O.UPG.KPHI.WS.A.0003.180217T2100Z-180218T0900Z/ /O.NEW.KPHI.WW.Y.0008.180217T2100Z-180218T0900Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Middlesex-Mercer-Carbon- Monroe-Berks-Lehigh-Northampton-Western Chester-Eastern Chester- Western Montgomery-Eastern Montgomery-Upper Bucks-Lower Bucks- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, New Brunswick, Trenton, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, Easton, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 345 AM EST Sat Feb 17 2018 ...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO 4 AM EST SUNDAY... * WHAT...Snow expected. Total snow accumulations of 3 to 5 inches are expected. * WHERE...Most of eastern Pennsylvania and northern New Jersey. * WHEN...Snow quickly overspreads the area from the southwest between around mid afternoon, becoming moderate to potentially heavy at times this evening. The snow should quickly by 4 AM. * ADDITIONAL DETAILS...Plan on difficult travel conditions. Be prepared for reduced visibilities at times. The snow may fall at up to an inch per hour at times in parts of the region, which would result in rapid deteriorating road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ 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
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 16, 3:48 AM EST | Small Craft Advisory | PHI | 24 hr |
Nearby
Winter Storm Watches in Pennsylvania, 2018Winter Storm Watches in New Jersey, 2018Every winter storm watch 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.