Alert archive / Pennsylvania / Winter Storm Warnings in 2018
Winter Storm Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this winter storm warning at Feb 17, 2018, 7:41 PM EST for 7 counties in Pennsylvania; 5 counties in New Jersey. It was in force for 4 hr. 34 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Feb 17, 2018, 7:41 PM EST (00:41 UTC)
- Expired
- Feb 18, 2018, 12:05 AM EST
- In force
- 4 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, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 105 km from the middle of the area, began a volume at 00:40 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 17, 7:58 PM EST | SNOW 6 | Spring Twp, PA | |
| Feb 17, 7:58 PM EST | SNOW 6.3 | Danielsville, PA | |
| Feb 17, 8:03 PM EST | SNOW 5.4 | Butler, NJ | |
| Feb 17, 8:04 PM EST | SNOW 6.2 | Stewartsville, NJ | |
| Feb 17, 8:07 PM EST | SNOW 6.3 | Bushkill Twp, PA | |
| Feb 17, 8:08 PM EST | SNOW 3 | Perkasie, PA | |
| Feb 17, 8:09 PM EST | SNOW 1.3 | Trevose, PA | |
| Feb 17, 8:09 PM EST | SNOW 5.5 | Green Lane, PA | |
| Feb 17, 8:09 PM EST | SNOW 6.8 | Laurys Station, PA | |
| Feb 17, 8:11 PM EST | SNOW 4 | Newton, NJ | |
| Feb 17, 8:11 PM EST | SNOW 6 | New Tripoli, PA | |
| Feb 17, 8:12 PM EST | SNOW 6.3 | Allentown, PA | |
| Feb 17, 8:13 PM EST | SNOW 7.1 | S Allentown, PA | |
| Feb 17, 8:14 PM EST | SNOW 5.7 | Hellertown, PA | |
| Feb 17, 8:43 PM EST | SNOW 6 | Douglassville, PA | |
| Feb 17, 8:44 PM EST | SNOW 3 | Pottstown, PA | |
| Feb 17, 8:44 PM EST | SNOW 8 | Roxbury Twp, NJ | |
| Feb 17, 8:47 PM EST | SNOW 4 | Graterford, PA | |
| Feb 17, 8:48 PM EST | SNOW 5.9 | Upper Nazareth Twp, PA | |
| Feb 17, 8:49 PM EST | SNOW 3.9 | Readington Twp, NJ | |
| Feb 17, 8:53 PM EST | SNOW 6.8 | 1 Ese Franklin, NJ | |
| Feb 17, 8:54 PM EST | SNOW 7.2 | Martins Creek, PA | |
| Feb 17, 8:55 PM EST | SNOW 7 | Rockaway, NJ | |
| Feb 17, 8:56 PM EST | SNOW 5.5 | Newton, NJ | |
| Feb 17, 8:57 PM EST | SNOW 5.5 | Columbia, NJ | |
| Feb 17, 8:57 PM EST | SNOW 7 | Hamburg, PA | |
| Feb 17, 8:59 PM EST | SNOW 2.7 | 3 N Wantage, NJ | |
| Feb 17, 9:03 PM EST | SNOW 6.5 | Hamburg, PA | |
| Feb 17, 9:03 PM EST | SNOW 7.5 | Walnutport, PA | |
| Feb 17, 9:04 PM EST | SNOW 6.3 | Emmaus, PA | |
| Feb 17, 9:05 PM EST | SNOW 6 | Hellertown, PA | |
| Feb 17, 9:07 PM EST | SNOW 7.2 | Stewartsville, NJ | |
| Feb 17, 9:07 PM EST | SNOW 7.4 | S Allentown, PA | |
| Feb 17, 9:08 PM EST | SNOW 6.6 | New Tripoli, PA |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 0.7 hours before the alert went out and 196 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
- 620 m above ground
- 0-6 km bulk shear
- 106 kt
- 0-1 km storm-relative helicity
- 334 m²/s²
- 0-3 km storm-relative helicity
- 517 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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. && $$ For more information from the National Weather Service visit www.weather.gov/phi/winter
2 follow-up statements
643 WWUS41 KPHI 180251 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 951 PM EST Sat Feb 17 2018 PAZ060-103-180400- /O.CAN.KPHI.WS.W.0004.000000T0000Z-180218T0900Z/ Berks-Western Montgomery- Including the cities of Reading, Collegeville, and Pottstown 951 PM EST Sat Feb 17 2018 ...WINTER STORM WARNING IS CANCELLED... Heavy snow has ended. Light snow or snow showers may continue for a few more hours. $$ 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
Nearby
Winter Storm Warnings in Pennsylvania, 2018Winter Storm Warnings in New Jersey, 2018Every winter storm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.