Alert archive / Pennsylvania / Winter Weather Advisories in 2021
Winter Weather Advisory 13, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this winter weather advisory at Dec 26, 2021, 2:55 PM EST for 5 counties in Pennsylvania; Morris County, Sussex County, Warren County, New Jersey. It took effect at Dec 27, 2021, 11:00 AM EST. It was in force for 20 hr.
The area
The counties it named.
The facts
- Issued
- Dec 26, 2021, 2:55 PM EST (19:55 UTC)
- In effect from
- Dec 27, 2021, 11:00 AM EST
- Expired
- Dec 28, 2021, 6:43 AM EST
- In force
- 20 hr
- Issued by
- NWS Philadelphia/Mount Holly
Counties Morris County, NJ, Sussex County, NJ, Warren County, NJ, Berks County, PA, Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 122 km from the middle of the area, began a volume at 19:55 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 12:00Z, 7.9 hours before the alert went out and 202 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
- 574 m above ground
- 0-6 km bulk shear
- 92 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
372 WWUS41 KPHI 261955 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 255 PM EST Sun Dec 26 2021 PAZ054-055-270900- /O.NEW.KPHI.WW.Y.0013.211227T1600Z-211228T0500Z/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 255 PM EST Sun Dec 26 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM MONDAY TO MIDNIGHT EST MONDAY NIGHT... * WHAT...Mixed precipitation expected. Total snow accumulations of up to one inch and ice accumulations of a light glaze. * WHERE...Carbon and Monroe. * WHEN...From 11 AM Monday to midnight EST Monday night. * IMPACTS...Plan on slippery conditions on roadways and sidewalks. The hazardous conditions could impact the 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. && $$ Davis
6 follow-up statements
994 WWUS41 KPHI 270848 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 348 AM EST Mon Dec 27 2021 NJZ001-007-PAZ060>062-272300- /O.EXA.KPHI.WW.Y.0013.211227T1600Z-211228T0500Z/ Sussex-Warren-Berks-Lehigh-Northampton- Including the cities of Newton, Washington, Reading, Allentown, Bethlehem, and Easton 348 AM EST Mon Dec 27 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 11 AM THIS MORNING TO MIDNIGHT EST TONIGHT... * WHAT...Mixed precipitation expected. Total snow accumulations of up to one inch and ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex and Warren. In Pennsylvania, Berks, Lehigh and Northampton. * WHEN...From 11 AM Monday to midnight EST Monday night. * IMPACTS...Plan on slippery conditions on roadways and sidewalks. The hazardous conditions could impact the evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ PAZ054-055-272300- /O.CON.KPHI.WW.Y.0013.211227T1600Z-211228T0500Z/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 348 AM EST Mon Dec 27 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO MIDNIGHT EST TONIGHT... * WHAT...Mixed precipitation expected. Total snow accumulations of up to one inch and ice accumulations of a light glaze. * WHERE...Carbon and Monroe. * WHEN...From 11 AM Monday to midnight EST Monday night. * IMPACTS...Plan on slippery conditions on roadways and sidewalks. The hazardous conditions could impact the 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. && $$
040 WWUS41 KPHI 271628 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 1128 AM EST Mon Dec 27 2021 PAZ054-055-280500- /O.CON.KPHI.WW.Y.0013.000000T0000Z-211228T0500Z/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 1128 AM EST Mon Dec 27 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EST TONIGHT... * WHAT...Mixed precipitation is expected. Total snow accumulations of up to one inch, and ice accumulations of a light glaze. * WHERE...Carbon County and Monroe County. * WHEN...Until midnight tonight. * IMPACTS...Plan on slippery conditions on roadways and sidewalks. The hazardous conditions could impact the evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for your state can be obtained by calling 5 1 1. && $$ NJZ001-007-PAZ060>062-280500- /O.CON.KPHI.WW.Y.0013.000000T0000Z-211228T0500Z/ Sussex-Warren-Berks-Lehigh-Northampton- Including the cities of Newton, Washington, Reading, Allentown, Bethlehem, and Easton 1128 AM EST Mon Dec 27 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EST TONIGHT... * WHAT...Mixed precipitation is expected. Total snow accumulations of up to one inch, and ice accumulations of a light glaze. * WHERE...The New Jersey counties of Sussex and Warren. The Pennsylvania counties of Berks, Lehigh and Northampton. * WHEN...Until midnight tonight. * IMPACTS...Plan on slippery conditions on roadways and sidewalks. The hazardous conditions could impact the evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for your state can be obtained by calling 5 1 1. && $$ Iovino
048 WWUS41 KPHI 272014 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 314 PM EST Mon Dec 27 2021 PAZ060-061-272115- /O.CAN.KPHI.WW.Y.0013.000000T0000Z-211228T0500Z/ Berks-Lehigh- Including the cities of Reading and Allentown 314 PM EST Mon Dec 27 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... While areas of light snow and sleet remain possible into this evening, the potential for freezing rain has ended for Berks County and Lehigh County. As a result, the Winter Weather Advisory has been cancelled for the two counties. $$ NJZ008-280500- /O.EXA.KPHI.WW.Y.0013.000000T0000Z-211228T0500Z/ Morris- Including the city of Morristown 314 PM EST Mon Dec 27 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL MIDNIGHT EST TONIGHT... * WHAT...Mixed precipitation is expected. Total snow and sleet accumulations of less than an inch, and ice accumulations of a light glaze. * WHERE...Morris County, New Jersey. * WHEN...Until midnight tonight. * IMPACTS...Plan on slippery conditions on roadways and sidewalks. * ADDITIONAL DETAILS...The potential for icing is confined mainly to the northwestern part of the county. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for your state can be obtained by calling 5 1 1. && $$ NJZ001-007-PAZ054-055-062-280500- /O.CON.KPHI.WW.Y.0013.000000T0000Z-211228T0500Z/ Sussex-Warren-Carbon-Monroe-Northampton- Including the cities of Newton, Washington, Jim Thorpe, Stroudsburg, Bethlehem, and Easton 314 PM EST Mon Dec 27 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EST TONIGHT... * WHAT...Mixed precipitation is expected. Total snow and sleet accumulations of less than an inch, and ice accumulations of a light glaze. * WHERE...The New Jersey counties of Sussex and Warren. The Pennsylvania counties of Carbon, Monroe and Northampton. * WHEN...Until midnight tonight. * IMPACTS...Plan on slippery conditions on roadways and sidewalks. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for your state can be obtained by calling 5 1 1. && $$ Iovino
552 WWUS41 KPHI 280256 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 956 PM EST Mon Dec 27 2021 NJZ001-007-PAZ054-055-062-280600- /O.EXT.KPHI.WW.Y.0013.000000T0000Z-211228T0600Z/ Sussex-Warren-Carbon-Monroe-Northampton- Including the cities of Newton, Washington, Jim Thorpe, Stroudsburg, Bethlehem, and Easton 956 PM EST Mon Dec 27 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 AM EST TUESDAY... * WHAT...Freezing rain. Additional ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex and Warren. In Pennsylvania, Carbon, Northampton and Monroe. * WHEN...Until 1 AM EST Tuesday. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. 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. && $$ NJZ008-280600- /O.EXT.KPHI.WW.Y.0013.000000T0000Z-211228T0600Z/ Morris- Including the city of Morristown 956 PM EST Mon Dec 27 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 AM EST TUESDAY... * WHAT...Freezing rain. Additional ice accumulations of a light glaze. * WHERE...Morris. * WHEN...Until 1 AM EST Tuesday. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. * ADDITIONAL DETAILS...The potential for icing is confined mainly to the northwestern part of the county. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ Davis
685 WWUS41 KPHI 280537 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 1237 AM EST Tue Dec 28 2021 NJZ001-007-PAZ054-055-062-281200- /O.EXT.KPHI.WW.Y.0013.000000T0000Z-211228T1200Z/ Sussex-Warren-Carbon-Monroe-Northampton- Including the cities of Newton, Washington, Jim Thorpe, Stroudsburg, Bethlehem, and Easton 1237 AM EST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 7 AM EST THIS MORNING... * WHAT...Freezing rain and drizzle. Additional ice accumulations of a light glaze. * WHERE...In New Jersey, Sussex and Warren. In Pennsylvania, Carbon, Northampton and Monroe. * WHEN...Until 7 AM EST this morning. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$ NJZ008-281200- /O.EXT.KPHI.WW.Y.0013.000000T0000Z-211228T1200Z/ Morris- Including the city of Morristown 1237 AM EST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 7 AM EST THIS MORNING... * WHAT...Freezing rain and drizzle. Additional ice accumulations of a light glaze. * WHERE...Morris. * WHEN...Until 7 AM EST this morning. * IMPACTS...Very slippery sidewalks, roads and bridges are possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. The latest road conditions for the state you are calling from can be obtained by calling 5 1 1. && $$
765 WWUS41 KPHI 281143 WSWPHI URGENT - WINTER WEATHER MESSAGE National Weather Service Mount Holly NJ 643 AM EST Tue Dec 28 2021 NJZ001-007-008-PAZ054-055-062-281245- /O.CAN.KPHI.WW.Y.0013.000000T0000Z-211228T1200Z/ Sussex-Warren-Morris-Carbon-Monroe-Northampton- Including the cities of Newton, Washington, Morristown, Jim Thorpe, Stroudsburg, Bethlehem, and Easton 643 AM EST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Improving conditions and warming temperatures are expected over the next few hours. There could still be some patchy ice in a few spots, so drive with caution early this morning. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 26, 9:16 AM EST | Small Craft Advisory | PHI | 10 hr |
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.