Alert archive / New Jersey / Dense Fog Advisories in 2021
Dense Fog Advisory 8, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this dense fog advisory at Dec 30, 2021, 9:33 PM EST for 16 counties in New Jersey; Kent County, New Castle County, Sussex County, Delaware; 10 counties in Pennsylvania. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- Dec 30, 2021, 9:33 PM EST (02:33 UTC)
- Expired
- Dec 31, 2021, 9:00 AM EST
- In force
- 11 hr
- Issued by
- NWS Philadelphia/Mount Holly
All 29 counties
Kent County, DE, New Castle County, DE, Sussex County, DE, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Morris County, NJ, Ocean 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), 59 km from the middle of the area, began a volume at 02:33 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, 2.6 hours before the alert went out and 205 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
- 658 m above ground
- 0-6 km bulk shear
- 83 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 191 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
348 WWUS71 KPHI 310233 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 933 PM EST Thu Dec 30 2021 DEZ001>004-NJZ016>018-021>025-311400- /O.NEW.KPHI.FG.Y.0008.211231T0233Z-211231T1400Z/ New Castle-Kent-Inland Sussex-Delaware Beaches-Salem-Gloucester- Camden-Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May- Coastal Atlantic- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Pennsville, Glassboro, Camden, Cherry Hill, Millville, Hammonton, Cape May Court House, Ocean City, and Atlantic City 933 PM EST Thu Dec 30 2021 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EST FRIDAY... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Delaware and far South Jersey. * WHEN...Until 9 AM EST Friday. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ PAZ054-055-311400- /O.NEW.KPHI.FG.Y.0008.211231T0233Z-211231T1400Z/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 933 PM EST Thu Dec 30 2021 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EST FRIDAY... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Carbon and Monroe. * WHEN...Until 9 AM EST Friday. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ SFJ
5 follow-up statements
959 WWUS71 KPHI 310555 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 1255 AM EST Fri Dec 31 2021 PAZ070-101-102-311400- /O.EXA.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ Delaware-Western Chester-Eastern Chester- Including the cities of Media, Honey Brook, Oxford, West Chester, and Kennett Square 1255 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Delaware and Chester Counties in Pennsylvania. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ DEZ001>004-NJZ016>018-021>025-311400- /O.CON.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ New Castle-Kent-Inland Sussex-Delaware Beaches-Salem-Gloucester- Camden-Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May- Coastal Atlantic- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Pennsville, Glassboro, Camden, Cherry Hill, Millville, Hammonton, Cape May Court House, Ocean City, and Atlantic City 1255 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Southern New Jersey and Delaware. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ PAZ054-055-311400- /O.CON.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 1255 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Monroe and Carbon Counties in Pennsylvania. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ CMS
781 WWUS71 KPHI 310723 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 223 AM EST Fri Dec 31 2021 PAZ071-103>106-311400- /O.EXA.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ Philadelphia-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Philadelphia, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 223 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Bucks, Montgomery, and Philadelphia Counties in Pennsylvania. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ DEZ001>004-NJZ016>018-021>025-PAZ070-101-102-311400- /O.CON.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ New Castle-Kent-Inland Sussex-Delaware Beaches-Salem-Gloucester- Camden-Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May- Coastal Atlantic-Delaware-Western Chester-Eastern Chester- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Pennsville, Glassboro, Camden, Cherry Hill, Millville, Hammonton, Cape May Court House, Ocean City, Atlantic City, Media, Honey Brook, Oxford, West Chester, and Kennett Square 223 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Far southeast Pennsylvania, southern New Jersey, and Delaware. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ PAZ054-055-311400- /O.CON.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 223 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Carbon and Monroe Counties in Pennsylvania. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ CMS
205 WWUS71 KPHI 310930 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 430 AM EST Fri Dec 31 2021 NJZ001-007>010-015-PAZ060>062-311400- /O.EXA.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Mercer-Berks-Lehigh- Northampton- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, Trenton, Reading, Allentown, Bethlehem, and Easton 430 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...The Lehigh Valley in Pennsylvania and much of northern New Jersey. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ DEZ001>004-NJZ016>018-021>025-PAZ070-071-101>106-311400- /O.CON.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ New Castle-Kent-Inland Sussex-Delaware Beaches-Salem-Gloucester- Camden-Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May- Coastal Atlantic-Delaware-Philadelphia-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Pennsville, Glassboro, Camden, Cherry Hill, Millville, Hammonton, Cape May Court House, Ocean City, Atlantic City, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 430 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...The Philadelphia metropolitan area, southern New Jersey, and Delaware. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ PAZ054-055-311400- /O.CON.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ Carbon-Monroe- Including the cities of Jim Thorpe and Stroudsburg 430 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Carbon and Monroe Counties in Pennsylvania. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ CMS
730 WWUS71 KPHI 311120 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 620 AM EST Fri Dec 31 2021 NJZ012>014-019-020-026-027-311400- /O.EXA.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ Middlesex-Western Monmouth-Eastern Monmouth- Northwestern Burlington-Ocean-Coastal Ocean- Southeastern Burlington- Including the cities of New Brunswick, Freehold, Sandy Hook, Moorestown, Mount Holly, Jackson, Long Beach Island, and Wharton State Forest 620 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Middlesex, Monmouth, Burlington, and Ocean Counties in New Jersey. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ DEZ001>004-NJZ016>018-021>025-PAZ070-071-101>106-311400- /O.CON.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ New Castle-Kent-Inland Sussex-Delaware Beaches-Salem-Gloucester- Camden-Cumberland-Atlantic-Cape May-Atlantic Coastal Cape May- Coastal Atlantic-Delaware-Philadelphia-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, Pennsville, Glassboro, Camden, Cherry Hill, Millville, Hammonton, Cape May Court House, Ocean City, Atlantic City, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 620 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portions of southern New Jersey, southeast Pennsylvania, and Delaware. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ NJZ001-007>010-015-PAZ054-055-060>062-311400- /O.CON.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Mercer-Carbon-Monroe- Berks-Lehigh-Northampton- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, Trenton, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, and Easton 620 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY REMAINS IN EFFECT UNTIL 9 AM EST THIS MORNING... * WHAT...Visibility one quarter mile or less in dense fog. * WHERE...Portions of northern and central New Jersey and east central and northeast Pennsylvania. * WHEN...Until 9 AM EST this morning. * IMPACTS...Hazardous driving conditions due to low visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... If driving, slow down, use your headlights, and leave plenty of distance ahead of you. && $$ CMS
639 WWUS71 KPHI 311358 NPWPHI URGENT - WEATHER MESSAGE National Weather Service Mount Holly NJ 858 AM EST Fri Dec 31 2021 DEZ001>004-NJZ012>014-016>027-PAZ070-071-101>106-311500- /O.EXP.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ New Castle-Kent-Inland Sussex-Delaware Beaches-Middlesex- Western Monmouth-Eastern Monmouth-Salem-Gloucester-Camden- Northwestern Burlington-Ocean-Cumberland-Atlantic-Cape May- Atlantic Coastal Cape May-Coastal Atlantic-Coastal Ocean- Southeastern Burlington-Delaware-Philadelphia-Western Chester- Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks- Lower Bucks- Including the cities of Wilmington, Dover, Georgetown, Rehoboth Beach, New Brunswick, Freehold, Sandy Hook, Pennsville, Glassboro, Camden, Cherry Hill, Moorestown, Mount Holly, Jackson, Millville, Hammonton, Cape May Court House, Ocean City, Atlantic City, Long Beach Island, Wharton State Forest, Media, Philadelphia, Honey Brook, Oxford, West Chester, Kennett Square, Collegeville, Pottstown, Norristown, Lansdale, Chalfont, Perkasie, Morrisville, and Doylestown 858 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY WILL EXPIRE AT 9 AM EST THIS MORNING... Areas of fog remain across the region, but dense fog is becoming localized. $$ NJZ001-007>010-015-PAZ054-055-060>062-311500- /O.EXP.KPHI.FG.Y.0008.000000T0000Z-211231T1400Z/ Sussex-Warren-Morris-Hunterdon-Somerset-Mercer-Carbon-Monroe- Berks-Lehigh-Northampton- Including the cities of Newton, Washington, Morristown, Flemington, Somerville, Trenton, Jim Thorpe, Stroudsburg, Reading, Allentown, Bethlehem, and Easton 858 AM EST Fri Dec 31 2021 ...DENSE FOG ADVISORY WILL EXPIRE AT 9 AM EST THIS MORNING... Areas of fog remain across the region, but dense fog is becoming localized. $$ MPS
Nearby
Dense Fog Advisories in New Jersey, 2021Dense Fog Advisories in Pennsylvania, 2021Dense Fog Advisories in Delaware, 2021Every dense fog 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.