Alert archive / New Jersey / Dense Fog Advisories in 2020
Dense Fog Advisory 10, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this dense fog advisory at Jul 19, 2020, 11:25 AM EDT for 4 counties in New Jersey; Sussex County, Delaware. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Jul 19, 2020, 11:25 AM EDT (15:25 UTC)
- Expired
- Jul 20, 2020, 12:46 AM EDT
- In force
- 13 hr
- Issued by
- NWS Philadelphia/Mount Holly
Counties Sussex County, DE, Atlantic County, NJ, Cape May County, NJ, Monmouth County, NJ, Ocean County, NJ
The radar
The Philadelphia radar (KDIX), 56 km from the middle of the area, began a volume at 15:28 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
Wallops Is Stn, VA (KWAL), launched 12:00Z, 3.4 hours before the alert went out and 184 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
- 814 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1391 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this dense fog advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before this dense fog advisory went out at Jul 19, 11:07 AM EDT, 18 minutes earlier.
Area forecast discussion, Jul 19, 11:07 AM EDT, 18 minutes before
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</html>Hazardous weather outlook, Jul 19, 8:12 AM EDT, 3 hours 13 minutes before
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Special weather statement, Jul 19, 7:53 AM EDT, 3 hours 32 minutes before
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</html>Special weather statement, Jul 19, 10:01 AM EDT, 1 hour 24 minutes before
Special Weather Statement National Weather Service Mount Holly NJ 1001 AM EDT Sun Jul 19 2020 DEZ004-NJZ024-025-191700- Delaware Beaches-Atlantic Coastal Cape May-Coastal Atlantic- Including the cities of Rehoboth Beach, Ocean City, and Atlantic City 1001 AM EDT Sun Jul 19 2020 ...Areas of Dense Fog This Morning... Areas of dense fog remain across coastal areas southern New Jersey and Delaware. Visibility will lower to less than one half mile at times. The fog is expected to dissipate within the next couple of hours. Please use caution if driving this morning. Allow extra time to reach your destination and if you encounter fog, reduce speed and increase following distance with the vehicle in front of you. Robertson
Special weather statement, Jul 19, 10:27 AM EDT, 58 minutes before
Special Weather Statement National Weather Service Mount Holly NJ 1027 AM EDT Sun Jul 19 2020 DEZ004-NJZ024>026-191700- Delaware Beaches-Atlantic Coastal Cape May-Coastal Atlantic- Coastal Ocean- Including the cities of Rehoboth Beach, Ocean City, Atlantic City, and Long Beach Island 1027 AM EDT Sun Jul 19 2020 ...Areas of Dense Fog This Morning... Areas of dense fog remain across southern New Jersey, Delaware, and Maryland. Visibility will lower to less than one half mile at times. The fog is expected to dissipate within the next hour or two. Please use caution if driving this morning. Allow extra time to reach your destination and if you encounter fog, reduce speed and increase following distance with the vehicle in front of you. Robertson
Special weather statement, Jul 19, 10:28 AM EDT, 57 minutes before
Special Weather Statement National Weather Service Mount Holly NJ 1028 AM EDT Sun Jul 19 2020 DEZ004-NJZ024>026-191700- Delaware Beaches-Atlantic Coastal Cape May-Coastal Atlantic- Coastal Ocean- Including the cities of Rehoboth Beach, Ocean City, Atlantic City, and Long Beach Island 1028 AM EDT Sun Jul 19 2020 Areas of dense fog remain across coastal areas southern New Jersey and Delaware. Visibility will lower to less than one half mile at times. The fog is expected to dissipate within the next couple of hours. Please use caution if driving this morning. Allow extra time to reach your destination and if you encounter fog, reduce speed and increase following distance with the vehicle in front of you. Roberts
Special weather statement, Jul 19, 10:31 AM EDT, 54 minutes before
Special Weather Statement National Weather Service Mount Holly NJ 1031 AM EDT Sun Jul 19 2020 DEZ004-NJZ024>026-191700- Delaware Beaches-Atlantic Coastal Cape May-Coastal Atlantic- Coastal Ocean- Including the cities of Rehoboth Beach, Ocean City, Atlantic City, and Long Beach Island 1031 AM EDT Sun Jul 19 2020 ...Areas of Dense Fog Through Early Afternoon... Areas of dense fog remain across coastal areas southern New Jersey and Delaware. Visibility will lower to less than one half mile at times. The fog is expected to dissipate within the next couple of hours. Please use caution if driving today. Allow extra time to reach your destination and if you encounter fog, reduce speed and increase following distance with the vehicle in front of you. Robertson
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 8:05 AM EDT | Marine Dense Fog Advisory | PHI | 20 hr | |
| Jul 19, 7:44 PM EDT | Special Weather Statement | PHI | Sussex | 31 min |
| Jul 19, 2:44 PM EDT | Special Weather Statement | PHI | Sussex | 46 min |
| Jul 19, 3:32 PM EDT | Special Weather Statement | PHI | Sussex | 28 min |
Nearby
Dense Fog Advisories in New Jersey, 2020Dense Fog Advisories in Delaware, 2020Every dense fog advisory in 2020
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.