Alert archive / New Jersey / Extreme Heat Warnings in 2025
Extreme Heat Warning 2, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this extreme heat warning at Jul 24, 2025, 2:37 AM EDT for 9 counties in New Jersey; 4 counties in Pennsylvania; New Castle County, Delaware. It took effect at Jul 25, 2025, 10:00 AM EDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 24, 2025, 2:37 AM EDT (06:37 UTC)
- In effect from
- Jul 25, 2025, 10:00 AM EDT
- Expired
- Jul 25, 2025, 6:33 PM EDT
- In force
- 9 hr
- Issued by
- NWS Philadelphia/Mount Holly
Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Salem County, NJ, Somerset County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 49 km from the middle of the area, began a volume at 06:40 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.
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 00:00Z, 6.6 hours before the alert went out and 232 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
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1052 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- -7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this extreme heat warning 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 extreme heat warning went out at Jul 24, 2:14 AM EDT, 23 minutes earlier.
Area forecast discussion, Jul 24, 2:14 AM EDT, 23 minutes before
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</html>Hazardous weather outlook, Jul 23, 1:58 PM EDT, 12 hours 39 minutes before
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</html>Nearby
Extreme Heat Warnings in New Jersey, 2025Extreme Heat Warnings in Pennsylvania, 2025Extreme Heat Warnings in Delaware, 2025Every extreme heat warning in 2025
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.