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Extreme Heat Watch Issued by NWS Mount Holly NJ

July 14, 2026 · wweather1 editorial · 1 min read

NWS Mount Holly NJ has issued an Extreme Heat Watch for parts of Delaware, New Jersey, and Pennsylvania. Dangerously hot conditions with heat index values up to 106 are possible from Wednesday morning through Wednesday evening on July 15, 2026.

An Extreme Heat Watch has been issued by NWS Mount Holly NJ. This watch is in effect from Wednesday morning, July 15, 2026, through Wednesday evening, July 15, 2026. The alert was originally issued on July 13 at 2:45 PM EDT and is set to expire on July 15 at 8:00 PM EDT.

The affected region includes New Castle County in Delaware. In New Jersey, Mercer, Camden, Gloucester, and Northwestern Burlington Counties are under the watch. Pennsylvania areas covered are Delaware, Eastern Montgomery, Lower Bucks, and Philadelphia Counties.

Conditions during this period may include dangerously high heat index values, possibly reaching up to 106. The National Weather Service emphasizes that extreme heat and high humidity events significantly increase the risk of heat-related illnesses.

Why it is dangerous and what to do

⚠️ Safety
• Drink plenty of fluids.
• Stay in air-conditioned areas and out of the sun.
• Check on relatives and neighbors.
• Avoid leaving young children and pets in unattended vehicles.
📊 The numbers, from wweather1 data
Philadelphia: now +34°, Clear.
That is 4° above the July climate norm.
The record for this date is +36° (1992).
Three-day forecast: 14 July: +34°/+20° · 15 July: +39°/+22° · 16 July: +36°/+23°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

🌍 Weather in nearby cities

📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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