Severe Thunderstorm Warning Issued for Philadelphia Area Until 6:15 PM EDT
This alert is no longer in effect.
NOAA issued it on August 20, 2026, 3 days ago. Warnings of this kind stay in effect for hours to a few days, so this page is a historical record of what was issued, not a current warning. For conditions where you are right now, check weather.gov (US), weather.gc.ca (Canada), the Met Office (UK), or the Bureau of Meteorology (Australia).
Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
NWS Mount Holly has issued a Severe Thunderstorm Warning for multiple counties in southeastern Pennsylvania, southern New Jersey, and northern Delaware until 6:15 PM EDT.
Read this weather record in 30 seconds
- Record type
- Severe Thunderstorm Warning
- Affected area
- Southeastern Pennsylvania, Southern New Jersey, Northern Delaware
- Issued
- August 20, 2026
- Issuing authority
- NWS Mount Holly NJ
Storm notices can cover different combinations of wind, hail, lightning, and rainfall. Use the original notice for the hazards and boundaries attached to this specific record.
Record status: historical. It was issued 3 days ago; use the issuing agency's live warning service for current conditions in Southeastern Pennsylvania, Southern New Jersey, Northern Delaware.
Alert Details
A Severe Thunderstorm Warning has been issued by the National Weather Service in Mount Holly NJ. The alert is effective from August 20 at 5:27 PM EDT until August 20 at 6:15 PM EDT.
Affected Areas
The warning covers Northern New Castle County in northern Delaware; Northwestern Salem County and Northwestern Gloucester County in southern New Jersey; and Southeastern Berks County, Montgomery County, West central Bucks County, Central Chester County, Philadelphia County, and Delaware County in southeastern Pennsylvania. Locations impacted include Philadelphia, Camden, Wilmington, Newark, West Chester, Norristown, Chester, Pottstown, West Deptford, Phoenixville, Lansdale, West Norriton, East Norriton, Pennsville, and Yeadon.
What You Should Do
Remain alert for a possible tornado. Move to an interior room on the lowest floor of a building. If you spot a tornado, go at once into the basement or a small central room in a sturdy structure.
Expected Conditions
At 5:27 PM EDT, severe thunderstorms were located along a line extending from Bechtelsville to Marshallton to Glen Westover, moving east at 40 mph. Hazards include 70 mph wind gusts. Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. Hail up to 0.75 inches is radar indicated.
Timeline
The warning is in effect until 6:15 PM EDT on August 20, 2026. A Tornado Watch remains in effect until 10:00 PM EDT for the region.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,456 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to August 20, 2026.
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