This event is no longer active — it's kept here as a record. Recovery may still be underway; the guidance below applies.
Part of: Wabash County Area Flooding — August 2026 →
Flash Flood Warning issued August 20 at 6:26PM EDT until August 20 at 10:30PM EDT by NWS Mount Holly NJ
This is a severe-significance flash flood warning event affecting Mercer, NJ; Bucks, PA; Montgomery, PA; Philadelphia, PA, tracked from official feeds (NOAA / National Weather Service). We update this page as the situation develops.
- Type
- Flash Flood Warning
- Extent
- ≈ 302,092 acres
- Began
- To end
Affected by this event? Open your area's damage guides below to reach a vetted local restoration pro, 24/7.
Affected area map
The shaded area is the affected-area perimeter reported for this event by NOAA / National Weather Service (Mercer, NJ; Bucks, PA; Montgomery, PA; Philadelphia, PA), colored by hazard type. Pan and zoom to explore the map; when more than one observation exists, use the slider below to step through how the reported area changed.
Interactive affected-area map
Mercer, NJ; Bucks, PA; Montgomery, PA; Philadelphia, PA · ≈ 470 sq mi reported extent · Enable JavaScript to explore the map.
Shown as reported by our sources — not an official product. For current advisories and the authoritative map, see NOAA / National Weather Service ↗.
Restoration help near this event
Tap your city for a vetted local pro on that service, answered 24/7. Where we don't have a nearby city page yet, the step-by-step guides cover what to do first.
Water damage restoration
What to do now
Mold remediation
What to do now
Latest updates
Official updates and news coverage for this event, newest first — National Weather Service products, local storm reports, incident updates and press headlines. Official items are verbatim government text; news headlines link out to the original outlet.
- Storm report NWS OKX storm report
FLASH FLOOD — Harrison, NJ
Water rescues being conducted.
- Storm report NWS OKX storm report
FLASH FLOOD — 1 SSW Clifton, NJ
Flooding on NJ 3 Westbound East of Garden State Parkway, 2 left lanes of 3 lanes closed. Reported by 511nj.org.
- Storm report NWS CTP storm report
FLASH FLOOD — 3 E Akron, PA
A couple of reports of water across roadways jus to the southeast of Akron.
- Bulletin NWS Mount Holly NJ
Flash Flood Warning issued
Mercer, NJ; Bucks, PA; Montgomery, PA; Philadelphia, PA
Show 3 earlier updates
- WKEF News
- WHIO TV News
- The Daily Reporter - Greenfield Indiana News
HELPING HANDS: Local agencies seek public’s support in aiding flood victims
Updates are captured automatically from official and news sources, and may lag the live source. For the very latest, see NOAA / National Weather Service ↗.