This alert expired on 3 September 2026 at 13:15 UTC. It is kept here as a record.
It is the 3rd strongest of the 16 detections recorded within 20 km of this point since 4 July 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flood Warning issued September 3 at 5:26AM EDT until September 3 at 9:15AM EDT by NWS Mount Holly NJ
An estimated 29,201 people live within 50 km of this point.
Nearby, since 4 July 2026
- August 3, 2026 · score 34 · 9.3 km
- August 27, 2026 · score 39 · 17.5 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 28 out of 100, at 92 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 28 / 100 |
| Our confidence | 92% |
| Coordinates | 40.8271, -76.9695 |
| Nearest City | Williamsport (46 km) |
| Population Exposed | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T09:26:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.7b89cb353fc3b28e2f62c9e0778fe3039c6a53fd.001.1 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | New Castle, DE; Burlington, NJ; Camden, NJ; Gloucester, NJ; Salem, NJ; Bucks, PA; Chester, PA; Delaware, PA; Montgomery, PA; Philadelphia, PA; Clinton, PA; Lycoming, PA; Centre, PA; Clinton, PA; Lycoming, PA; Union, PA and 5 more areas |
| Headline | Flood Warning issued September 3 at 5:26AM EDT until September 3 at 9:15AM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-03T09:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7b89cb353fc3b28e2f62c9e0778fe3039c6a53fd.001.1","noaa_urn:oid:2.49.0.1.840.0.4f098a21cee169a6749ef2acbd635de5832fb242.001.1","noaa_urn:oid:2.49.0.1.840.0.db85b2eeffd8e23c0fbb60695c6cc3b3e3217bd6.001.1","noaa_urn:oid:2.49.0.1.840.0.e57d4adbff57783c6e24fe0eeb2ee2de2bc197b2.001.1","noaa_urn:oid:2.49.0.1.840.0.2929c0880e22d063ccc4cf17966a03fdea30c67a.001.1","noaa_urn:oid:2.49.0.1.840.0.8d5178b20563d964a2794ca38e4b453231e4ac5e.001.1","noaa_urn:oid:2.49.0.1.840.0.9e1df72155e40b4ec43fd8af9b912c2a9bde5415.001.1","noaa_urn:oid:2.49.0.1.840.0.43b5fad245b3081d89bd519252b12160e8d2eedd.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 3 WNW Lamar |
| Spc County | Clinton |
| Spc State | PA |
| Spc Comments | Tree down in Porter Township by I-80 EB. (CTP) |
| Iem TypeSummary | F |
| Iem City | 1 NE Mechanicsville |
| Iem County | Montour |
| Iem State | PA |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 28/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.