Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 5 August 2026 at 22:15 UTC. It is kept here as a record.
What the source measured
NOAA reported: Flash Flood Warning issued August 5 at 2:17PM EDT until August 5 at 6:15PM EDT by NWS Mount Holly NJ
Urban PEI: 3,651,451 within a heuristic 50 km radius; not unique people.
How we know
12 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 46 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 40.0496, -75.0078 |
| Nearest City | Holmesburg (2 km) |
| Urban exposure index (PEI) | 3.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-05T18:17:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.509feb22b24c9fcaf85e1392f80f28d7 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-08-05T18:17:00.000Z.
First archived: 2026-08-05T18:28:51.024Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Bucks, PA; Montgomery, PA; Burlington, NJ; Mercer, NJ; Bucks, PA; Gloucester, NJ; Delaware, PA; Montgomery, PA; Philadelphia, PA and 1 more areas |
| Headline | Flash Flood Warning issued August 5 at 2:17PM EDT until August 5 at 6:15PM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-05T18:15:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.509feb22b24c9fcaf85e1392f80f28d7aa56ea3b.001.1","noaa_urn:oid:2.49.0.1.840.0.ca03e4dcb7d71b932206fe5f54f8dfaa9afe8be8.001.1","noaa_urn:oid:2.49.0.1.840.0.56518ef62b2471012ef25a251998654e92054597.001.1","noaa_urn:oid:2.49.0.1.840.0.69a419c99087e0b179d4d7151efc655328229d40.001.1"] |
| Iem TypeSummary | F |
| Iem City | 1 SSW Maple Shade |
| Iem County | Camden |
| Iem State | NJ |
| Iem Wfo | PHI |
| Iem Remark | Church Road flooded near Route 38. |
| MergedSources | [{"id":"iem_F_39.950_-74.960_1785951000000","source":"iem","severity":"low","severityValue":25,"timestamp":1785951000000,"latitude":39.95,"longitude":-74.96},{"id":"iem_F_39.940_-75.030_1785951900000","source":"iem","severity":"low","severityValue":25,"timestamp":1785951900000,"latitude":39.94,"longitude":-75.03},{"id":"iem_R_39.990_-75.000_1785952800000","source":"iem","severity":"low","severityValue":25,"timestamp":1785952800000,"latitude":39.99,"longitude":-75},{"id":"iem_R_40.100_-74.870_1785953280000","source":"iem","severity":"low","severityValue":25,"timestamp":1785953280000,"latitude":40.1,"longitude":-74.87},{"id":"iem_F_39.900_-75.190_1785952200000","source":"iem","severity":"low","severityValue":25,"timestamp":1785952200000,"latitude":39.9,"longitude":-75.19},{"id":"iem_F_39.920_-75.190_1785952800000","source":"iem","severity":"low","severityValue":25,"timestamp":1785952800000,"latitude":39.92,"longitude":-75.19},{"id":"iem_O_40.020_-74.850_1785949560000","source":"iem","severity":"low","severityValue":25,"timestamp":1785949560000,"latitude":40.02,"longitude":-74.85},{"id":"iem_R_39.940_-75.150_1785953100000","source":"iem","severity":"low","severityValue":25,"timestamp":1785953100000,"latitude":39.94,"longitude":-75.15},{"id":"iem_R_39.880_-75.230_1785952920000","source":"iem","severity":"low","severityValue":25,"timestamp":1785952920000,"latitude":39.88,"longitude":-75.23},{"id":"iem_F_40.140_-74.710_1785953100000","source":"iem","severity":"low","severityValue":25,"timestamp":1785953100000,"latitude":40.14,"longitude":-74.71},{"id":"iem_F_39.940_-75.010_1785951900000","source":"iem","severity":"low","severityValue":25,"timestamp":1785951900000,"latitude":39.94,"longitude":-75.01}] |
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.
Review the area, threshold and delivery channel in your account.
Want to know when something happens near Holmesburg?