This alert expired on 28 August 2026 at 21:00 UTC. It is kept here as a record.
It is the 4th strongest of the 278 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flash Flood Warning issued August 28 at 1:39PM EDT until August 28 at 5:00PM EDT by NWS Mount Holly NJ
An estimated 39,403 people live within 50 km of this point.
Nearby, since 16 March 2026
- September 4, 2026 · score 16 · 5.9 km
- September 2, 2026 · score 32 · 19.5 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 86 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 34 / 100 |
| Our confidence | 86% |
| Coordinates | 38.8330, -75.1385 |
| Nearest City | Dover (49 km) |
| Population Exposed | 39.4K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-28T17:39:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.82dd7b24daa35e51e17ca093a8a3be5b |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Atlantic, NJ; Sussex, DE; Somerset, MD; Wicomico, MD |
| Headline | Flash Flood Warning issued August 28 at 1:39PM EDT until August 28 at 5:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-08-28T17:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.82dd7b24daa35e51e17ca093a8a3be5bf3139952.001.1","noaa_urn:oid:2.49.0.1.840.0.a5f540b9469d1b82dbd53b1958f017a1cb7187eb.001.1","noaa_urn:oid:2.49.0.1.840.0.f561ea41d84ac5993c91a57ff2548b0b07507b5f.001.1"] |
| Iem TypeSummary | F |
| Iem City | 1 WSW Salisbury |
| Iem County | Wicomico |
| Iem State | MD |
| Iem Wfo | AKQ |
| Iem Remark | Reports and pictures of street flooding in downtown Salisbury. |
| MergedSources | [{"id":"iem_F_38.370_-75.600_1787934420000","source":"iem","severity":"low","severityValue":25,"timestamp":1787934420000,"latitude":38.37,"longitude":-75.6}] |
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 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.