This alert expired on 5 July 2026 at 01:00 UTC. It is kept here as a record.
No stronger detection stands among the 64 recorded within 20 km of this point since 16 March 2026 — 47 others scored the same. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 4 at 5:59PM EDT until July 4 at 9:00PM EDT by NWS Peachtree City GA
An estimated 1,817,227 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 17, 2026 · score 52 · 1.4 km
- July 24, 2026 · score 52 · 9.3 km
- July 4, 2026 · score 52 · 11.1 km
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 89 % 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) | 52 / 100 |
| Our confidence | 89% |
| Coordinates | 33.9525, -84.2062 |
| Nearest City | Norcross (1 km) |
| Population Exposed | 1.8M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-04T21:59:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.1dc278880ae15bc2390123a116884061b71b1747.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | DeKalb, GA; Gwinnett, GA |
| Headline | Flash Flood Warning issued July 4 at 5:59PM EDT until July 4 at 9:00PM EDT by NWS Peachtree City GA |
| Expires | 2026-07-04T21:00:00-04:00 |
| SenderName | NWS Peachtree City GA |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | Duluth |
| Iem County | Gwinnett |
| Iem State | GA |
| Iem Wfo | FFC |
| Iem Remark | Storm Spotter reported 1 inch hail in Duluth, GA. |
| MergedSources | [{"id":"iem_H_33.990_-83.900_1783200720000","source":"iem","severity":"low","severityValue":25,"timestamp":1783200720000,"latitude":33.99,"longitude":-83.9},{"id":"iem_D_33.870_-84.250_1783200600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783200600000,"latitude":33.87,"longitude":-84.25},{"id":"iem_H_34.000_-84.150_1783201800000","source":"iem","severity":"low","severityValue":25,"timestamp":1783201800000,"latitude":34,"longitude":-84.15}] |
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 near Norcross?
Calamity.live data shows a weather event with CalamityScore 52/100, near Norcross (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.