This alert expired on 3 September 2026 at 06:30 UTC. It is kept here as a record.
No stronger detection stands among the 22 recorded within 20 km of this point since 16 March 2026 — one other scored the same. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Flood Warning issued September 3 at 1:16AM EDT until September 3 at 2:30AM EDT by NWS Burlington VT
An estimated 109,004 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 29, 2026 · score 34 · 6.6 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 37 out of 100, at 87 % 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) | 37 / 100 |
| Our confidence | 87% |
| Coordinates | 44.9448, -74.5738 |
| Nearest City | Cornwall (15 km) |
| Population Exposed | 109.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-03T05:16:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.baf91a931666018cfe8241d68585e194b578bb2f.001.1 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Clinton, NY; Franklin, NY; St. Lawrence, NY |
| Headline | Flood Warning issued September 3 at 1:16AM EDT until September 3 at 2:30AM EDT by NWS Burlington VT |
| Expires | 2026-09-03T02:30:00-04:00 |
| SenderName | NWS Burlington VT |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 3.33 |
| Iem Unit | Inch |
| Iem City | Helena |
| Iem County | St. Lawrence |
| Iem State | NY |
| Iem Wfo | BTV |
| MergedSources | [{"id":"iem_E_44.930_-74.890_1788408660000","source":"iem","severity":"low","severityValue":25,"timestamp":1788408660000,"latitude":44.93,"longitude":-74.89},{"id":"iem_R_44.940_-74.940_1788407040000","source":"iem","severity":"low","severityValue":25,"timestamp":1788407040000,"latitude":44.94,"longitude":-74.94},{"id":"iem_R_44.970_-74.470_1788407160000","source":"iem","severity":"low","severityValue":25,"timestamp":1788407160000,"latitude":44.97,"longitude":-74.47},{"id":"iem_R_44.920_-74.890_1788407100000","source":"iem","severity":"low","severityValue":25,"timestamp":1788407100000,"latitude":44.92,"longitude":-74.89},{"id":"iem_R_44.900_-74.300_1788407160000","source":"iem","severity":"low","severityValue":25,"timestamp":1788407160000,"latitude":44.9,"longitude":-74.3},{"id":"iem_R_44.920_-74.720_1788407100000","source":"iem","severity":"low","severityValue":25,"timestamp":1788407100000,"latitude":44.92,"longitude":-74.72}] |
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 Cornwall?
Calamity.live data shows a weather event with CalamityScore 37/100, near Cornwall (Canada), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.