Right now
The most recent data we hold from NOAA arrived 2 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 21 July 2026 at 18:30 UTC. It is kept here as a record.
It is the 31st strongest of the 98 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 18 July 2026. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 21 at 1:29PM EDT until July 21 at 2:30PM EDT by NWS Buffalo NY
Urban PEI: 1,083,910 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- July 21, 2026 · score 46 · 2.2 km
- July 1, 2026 · score 52 · 2.6 km
- July 28, 2026 · score 52 · 4.2 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 0.80/1 |
| Coordinates | 43.1286, -78.9462 |
| Nearest City | Niagara Falls (10 km) |
| Urban exposure index (PEI) | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-21T17:29:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.688c23937352ae453f8a444c844ad05fdc21ac4f.001.1 |
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: 2026-07-21T17:29:00.000Z.
First archived: 2026-07-21T18:27:42.572Z. 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 | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Upper Niagara River and Buffalo Harbor; Lower Niagara River; Niagara River to Hamlin Beach NY; Niagara River to Hamlin Beach NY beyond 5NM off shoreline to US-Canadian border |
| Headline | Special Marine Warning issued July 21 at 1:29PM EDT until July 21 at 2:30PM EDT by NWS Buffalo NY |
| Expires | 2026-07-21T14:30:00-04:00 |
| SenderName | NWS Buffalo NY |
| HasExactCoords | true |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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.
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