Right now
The most recent data we hold from NOAA arrived 31 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
14 other detections within 20 km in the last 24 hours, the nearest 2 km from here.
This alert expired on 18 September 2026 at 08:45 UTC. It is kept here as a record.
No stronger detection stands among the 59 recorded within 20 km of this point since 25 March 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 17 at 9:51PM MDT until September 18 at 2:45AM MDT by NWS Pocatello ID
Urban PEI: 86,847 within a heuristic 50 km radius; not unique people.
Nearby, since 25 March 2026
- September 18, 2026 · score 45 · 12.1 km
- August 13, 2026 · score 39 · 19.7 km
- May 13, 2026 · score 39 · 24.0 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 45 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 45 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 43.8218, -111.7600 |
| Nearest City | Rexburg (3 km) |
| Urban exposure index (PEI) | 86.8K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-18T03:51:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.a28789e61ad4c02368d41a4d7cfa6b2009bd536a.001.1 |
Physical priority index · v5. 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: 2026-09-18T03:51:00.000Z.
First archived: 2026-09-18T03:56:57.315Z. Material modification: 2026-09-18T08:35:59.095Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-18T08:41:21.428Z · data_change
Index 45 → 45; severity high → high; version 5 → 5.
2026-09-18T08:35:59.095Z · data_change
Index 32 → 45; severity medium → high; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Madison, ID |
| Headline | Flash Flood Warning issued September 17 at 9:51PM MDT until September 18 at 2:45AM MDT by NWS Pocatello ID |
| Expires | 2026-09-18T02:45:00-06:00 |
| SenderName | NWS Pocatello ID |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 175 |
| Spc Location | 2 WNW Shelley |
| Spc County | Bingham |
| Spc State | ID |
| Spc Comments | Reports of hail up to the size of golf balls in the Journeys End Neighborhood. Reports via Facebook. (PIH) |
| Iem TypeSummary | F |
| Iem City | Rexburg |
| Iem County | Madison |
| Iem State | ID |
| Iem Wfo | PIH |
| Iem Remark | Reports of multiple flooded basement apartments in Rexburg. Report via Facebook. |
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.
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