Right now
The most recent data we hold from NOAA arrived 19 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 18 July 2026 at 01:15 UTC. It is kept here as a record.
What the source measured
NOAA reported: Flash Flood Warning issued July 17 at 5:09PM MDT until July 17 at 7:15PM MDT by NWS Missoula MT
Urban PEI: 71,022 within a heuristic 50 km radius; not unique people.
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 39 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) | 39 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 46.7683, -113.4804 |
| Nearest City | Missoula (40 km) |
| Urban exposure index (PEI) | 71.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-17T23:09:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.c33a702f89d9c4d74e64e011356d0948 |
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: 2026-07-17T23:09:00.000Z.
First archived: 2026-07-18T00:40:37.259Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Missoula, MT; Powell, MT; Granite, MT |
| Headline | Flash Flood Warning issued July 17 at 5:09PM MDT until July 17 at 7:15PM MDT by NWS Missoula MT |
| Expires | 2026-07-17T19:15:00-06:00 |
| SenderName | NWS Missoula MT |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.c33a702f89d9c4d74e64e011356d09487e5bd1af.001.1","noaa_urn:oid:2.49.0.1.840.0.1bf2f8a7739767e2ac8143b54086d98dfbbd4b4b.001.1"] |
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.
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