Right now
The most recent data we hold from NOAA arrived 45 minutes 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 1 August 2026 at 10:00 UTC. It is kept here as a record.
It is the 12th strongest of the 26 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 31 July 2026. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued July 31 at 9:29PM CDT until August 1 at 5:00AM CDT by NWS St Louis MO
Urban PEI: 20,019 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- May 31, 2026 · score 34 · 4.7 km
How we know
5 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 28 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) | 28 / 100 |
| Legacy data-support index | 0.92/1 |
| Coordinates | 38.0011, -91.3911 |
| Nearest City | Rolla (34 km) |
| Urban exposure index (PEI) | 20.0K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-01T02:29:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.9c3b4198ba6f37d2462d3e188fee7fc86d742f9e.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: 2026-08-01T02:29:00.000Z.
First archived: 2026-08-01T09:57:11.811Z. 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 | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Crawford, MO |
| Headline | Flood Warning issued July 31 at 9:29PM CDT until August 1 at 5:00AM CDT by NWS St Louis MO |
| Expires | 2026-08-01T05:00:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 3 NNW Frankclay |
| Iem County | St. Francois |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | Large tree down across St. Francois Road in Terre Du Lac. Time estimated from radar. |
| MergedSources | [{"id":"iem_E_37.960_-90.760_1785551760000","source":"iem","severity":"low","severityValue":25,"timestamp":1785551760000,"latitude":37.96,"longitude":-90.76},{"id":"iem_D_37.720_-90.620_1785552060000","source":"iem","severity":"low","severityValue":25,"timestamp":1785552060000,"latitude":37.72,"longitude":-90.62},{"id":"iem_D_37.810_-90.590_1785552360000","source":"iem","severity":"low","severityValue":25,"timestamp":1785552360000,"latitude":37.81,"longitude":-90.59},{"id":"iem_D_37.900_-90.640_1785552060000","source":"iem","severity":"low","severityValue":25,"timestamp":1785552060000,"latitude":37.9,"longitude":-90.64}] |
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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