Right now
The most recent data we hold from NOAA arrived 1 minute 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 6 August 2026 at 18:30 UTC. It is kept here as a record.
It is the 42nd strongest of the 81 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 6 at 10:30AM CDT until August 6 at 1:30PM CDT by NWS St Louis MO
Urban PEI: 171,925 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- June 24, 2026 · score 43 · 9.0 km
- August 7, 2026 · score 43 · 16.1 km
- June 14, 2026 · score 43 · 17.2 km
How we know
12 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 37 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) | 37 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 38.9390, -92.4930 |
| Nearest City | Columbia (14 km) |
| Urban exposure index (PEI) | 171.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-06T15:30:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.97d507c1056ca351ee611dd602dee5fd |
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: 2026-08-06T15:30:00.000Z.
First archived: 2026-08-06T18:10:41.228Z. 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 | Boone, MO; Cooper, MO; Howard, MO; Saline, MO |
| Headline | Flash Flood Warning issued August 6 at 10:30AM CDT until August 6 at 1:30PM CDT by NWS St Louis MO |
| Expires | 2026-08-06T13:30:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.97d507c1056ca351ee611dd602dee5fd8e0bdace.001.1","noaa_urn:oid:2.49.0.1.840.0.e05238501f21dfb398f1179e9613144260fe5baf.001.1"] |
| Iem TypeSummary | F |
| Iem City | 5 ESE Columbia |
| Iem County | Boone |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | E Highway WW at Old Hawthorne Dr closed due to flood waters. |
| MergedSources | [{"id":"iem_R_38.950_-92.330_1786034580000","source":"iem","severity":"low","severityValue":25,"timestamp":1786034580000,"latitude":38.95,"longitude":-92.33},{"id":"iem_F_38.960_-92.340_1786034280000","source":"iem","severity":"low","severityValue":25,"timestamp":1786034280000,"latitude":38.96,"longitude":-92.34},{"id":"iem_F_38.880_-92.360_1786037820000","source":"iem","severity":"low","severityValue":25,"timestamp":1786037820000,"latitude":38.88,"longitude":-92.36},{"id":"iem_F_38.950_-92.330_1786033440000","source":"iem","severity":"low","severityValue":25,"timestamp":1786033440000,"latitude":38.95,"longitude":-92.33},{"id":"iem_F_38.950_-92.380_1786033500000","source":"iem","severity":"low","severityValue":25,"timestamp":1786033500000,"latitude":38.95,"longitude":-92.38},{"id":"iem_F_39.010_-92.810_1786036140000","source":"iem","severity":"low","severityValue":25,"timestamp":1786036140000,"latitude":39.01,"longitude":-92.81},{"id":"iem_F_38.960_-92.400_1786032780000","source":"iem","severity":"low","severityValue":25,"timestamp":1786032780000,"latitude":38.96,"longitude":-92.4},{"id":"iem_F_38.930_-92.400_1786035480000","source":"iem","severity":"low","severityValue":25,"timestamp":1786035480000,"latitude":38.93,"longitude":-92.4},{"id":"iem_R_38.950_-92.330_1786031880000","source":"iem","severity":"low","severityValue":25,"timestamp":1786031880000,"latitude":38.95,"longitude":-92.33},{"id":"iem_F_38.980_-92.440_1786032000000","source":"iem","severity":"low","severityValue":25,"timestamp":1786032000000,"latitude":38.98,"longitude":-92.44},{"id":"iem_F_38.930_-92.250_1786034280000","source":"iem","severity":"low","severityValue":25,"timestamp":1786034280000,"latitude":38.93,"longitude":-92.25}] |
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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