Right now
The most recent data we hold from NOAA arrived 3 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 1 June 2026 at 14:30 UTC. It is kept here as a record.
No stronger detection stands among the 128 recorded within 20 km of this point since 15 March 2026 — 95 others scored the same. Another comparable one was recorded here earlier the same day. 74 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued June 1 at 7:38AM CDT until June 1 at 9:30AM CDT by NWS St Louis MO
Urban PEI: 129,330 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- May 21, 2026 · score 43 · 8.0 km
- May 20, 2026 · score 43 · 10.6 km
- June 15, 2026 · score 43 · 14.2 km
How we know
16 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 39.0977, -92.1247 |
| Nearest City | Columbia (24 km) |
| Urban exposure index (PEI) | 129.3K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T12:38:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.9ce4fad519d6dd67a3a3752a1ad049bb |
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: 2026-06-01T12:38:00.000Z.
First archived: 2026-06-01T13:55:45.509Z. 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 | Calhoun, IL; Greene, IL; Jersey, IL; Lincoln, MO; Pike, MO; Boone, MO; Howard, MO and 1 more areas |
| Headline | Flash Flood Warning issued June 1 at 7:38AM CDT until June 1 at 9:30AM CDT by NWS St Louis MO |
| Expires | 2026-06-01T09:30:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 4 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9ce4fad519d6dd67a3a3752a1ad049bb615db5a8.001.1","noaa_urn:oid:2.49.0.1.840.0.54b851eced2949567f444b00aeac8cd786a1ce4e.001.1","noaa_urn:oid:2.49.0.1.840.0.6c7406d468de8af2e76c8ad9d43a84c66c4624b8.001.1","noaa_urn:oid:2.49.0.1.840.0.ea96b58839b82ddfb6d437e37ab53d05d8ad70c5.001.1"] |
| Iem TypeSummary | F |
| Iem City | 3 NNW Columbia |
| Iem County | Boone |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | Emergency Manager reports a high water rescue on Creasy Springs Road. |
| MergedSources | [{"id":"iem_F_38.990_-92.370_1780314300000","source":"iem","severity":"low","severityValue":25,"timestamp":1780314300000,"latitude":38.99,"longitude":-92.37},{"id":"iem_F_39.230_-92.830_1780302600000","source":"iem","severity":"low","severityValue":25,"timestamp":1780302600000,"latitude":39.23,"longitude":-92.83},{"id":"iem_G_39.150_-92.690_1780299540000","source":"iem","severity":"low","severityValue":25,"timestamp":1780299540000,"latitude":39.15,"longitude":-92.69},{"id":"iem_D_39.120_-92.190_1780302840000","source":"iem","severity":"low","severityValue":25,"timestamp":1780302840000,"latitude":39.12,"longitude":-92.19},{"id":"iem_D_38.940_-92.350_1780303680000","source":"iem","severity":"low","severityValue":25,"timestamp":1780303680000,"latitude":38.94,"longitude":-92.35},{"id":"iem_F_39.160_-92.690_1780306860000","source":"iem","severity":"low","severityValue":25,"timestamp":1780306860000,"latitude":39.16,"longitude":-92.69},{"id":"iem_D_38.940_-92.260_1780303500000","source":"iem","severity":"low","severityValue":25,"timestamp":1780303500000,"latitude":38.94,"longitude":-92.26},{"id":"iem_D_38.990_-92.450_1780302540000","source":"iem","severity":"low","severityValue":25,"timestamp":1780302540000,"latitude":38.99,"longitude":-92.45},{"id":"iem_F_39.140_-92.690_1780307100000","source":"iem","severity":"low","severityValue":25,"timestamp":1780307100000,"latitude":39.14,"longitude":-92.69},{"id":"iem_F_39.140_-92.700_1780313040000","source":"iem","severity":"low","severityValue":25,"timestamp":1780313040000,"latitude":39.14,"longitude":-92.7},{"id":"iem_D_38.770_-92.260_1780304520000","source":"iem","severity":"low","severityValue":25,"timestamp":1780304520000,"latitude":38.77,"longitude":-92.26},{"id":"iem_E_39.430_-92.440_1780297620000","source":"iem","severity":"low","severityValue":25,"timestamp":1780297620000,"latitude":39.43,"longitude":-92.44},{"id":"iem_D_39.000_-92.310_1780302660000","source":"iem","severity":"low","severityValue":25,"timestamp":1780302660000,"latitude":39,"longitude":-92.31},{"id":"iem_F_39.150_-92.700_1780310640000","source":"iem","severity":"low","severityValue":25,"timestamp":1780310640000,"latitude":39.15,"longitude":-92.7},{"id":"iem_F_38.980_-92.350_1780308000000","source":"iem","severity":"low","severityValue":25,"timestamp":1780308000000,"latitude":38.98,"longitude":-92.35}] |
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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