Right now
The most recent data we hold from NOAA arrived 3 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 5 July 2026 at 02:30 UTC. It is kept here as a record.
No stronger detection stands among the 98 recorded within 20 km of this point since 15 March 2026 — 41 others scored the same. The last comparable one was on 4 July 2026. 15 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 4 at 7:21PM CDT until July 4 at 9:30PM CDT by NWS St Louis MO
Urban PEI: 1,305,532 within a heuristic 50 km radius; not unique people.
Nearby, since 15 March 2026
- July 5, 2026 · score 52 · 0.0 km
- July 4, 2026 · score 52 · 0.0 km
- March 16, 2026 · score 52 · 4.5 km
How we know
10 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 38.5947, -90.5016 |
| Nearest City | Manchester (1 km) |
| Urban exposure index (PEI) | 1.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-05T00:21:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.6ee1673f5e68d3f2ce14de30a75ca01ca96e30de.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: 2026-07-05T00:21:00.000Z.
First archived: 2026-07-05T02:22:01.806Z. 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 | St. Louis, MO; St. Louis City, MO |
| Headline | Flash Flood Warning issued July 4 at 7:21PM CDT until July 4 at 9:30PM CDT by NWS St Louis MO |
| Expires | 2026-07-04T21:30:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | Washington |
| Iem County | Franklin |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | Emergency management reported severe large trees down within the Washington city limits. Time estimated by radar. |
| MergedSources | [{"id":"iem_D_38.650_-90.590_1783199280000","source":"iem","severity":"low","severityValue":25,"timestamp":1783199280000,"latitude":38.65,"longitude":-90.59},{"id":"iem_F_38.600_-90.490_1783202100000","source":"iem","severity":"low","severityValue":25,"timestamp":1783202100000,"latitude":38.6,"longitude":-90.49},{"id":"iem_D_38.720_-90.600_1783196100000","source":"iem","severity":"low","severityValue":25,"timestamp":1783196100000,"latitude":38.72,"longitude":-90.6},{"id":"iem_D_37.930_-90.600_1783199100000","source":"iem","severity":"low","severityValue":25,"timestamp":1783199100000,"latitude":37.93,"longitude":-90.6},{"id":"iem_D_38.540_-90.990_1783197360000","source":"iem","severity":"low","severityValue":25,"timestamp":1783197360000,"latitude":38.54,"longitude":-90.99},{"id":"iem_F_38.580_-90.520_1783202580000","source":"iem","severity":"low","severityValue":25,"timestamp":1783202580000,"latitude":38.58,"longitude":-90.52},{"id":"iem_D_38.690_-90.420_1783200600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783200600000,"latitude":38.69,"longitude":-90.42},{"id":"iem_D_38.540_-90.990_1783200960000","source":"iem","severity":"low","severityValue":25,"timestamp":1783200960000,"latitude":38.54,"longitude":-90.99},{"id":"iem_D_38.550_-91.010_1783197180000","source":"iem","severity":"low","severityValue":25,"timestamp":1783197180000,"latitude":38.55,"longitude":-91.01}] |
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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