Right now
The most recent data we hold from SPC arrived 21 minutes ago, and this point is in it.
8 other detections within 20 km in the last 24 hours, the nearest <1 km from here.
Reported by SPC today.
No stronger detection stands among the 63 recorded within 20 km of this point since 17 April 2026 — 7 others scored the same. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
SPC reported: Hail 100 in near 1 SW Saint Paul, St. Charles, MO. (LSX)
Urban PEI: 754,386 within a heuristic 50 km radius; not unique people.
Nearby, since 17 April 2026
- September 17, 2026 · score 54 · 5.0 km
- June 8, 2026 · score 52 · 13.0 km
- June 25, 2026 · score 52 · 20.1 km
How we know
2 recorded sources include SPC; independence is not established by this count.
Our own score for this event is 54 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | High |
| Calamity Score (ours) | 54 / 100 |
| Legacy data-support index | 0.75/1 |
| Coordinates | 38.8400, -90.7400 |
| Nearest City | O'Fallon (5 km) |
| Urban exposure index (PEI) | 754.4K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-18T02:08:21.345Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
Physical priority index · v5. 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: spc. Occurrence: 2026-09-18T02:08:21.345Z.
First archived: 2026-09-18T01:55:01.897Z. Material modification: 2026-09-18T02:11:08.233Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-18T02:11:08.233Z · data_change
Index 54 → 54; severity high → high; version 5 → 5.
2026-09-18T02:05:51.244Z · data_change
Index 54 → 54; severity high → high; version 5 → 5.
2026-09-18T02:00:33.952Z · data_change
Index 54 → 54; severity high → high; version 5 → 5.
Score Breakdown
Technical Details
| ReportType | hail |
| Speed | 100 |
| Location | 1 SW Saint Paul |
| County | St. Charles |
| State | MO |
| Comments | (LSX) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 1 SW Saint Paul |
| Iem County | St. Charles |
| Iem State | MO |
| Iem Wfo | LSX |
| MergedSources | [{"id":"iem_H_38.840_-90.740_1789677480000","source":"iem","severity":"low","severityValue":25,"timestamp":1789677480000,"latitude":38.84,"longitude":-90.74}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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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