Right now
The most recent data we hold from SPC arrived 20 minutes ago, and this point is in it.
Reported by SPC today.
What the source measured
SPC reported: Hail 100 in near 2 N Mountain City, Johnson, TN. Trained spotter reported quarter sized hail near the intersection of Liberty Church Road and Cold Springs Road north of Mountain City. (MRX)
Urban PEI: 61,963 within a heuristic 50 km radius; not unique people.
How we know
2 recorded sources include SPC; independence is not established by this count.
Our own score for this event is 45 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) | 45 / 100 |
| Legacy data-support index | 0.83/1 |
| Coordinates | 36.5000, -81.8200 |
| Nearest City | Boone (34 km) |
| Urban exposure index (PEI) | 62.0K within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-09-22T00:17:43.774Z |
| 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: 2026-09-22T00:17:43.774Z.
First archived: 2026-09-22T00:19:20.846Z. 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
| ReportType | hail |
| Speed | 100 |
| Location | 2 N Mountain City |
| County | Johnson |
| State | TN |
| Comments | Trained spotter reported quarter sized hail near the intersection of Liberty Church Road and Cold Springs Road north of Mountain City. (MRX) |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 2 N Mountain City |
| Iem County | Johnson |
| Iem State | TN |
| Iem Wfo | MRX |
| Iem Remark | Trained spotter reported quarter sized hail near the intersection of Liberty Church Road and Cold Springs Road north of Mountain City. |
| MergedSources | [{"id":"iem_H_36.500_-81.820_1790032200000","source":"iem","severity":"low","severityValue":25,"timestamp":1790032200000,"latitude":36.5,"longitude":-81.82}] |
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.
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