Right now
The most recent data we hold from NOAA arrived 2 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 13 May 2026 at 23:00 UTC. It is kept here as a record.
No stronger detection stands among the 30 recorded within 20 km of this point since 15 March 2026 — 2 others scored the same. The last comparable one was on 7 May 2026. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 3:58PM MDT until May 13 at 5:00PM MDT by NWS Billings MT
How we know
Confirmed by 17 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 70 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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) | 22 / 100 |
| Our confidence | 70% |
| Coordinates | 46.0012, -109.9435 |
| Nearest City | Bozeman (92 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-13T21:58:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.eb4bdb63259df0e8f5b334fbc9b84d74fd938db5.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Park, MT; Stillwater, MT; Sweet Grass, MT |
| Headline | Severe Thunderstorm Warning issued May 13 at 3:58PM MDT until May 13 at 5:00PM MDT by NWS Billings MT |
| Expires | 2026-05-13T17:00:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | true |
| Iem TypeSummary | N |
| Iem Magnitude | 56 |
| Iem Unit | MPH |
| Iem City | 1 SSE Livingston |
| Iem County | Park |
| Iem State | MT |
| Iem Wfo | BYZ |
| Iem Remark | Mesonet station MTLRH Livingston River Hill. |
| MergedSources | [{"id":"iem_G_45.720_-110.250_1778709600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709600000,"latitude":45.72,"longitude":-110.25},{"id":"iem_N_45.700_-110.430_1778701320000","source":"iem","severity":"low","severityValue":25,"timestamp":1778701320000,"latitude":45.7,"longitude":-110.43},{"id":"iem_G_45.640_-110.550_1778709600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709600000,"latitude":45.64,"longitude":-110.55},{"id":"iem_G_45.800_-109.970_1778710500000","source":"iem","severity":"low","severityValue":25,"timestamp":1778710500000,"latitude":45.8,"longitude":-109.97},{"id":"iem_N_45.640_-110.550_1778700600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778700600000,"latitude":45.64,"longitude":-110.55},{"id":"iem_N_45.640_-110.550_1778702400000","source":"iem","severity":"low","severityValue":25,"timestamp":1778702400000,"latitude":45.64,"longitude":-110.55},{"id":"iem_G_45.650_-110.600_1778709600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709600000,"latitude":45.65,"longitude":-110.6},{"id":"iem_G_45.640_-110.550_1778708700000","source":"iem","severity":"low","severityValue":25,"timestamp":1778708700000,"latitude":45.64,"longitude":-110.55},{"id":"iem_N_45.700_-110.430_1778704800000","source":"iem","severity":"low","severityValue":25,"timestamp":1778704800000,"latitude":45.7,"longitude":-110.43},{"id":"iem_N_45.500_-110.570_1778702400000","source":"iem","severity":"low","severityValue":25,"timestamp":1778702400000,"latitude":45.5,"longitude":-110.57},{"id":"iem_N_45.640_-110.550_1778699700000","source":"iem","severity":"low","severityValue":25,"timestamp":1778699700000,"latitude":45.64,"longitude":-110.55},{"id":"iem_G_45.500_-110.570_1778707800000","source":"iem","severity":"low","severityValue":25,"timestamp":1778707800000,"latitude":45.5,"longitude":-110.57},{"id":"iem_G_45.840_-109.950_1778710500000","source":"iem","severity":"low","severityValue":25,"timestamp":1778710500000,"latitude":45.84,"longitude":-109.95},{"id":"iem_G_45.690_-110.500_1778708700000","source":"iem","severity":"low","severityValue":25,"timestamp":1778708700000,"latitude":45.69,"longitude":-110.5},{"id":"iem_G_45.700_-110.430_1778709180000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709180000,"latitude":45.7,"longitude":-110.43},{"id":"iem_N_45.640_-110.550_1778703300000","source":"iem","severity":"low","severityValue":25,"timestamp":1778703300000,"latitude":45.64,"longitude":-110.55}] |
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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Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.