Right now
The most recent data we hold from NOAA arrived 41 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 14 May 2026 at 00:48 UTC. It is kept here as a record.
No stronger detection stands among the 44 recorded within 20 km of this point since 17 March 2026 — 18 others scored the same. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 6:38PM MDT until May 13 at 6:45PM MDT by NWS Great Falls MT
How we know
Confirmed by 4 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 71 % 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 | 71% |
| Coordinates | 46.8953, -108.8650 |
| Nearest City | Billings (127 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-14T00:38:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.4dd04292be93e77caf11b83203ac4b06 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Fergus, MT; Sweet Grass, MT; Garfield, MT; Petroleum, MT; Phillips, MT; Valley, MT and 2 more areas |
| Headline | Severe Thunderstorm Warning issued May 13 at 6:38PM MDT until May 13 at 6:45PM MDT by NWS Great Falls MT |
| Expires | 2026-05-13T18:48:00-06:00 |
| SenderName | NWS Great Falls MT |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.4dd04292be93e77caf11b83203ac4b06e61f1cf0.001.1","noaa_urn:oid:2.49.0.1.840.0.a37762535717e5b1dbbe11f7e824a40edfa43625.001.1","noaa_urn:oid:2.49.0.1.840.0.920023d91764e4ebad495b3dab1d7a935beaab26.001.1","noaa_urn:oid:2.49.0.1.840.0.5ce57a62b3c090ff374490354259e91bed87c320.001.1","noaa_urn:oid:2.49.0.1.840.0.850d10aa5d750255c17311badd4531f5da534327.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 72 |
| Iem Unit | MPH |
| Iem City | 6 SE Tiegen |
| Iem County | Petroleum |
| Iem State | MT |
| Iem Wfo | GGW |
| Iem Remark | Winnett SW station (WIEM8). |
| MergedSources | [{"id":"iem_G_47.010_-108.360_1778716800000","source":"iem","severity":"low","severityValue":25,"timestamp":1778716800000,"latitude":47.01,"longitude":-108.36},{"id":"iem_G_47.140_-108.590_1778717100000","source":"iem","severity":"low","severityValue":25,"timestamp":1778717100000,"latitude":47.14,"longitude":-108.59},{"id":"iem_G_46.970_-108.500_1778716500000","source":"iem","severity":"low","severityValue":25,"timestamp":1778716500000,"latitude":46.97,"longitude":-108.5}] |
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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