Right now
The most recent data we hold from NOAA arrived 14 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 00:30 UTC. It is kept here as a record.
No stronger detection stands among the 29 recorded within 20 km of this point since 17 March 2026 — 4 others scored the same. The last comparable one was on 23 April 2026.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 6:20PM MDT until May 13 at 6:30PM MDT by NWS Billings MT
Nearby, since 17 March 2026
- July 15, 2026 · score 22 · 12.2 km
How we know
Confirmed by 24 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 | 45.5267, -109.6225 |
| Nearest City | Billings (92 km) |
| Impact Tier | minor |
| Timestamp | 2026-05-14T00:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.483bda04bf1def7677dab5cae5d2c74d |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Park, MT; Sweet Grass, MT; Carbon, MT; Stillwater, MT |
| Headline | Severe Thunderstorm Warning issued May 13 at 6:20PM MDT until May 13 at 6:30PM MDT by NWS Billings MT |
| Expires | 2026-05-13T18:30:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.483bda04bf1def7677dab5cae5d2c74d9300c193.001.1","noaa_urn:oid:2.49.0.1.840.0.5ce57a62b3c090ff374490354259e91bed87c320.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 54 |
| Iem Unit | MPH |
| Iem City | 4 NW Hailstone Wildlife |
| Iem County | Stillwater |
| Iem State | MT |
| Iem Wfo | BYZ |
| Iem Remark | Mesonet station MTM19 3.9 NW Hailstone Wildlife Refuge (MT-MESO). |
| MergedSources | [{"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},{"id":"iem_G_46.130_-109.920_1778711460000","source":"iem","severity":"low","severityValue":25,"timestamp":1778711460000,"latitude":46.13,"longitude":-109.92},{"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_45.500_-110.570_1778715600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778715600000,"latitude":45.5,"longitude":-110.57},{"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_45.030_-109.410_1778700300000","source":"iem","severity":"low","severityValue":25,"timestamp":1778700300000,"latitude":45.03,"longitude":-109.41},{"id":"iem_N_45.640_-110.550_1778700600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778700600000,"latitude":45.64,"longitude":-110.55},{"id":"iem_G_45.580_-109.880_1778711700000","source":"iem","severity":"low","severityValue":25,"timestamp":1778711700000,"latitude":45.58,"longitude":-109.88},{"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_45.710_-109.580_1778711460000","source":"iem","severity":"low","severityValue":25,"timestamp":1778711460000,"latitude":45.71,"longitude":-109.58},{"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_G_45.800_-109.430_1778711400000","source":"iem","severity":"low","severityValue":25,"timestamp":1778711400000,"latitude":45.8,"longitude":-109.43},{"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_N_45.030_-109.410_1778714700000","source":"iem","severity":"low","severityValue":25,"timestamp":1778714700000,"latitude":45.03,"longitude":-109.41},{"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_46.040_-109.240_1778713200000","source":"iem","severity":"low","severityValue":25,"timestamp":1778713200000,"latitude":46.04,"longitude":-109.24}] |
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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