Right now
The most recent data we hold from NOAA arrived 3 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
4 other detections within 20 km in the last 24 hours, the nearest 16 km from here.
This alert expired on 14 May 2026 at 01:30 UTC. It is kept here as a record.
No stronger detection stands among the 45 recorded within 20 km of this point since 15 March 2026 — 6 others scored the same. The last comparable one was on 13 May 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 13 at 6:31PM MDT until May 13 at 7:30PM MDT by NWS Billings MT
Nearby, since 15 March 2026
- July 26, 2026 · score 22 · 13.5 km
How we know
24 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 22 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 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 |
| Legacy data-support index | 0.71/1 |
| Coordinates | 45.8548, -109.7105 |
| Nearest City | Billings (94 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-05-14T00:31:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a37762535717e5b1dbbe11f7e824a40edfa43625.001.1 |
Physical priority index · v1. 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: noaa. Occurrence: 2026-05-14T00:31:00.000Z.
First archived: 2026-05-14T01:17:36.737Z. 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
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Sweet Grass, MT |
| Headline | Severe Thunderstorm Warning issued May 13 at 6:31PM MDT until May 13 at 7:30PM MDT by NWS Billings MT |
| Expires | 2026-05-13T19:30:00-06:00 |
| SenderName | NWS Billings MT |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 69 |
| Iem Unit | MPH |
| Iem City | 7 ENE Livingston |
| Iem County | Park |
| Iem State | MT |
| Iem Wfo | BYZ |
| Iem Remark | ASOS station KLVM Livingston. |
| MergedSources | [{"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_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_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_45.800_-109.430_1778711400000","source":"iem","severity":"low","severityValue":25,"timestamp":1778711400000,"latitude":45.8,"longitude":-109.43},{"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_45.650_-110.600_1778716800000","source":"iem","severity":"low","severityValue":25,"timestamp":1778716800000,"latitude":45.65,"longitude":-110.6},{"id":"iem_N_45.640_-110.550_1778703300000","source":"iem","severity":"low","severityValue":25,"timestamp":1778703300000,"latitude":45.64,"longitude":-110.55},{"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_45.700_-110.430_1778716380000","source":"iem","severity":"low","severityValue":25,"timestamp":1778716380000,"latitude":45.7,"longitude":-110.43},{"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_45.650_-110.600_1778709600000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709600000,"latitude":45.65,"longitude":-110.6},{"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_45.720_-110.250_1778717700000","source":"iem","severity":"low","severityValue":25,"timestamp":1778717700000,"latitude":45.72,"longitude":-110.25},{"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_1778716800000","source":"iem","severity":"low","severityValue":25,"timestamp":1778716800000,"latitude":45.69,"longitude":-110.5},{"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},{"id":"iem_G_45.700_-110.430_1778709180000","source":"iem","severity":"low","severityValue":25,"timestamp":1778709180000,"latitude":45.7,"longitude":-110.43}] |
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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