Right now
The most recent data we hold from NOAA arrived 8 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 19 June 2026 at 03:45 UTC. It is kept here as a record.
No stronger detection stands among the 22 recorded within 20 km of this point since 3 April 2026 — 14 others scored the same. Another comparable one was recorded here earlier the same day. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 18 at 9:16PM MDT until June 18 at 9:45PM MDT by NWS Rapid City SD
Nearby, since 3 April 2026
- June 19, 2026 · score 22 · 10.8 km
How we know
7 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 | 0.70/1 |
| Coordinates | 45.0342, -101.3993 |
| Nearest City | Rapid City (180 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-06-19T03:16:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.09ef9bc3eb8d5d4471ae89e342b3e84f |
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: 2026-06-19T03:16:00.000Z.
First archived: 2026-06-19T03:38:43.495Z. 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 | Haakon, SD; Ziebach, SD; Dewey, SD; Stanley, SD |
| Headline | Severe Thunderstorm Warning issued June 18 at 9:16PM MDT until June 18 at 9:45PM MDT by NWS Rapid City SD |
| Expires | 2026-06-18T21:45:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.09ef9bc3eb8d5d4471ae89e342b3e84fc3b1a82e.002.1","noaa_urn:oid:2.49.0.1.840.0.3efcb4e102c42607c7e79cba8a88e658fcf6181d.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 50 |
| Iem Unit | mph |
| Iem City | 1 WSW Red Elm |
| Iem County | Ziebach |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_45.210_-102.160_1781836740000","source":"iem","severity":"low","severityValue":25,"timestamp":1781836740000,"latitude":45.21,"longitude":-102.16},{"id":"iem_G_45.050_-101.800_1781837640000","source":"iem","severity":"low","severityValue":25,"timestamp":1781837640000,"latitude":45.05,"longitude":-101.8},{"id":"iem_G_45.210_-102.160_1781836140000","source":"iem","severity":"low","severityValue":25,"timestamp":1781836140000,"latitude":45.21,"longitude":-102.16},{"id":"iem_G_45.050_-101.800_1781837940000","source":"iem","severity":"low","severityValue":25,"timestamp":1781837940000,"latitude":45.05,"longitude":-101.8},{"id":"iem_G_45.040_-102.020_1781836920000","source":"iem","severity":"low","severityValue":25,"timestamp":1781836920000,"latitude":45.04,"longitude":-102.02},{"id":"iem_G_45.050_-101.800_1781838540000","source":"iem","severity":"low","severityValue":25,"timestamp":1781838540000,"latitude":45.05,"longitude":-101.8}] |
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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