Right now
The most recent data we hold from NOAA arrived 5 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 30 July 2026 at 22:45 UTC. It is kept here as a record.
It is the 9th strongest of the 74 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 30 at 3:52PM MDT until July 30 at 4:45PM MDT by NWS Rapid City SD
Nearby, since 17 March 2026
- June 4, 2026 · score 22 · 15.4 km
How we know
4 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 | 45.6825, -103.1399 |
| Nearest City | Dickinson (136 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-30T21:52:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.5c14b32cb5e6e95f73ab1d6be7304699 |
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: 2026-07-30T21:52:00.000Z.
First archived: 2026-07-30T21:58:56.923Z. 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 | Harding, SD; Perkins, SD; Harding, SD |
| Headline | Severe Thunderstorm Warning issued July 30 at 3:52PM MDT until July 30 at 4:45PM MDT by NWS Rapid City SD |
| Expires | 2026-07-30T16:45:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5c14b32cb5e6e95f73ab1d6be730469901a5a494.001.1","noaa_urn:oid:2.49.0.1.840.0.82a8ba69aad4df97bbacd1d0d1d9c77b51862d55.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 52 |
| Iem Unit | mph |
| Iem City | 10 W Reva |
| Iem County | Harding |
| Iem State | SD |
| Iem Wfo | UNR |
| MergedSources | [{"id":"iem_G_45.600_-103.550_1785444240000","source":"iem","severity":"low","severityValue":25,"timestamp":1785444240000,"latitude":45.6,"longitude":-103.55},{"id":"iem_G_45.830_-103.370_1785447000000","source":"iem","severity":"low","severityValue":25,"timestamp":1785447000000,"latitude":45.83,"longitude":-103.37},{"id":"iem_G_45.520_-103.290_1785446700000","source":"iem","severity":"low","severityValue":25,"timestamp":1785446700000,"latitude":45.52,"longitude":-103.29}] |
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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