Right now
The most recent data we hold from NOAA arrived 1 minute ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
2 other detections within 20 km in the last 24 hours, the nearest 15 km from here.
This alert expired on 3 July 2026 at 18:45 UTC. It is kept here as a record.
No stronger detection stands among the 33 recorded within 20 km of this point since 15 March 2026 — 2 others scored the same. 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 3 at 12:20PM MDT until July 3 at 12:45PM MDT by NWS Rapid City SD
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 | 0.69/1 |
| Coordinates | 44.1280, -103.8860 |
| Nearest City | Rapid City (53 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-03T18:20:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.833104dc29948c79b85d4aa24cdbc816aba63051.001.1 |
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: 2026-07-03T18:20:00.000Z.
First archived: 2026-07-03T18:45:09.838Z. 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 | Lawrence, SD; Pennington, SD |
| Headline | Severe Thunderstorm Warning issued July 3 at 12:20PM MDT until July 3 at 12:45PM MDT by NWS Rapid City SD |
| Expires | 2026-07-03T12:45:00-06:00 |
| SenderName | NWS Rapid City SD |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | inch |
| Iem City | Dwtn Spearfish |
| Iem County | Lawrence |
| Iem State | SD |
| Iem Wfo | UNR |
| Iem Remark | Reported on the northwest side of Spearfish |
| MergedSources | [{"id":"iem_R_44.240_-103.250_1783083600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783083600000,"latitude":44.24,"longitude":-103.25},{"id":"iem_H_44.510_-103.860_1783098600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783098600000,"latitude":44.51,"longitude":-103.86},{"id":"iem_H_44.510_-103.890_1783098180000","source":"iem","severity":"low","severityValue":25,"timestamp":1783098180000,"latitude":44.51,"longitude":-103.89},{"id":"iem_H_44.490_-103.860_1783098780000","source":"iem","severity":"low","severityValue":25,"timestamp":1783098780000,"latitude":44.49,"longitude":-103.86},{"id":"iem_R_44.290_-103.150_1783083600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783083600000,"latitude":44.29,"longitude":-103.15},{"id":"iem_H_44.500_-103.860_1783098360000","source":"iem","severity":"low","severityValue":25,"timestamp":1783098360000,"latitude":44.5,"longitude":-103.86}] |
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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