Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
This alert expired on 2 July 2026 at 21:03 UTC. It is kept here as a record.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 2 at 3:53PM CDT until July 2 at 4:00PM CDT by NWS Aberdeen 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 | 0.68/1 |
| Coordinates | 44.0846, -99.0908 |
| Nearest City | Mitchell (95 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-02T20:53:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.d27f8bbb04783ee780e85303ea1e04af |
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: 2026-07-02T20:53:00.000Z.
First archived: 2026-07-02T20:57:05.086Z. 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 | Buffalo, SD; Lyman, SD; Hand, SD; Lyman, SD and 3 more areas |
| Headline | Severe Thunderstorm Warning issued July 2 at 3:53PM CDT until July 2 at 4:00PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-02T16:03:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d27f8bbb04783ee780e85303ea1e04af89d25006.001.1","noaa_urn:oid:2.49.0.1.840.0.513e7532ddcfea91ed1fe44c44a11e72723a7525.001.1","noaa_urn:oid:2.49.0.1.840.0.311f8d5c3ce02e9eba9853ecd2552df27e3f33be.001.1","noaa_urn:oid:2.49.0.1.840.0.599000a0f36d58b9f3ce840c6bfd5e7fbb720bd2.001.1","noaa_urn:oid:2.49.0.1.840.0.c3fb12fb6a9a0c1dd04b917653c1df7f8c1c4838.001.1","noaa_urn:oid:2.49.0.1.840.0.e6bdeff466b767bbb1ed6384ade2ba0f6d36e559.001.1","noaa_urn:oid:2.49.0.1.840.0.f87acd34384ede0cb3988534d5091b907cc2bc14.001.1"] |
| Iem TypeSummary | H |
| Iem Magnitude | 1.75 |
| Iem Unit | Inch |
| Iem City | 7 SSW Gann Valley |
| Iem County | Buffalo |
| Iem State | SD |
| Iem Wfo | ABR |
| MergedSources | [{"id":"iem_H_43.920_-99.120_1783019400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783019400000,"latitude":43.92,"longitude":-99.12},{"id":"iem_H_43.940_-99.040_1783020600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783020600000,"latitude":43.94,"longitude":-99.04},{"id":"iem_T_43.950_-98.990_1783022160000","source":"iem","severity":"low","severityValue":25,"timestamp":1783022160000,"latitude":43.95,"longitude":-98.99},{"id":"iem_T_44.030_-98.950_1783023000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783023000000,"latitude":44.03,"longitude":-98.95},{"id":"iem_H_43.920_-99.120_1783018560000","source":"iem","severity":"low","severityValue":25,"timestamp":1783018560000,"latitude":43.92,"longitude":-99.12},{"id":"iem_H_43.950_-99.050_1783019700000","source":"iem","severity":"low","severityValue":25,"timestamp":1783019700000,"latitude":43.95,"longitude":-99.05}] |
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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