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.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 30 July 2026 at 23:15 UTC. It is kept here as a record.
It is the 33rd strongest of the 75 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 26 July 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued July 30 at 3:22PM CDT until July 30 at 6:15PM CDT by NWS Aberdeen SD
Nearby, since 15 March 2026
- June 29, 2026 · score 58 · 12.1 km
- July 8, 2026 · score 34 · 13.1 km
How we know
3 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 | 45.4950, -97.7433 |
| Nearest City | Aberdeen (58 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-30T20:22:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.5af5b1d9afeb55889a616cd74f21b62e26479da9.001.1 |
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: 2026-07-30T20:22:00.000Z.
First archived: 2026-07-30T22:36:17.600Z. 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 | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Day, SD |
| Headline | Flood Warning issued July 30 at 3:22PM CDT until July 30 at 6:15PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-30T18:15:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 5 |
| Iem Unit | Inch |
| Iem City | 2 SE Roslyn |
| Iem County | Day |
| Iem State | SD |
| Iem Wfo | ABR |
| MergedSources | [{"id":"iem_R_45.500_-97.830_1785446580000","source":"iem","severity":"low","severityValue":25,"timestamp":1785446580000,"latitude":45.5,"longitude":-97.83},{"id":"iem_R_45.480_-97.460_1785446400000","source":"iem","severity":"low","severityValue":25,"timestamp":1785446400000,"latitude":45.48,"longitude":-97.46}] |
Safety Information
During flooding: never walk, swim, or drive through floodwaters. Six inches of moving water can knock you down, and one foot of water can sweep away a vehicle. Move to higher ground if waters rise. After flooding, avoid contact with floodwater which may contain sewage, chemicals, or debris. Follow local emergency service guidance.
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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