Right now
The most recent data we hold from NOAA arrived 13 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 5 July 2026 at 06:00 UTC. It is kept here as a record.
It is the 30th strongest of the 184 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 4 July 2026. 57 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued July 4 at 7:03PM CDT until July 5 at 1:00AM CDT by NWS Aberdeen SD
Nearby, since 15 March 2026
- July 5, 2026 · score 22 · 0.0 km
- August 31, 2026 · score 22 · 6.8 km
- August 27, 2026 · score 22 · 6.8 km
How we know
2 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 | 0.65/1 |
| Coordinates | 43.8415, -99.3738 |
| Nearest City | Mitchell (109 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-05T00:03:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.8ce421114e63dbbefde38be7bdfcbbf216f998f9.001.1 |
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: 2026-07-05T00:03:00.000Z.
First archived: 2026-07-05T01:39:13.432Z. 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 | Lyman, SD |
| Headline | Flood Warning issued July 4 at 7:03PM CDT until July 5 at 1:00AM CDT by NWS Aberdeen SD |
| Expires | 2026-07-05T01:00:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1.25 |
| Iem Unit | Inch |
| Iem City | 3 NE Oacoma |
| Iem County | Lyman |
| Iem State | SD |
| Iem Wfo | ABR |
| Iem Remark | mainly dime and nickel size hail with some larger hailstones thrown in. |
| MergedSources | [{"id":"iem_H_43.830_-99.340_1783208220000","source":"iem","severity":"low","severityValue":25,"timestamp":1783208220000,"latitude":43.83,"longitude":-99.34}] |
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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