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.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 1 June 2026 at 14:45 UTC. It is kept here as a record.
No stronger detection stands among the 32 recorded within 20 km of this point since 8 April 2026 — 11 others scored the same. Another comparable one was recorded here earlier the same day. 15 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued May 31 at 10:28PM CDT until June 1 at 9:45AM CDT by NWS Aberdeen SD
Urban PEI: 28,102 within a heuristic 50 km radius; not unique people.
Nearby, since 8 April 2026
- June 1, 2026 · score 40 · 0.0 km
- May 31, 2026 · score 40 · 15.0 km
How we know
16 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 40 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 | High |
| Calamity Score (ours) | 40 / 100 |
| Legacy data-support index | 0.90/1 |
| Coordinates | 45.7800, -98.8492 |
| Nearest City | Aberdeen (45 km) |
| Urban exposure index (PEI) | 28.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T03:28:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.536d038cebbe9302c4c33a9bda544f7c8ea5a795.001.1 |
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: 2026-06-01T03:28:00.000Z.
First archived: 2026-06-01T10:27:36.417Z. 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 | Immediate |
| Certainty | Likely |
| AreaDesc | McPherson, SD |
| Headline | Flood Warning issued May 31 at 10:28PM CDT until June 1 at 9:45AM CDT by NWS Aberdeen SD |
| Expires | 2026-06-01T09:45:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Spc ReportType | hail |
| Spc Speed | 100 |
| Spc Location | Leola |
| Spc County | McPherson |
| Spc State | SD |
| Spc Comments | (ABR) |
| Iem TypeSummary | F |
| Iem City | Leola |
| Iem County | McPherson |
| Iem State | SD |
| Iem Wfo | ABR |
| Iem Remark | Reports include 3.5 inches of rain in less than an hour. Most roads in Leola are flooded with Highway 10 on the east side of town has had 4-5 inches of water covering the roadway. |
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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