Right now
The most recent data we hold from NOAA arrived 17 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 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. 14 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued May 31 at 9:43PM CDT until June 1 at 9:45AM CDT by NWS Aberdeen SD
An estimated 28,102 people live within 50 km of this point.
Nearby, since 8 April 2026
- June 1, 2026 · score 40 · 0.0 km
- May 31, 2026 · score 40 · 15.0 km
How we know
Confirmed by 16 independent sources, including NOAA.
Our own score for this event is 40 out of 100, at 89 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
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 |
| Our confidence | 89% |
| Coordinates | 45.7800, -98.8492 |
| Nearest City | Aberdeen (45 km) |
| Population Exposed | 28.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-01T02:43:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.f776e13755a4a1db3a500e2e51d909528ce5c103.001.1 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | McPherson, SD |
| Headline | Flood Warning issued May 31 at 9:43PM 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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