Right now
The most recent data we hold from NOAA arrived 3 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 August 2026 at 01:30 UTC. It is kept here as a record.
No stronger detection stands among the 29 recorded within 20 km of this point since 15 March 2026 — 3 others scored the same. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued July 31 at 9:10AM CDT until August 1 at 2:00PM CDT by NWS Aberdeen SD
Nearby, since 15 March 2026
- July 30, 2026 · score 22 · 15.0 km
How we know
12 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 | 0.72/1 |
| Coordinates | 45.6133, -96.8683 |
| Nearest City | Watertown (82 km) |
| Urban exposure index (PEI) | 0 within 50 km |
| Impact Tier | minor |
| Timestamp | 2026-07-31T14:33:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.a92ec9fbd7dbaf71657a458c95645fd54d31fb5f.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: 2026-07-31T14:33:00.000Z.
First archived: 2026-07-31T18:33:34.179Z. 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 | Roberts, SD |
| Headline | Flood Warning issued July 31 at 9:10AM CDT until August 1 at 2:00PM CDT by NWS Aberdeen SD |
| Expires | 2026-07-31T20:30:00-05:00 |
| SenderName | NWS Aberdeen SD |
| HasExactCoords | true |
| Iem TypeSummary | R |
| Iem Magnitude | 1.89 |
| Iem Unit | Inch |
| Iem City | Webster |
| Iem County | Day |
| Iem State | SD |
| Iem Wfo | ABR |
| Iem Remark | 24 hour rainfall total. |
| MergedSources | [{"id":"iem_R_46.060_-96.720_1785514740000","source":"iem","severity":"low","severityValue":25,"timestamp":1785514740000,"latitude":46.06,"longitude":-96.72},{"id":"iem_R_45.810_-96.240_1785514920000","source":"iem","severity":"low","severityValue":25,"timestamp":1785514920000,"latitude":45.81,"longitude":-96.24},{"id":"iem_R_44.980_-97.080_1785492000000","source":"iem","severity":"low","severityValue":25,"timestamp":1785492000000,"latitude":44.98,"longitude":-97.08},{"id":"iem_R_45.810_-96.500_1785502800000","source":"iem","severity":"low","severityValue":25,"timestamp":1785502800000,"latitude":45.81,"longitude":-96.5},{"id":"iem_R_45.310_-97.060_1785499200000","source":"iem","severity":"low","severityValue":25,"timestamp":1785499200000,"latitude":45.31,"longitude":-97.06},{"id":"iem_R_45.410_-96.860_1785502800000","source":"iem","severity":"low","severityValue":25,"timestamp":1785502800000,"latitude":45.41,"longitude":-96.86},{"id":"iem_R_45.600_-96.350_1785495600000","source":"iem","severity":"low","severityValue":25,"timestamp":1785495600000,"latitude":45.6,"longitude":-96.35},{"id":"iem_R_45.450_-96.860_1785503400000","source":"iem","severity":"low","severityValue":25,"timestamp":1785503400000,"latitude":45.45,"longitude":-96.86},{"id":"iem_R_45.470_-97.390_1785502920000","source":"iem","severity":"low","severityValue":25,"timestamp":1785502920000,"latitude":45.47,"longitude":-97.39},{"id":"iem_R_45.400_-97.310_1785491520000","source":"iem","severity":"low","severityValue":25,"timestamp":1785491520000,"latitude":45.4,"longitude":-97.31},{"id":"iem_R_45.340_-97.520_1785502800000","source":"iem","severity":"low","severityValue":25,"timestamp":1785502800000,"latitude":45.34,"longitude":-97.52}] |
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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