Right now
The most recent data we hold from NOAA arrived 12 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 July 2026 at 10:30 UTC. It is kept here as a record.
It is the 5th strongest of the 74 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 1 at 5:05AM CDT until July 1 at 5:30AM CDT by NWS Sioux Falls SD
Nearby, since 15 March 2026
- September 2, 2026 · score 46 · 21.5 km
How we know
Confirmed by 16 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 71 % 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 | Medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 71% |
| Coordinates | 43.4662, -95.8138 |
| Nearest City | Sioux Falls (74 km) |
| Impact Tier | minor |
| Timestamp | 2026-07-01T10:05:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.699690c32f7e9ffcc02fe6962ab49987a01d1885.002.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Lyon, IA; Osceola, IA; Nobles, MN |
| Headline | Severe Thunderstorm Warning issued July 1 at 5:05AM CDT until July 1 at 5:30AM CDT by NWS Sioux Falls SD |
| Expires | 2026-07-01T05:30:00-05:00 |
| SenderName | NWS Sioux Falls SD |
| HasExactCoords | true |
| Iem TypeSummary | G |
| Iem Magnitude | 64 |
| Iem Unit | MPH |
| Iem City | 2 NE Maurice |
| Iem County | Sioux |
| Iem State | IA |
| Iem Wfo | FSD |
| Iem Remark | ASOS reported gust of 64 mph at 2:15 am CDT. |
| MergedSources | [{"id":"iem_G_43.020_-96.080_1782890760000","source":"iem","severity":"low","severityValue":25,"timestamp":1782890760000,"latitude":43.02,"longitude":-96.08},{"id":"iem_G_43.010_-96.330_1782891180000","source":"iem","severity":"low","severityValue":25,"timestamp":1782891180000,"latitude":43.01,"longitude":-96.33},{"id":"iem_G_43.070_-96.370_1782891000000","source":"iem","severity":"low","severityValue":25,"timestamp":1782891000000,"latitude":43.07,"longitude":-96.37},{"id":"iem_G_42.860_-96.090_1782890460000","source":"iem","severity":"low","severityValue":25,"timestamp":1782890460000,"latitude":42.86,"longitude":-96.09},{"id":"iem_G_43.060_-96.480_1782891360000","source":"iem","severity":"low","severityValue":25,"timestamp":1782891360000,"latitude":43.06,"longitude":-96.48},{"id":"iem_G_43.020_-96.090_1782891000000","source":"iem","severity":"low","severityValue":25,"timestamp":1782891000000,"latitude":43.02,"longitude":-96.09},{"id":"iem_G_43.060_-96.480_1782891420000","source":"iem","severity":"low","severityValue":25,"timestamp":1782891420000,"latitude":43.06,"longitude":-96.48},{"id":"iem_G_43.060_-96.180_1782890460000","source":"iem","severity":"low","severityValue":25,"timestamp":1782890460000,"latitude":43.06,"longitude":-96.18},{"id":"iem_G_42.980_-96.170_1782889980000","source":"iem","severity":"low","severityValue":25,"timestamp":1782889980000,"latitude":42.98,"longitude":-96.17},{"id":"iem_G_43.060_-96.470_1782891420000","source":"iem","severity":"low","severityValue":25,"timestamp":1782891420000,"latitude":43.06,"longitude":-96.47},{"id":"iem_G_43.070_-96.180_1782890580000","source":"iem","severity":"low","severityValue":25,"timestamp":1782890580000,"latitude":43.07,"longitude":-96.18},{"id":"iem_G_43.640_-96.530_1782894180000","source":"iem","severity":"low","severityValue":25,"timestamp":1782894180000,"latitude":43.64,"longitude":-96.53},{"id":"iem_G_43.000_-96.340_1782891120000","source":"iem","severity":"low","severityValue":25,"timestamp":1782891120000,"latitude":43,"longitude":-96.34},{"id":"iem_G_43.440_-96.400_1782893100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782893100000,"latitude":43.44,"longitude":-96.4},{"id":"iem_G_42.990_-96.160_1782890100000","source":"iem","severity":"low","severityValue":25,"timestamp":1782890100000,"latitude":42.99,"longitude":-96.16}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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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