Calamity
MediumSevere WeatherCalamity Score: 16

Severe Weather in United States

Otter TailUnited StatesNOAA

Right now

The most recent data we hold from NOAA arrived 6 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.

5 other detections within 20 km in the last 24 hours, the nearest <1 km from here.

This alert expired on 7 September 2026 at 05:30 UTC. It is kept here as a record.

It is the 64th strongest of the 135 detections recorded within 20 km of this point since 15 March 2026. The last comparable one was on 6 September 2026.

What the source measured

NOAA reported: Flash Flood Warning issued September 6 at 10:21PM CDT until September 7 at 12:30AM CDT by NWS Grand Forks ND

Nearby, since 15 March 2026

How we know

Confirmed by 2 independent sources, including NOAA.

Our own score for this event is 16 out of 100, at 66 % confidence.

The score is ours, computed from intensity, exposed population and local history — not the source’s.

Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.

Event Data

TypeSevere Weather
SeverityMedium
Calamity Score (ours)16 / 100
Our confidence66%
Coordinates46.3950, -95.7010
Nearest CityMoorhead (97 km)
Impact Tierminor
Timestamp2026-09-07T03:21:00.000Z
Sourcehttps://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.10364620acf639d63df5cd8009ce4a52bf0c577b.001.1

Score Breakdown

35
intensity
0
population
0
cascading
18
historical

Technical Details

EventFlash Flood Warning
UrgencyImmediate
CertaintyLikely
AreaDescOtter Tail, MN
HeadlineFlash Flood Warning issued September 6 at 10:21PM CDT until September 7 at 12:30AM CDT by NWS Grand Forks ND
Expires2026-09-07T00:30:00-05:00
SenderNameNWS Grand Forks ND
HasExactCoordstrue
MergedCount2
MergedIds["noaa_urn:oid:2.49.0.1.840.0.10364620acf639d63df5cd8009ce4a52bf0c577b.001.1","noaa_urn:oid:2.49.0.1.840.0.7fe786b3669b27514675bac07c7b04bfc4e26e28.001.1"]
Iem TypeSummaryF
Iem CityFergus Falls
Iem CountyOtter Tail
Iem StateMN
Iem WfoFGF
Iem RemarkMedia relayed a video of 2 kids wading their bikes through an estimated (waist deep) 3 feet of water in Dr Allen Magnuson Park. Estimated time of flooding onset is 6:10pm to 6:40pm based on MRMS.
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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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Calamity.live data shows a weather event with CalamityScore 16/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.