Right now
The most recent data we hold from NOAA arrived 4 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 17 March 2026 at 17:45 UTC. It is kept here as a record.
No stronger detection stands among the 29 recorded within 20 km of this point since 17 March 2026 — 7 others scored the same. 3 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued March 16 at 11:45AM EDT until March 22 at 8:00PM EDT by NWS Grand Rapids MI
Urban PEI: 260,602 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- September 3, 2026 · score 37 · 5.7 km
- September 4, 2026 · score 37 · 8.7 km
- July 3, 2026 · score 43 · 12.3 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 43 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) | 43 / 100 |
| Legacy data-support index | 0.78/1 |
| Coordinates | 42.5397, -85.0127 |
| Nearest City | Battle Creek (28 km) |
| Urban exposure index (PEI) | 260.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T06:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.d265396c7fa26109e8cbe1c1c4fde7e4 |
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: 2026-03-17T06:00:00.000Z.
First archived: 2026-03-17T01:49:23.530Z. 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 | Observed |
| AreaDesc | Clinton, MI; Newaygo, MI; Kent, MI and 4 more areas |
| Headline | Flood Warning issued March 16 at 11:45AM EDT until March 22 at 8:00PM EDT by NWS Grand Rapids MI |
| Expires | 2026-03-17T13:45:00-04:00 |
| SenderName | NWS Grand Rapids MI |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d265396c7fa26109e8cbe1c1c4fde7e4fb712607.001.1","noaa_urn:oid:2.49.0.1.840.0.c16c88b4633a111a0762b8e5aa3732e15b0f5754.002.1","noaa_urn:oid:2.49.0.1.840.0.c16c88b4633a111a0762b8e5aa3732e15b0f5754.001.1","noaa_urn:oid:2.49.0.1.840.0.fbbb8e1a023b55d2485fb42d6e67c5f3daa5a4c4.001.1","noaa_urn:oid:2.49.0.1.840.0.685632b81b5d6efacd5b7c1920698c88eed0ad1f.003.1","noaa_urn:oid:2.49.0.1.840.0.685632b81b5d6efacd5b7c1920698c88eed0ad1f.002.1","noaa_urn:oid:2.49.0.1.840.0.685632b81b5d6efacd5b7c1920698c88eed0ad1f.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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