Right now
The most recent data we hold from NOAA arrived 1 minute 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 18 March 2026 at 12:45 UTC. It is kept here as a record.
It is one of only 3 we have recorded within 20 km of this point since 18 March 2026.
What the source measured
NOAA reported: Flood Warning issued March 17 at 9:45PM PDT by NWS Seattle WA
Urban PEI: 18,090 within a heuristic 50 km radius; not unique people.
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 48.0155, -121.3423 |
| Nearest City | Monroe (50 km) |
| Urban exposure index (PEI) | 18.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-18T12:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.54a068ebe26495b0b2c31b12a884e3cb |
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: 2026-03-18T12:55:00.000Z.
First archived: 2026-03-18T04:51:14.010Z. 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 | King, WA; Chelan, WA |
| Headline | Flood Warning issued March 17 at 9:45PM PDT by NWS Seattle WA |
| Expires | 2026-03-18T05:45:00-07:00 |
| SenderName | NWS Seattle WA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.54a068ebe26495b0b2c31b12a884e3cba16d2e86.001.1","noaa_urn:oid:2.49.0.1.840.0.f05ae8af7e82e571c3b7e3742e10c48945c4053e.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.
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