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.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 18 March 2026 at 20:45 UTC. It is kept here as a record.
It is the 47th strongest of the 54 detections recorded within 20 km of this point since 18 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued March 18 at 5:36AM PDT until March 21 at 11:35AM PDT by NWS Seattle WA
An estimated 230,246 people live within 50 km of this point.
Nearby, since 18 March 2026
- March 18, 2026 · score 52 · 15.3 km
- March 22, 2026 · score 52 · 17.1 km
- March 20, 2026 · score 52 · 17.4 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, at 81 % 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) | 43 / 100 |
| Our confidence | 81% |
| Coordinates | 47.8518, -121.4986 |
| Nearest City | Monroe (35 km) |
| Population Exposed | 230.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-18T22:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.751262da14425b1ac5bd01920417477e |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | King, WA; Chelan, WA |
| Headline | Flood Warning issued March 18 at 5:36AM PDT until March 21 at 11:35AM PDT by NWS Seattle WA |
| Expires | 2026-03-18T13:45:00-07:00 |
| SenderName | NWS Seattle WA |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.751262da14425b1ac5bd01920417477e02e7c56d.001.1","noaa_urn:oid:2.49.0.1.840.0.2f01abbfde3c61d07640f32299daf53d8e518d00.001.1","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.
Want to know when something happens in this area?
Calamity.live data shows a weather event with CalamityScore 43/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.