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 19 March 2026 at 01:45 UTC. It is kept here as a record.
No stronger detection stands among the 65 recorded within 20 km of this point since 18 March 2026 — 39 others scored the same. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued March 18 at 10:38AM PDT by NWS Seattle WA
An estimated 1,147,403 people live within 50 km of this point.
Nearby, since 18 March 2026
- March 22, 2026 · score 52 · 1.7 km
- March 19, 2026 · score 52 · 3.3 km
- March 20, 2026 · score 52 · 3.4 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 80 % 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) | 52 / 100 |
| Our confidence | 80% |
| Coordinates | 47.8314, -121.7019 |
| Nearest City | Monroe (20 km) |
| Population Exposed | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-18T23:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.2ebd977c1253b8527408543223ea010c |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Snohomish, WA; King, WA; Chelan, WA |
| Headline | Flood Warning issued March 18 at 10:38AM PDT by NWS Seattle WA |
| Expires | 2026-03-18T18:45:00-07:00 |
| SenderName | NWS Seattle WA |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.2ebd977c1253b8527408543223ea010ca4a28c7a.001.1","noaa_urn:oid:2.49.0.1.840.0.7c29004e34c701b399e68b837b102d4b4bd1b420.001.1","noaa_urn:oid:2.49.0.1.840.0.7c057421ee6b56479c923d14781cf1a5b8c1d4d1.001.1","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 near Monroe?
Calamity.live data shows a weather event with CalamityScore 52/100, near Monroe (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.