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 21 March 2026 at 01:00 UTC. It is kept here as a record.
No stronger detection stands among the 54 recorded within 20 km of this point since 18 March 2026 — 39 others scored the same. The last comparable one was on 20 March 2026. 40 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued March 20 at 9:48AM PDT until March 22 at 4:17AM PDT by NWS Seattle WA
Urban PEI: 1,182,685 within a heuristic 50 km radius; not unique people.
Nearby, since 18 March 2026
- March 21, 2026 · score 52 · 8.7 km
- March 21, 2026 · score 52 · 10.5 km
- March 20, 2026 · score 52 · 12.9 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.
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) | 52 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 47.9504, -121.8290 |
| Nearest City | Monroe (15 km) |
| Urban exposure index (PEI) | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-21T06:00:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.52c13597362e3eee822d9029cb46fa08 |
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: 2026-03-21T06:00:00.000Z.
First archived: 2026-03-20T17:06:53.632Z. 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 | King, WA; Skagit, WA; Chelan, WA and 2 more areas |
| Headline | Flood Warning issued March 20 at 9:48AM PDT until March 22 at 4:17AM PDT by NWS Seattle WA |
| Expires | 2026-03-20T18:00:00-07:00 |
| SenderName | NWS Seattle WA |
| HasExactCoords | true |
| MergedCount | 13 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.52c13597362e3eee822d9029cb46fa080787b619.001.1","noaa_urn:oid:2.49.0.1.840.0.af143bcc4bb3a9c53aa7c4dd660c9f3bb0f592e4.001.1","noaa_urn:oid:2.49.0.1.840.0.5c4a238819439134240b39eea1383cc190fe9482.001.1","noaa_urn:oid:2.49.0.1.840.0.1494865752fe4badd66e4cd085efd94b05ad3e67.001.1","noaa_urn:oid:2.49.0.1.840.0.1874952322b8e340839611edcc02306c057b40bd.001.1","noaa_urn:oid:2.49.0.1.840.0.fdb55f3bd0db541e7d4449a215c89fc00f23c4a0.001.1","noaa_urn:oid:2.49.0.1.840.0.14453d306d9c152006cd12a990aaa5b4708e52d6.001.1","noaa_urn:oid:2.49.0.1.840.0.3998e1bde72ce2fd692a9b5d8941e4d14ae1244a.001.1","noaa_urn:oid:2.49.0.1.840.0.c1a90df29c34bf19cb55ce20b9a29d30ac723875.001.1","noaa_urn:oid:2.49.0.1.840.0.1c60ea5c9c5472936c1b7c1c92bedd40a580d9cb.001.1","noaa_urn:oid:2.49.0.1.840.0.6bb655e42ccbd49b193e1dc17e8eef0f58c59185.001.1","noaa_urn:oid:2.49.0.1.840.0.b362aebc27483e1623115fc365c23f233d4b23e9.001.1","noaa_urn:oid:2.49.0.1.840.0.099ca6dc3e7338ac94524aa7e4e2660eb8929cfa.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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