Right now
The most recent data we hold from NOAA arrived 11 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 09:00 UTC. It is kept here as a record.
No stronger detection stands among the 64 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. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued March 18 at 5:58PM PDT until March 22 at 10:39AM PDT by NWS Seattle WA
Urban PEI: 1,207,727 within a heuristic 50 km radius; not unique people.
Nearby, since 18 March 2026
- March 19, 2026 · score 52 · 0.0 km
- March 22, 2026 · score 52 · 1.7 km
- March 20, 2026 · score 52 · 2.3 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 | 47.8354, -121.7453 |
| Nearest City | Monroe (17 km) |
| Urban exposure index (PEI) | 1.2M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-19T00:58:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.a72a936bd6e2b3f3aa25b3ac28282b77 |
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: 2026-03-19T00:58:00.000Z.
First archived: 2026-03-19T02:45:24.096Z. 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 | Snohomish, WA; King, WA; Chelan, WA |
| Headline | Flood Warning issued March 18 at 5:58PM PDT until March 22 at 10:39AM PDT by NWS Seattle WA |
| Expires | 2026-03-19T02:00:00-07:00 |
| SenderName | NWS Seattle WA |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.a72a936bd6e2b3f3aa25b3ac28282b77b86dfec8.001.1","noaa_urn:oid:2.49.0.1.840.0.aec2f3d504306c5d2cfa72f1f4520d42ad999460.001.1","noaa_urn:oid:2.49.0.1.840.0.473c4a77b329449c8745ae7c12f2f7795964e537.001.1","noaa_urn:oid:2.49.0.1.840.0.59d4856c9bab072f459cf80f3bdaa20e9f562598.001.1","noaa_urn:oid:2.49.0.1.840.0.5b841ec2efa434ec47c1497d9dab22a4ec8e7503.001.1","noaa_urn:oid:2.49.0.1.840.0.46dd47b7c0af92992a49d912626f01f36b29db95.001.1","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.
Review the area, threshold and delivery channel in your account.
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