Right now
The most recent data we hold from NOAA arrived 19 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 12:00 UTC. It is kept here as a record.
No stronger detection stands among the 62 recorded within 20 km of this point since 18 March 2026 — 36 others scored the same. The last comparable one was on 21 March 2026. 61 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued March 20 at 8:47PM PDT until March 22 at 6:00AM PDT by NWS Seattle WA
Urban PEI: 1,147,403 within a heuristic 50 km radius; not unique people.
Nearby, since 18 March 2026
- March 22, 2026 · score 52 · 4.1 km
- March 18, 2026 · score 52 · 4.2 km
- March 19, 2026 · score 52 · 5.5 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 | 0.82/1 |
| Coordinates | 47.7938, -121.7051 |
| Nearest City | Monroe (21 km) |
| Urban exposure index (PEI) | 1.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-22T05:11:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flood Warning_noaa_urn:oid:2.49.0.1.840.0.5d8f53787b9f7d28225d56dd31bfab0e |
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: 2026-03-22T05:11:00.000Z.
First archived: 2026-03-22T17:40:00.316Z. 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 | Whatcom, WA; Snohomish, WA; King, WA and 6 more areas |
| Headline | Flood Warning issued March 20 at 8:47PM PDT until March 22 at 6:00AM PDT by NWS Seattle WA |
| Expires | 2026-03-21T05:00:00-07:00 |
| SenderName | NWS Seattle WA |
| HasExactCoords | true |
| MergedCount | 21 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.5d8f53787b9f7d28225d56dd31bfab0eaed346fd.001.1","noaa_urn:oid:2.49.0.1.840.0.c62a17e15bf06772e6836eb24f31795cfc3e2272.001.1","noaa_urn:oid:2.49.0.1.840.0.4c8fe7b8e40b316606a0c5171756800c3586a331.001.1","noaa_urn:oid:2.49.0.1.840.0.323085047ee4830aa6eaf2f07e1675253c688b39.001.1","noaa_urn:oid:2.49.0.1.840.0.410a7dfe8785f6728df38bc46a8729c0fc21d447.001.1","noaa_urn:oid:2.49.0.1.840.0.410a7dfe8785f6728df38bc46a8729c0fc21d447.002.1","noaa_urn:oid:2.49.0.1.840.0.f7ada30f0c5fa85b6e995f908cd94028c66d7fd9.001.1","noaa_urn:oid:2.49.0.1.840.0.6a3307b113e3c2cc63846b159d27c13a2c50163e.001.1","noaa_urn:oid:2.49.0.1.840.0.0fe0cff67a01b6a855d009665c1220f0b82c771b.001.1","noaa_urn:oid:2.49.0.1.840.0.cbcac006c2790f27652c95d4aefd1f676036ea39.001.1","noaa_urn:oid:2.49.0.1.840.0.d8721016334c1414936744368f5fe28eda3fac07.001.1","noaa_urn:oid:2.49.0.1.840.0.f63ca6cef532e9174e9286ce9f069d077432812f.001.1","noaa_urn:oid:2.49.0.1.840.0.218df80c14b02235b83efe51e1d014d1a89bd49f.001.1","noaa_urn:oid:2.49.0.1.840.0.f0704001fbb4edb6aa81b790e93f6505ad2bca34.001.1","noaa_urn:oid:2.49.0.1.840.0.c2a5a2f9963b9e73839cddaf57df8d0541a955f2.001.1","noaa_urn:oid:2.49.0.1.840.0.8e56ab13b6f04de9bfe4a0023b1d60e5b1665b39.001.1","noaa_urn:oid:2.49.0.1.840.0.8e56ab13b6f04de9bfe4a0023b1d60e5b1665b39.003.1","noaa_urn:oid:2.49.0.1.840.0.8e56ab13b6f04de9bfe4a0023b1d60e5b1665b39.002.1","noaa_urn:oid:2.49.0.1.840.0.d390d102c63a26a2f9709d6a9df0387fbb0f36ec.001.1","noaa_urn:oid:2.49.0.1.840.0.29d289eccd1442b1fd40652ffce0480bdd557341.001.1","noaa_urn:oid:2.49.0.1.840.0.90e27ddc7cf5e961243c4d1de1b82162b013fbaf.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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