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.
20 other detections within 20 km in the last 24 hours, the nearest 10 km from here.
This alert expired on 21 March 2026 at 23:15 UTC. It is kept here as a record.
It is the 2nd strongest of the 84 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 35 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued March 20 at 1:05PM HST until March 21 at 1:15PM HST by NWS Honolulu HI
Nearby, since 12 March 2026
- March 21, 2026 · score 22 · 0.0 km
- March 20, 2026 · score 22 · 0.0 km
- May 16, 2026 · score 22 · 3.3 km
How we know
Confirmed by 7 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 71 % 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) | 22 / 100 |
| Our confidence | 71% |
| Coordinates | 21.4980, -158.0192 |
| Nearest City | Wahiawā (0 km) |
| Impact Tier | minor |
| Timestamp | 2026-03-20T23:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.740b531802dc2e17b6e390de65328397 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Oahu in Honolulu, HI |
| Headline | Flash Flood Warning issued March 20 at 1:05PM HST until March 21 at 1:15PM HST by NWS Honolulu HI |
| Expires | 2026-03-21T13:15:00-10:00 |
| SenderName | NWS Honolulu HI |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.740b531802dc2e17b6e390de65328397bf961df3.001.1","noaa_urn:oid:2.49.0.1.840.0.18311ae27ba6e85e79f18751710bc412d00a552b.001.1","noaa_urn:oid:2.49.0.1.840.0.c3693fedb37720544ece4345babfe63529675548.001.1"] |
| Iem TypeSummary | F |
| Iem City | 1 E Waialua |
| Iem County | Honolulu |
| Iem State | HI |
| Iem Wfo | HFO |
| Iem Remark | Foot of flowing water on roadway, several cars and homes inundated along the road, and civilians had to be rescued and transported on a bulldozer. |
| MergedSources | [{"id":"iem_R_21.650_-157.930_1774028100000","source":"iem","severity":"low","severityValue":25,"timestamp":1774028100000,"latitude":21.65,"longitude":-157.93},{"id":"iem_R_21.600_-158.020_1774027800000","source":"iem","severity":"low","severityValue":25,"timestamp":1774027800000,"latitude":21.6,"longitude":-158.02},{"id":"iem_R_21.570_-158.260_1774028160000","source":"iem","severity":"low","severityValue":25,"timestamp":1774028160000,"latitude":21.57,"longitude":-158.26},{"id":"iem_R_21.580_-158.160_1774028160000","source":"iem","severity":"low","severityValue":25,"timestamp":1774028160000,"latitude":21.58,"longitude":-158.16},{"id":"iem_R_21.620_-158.010_1774027800000","source":"iem","severity":"low","severityValue":25,"timestamp":1774027800000,"latitude":21.62,"longitude":-158.01},{"id":"iem_F_21.580_-158.120_1774031040000","source":"iem","severity":"low","severityValue":25,"timestamp":1774031040000,"latitude":21.58,"longitude":-158.12}] |
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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