This alert expired on 15 March 2026 at 16:00 UTC. It is kept here as a record.
Another comparable one was recorded here earlier the same day. One more was recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued March 15 at 2:49AM HST until March 15 at 6:00AM HST by NWS Honolulu HI
Nearby, since 15 March 2026
- August 13, 2026 · score 34 · 17.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 22 out of 100, at 64 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 22 / 100 |
| Our confidence | 64% |
| Coordinates | 19.6290, -155.4467 |
| Nearest City | Hilo (39 km) |
| Impact Tier | minor |
| Timestamp | 2026-03-15T12:49:00.000Z |
| Source | https://api.weather.gov/alerts/urn-oid-2_49_0_1_840_0_ae2853e848a7d1fe92a20e92b248327209c8e8b3_001_1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Hawaii in Hawaii, HI |
| Headline | Flash Flood Warning issued March 15 at 2:49AM HST until March 15 at 6:00AM HST by NWS Honolulu HI |
| Expires | 2026-03-15T06:00:00-10:00 |
| SenderName | NWS Honolulu HI |
| HasExactCoords | true |
| Iem TypeSummary | N |
| Iem Magnitude | 110 |
| Iem Unit | MPH |
| Iem City | Mauna Kea Summit |
| Iem County | Hawaii |
| Iem State | HI |
| Iem Wfo | HFO |
| Iem Remark | Strong wind gusts reported. |
| MergedSources | [{"id":"iem_N_19.830_-155.470_1773574980000","source":"iem","severity":"low","severityValue":25,"timestamp":1773574980000,"latitude":19.83,"longitude":-155.47}] |
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 10 February 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.
Calamity.live data shows a weather event with CalamityScore 22/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.