Right now
The most recent data we hold from NOAA arrived 10 minutes ago, and this point is in it.
One other detection within 20 km in the last 24 hours, <1 km from here.
This alert expired on 10 September 2026 at 09:30 UTC. It is kept here as a record.
It is the 13th strongest of the 20 detections recorded within 20 km of this point since 14 March 2026. 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 September 9 at 10:18PM HST until September 9 at 11:30PM HST by NWS Honolulu HI
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 16 out of 100, at 66 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 66% |
| Coordinates | 19.2516, -155.3532 |
| Nearest City | Hilo (60 km) |
| Impact Tier | minor |
| Timestamp | 2026-09-10T08:18:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.2239f9e8a864707e09aeca0a7c52d6fa77d5a16a.001.1 |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Hawaii in Hawaii, HI |
| Headline | Flash Flood Warning issued September 9 at 10:18PM HST until September 9 at 11:30PM HST by NWS Honolulu HI |
| Expires | 2026-09-09T23:30:00-10:00 |
| SenderName | NWS Honolulu HI |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | Punaluu |
| Iem County | Hawaii |
| Iem State | HI |
| Iem Wfo | HFO |
| Iem Remark | Hwy 11 is closed near mile marker 56 at Ninole Loop due to flooding. |
| MergedSources | [{"id":"iem_F_19.070_-155.570_1789018860000","source":"iem","severity":"low","severityValue":25,"timestamp":1789018860000,"latitude":19.07,"longitude":-155.57},{"id":"iem_F_19.150_-155.510_1789018860000","source":"iem","severity":"low","severityValue":25,"timestamp":1789018860000,"latitude":19.15,"longitude":-155.51}] |
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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