Right now
The most recent data we hold from NOAA arrived 9 minutes ago, and this point is in it.
3 other detections within 20 km in the last 24 hours, the nearest 2 km from here.
This alert is in force until 23 September 2026, 21:30 UTC.
It is the 45th strongest of the 188 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued September 23 at 2:04PM EDT until September 23 at 5:30PM EDT by NWS Charleston WV
Urban PEI: 46,838 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- March 17, 2026 · score 34 · 2.8 km
- May 20, 2026 · score 58 · 8.7 km
- July 6, 2026 · score 34 · 15.8 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 28 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 v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 28 / 100 |
| Legacy data-support index | 0.86/1 |
| Coordinates | 38.3975, -81.7104 |
| Nearest City | Charleston (9 km) |
| Urban exposure index (PEI) | 46.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-23T18:04:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.105b177c89a13d483cc9bebd34904d0eca54bd0f.001.1 |
Physical priority index · v5. 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: 2026-09-23T18:04:00.000Z.
First archived: 2026-09-23T18:11:27.233Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-09-23T18:17:13.407Z · data_change
Index 28 → 28; severity medium → medium; version 5 → 5.
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Boone, WV; Lincoln, WV; Cabell, WV; Wayne, WV; Gilmer, WV |
| Headline | Flash Flood Warning issued September 23 at 2:04PM EDT until September 23 at 5:30PM EDT by NWS Charleston WV |
| Expires | 2026-09-23T17:30:00-04:00 |
| SenderName | NWS Charleston WV |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.105b177c89a13d483cc9bebd34904d0eca54bd0f.001.1","noaa_urn:oid:2.49.0.1.840.0.a582ed76b697f674998ffcb8c5b2dc3fc4f6094b.001.1","noaa_urn:oid:2.49.0.1.840.0.279878c78fe2ce18bf13a7b66784419dd3129440.001.1"] |
| Iem TypeSummary | F |
| Iem City | 5 NW Danville |
| Iem County | Boone |
| Iem State | WV |
| Iem Wfo | RLX |
| Iem Remark | High water across road. Time is estimated. |
| MergedSources | [{"id":"iem_F_38.130_-81.920_1790184600000","source":"iem","severity":"low","severityValue":25,"timestamp":1790184600000,"latitude":38.13,"longitude":-81.92},{"id":"iem_F_38.140_-81.900_1790184600000","source":"iem","severity":"low","severityValue":25,"timestamp":1790184600000,"latitude":38.14,"longitude":-81.9}] |
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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