Right now
The most recent data we hold from NOAA arrived 40 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 27 May 2026 at 15:45 UTC. It is kept here as a record.
It is the 6th strongest of the 83 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 May 27 at 10:21AM EDT until May 27 at 11:45AM EDT by NWS Pittsburgh PA
Urban PEI: 34,885 within a heuristic 50 km radius; not unique people.
Nearby, since 16 March 2026
- June 28, 2026 · score 34 · 9.1 km
- May 21, 2026 · score 34 · 16.8 km
- July 21, 2026 · score 63 · 18.0 km
How we know
13 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 34 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) | 34 / 100 |
| Legacy data-support index | 0.89/1 |
| Coordinates | 39.0868, -80.0309 |
| Nearest City | Clarksburg (34 km) |
| Urban exposure index (PEI) | 34.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-27T14:21:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.00d45bbbb3c293187647785d67b9a7d9 |
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: 2026-05-27T14:21:00.000Z.
First archived: 2026-05-27T15:06:29.468Z. 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 | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Preston, WV; Tucker, WV; Barbour, WV; Braxton, WV; Calhoun, WV; Gilmer, WV; Harrison, WV; Lewis, WV; Randolph, WV; Roane, WV; Taylor, WV; Upshur, WV |
| Headline | Flash Flood Warning issued May 27 at 10:21AM EDT until May 27 at 11:45AM EDT by NWS Pittsburgh PA |
| Expires | 2026-05-27T11:45:00-04:00 |
| SenderName | NWS Pittsburgh PA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.00d45bbbb3c293187647785d67b9a7d9213b9e4a.001.1","noaa_urn:oid:2.49.0.1.840.0.5a519af12401f990f225f6304abf43fecfd10323.001.1"] |
| Iem TypeSummary | F |
| Iem City | 3 ESE Monongah |
| Iem County | Marion |
| Iem State | WV |
| Iem Wfo | PBZ |
| Iem Remark | Roadway flooding along Pleasant Valley Rd. Street is being marked off and closed. |
| MergedSources | [{"id":"iem_F_39.040_-80.650_1779885960000","source":"iem","severity":"low","severityValue":25,"timestamp":1779885960000,"latitude":39.04,"longitude":-80.65},{"id":"iem_F_39.100_-80.470_1779891420000","source":"iem","severity":"low","severityValue":25,"timestamp":1779891420000,"latitude":39.1,"longitude":-80.47},{"id":"iem_F_39.080_-80.470_1779884820000","source":"iem","severity":"low","severityValue":25,"timestamp":1779884820000,"latitude":39.08,"longitude":-80.47},{"id":"iem_F_39.480_-80.120_1779877140000","source":"iem","severity":"low","severityValue":25,"timestamp":1779877140000,"latitude":39.48,"longitude":-80.12},{"id":"iem_E_39.470_-80.090_1779876720000","source":"iem","severity":"low","severityValue":25,"timestamp":1779876720000,"latitude":39.47,"longitude":-80.09},{"id":"iem_F_39.380_-80.280_1779881880000","source":"iem","severity":"low","severityValue":25,"timestamp":1779881880000,"latitude":39.38,"longitude":-80.28},{"id":"iem_F_39.070_-79.960_1779888180000","source":"iem","severity":"low","severityValue":25,"timestamp":1779888180000,"latitude":39.07,"longitude":-79.96},{"id":"iem_F_38.950_-80.830_1779886680000","source":"iem","severity":"low","severityValue":25,"timestamp":1779886680000,"latitude":38.95,"longitude":-80.83},{"id":"iem_x_39.430_-80.150_1779878100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779878100000,"latitude":39.43,"longitude":-80.15},{"id":"iem_F_39.450_-80.130_1779878160000","source":"iem","severity":"low","severityValue":25,"timestamp":1779878160000,"latitude":39.45,"longitude":-80.13},{"id":"iem_F_39.470_-80.090_1779876720000","source":"iem","severity":"low","severityValue":25,"timestamp":1779876720000,"latitude":39.47,"longitude":-80.09},{"id":"iem_F_39.440_-80.170_1779875340000","source":"iem","severity":"low","severityValue":25,"timestamp":1779875340000,"latitude":39.44,"longitude":-80.17}] |
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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