Right now
The most recent data we hold from NOAA arrived 2 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 4 August 2026 at 13:30 UTC. It is kept here as a record.
It is the 2nd strongest of the 167 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 27 July 2026. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 4 at 6:24AM EDT until August 4 at 9:30AM EDT by NWS Wakefield VA
Urban PEI: 511,761 within a heuristic 50 km radius; not unique people.
Nearby, since 17 March 2026
- July 22, 2026 · score 48 · 5.1 km
- September 4, 2026 · score 41 · 9.2 km
- September 2, 2026 · score 41 · 11.8 km
How we know
3 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 48 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) | 48 / 100 |
| Legacy data-support index | 0.91/1 |
| Coordinates | 37.3211, -77.4172 |
| Nearest City | Chester (5 km) |
| Urban exposure index (PEI) | 511.8K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-04T10:24:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.9ba2b7cc2e3195c5ddbf58e79500b52d988e96ac.001.1 |
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: 2026-08-04T10:24:00.000Z.
First archived: 2026-08-04T12:38:58.375Z. 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 | Chesterfield, VA; Henrico, VA; City of Hopewell, VA |
| Headline | Flash Flood Warning issued August 4 at 6:24AM EDT until August 4 at 9:30AM EDT by NWS Wakefield VA |
| Expires | 2026-08-04T09:30:00-04:00 |
| SenderName | NWS Wakefield VA |
| HasExactCoords | true |
| Iem TypeSummary | F |
| Iem City | 2 NE Chester |
| Iem County | Chesterfield |
| Iem State | VA |
| Iem Wfo | AKQ |
| Iem Remark | Standing water on the southbound VA-288 ramp onto I-95. Traffic camera corroborates. |
| MergedSources | [{"id":"iem_F_37.350_-77.390_1785840600000","source":"iem","severity":"low","severityValue":25,"timestamp":1785840600000,"latitude":37.35,"longitude":-77.39},{"id":"iem_F_37.380_-77.410_1785843060000","source":"iem","severity":"low","severityValue":25,"timestamp":1785843060000,"latitude":37.38,"longitude":-77.41}] |
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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