This alert expired on 4 August 2026 at 20:00 UTC. It is kept here as a record.
It is the 7th strongest of the 38 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 28 July 2026. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued August 4 at 1:54PM EDT until August 4 at 4:00PM EDT by NWS Wakefield VA
An estimated 677,669 people live within 50 km of this point.
Nearby, since 17 March 2026
- July 28, 2026 · score 72 · 10.2 km
- July 4, 2026 · score 48 · 14.7 km
- June 23, 2026 · score 52 · 16.1 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 91 % 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) | 48 / 100 |
| Our confidence | 91% |
| Coordinates | 37.0897, -76.8368 |
| Nearest City | Williamsburg (23 km) |
| Population Exposed | 677.7K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-04T17:54:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.7e286ff3ab82dfbdc1621909e986a8ad |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Chesterfield, VA; Prince George, VA; City of Colonial Heights, VA; City of Hopewell, VA; City of Chesapeake, VA; City of Norfolk, VA; City of Portsmouth, VA; City of Suffolk, VA |
| Headline | Flash Flood Warning issued August 4 at 1:54PM EDT until August 4 at 4:00PM EDT by NWS Wakefield VA |
| Expires | 2026-08-04T16:00:00-04:00 |
| SenderName | NWS Wakefield VA |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.7e286ff3ab82dfbdc1621909e986a8ad5b522e10.001.1","noaa_urn:oid:2.49.0.1.840.0.11cc39fd6a736f96fd8cb2978794fdf40a1af597.001.1"] |
| Iem TypeSummary | F |
| Iem City | 1 SSW Downtown Norfolk |
| Iem County | City of Norfolk |
| Iem State | VA |
| Iem Wfo | AKQ |
| Iem Remark | Picture of flooding at Colleye Ave train trestle underpass in Norfolk. Around 1 foot of water at low spot of underpass. |
| MergedSources | [{"id":"iem_F_36.860_-76.290_1785865500000","source":"iem","severity":"low","severityValue":25,"timestamp":1785865500000,"latitude":36.86,"longitude":-76.29},{"id":"iem_F_36.850_-76.290_1785865980000","source":"iem","severity":"low","severityValue":25,"timestamp":1785865980000,"latitude":36.85,"longitude":-76.29}] |
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 48/100, near Williamsburg (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.