This alert expired on 7 July 2026 at 09:30 UTC. It is kept here as a record.
It is the 5th strongest of the 118 detections recorded within 20 km of this point since 13 March 2026. Another comparable one was recorded here earlier the same day. 9 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flood Warning issued July 6 at 11:29PM EDT until July 7 at 5:30AM EDT by NWS Baltimore MD/Washington DC
An estimated 3,501,739 people live within 50 km of this point.
Nearby, since 13 March 2026
- July 5, 2026 · score 52 · 1.1 km
- March 16, 2026 · score 76 · 2.4 km
- March 17, 2026 · score 52 · 5.6 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 52 out of 100, at 81 % 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) | 52 / 100 |
| Our confidence | 81% |
| Coordinates | 38.9486, -77.5400 |
| Nearest City | South Riding (5 km) |
| Population Exposed | 3.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-07T03:29:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.e7a09be7c2acea2944d089782f2d30f2cbe0f698.001.1 |
Score Breakdown
Technical Details
| Event | Flood Warning |
| Urgency | Expected |
| Certainty | Likely |
| AreaDesc | Loudoun, VA |
| Headline | Flood Warning issued July 6 at 11:29PM EDT until July 7 at 5:30AM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-07T05:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
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 52/100, near South Riding (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.