This alert expired on 7 July 2026 at 03:45 UTC. It is kept here as a record.
It is the 8th strongest of the 66 detections recorded within 20 km of this point since 17 March 2026. The last comparable one was on 5 July 2026. 8 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Flash Flood Warning issued July 6 at 8:32PM EDT until July 6 at 11:45PM EDT by NWS Baltimore MD/Washington DC
An estimated 418,099 people live within 50 km of this point.
Nearby, since 17 March 2026
- June 22, 2026 · score 43 · 3.2 km
- June 13, 2026 · score 43 · 6.4 km
- March 17, 2026 · score 67 · 8.7 km
How we know
Confirmed by 11 independent sources, including NOAA.
Our own score for this event is 43 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) | 43 / 100 |
| Our confidence | 91% |
| Coordinates | 37.8222, -77.3707 |
| Nearest City | Mechanicsville (24 km) |
| Population Exposed | 418.1K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-07T00:32:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Flash Flood Warning_noaa_urn:oid:2.49.0.1.840.0.31d2e499763323ebb2a42171136d986f |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Anne Arundel, MD; Harford, MD; Goochland, VA; Henrico, VA and 3 more areas |
| Headline | Flash Flood Warning issued July 6 at 8:32PM EDT until July 6 at 11:45PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-06T23:45:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 6 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.31d2e499763323ebb2a42171136d986f423a8939.001.1","noaa_urn:oid:2.49.0.1.840.0.7cb8461c06cb4289194ca0db5fb8fa27a4e66e50.001.1","noaa_urn:oid:2.49.0.1.840.0.895373a486301be2fb5fe25a7555e391c8cae25a.001.1","noaa_urn:oid:2.49.0.1.840.0.5b92f35377cede98a14037ff5209cbf2d5c4eaa5.001.1","noaa_urn:oid:2.49.0.1.840.0.a9d455d0dcbe7a3842d6c3d6d7eb1d91f97202dd.001.1","noaa_urn:oid:2.49.0.1.840.0.6cbba9b2e2712b4491d1d9af8726643b7fe0f23c.001.1"] |
| Iem TypeSummary | F |
| Iem City | 1 ESE Chester |
| Iem County | Chesterfield |
| Iem State | VA |
| Iem Wfo | AKQ |
| Iem Remark | A caller reported flooding along Executive Drive in Chester. |
| MergedSources | [{"id":"iem_L_37.340_-77.350_1783377900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783377900000,"latitude":37.34,"longitude":-77.35},{"id":"iem_D_37.470_-77.400_1783377600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783377600000,"latitude":37.47,"longitude":-77.4},{"id":"iem_F_37.370_-77.500_1783379400000","source":"iem","severity":"low","severityValue":25,"timestamp":1783379400000,"latitude":37.37,"longitude":-77.5},{"id":"iem_F_37.590_-77.820_1783383600000","source":"iem","severity":"low","severityValue":25,"timestamp":1783383600000,"latitude":37.59,"longitude":-77.82},{"id":"iem_E_37.410_-77.650_1783381320000","source":"iem","severity":"low","severityValue":25,"timestamp":1783381320000,"latitude":37.41,"longitude":-77.65},{"id":"iem_D_37.630_-76.570_1783366500000","source":"iem","severity":"low","severityValue":25,"timestamp":1783366500000,"latitude":37.63,"longitude":-76.57},{"id":"iem_F_37.520_-77.380_1783384380000","source":"iem","severity":"low","severityValue":25,"timestamp":1783384380000,"latitude":37.52,"longitude":-77.38},{"id":"iem_D_37.450_-77.610_1783378500000","source":"iem","severity":"low","severityValue":25,"timestamp":1783378500000,"latitude":37.45,"longitude":-77.61},{"id":"iem_F_37.380_-77.730_1783383000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783383000000,"latitude":37.38,"longitude":-77.73},{"id":"iem_F_37.340_-77.410_1783381920000","source":"iem","severity":"low","severityValue":25,"timestamp":1783381920000,"latitude":37.34,"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 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 43/100, near Mechanicsville (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.