This alert expired on 8 August 2026 at 21:45 UTC. It is kept here as a record.
It is the 20th strongest of the 224 detections recorded within 20 km of this point since 17 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 8 at 5:08PM EDT until August 8 at 5:45PM EDT by NWS Baltimore MD/Washington DC
An estimated 153,507 people live within 50 km of this point.
Nearby, since 17 March 2026
- May 27, 2026 · score 43 · 2.5 km
- July 9, 2026 · score 67 · 2.6 km
- July 21, 2026 · score 37 · 4.6 km
How we know
Confirmed by 3 independent sources, including NOAA.
Our own score for this event is 43 out of 100, at 90 % 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 | 90% |
| Coordinates | 38.2583, -76.8758 |
| Nearest City | Saint Charles (38 km) |
| Population Exposed | 153.5K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-08T21:08:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.44693a85a6f679408783da1af97d4042 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA |
| Headline | Special Marine Warning issued August 8 at 5:08PM EDT until August 8 at 5:45PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-08T17:45:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.44693a85a6f679408783da1af97d404283777b8b.001.1","noaa_urn:oid:2.49.0.1.840.0.ddf90f147460c3b9b1d43404cf4bd0720b78901d.001.1"] |
| Iem TypeSummary | D |
| Iem City | 2 SE Stafford |
| Iem County | Stafford |
| Iem State | VA |
| Iem Wfo | LWX |
| Iem Remark | Numerous trees down blocking VA-630 Courthouse Road near Galt Way. |
| MergedSources | [{"id":"iem_M_38.510_-77.300_1786222200000","source":"iem","severity":"low","severityValue":25,"timestamp":1786222200000,"latitude":38.51,"longitude":-77.3},{"id":"iem_D_38.400_-77.380_1786221600000","source":"iem","severity":"low","severityValue":25,"timestamp":1786221600000,"latitude":38.4,"longitude":-77.38}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
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 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.