Special Marine Warning
Special Marine Warning issued August 6 at 7:17PM EDT until August 6 at 8:45PM EDT by NWS Baltimore MD/Washington DC
Geographic Context
This weather event occurred near Greater Upper Marlboro (approximately 11 km away) in United States, an area that experiences a range of natural hazards. An estimated 4.2M people live within 50 km of the event location, placing this in the "catastrophic" population impact tier.
Event Assessment
This event is a weather event classified as critical severity. Calamity.live has classified it as "critical" severity with a severity value of 90. The computed Calamity Score is 66 out of 100, reflecting a moderate-impact event. The primary scoring components are: population (100), historical (80), intensity (70). Data for this event was sourced from noaa, one of the 196 scientific monitoring sources aggregated by Calamity.live.
Regional Monitoring Context
United States has a documented history of weather events. Monitoring for weather events in the region relies on a combination of ground-based sensors, satellite remote sensing, and official reporting from national agencies. The frequency and severity of such events are tracked over time to support risk assessment and emergency preparedness.
Event Data
| Type | Weather |
| Severity | critical |
| Severity Value | 90 |
| Calamity Score | 66 / 100 |
| Confidence | 90% |
| Coordinates | 38.8419, -76.6226 |
| Nearest City | Greater Upper Marlboro (11 km) |
| Population Exposed | 4.2M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-08-06T23:17:00.000Z |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Chesapeake Bay north of Pooles Island MD; Chesapeake Bay from Pooles Island to Sandy Point MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued August 6 at 7:17PM EDT until August 6 at 8:45PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-06T20:45:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.038e6a69efb548a2ffcb48830686d1f9efbd61a7.001.1","noaa_urn:oid:2.49.0.1.840.0.4efab05abb927cc6dba3c4e81643cd63cf1a6356.001.1"] |
| Iem TypeSummary | M |
| Iem Magnitude | 40 |
| Iem Unit | mph |
| Iem City | Quantico Marine Corp |
| Iem County | Prince William |
| Iem State | VA |
| Iem Wfo | LWX |
| Ogimet StationId | 72503 |
| Ogimet WindSpeed | 84 |
| Ogimet WindUnit | knots |
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.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 66/100, near Greater Upper Marlboro (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 196 scientific monitoring sources.