Severe Weather near Greater Upper Marlboro
This alert expired on 3 August 2026 at 19:15 UTC. It is kept here as a record.
It is the 9th strongest of the 143 detections recorded within 20 km of this point since 16 March 2026. The last comparable one was on 2 August 2026. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 3 at 1:08PM EDT until August 3 at 3:15PM EDT by NWS Baltimore MD/Washington DC
An estimated 3,739,809 people live within 50 km of this point.
Nearby, since 16 March 2026
- June 11, 2026 · score 46 · 6.1 km
- July 4, 2026 · score 52 · 7.1 km
- March 21, 2026 · score 52 · 8.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 58 out of 100, at 87 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | high |
| Calamity Score (ours) | 58 / 100 |
| Our confidence | 87% |
| Coordinates | 38.7774, -76.7374 |
| Nearest City | Greater Upper Marlboro (6 km) |
| Population Exposed | 3.7M within 50 km |
| Impact Tier | severe |
| Timestamp | 2026-08-03T17:08:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.34c1de42be1424d8cec2d39c1927c1c3 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Chesapeake Bay from Sandy Point to North Beach MD; Eastern Bay; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued August 3 at 1:08PM EDT until August 3 at 3:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-03T15:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.34c1de42be1424d8cec2d39c1927c1c3bb4f3b02.001.1","noaa_urn:oid:2.49.0.1.840.0.e7c5d422e48010f0d40520a990850b22d412fcc0.001.1"] |
| Ogimet StationId | 72503 |
| Ogimet WindSpeed | 51 |
| Ogimet WindUnit | knots |
| Ogimet Temperature | -55.8 |
| Ogimet TemperatureUnit | C |
| Ogimet RawSynop | 08,03,11,51,AAXX 03124 72503 11558 81907 10239 20228 30057 40070 50007 60421 710// 91151 333 10300 20233 70429 96010 555 90312= |
| MergedSources | [{"id":"ogimet_72503_1785777876051","source":"ogimet","severity":"high","severityValue":70,"timestamp":1785777876051,"latitude":38.9,"longitude":-77}] |
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.
Want to know when something happens near Greater Upper Marlboro?
Calamity.live data shows a weather event with CalamityScore 58/100, near Greater Upper Marlboro (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.