Severe Weather near Greater Upper Marlboro
Right now
The most recent data we hold from NOAA arrived 2 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 16 March 2026 at 21:00 UTC. It is kept here as a record.
It is the 15th strongest of the 251 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 6 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued March 16 at 2:57PM EDT until March 16 at 5:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 4,370,217 people live within 50 km of this point.
Nearby, since 11 March 2026
- August 6, 2026 · score 66 · 1.5 km
- May 20, 2026 · score 52 · 3.1 km
- August 10, 2026 · score 52 · 4.1 km
How we know
Confirmed by 10 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 88 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 88% |
| Coordinates | 38.8491, -76.6371 |
| Nearest City | Greater Upper Marlboro (10 km) |
| Population Exposed | 4.4M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-16T18:57:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.80f7a014c8b26093c7249762dacbc1f5 |
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; Chesapeake Bay from Sandy Point to North Beach MD; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued March 16 at 2:57PM EDT until March 16 at 5:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-03-16T17:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.80f7a014c8b26093c7249762dacbc1f5e12544a9.001.1","noaa_urn:oid:2.49.0.1.840.0.af9baf2812a0de2263221f5fbd86852eeedf73a7.001.1"] |
| Spc ReportType | wind |
| Spc Speed | UNK |
| Spc Location | 2 SW Reston |
| Spc County | Fairfax |
| Spc State | VA |
| Spc Comments | Tree reported down on Lawyers Road at Fox Mill Road. (LWX) |
| Google News RssFeed | weather |
| Google News SourceName | Secret DC |
| MergedSources | [{"id":"spc_wind_39.14_-77.40_90","source":"spc","severity":"medium","severityValue":45,"timestamp":1773675120000,"latitude":39.14,"longitude":-77.4},{"id":"spc_wind_39.17_-77.33_93","source":"spc","severity":"medium","severityValue":45,"timestamp":1773675360000,"latitude":39.17,"longitude":-77.33},{"id":"spc_wind_39.23_-77.26_94","source":"spc","severity":"medium","severityValue":45,"timestamp":1773675720000,"latitude":39.23,"longitude":-77.26},{"id":"spc_wind_39.25_-77.24_95","source":"spc","severity":"medium","severityValue":45,"timestamp":1773676080000,"latitude":39.25,"longitude":-77.24},{"id":"spc_wind_39.26_-77.23_96","source":"spc","severity":"medium","severityValue":45,"timestamp":1773676200000,"latitude":39.26,"longitude":-77.23},{"id":"spc_wind_38.92_-77.37_104","source":"spc","severity":"medium","severityValue":45,"timestamp":1773679860000,"latitude":38.92,"longitude":-77.37},{"id":"gnews_weather_492688_160","source":"google_news","severity":"medium","severityValue":40,"timestamp":1773677520000,"latitude":38.9,"longitude":-77.04},{"id":"gnews_weather_492690_168","source":"google_news","severity":"medium","severityValue":40,"timestamp":1773684399000,"latitude":38.9,"longitude":-77.04},{"id":"gnews_weather_492688_169","source":"google_news","severity":"medium","severityValue":40,"timestamp":1773677605000,"latitude":38.9,"longitude":-77.04}] |
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 8 March 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 52/100, 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.