This alert expired on 5 July 2026 at 01:45 UTC. It is kept here as a record.
It is the 77th strongest of the 292 detections recorded within 20 km of this point since 16 March 2026. Another comparable one was recorded here earlier the same day. 11 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued July 4 at 8:20PM EDT until July 4 at 9:45PM EDT by NWS Mount Holly NJ
An estimated 787,859 people live within 50 km of this point.
Nearby, since 16 March 2026
- July 4, 2026 · score 48 · 4.4 km
- August 2, 2026 · score 66 · 6.4 km
- July 28, 2026 · score 41 · 6.5 km
How we know
Confirmed by 15 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 89 % 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) | 48 / 100 |
| Our confidence | 89% |
| Coordinates | 38.7172, -76.4384 |
| Nearest City | Annapolis (30 km) |
| Population Exposed | 787.9K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-05T00:20:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Special Marine Warning_noaa_urn:oid:2.49.0.1.840.0.6e81b3a67153b5fda08ca52e52c59cb8 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Delaware Bay waters north of East Point NJ to Slaughter Beach DE; Delaware Bay waters south of East Point NJ to Slaughter Beach DE; Chesapeake Bay from Drum Point MD to Smith Point VA; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Special Marine Warning issued July 4 at 8:20PM EDT until July 4 at 9:45PM EDT by NWS Mount Holly NJ |
| Expires | 2026-07-04T21:45:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6e81b3a67153b5fda08ca52e52c59cb8eceb354d.001.1","noaa_urn:oid:2.49.0.1.840.0.b869cca9a9ec1e26000a8d3f11e0718120565327.001.1","noaa_urn:oid:2.49.0.1.840.0.94cd82fd3313d641826dd02d388a108cd3618a62.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 58 |
| Iem Unit | mph |
| Iem City | BWI Marshall Airport |
| Iem County | Anne Arundel |
| Iem State | MD |
| Iem Wfo | LWX |
| Iem Remark | A wind gust of 50 knots (58 MPH) was measured by the ASOS at Baltimore-Washington Thurgood Marshall International Airport (KBWI). |
| MergedSources | [{"id":"iem_D_38.520_-76.590_1783206780000","source":"iem","severity":"low","severityValue":25,"timestamp":1783206780000,"latitude":38.52,"longitude":-76.59},{"id":"iem_D_38.440_-76.690_1783206720000","source":"iem","severity":"low","severityValue":25,"timestamp":1783206720000,"latitude":38.44,"longitude":-76.69},{"id":"iem_M_38.850_-77.030_1783204320000","source":"iem","severity":"low","severityValue":25,"timestamp":1783204320000,"latitude":38.85,"longitude":-77.03},{"id":"iem_G_38.550_-76.240_1783209900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783209900000,"latitude":38.55,"longitude":-76.24},{"id":"iem_M_38.310_-76.930_1783203780000","source":"iem","severity":"low","severityValue":25,"timestamp":1783203780000,"latitude":38.31,"longitude":-76.93},{"id":"iem_D_39.110_-76.610_1783206900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783206900000,"latitude":39.11,"longitude":-76.61},{"id":"iem_D_39.300_-76.820_1783206360000","source":"iem","severity":"low","severityValue":25,"timestamp":1783206360000,"latitude":39.3,"longitude":-76.82},{"id":"iem_H_39.150_-76.630_1783206000000","source":"iem","severity":"low","severityValue":25,"timestamp":1783206000000,"latitude":39.15,"longitude":-76.63},{"id":"iem_D_38.550_-76.590_1783206900000","source":"iem","severity":"low","severityValue":25,"timestamp":1783206900000,"latitude":38.55,"longitude":-76.59},{"id":"iem_M_38.310_-77.000_1783203840000","source":"iem","severity":"low","severityValue":25,"timestamp":1783203840000,"latitude":38.31,"longitude":-77},{"id":"iem_M_38.340_-76.990_1783204080000","source":"iem","severity":"low","severityValue":25,"timestamp":1783204080000,"latitude":38.34,"longitude":-76.99},{"id":"iem_M_38.870_-77.020_1783204560000","source":"iem","severity":"low","severityValue":25,"timestamp":1783204560000,"latitude":38.87,"longitude":-77.02},{"id":"iem_M_38.640_-77.220_1783202760000","source":"iem","severity":"low","severityValue":25,"timestamp":1783202760000,"latitude":38.64,"longitude":-77.22},{"id":"iem_G_39.170_-76.680_1783206540000","source":"iem","severity":"low","severityValue":25,"timestamp":1783206540000,"latitude":39.17,"longitude":-76.68}] |
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 Annapolis?
Calamity.live data shows a weather event with CalamityScore 48/100, near Annapolis (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.