This alert expired on 10 August 2026 at 20:15 UTC. It is kept here as a record.
It is the 32nd strongest of the 135 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 8 August 2026. 42 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Special Marine Warning issued August 10 at 3:13PM EDT until August 10 at 4:15PM EDT by NWS Baltimore MD/Washington DC
An estimated 567,553 people live within 50 km of this point.
Nearby, since 11 March 2026
- March 12, 2026 · score 48 · 4.7 km
- August 8, 2026 · score 46 · 6.5 km
- March 11, 2026 · score 52 · 7.1 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 48 out of 100, at 85 % 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) | 48 / 100 |
| Our confidence | 85% |
| Coordinates | 39.4548, -75.9900 |
| Nearest City | Aberdeen (16 km) |
| Population Exposed | 567.6K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T19:13:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.40982fc4b1ffa48932caca1b4857b5c943ac6fab.001.1 |
Score Breakdown
Technical Details
| Event | Special Marine Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Chesapeake Bay north of Pooles Island MD |
| Headline | Special Marine Warning issued August 10 at 3:13PM EDT until August 10 at 4:15PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-10T16:15:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| Iem TypeSummary | D |
| Iem City | 1 SSW Lancaster |
| Iem County | Lancaster |
| Iem State | PA |
| Iem Wfo | CTP |
| Iem Remark | Numerous trees and wires down on the south side of Lancaster. |
| MergedSources | [{"id":"iem_D_40.020_-76.310_1786368300000","source":"iem","severity":"low","severityValue":25,"timestamp":1786368300000,"latitude":40.02,"longitude":-76.31}] |
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 Aberdeen?
Calamity.live data shows a weather event with CalamityScore 48/100, near Aberdeen (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.