This alert is in force until 2 September 2026, 21:00 UTC.
It is the 138th strongest of the 207 detections recorded within 20 km of this point since 11 March 2026. The last comparable one was on 20 August 2026.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 2 at 11:47AM EDT until September 2 at 5:00PM EDT by NWS Mount Holly NJ
An estimated 4,615,467 people live within 50 km of this point.
Nearby, since 11 March 2026
- August 10, 2026 · score 52 · 0.0 km
- July 22, 2026 · score 52 · 0.0 km
- July 4, 2026 · score 52 · 0.0 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 46 out of 100, at 87 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Severe Weather |
| Severity | Medium |
| Calamity Score (ours) | 46 / 100 |
| Our confidence | 87% |
| Coordinates | 39.0000, -76.6000 |
| Nearest City | Parole (6 km) |
| Population Exposed | 4.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-02T15:47:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.b529d5702bd8a2fa8a705278af64c49624406ec9.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | Caroline, MD; Kent, MD; Queen Anne's, MD; Talbot, MD; 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; Chesapeake Bay from North Beach to Drum Point MD; Chesapeake Bay from Drum Point MD to Smith Point VA; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD; Tidal Potomac from Cobb Island MD to Smith Point VA; Patapsco River including Baltimore Harbor; Chester River to Queenstown MD; Eastern Bay; Choptank River to Cambridge MD and the Little Choptank River; Patuxent River to Broomes Island MD; District of Columbia, DC; Allegany, MD; Anne Arundel, MD; Baltimore, MD; Calvert, MD; Carroll, MD; Cecil, MD; Charles, MD; Frederick, MD; Harford, MD; Howard, MD; Montgomery, MD; Prince Georges, MD; St. Marys, MD; Washington, MD; Baltimore City, MD; Arlington, VA; Clarke, VA; Culpeper, VA; Fairfax, VA; Fauquier, VA; Frederick, VA; Greene, VA; King George, VA; Loudoun, VA; Madison, VA; Orange, VA; Page, VA; Prince William, VA; Rappahannock, VA; Shenandoah, VA; Spotsylvania, VA; Stafford, VA; Warren, VA; City of Alexandria, VA; City of Fairfax, VA; City of Falls Church, VA; City of Fredericksburg, VA; City of Manassas, VA; City of Manassas Park, VA; City of Winchester, VA; Berkeley, WV; Hampshire, WV; Hardy, WV; Jefferson, WV; Mineral, WV; Morgan, WV |
| Headline | Severe Thunderstorm Watch issued September 2 at 11:47AM EDT until September 2 at 5:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-09-02T17:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | false |
| MergedCount | 3 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b529d5702bd8a2fa8a705278af64c49624406ec9.001.1","noaa_urn:oid:2.49.0.1.840.0.98435a7da01f4f96ebbcb025c46a39d08fd3ea1b.002.1","noaa_urn:oid:2.49.0.1.840.0.98435a7da01f4f96ebbcb025c46a39d08fd3ea1b.001.1"] |
| Google News RssFeed | weather |
| Google News SourceName | NBC4 Washington |
| MergedSources | [{"id":"gnews_weather_496761_252","source":"google_news","severity":"medium","severityValue":40,"timestamp":1788342621000,"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 Parole?
Calamity.live data shows a weather event with CalamityScore 46/100, near Parole (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.