This alert is in force until 5 September 2026, 01:00 UTC.
It is the 138th strongest of the 259 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Watch issued September 4 at 2:04PM EDT until September 4 at 9:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 4,615,467 people live within 50 km of this point.
Nearby, since 11 March 2026
- September 4, 2026 · score 46 · 0.0 km
- September 3, 2026 · score 46 · 0.0 km
- September 2, 2026 · score 46 · 0.0 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 46 out of 100, at 80 % 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 | 80% |
| Coordinates | 39.0000, -76.6000 |
| Nearest City | Parole (6 km) |
| Population Exposed | 4.6M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-09-04T18:05:00.000Z |
| Source | https://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.8931ebb560f6d3f76e3f3384fb51965633f68623.001.1 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Watch |
| Urgency | Future |
| Certainty | Possible |
| AreaDesc | District of Columbia, DC; Allegany, MD; Charles, MD; Frederick, MD; Garrett, MD; Montgomery, MD; Prince Georges, MD; Washington, MD; Albemarle, VA; Arlington, VA; Augusta, VA; Clarke, VA; Culpeper, VA; Fairfax, VA; Fauquier, VA; Frederick, VA; Greene, VA; Highland, VA; King George, VA; Loudoun, VA; Madison, VA; Nelson, VA; Orange, VA; Page, VA; Prince William, VA; Rappahannock, VA; Rockingham, VA; Shenandoah, VA; Spotsylvania, VA; Stafford, VA; Warren, VA; City of Alexandria, VA; City of Charlottesville, VA; City of Fairfax, VA; City of Falls Church, VA; City of Fredericksburg, VA; City of Harrisonburg, VA; City of Manassas, VA; City of Manassas Park, VA; City of Staunton, VA; City of Waynesboro, VA; City of Winchester, VA; Berkeley, WV; Grant, WV; Hampshire, WV; Hardy, WV; Jefferson, WV; Mineral, WV; Morgan, WV; Pendleton, WV; Tidal Potomac from Key Bridge to Indian Head MD; Tidal Potomac from Indian Head to Cobb Island MD |
| Headline | Severe Thunderstorm Watch issued September 4 at 2:04PM EDT until September 4 at 9:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-09-04T21:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | false |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.8931ebb560f6d3f76e3f3384fb51965633f68623.001.1","noaa_urn:oid:2.49.0.1.840.0.8931ebb560f6d3f76e3f3384fb51965633f68623.002.1"] |
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.