Flash Flood Warning issued June 22 at 6:02PM EDT until June 22 at 9:00PM EDT by NWS Mount Holly NJ
Geographic Context
This weather event occurred near Radnor (approximately 4 km away) in United States, an area that experiences a range of natural hazards. An estimated 3.5M people live within 50 km of the event location, placing this in the "significant" population impact tier.
Event Assessment
This event is a weather event classified as medium severity. Calamity.live has classified it as "medium" severity with a severity value of 50. The computed Calamity Score is 52 out of 100, reflecting a moderate-impact event. The primary scoring components are: population (100), historical (80), intensity (35). Data for this event was sourced from noaa, one of the 196 scientific monitoring sources aggregated by Calamity.live.
Regional Monitoring Context
United States has a documented history of weather events. Monitoring for weather events in the region relies on a combination of ground-based sensors, satellite remote sensing, and official reporting from national agencies. The frequency and severity of such events are tracked over time to support risk assessment and emergency preparedness.
Event Data
| Type | Weather |
| Severity | medium |
| Severity Value | 50 |
| Calamity Score | 52 / 100 |
| Confidence | 87% |
| Coordinates | 40.0700, -75.3269 |
| Nearest City | Radnor (4 km) |
| Population Exposed | 3.5M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-22T22:02:00.000Z |
Score Breakdown
Technical Details
| Event | Flash Flood Warning |
| Urgency | Immediate |
| Certainty | Likely |
| AreaDesc | Delaware, PA; Montgomery, PA; Philadelphia, PA |
| Headline | Flash Flood Warning issued June 22 at 6:02PM EDT until June 22 at 9:00PM EDT by NWS Mount Holly NJ |
| Expires | 2026-06-22T21:00:00-04:00 |
| SenderName | NWS Mount Holly NJ |
| HasExactCoords | true |
| Iem TypeSummary | H |
| Iem Magnitude | 1 |
| Iem Unit | Inch |
| Iem City | 1 N Upper Uwchlan Twp |
| Iem County | Chester |
| Iem State | PA |
| Iem Wfo | PHI |
| Iem Remark | Report from mPING: Quarter (1.00 in.). |
| Google News RssFeed | weather |
| Google News SourceName | FOX 29 Philadelphia |
| MergedSources | [{"id":"iem_D_39.950_-75.680_1782163200000","source":"iem","severity":"low","severityValue":25,"timestamp":1782163200000,"latitude":39.95,"longitude":-75.68},{"id":"iem_D_39.890_-75.770_1782163080000","source":"iem","severity":"low","severityValue":25,"timestamp":1782163080000,"latitude":39.89,"longitude":-75.77},{"id":"iem_H_40.100_-75.690_1782161520000","source":"iem","severity":"low","severityValue":25,"timestamp":1782161520000,"latitude":40.1,"longitude":-75.69},{"id":"gnews_weather_495044_154","source":"google_news","severity":"medium","severityValue":40,"timestamp":1782161148000,"latitude":39.95,"longitude":-75.16}] |
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.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 52/100, near Radnor (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 196 scientific monitoring sources.