Right now
The most recent data we hold from NOAA arrived 19 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
This alert expired on 20 May 2026 at 21:30 UTC. It is kept here as a record.
It is the 6th strongest of the 289 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day. 4 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued May 20 at 4:55PM EDT until May 20 at 5:30PM EDT by NWS Baltimore MD/Washington DC
An estimated 3,252,274 people live within 50 km of this point.
Nearby, since 12 March 2026
- September 2, 2026 · score 46 · 7.3 km
- May 20, 2026 · score 52 · 7.6 km
- September 2, 2026 · score 46 · 8.0 km
How we know
Confirmed by 8 independent sources, including NOAA.
Our own score for this event is 52 out of 100, at 90 % 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) | 52 / 100 |
| Our confidence | 90% |
| Coordinates | 40.1248, -75.5481 |
| Nearest City | Phoenixville (3 km) |
| Population Exposed | 3.3M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-05-20T20:55:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.b4adbaf2e5bda1ffed8f8e512b361ece |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Baltimore, MD; Cecil, MD; Harford, MD; Berks, PA; Chester, PA; Montgomery, PA; Lancaster, PA and 4 more areas |
| Headline | Severe Thunderstorm Warning issued May 20 at 4:55PM EDT until May 20 at 5:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-05-20T17:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 8 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b4adbaf2e5bda1ffed8f8e512b361ece05f0d5a6.001.1","noaa_urn:oid:2.49.0.1.840.0.36c28db69d1b9b28c1221b351d94a053822b59e8.001.1","noaa_urn:oid:2.49.0.1.840.0.e5fd3a00ea604198607be6ef3d676aaf5f200fe0.001.1","noaa_urn:oid:2.49.0.1.840.0.a2a05b119b506c57a46ab9907e90778380ac7d0a.001.1","noaa_urn:oid:2.49.0.1.840.0.7772b2ba4415975e274f81ed1f32cef938c13d4b.001.1","noaa_urn:oid:2.49.0.1.840.0.98e25e7f69ca8d83252a753b71687388f4a2682b.001.1","noaa_urn:oid:2.49.0.1.840.0.6f5a485635b8674adfd2e57e706a6c94cb21d12e.001.1","noaa_urn:oid:2.49.0.1.840.0.b9fb1b0221dd257b7bb076d0334522341a9878ef.001.1"] |
| Iem TypeSummary | D |
| Iem City | 3 SSE Kenhorst |
| Iem County | Berks |
| Iem State | PA |
| Iem Wfo | PHI |
| Iem Remark | Trees down on wires along Mount Penn Road. Time estimated from radar. |
| MergedSources | [{"id":"iem_D_40.540_-75.760_1779309180000","source":"iem","severity":"low","severityValue":25,"timestamp":1779309180000,"latitude":40.54,"longitude":-75.76},{"id":"iem_D_40.550_-76.000_1779308100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779308100000,"latitude":40.55,"longitude":-76},{"id":"iem_D_40.020_-76.360_1779308040000","source":"iem","severity":"low","severityValue":25,"timestamp":1779308040000,"latitude":40.02,"longitude":-76.36},{"id":"iem_D_40.260_-75.930_1779308040000","source":"iem","severity":"low","severityValue":25,"timestamp":1779308040000,"latitude":40.26,"longitude":-75.93},{"id":"iem_D_40.040_-76.360_1779306780000","source":"iem","severity":"low","severityValue":25,"timestamp":1779306780000,"latitude":40.04,"longitude":-76.36},{"id":"iem_D_40.330_-76.350_1779305700000","source":"iem","severity":"low","severityValue":25,"timestamp":1779305700000,"latitude":40.33,"longitude":-76.35},{"id":"iem_D_40.270_-75.930_1779308100000","source":"iem","severity":"low","severityValue":25,"timestamp":1779308100000,"latitude":40.27,"longitude":-75.93}] |
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.
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