Right now
The most recent data we hold from NOAA arrived 2 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 11 June 2026 at 22:45 UTC. It is kept here as a record.
It is the 8th strongest of the 47 detections recorded within 20 km of this point since 22 March 2026. Another comparable one was recorded here earlier the same day. 2 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 11 at 6:33PM EDT until June 11 at 6:45PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 29,201 within a heuristic 50 km radius; not unique people.
Nearby, since 22 March 2026
- September 3, 2026 · score 32 · 15.0 km
- May 19, 2026 · score 34 · 16.2 km
- August 3, 2026 · score 34 · 16.9 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 28 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
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) | 28 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 40.9387, -77.2430 |
| Nearest City | Williamsport (39 km) |
| Urban exposure index (PEI) | 29.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-06-11T22:33:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.6ca6542eb97fbb2781f9289a00447428 |
Physical priority index · v1. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: noaa. Occurrence: 2026-06-11T22:33:00.000Z.
First archived: 2026-06-11T22:35:24.529Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Washington, MD; Frederick, VA; Page, VA; Rockingham, VA; Shenandoah, VA; Warren, VA; City of Winchester, VA; Berkeley, WV; Hampshire, WV; Hardy, WV; Morgan, WV; Pocahontas, WV; Randolph, WV; Centre, PA; Huntingdon, PA; Juniata, PA; Mifflin, PA; Perry, PA; Snyder, PA; Union, PA and 7 more areas |
| Headline | Severe Thunderstorm Warning issued June 11 at 6:33PM EDT until June 11 at 6:45PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-11T18:45:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 10 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.6ca6542eb97fbb2781f9289a0044742804f56694.002.1","noaa_urn:oid:2.49.0.1.840.0.05f4946e63f672141b6b929fe3cae724751f702a.001.1","noaa_urn:oid:2.49.0.1.840.0.7ffa842d6e9e4cf7dce3b557e7a6327d13c2013b.001.1","noaa_urn:oid:2.49.0.1.840.0.9bfc5c63410cf49a1744b822458bc5344db398f9.001.1","noaa_urn:oid:2.49.0.1.840.0.16188a4fd9665988def6f107d7cd237d8b191568.001.1","noaa_urn:oid:2.49.0.1.840.0.247083138c0fdb3c5731ffdf01d23e3db76a8ff8.001.1","noaa_urn:oid:2.49.0.1.840.0.007072da1c7e6dfcb943096ac99b792abee3aad0.002.1","noaa_urn:oid:2.49.0.1.840.0.6165c6bbf7f3a584bd9c2c20b65d7bf78b191dae.001.1","noaa_urn:oid:2.49.0.1.840.0.2a84134b9d86a6bd1ac72e4dca5896bb7a482bc4.002.1","noaa_urn:oid:2.49.0.1.840.0.87ad2861077165afd3aeb9b86a89576a090ff0f9.001.1"] |
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.
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