Right now
The most recent data we hold from SPC arrived 5 hours ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Reported by SPC 185 days ago.
What the source measured
SPC reported: Wind 61 kt near 3 NW Dulles Internation, Loudoun, VA. Measured at WFO LWX (LWX)
Urban PEI: 3,732,971 within a heuristic 50 km radius; not unique people.
How we know
3 recorded sources include SPC; independence is not established by this count.
Our own score for this event is 52 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) | 52 / 100 |
| Legacy data-support index | 0.80/1 |
| Coordinates | 38.9800, -77.4900 |
| Nearest City | Sterling (6 km) |
| Urban exposure index (PEI) | 3.7M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-03-17T00:34:00.000Z |
| Source | https://www.spc.noaa.gov/climo/reports/today.html |
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: spc. Occurrence: 2026-03-17T00:34:00.000Z.
First archived: 2026-03-17T05:33:21.390Z. 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
| ReportType | wind |
| Speed | 61 |
| Location | 3 NW Dulles Internation |
| County | Loudoun |
| State | VA |
| Comments | Measured at WFO LWX (LWX) |
| Iem TypeSummary | G |
| Iem Magnitude | 61 |
| Iem Unit | mph |
| Iem City | 3 NW Dulles Internation |
| Iem County | Loudoun |
| Iem State | VA |
| Iem Wfo | LWX |
| Iem Remark | Measured at WFO LWX |
| MergedSources | [{"id":"iem_G_38.980_-77.490_1773707880000","source":"iem","severity":"low","severityValue":25,"timestamp":1773707880000,"latitude":38.98,"longitude":-77.49},{"id":"iem_G_38.980_-77.490_1773707640000","source":"iem","severity":"low","severityValue":25,"timestamp":1773707640000,"latitude":38.98,"longitude":-77.49}] |
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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