Right now
The most recent data we hold from NOAA arrived 10 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 22 June 2026 at 21:45 UTC. It is kept here as a record.
It is the 2nd strongest of the 952 detections recorded within 20 km of this point since 10 March 2026. Another comparable one was recorded here earlier the same day. 10 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued June 22 at 5:05PM EDT until June 22 at 5:45PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 4,855,228 within a heuristic 50 km radius; not unique people.
Nearby, since 10 March 2026
- September 4, 2026 · score 46 · 4.8 km
- April 20, 2026 · score 52 · 6.2 km
- March 17, 2026 · score 52 · 7.5 km
How we know
2 recorded sources include NOAA; independence is not established by this count.
Our own score for this event is 66 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 | Critical |
| Calamity Score (ours) | 66 / 100 |
| Legacy data-support index | 0.81/1 |
| Coordinates | 38.9040, -76.9550 |
| Nearest City | H Street NE (4 km) |
| Urban exposure index (PEI) | 4.9M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-06-22T21:05:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.0b10993a99f41926bf0ff1e1b776ae3d |
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: 2026-06-22T21:05:00.000Z.
First archived: 2026-06-22T21:11:02.889Z. 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 | District of Columbia, DC; Montgomery, MD; Prince Georges, MD; Arlington, VA; Fairfax, VA; City of Alexandria, VA; City of Fairfax, VA; City of Falls Church, VA; Anne Arundel, MD; Prince Georges, MD |
| Headline | Severe Thunderstorm Warning issued June 22 at 5:05PM EDT until June 22 at 5:45PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-06-22T17:45:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.0b10993a99f41926bf0ff1e1b776ae3d8b0aeb28.001.1","noaa_urn:oid:2.49.0.1.840.0.052bdde0833d64faffd8fdccf7ba4eabe174a661.002.1"] |
| Ogimet StationId | 72503 |
| Ogimet WindSpeed | 84 |
| Ogimet WindUnit | knots |
| Ogimet Temperature | 22.8 |
| Ogimet TemperatureUnit | C |
| Ogimet RawSynop | 06,22,17,51,AAXX 22184 72503 12766 81113 10228 20172 30129 40142 58016 69901 91751 333 10228 20194 555 92218= |
| MergedSources | [{"id":"ogimet_72503_1782162039020","source":"ogimet","severity":"critical","severityValue":90,"timestamp":1782162039020,"latitude":38.9,"longitude":-77}] |
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.
Review the area, threshold and delivery channel in your account.
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