Right now
The most recent data we hold from NOAA arrived 7 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 18 July 2026 at 19:30 UTC. It is kept here as a record.
It is the 6th strongest of the 156 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 9 July 2026. 26 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued July 18 at 3:14PM EDT until July 18 at 3:30PM EDT by NWS Baltimore MD/Washington DC
Urban PEI: 3,072,308 within a heuristic 50 km radius; not unique people.
Nearby, since 12 March 2026
- June 12, 2026 · score 52 · 4.5 km
- May 28, 2026 · score 52 · 5.6 km
- June 22, 2026 · score 76 · 5.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
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 | 38.5588, -77.2119 |
| Nearest City | Cherry Hill (5 km) |
| Urban exposure index (PEI) | 3.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-07-18T19:14:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.d85c738461cc40f6872376b085f2557a |
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: 2026-07-18T19:14:00.000Z.
First archived: 2026-07-18T19:16:38.047Z. 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 | Fairfax, VA; Prince William, VA; City of Manassas, VA; City of Manassas Park, VA; Adams, PA; York, PA; Burlington, NJ; Mercer, NJ; Middlesex, NJ; Monmouth, NJ; Ocean, NJ; Bucks, PA and 4 more areas |
| Headline | Severe Thunderstorm Warning issued July 18 at 3:14PM EDT until July 18 at 3:30PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-18T15:30:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 7 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.d85c738461cc40f6872376b085f2557ac6c5e70e.002.1","noaa_urn:oid:2.49.0.1.840.0.78769875494eba8818928ce6e58563fa012fe529.001.1","noaa_urn:oid:2.49.0.1.840.0.9e37054d3d95de73c01a28954c4c309dc47b5976.001.1","noaa_urn:oid:2.49.0.1.840.0.3914f898a66107da2c475bb35e6cfbc235865bf3.001.1","noaa_urn:oid:2.49.0.1.840.0.1f87846f70e205d38ae8663d71687b81927a2e03.001.1","noaa_urn:oid:2.49.0.1.840.0.9acaecb06059cc5e65b92a8dc323d765bd581877.001.1","noaa_urn:oid:2.49.0.1.840.0.627e4808a7337764d33f60a1ef4082ea990a9bb6.001.1"] |
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.
Review the area, threshold and delivery channel in your account.
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