This alert expired on 18 July 2026 at 19:00 UTC. It is kept here as a record.
No stronger detection stands among the 202 recorded within 20 km of this point since 11 March 2026 — 6 others scored the same. The last comparable one was on 9 July 2026. 29 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Tornado Warning issued July 18 at 2:33PM EDT until July 18 at 3:00PM EDT by NWS Baltimore MD/Washington DC
An estimated 3,178,806 people live within 50 km of this point.
Nearby, since 11 March 2026
- July 6, 2026 · score 52 · 4.9 km
- March 16, 2026 · score 76 · 5.7 km
- March 17, 2026 · score 52 · 7.8 km
How we know
One source: NOAA. Not yet confirmed by a second, independent source.
Our own score for this event is 76 out of 100, at 80 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | critical |
| Calamity Score (ours) | 76 / 100 |
| Our confidence | 80% |
| Coordinates | 39.3200, -77.2300 |
| Nearest City | Damascus (4 km) |
| Population Exposed | 3.2M within 50 km |
| Impact Tier | catastrophic |
| Timestamp | 2026-07-18T18:33:00.000Z |
| Source | https://api.weather.gov/alerts/urn:oid:2.49.0.1.840.0.b58b585fbebfe57f56abbccec78551a1a0cfacc5.001.1 |
Score Breakdown
Technical Details
| Event | Tornado Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Frederick, MD; Montgomery, MD |
| Headline | Tornado Warning issued July 18 at 2:33PM EDT until July 18 at 3:00PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-07-18T15:00:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
Safety Information
If a tornado warning is issued: go to a basement or an interior room on the lowest floor, away from windows. A vehicle and a mobile home are not shelter. Cover your head and neck. Wait for the official all-clear before going outside, and watch for downed power lines and gas leaks afterwards.
Series begins 10 February 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.
Calamity.live data shows a weather event with CalamityScore 76/100, near Damascus (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.