This alert expired on 27 August 2026 at 20:45 UTC. It is kept here as a record.
It is the 7th strongest of the 156 detections recorded within 20 km of this point since 12 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 27 at 4:24PM EDT until August 27 at 4:45PM EDT by NWS Baltimore MD/Washington DC
An estimated 3,144,886 people live within 50 km of this point.
Nearby, since 12 March 2026
- March 17, 2026 · score 52 · 3.4 km
- March 12, 2026 · score 52 · 4.3 km
- July 28, 2026 · score 46 · 4.6 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, at 79 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 52 / 100 |
| Our confidence | 79% |
| Coordinates | 39.3690, -77.0575 |
| Nearest City | Eldersburg (10 km) |
| Population Exposed | 3.1M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-27T20:24:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.b670c11b579c2b2facadd1e673061e71 |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Baltimore, MD; Harford, MD; Fauquier, VA; Rappahannock, VA; Warren, VA; Lancaster, PA and 2 more areas |
| Headline | Severe Thunderstorm Warning issued August 27 at 4:24PM EDT until August 27 at 4:45PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-27T16:45:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 5 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.b670c11b579c2b2facadd1e673061e7118a6adea.001.1","noaa_urn:oid:2.49.0.1.840.0.5ac4bd0fcc1bd3821f8785d066f2b790b4c241c1.001.1","noaa_urn:oid:2.49.0.1.840.0.1303ec86d00fc2a6e708361c9742d95160e7eae9.001.1","noaa_urn:oid:2.49.0.1.840.0.3c029b69ca16ae583da8dd1161a54e48bf006967.001.1","noaa_urn:oid:2.49.0.1.840.0.943700bc55b25224900996d0230fc1d163c915d2.001.1"] |
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 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 52/100, near Eldersburg (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.