This alert expired on 10 August 2026 at 20:45 UTC. It is kept here as a record.
It is the 15th strongest of the 246 detections recorded within 20 km of this point since 11 March 2026. Another comparable one was recorded here earlier the same day. 7 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 10 at 4:10PM EDT until August 10 at 4:45PM EDT by NWS Baltimore MD/Washington DC
An estimated 1,939,731 people live within 50 km of this point.
Nearby, since 11 March 2026
- March 12, 2026 · score 52 · 7.2 km
- July 9, 2026 · score 52 · 7.4 km
- March 16, 2026 · score 52 · 8.1 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 | 39.2683, -77.3937 |
| Nearest City | Ballenger Creek (12 km) |
| Population Exposed | 1.9M within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-10T20:10:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.9773de75d375bf72c89e41b85cd0e11b |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Baltimore, MD; Carroll, MD; Howard, MD; Carroll, MD; Frederick, MD; York, PA and 14 more areas |
| Headline | Severe Thunderstorm Warning issued August 10 at 4:10PM EDT until August 10 at 4:45PM EDT by NWS Baltimore MD/Washington DC |
| Expires | 2026-08-10T16:45:00-04:00 |
| SenderName | NWS Baltimore MD/Washington DC |
| HasExactCoords | true |
| MergedCount | 17 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.9773de75d375bf72c89e41b85cd0e11bf2c1edef.001.1","noaa_urn:oid:2.49.0.1.840.0.b1b7c473a392456271ffd0a39683cc6d57b5def6.001.1","noaa_urn:oid:2.49.0.1.840.0.b04fe311ed055435d94771b0f2fae2618d3e72d4.001.1","noaa_urn:oid:2.49.0.1.840.0.1b917de414e3bf900da8f6a3e67cd524756d5dfc.001.1","noaa_urn:oid:2.49.0.1.840.0.d209e3eceb210dd529a03ba3869d26b7bee7b2fe.001.1","noaa_urn:oid:2.49.0.1.840.0.13a2d1a07b6b044d7b56ce57abc2a2019a489405.001.1","noaa_urn:oid:2.49.0.1.840.0.42c6773fc867ad624090e9a85533f540d4037945.001.1","noaa_urn:oid:2.49.0.1.840.0.6f1933e2761cfe03727f6e965c2164dd66f2dd52.001.1","noaa_urn:oid:2.49.0.1.840.0.8e65a1d3f90be24f2936eb4e3b384f360bba8008.001.1","noaa_urn:oid:2.49.0.1.840.0.4ef601e89f331d1831cc0c56e0afc5fb9019706f.001.1","noaa_urn:oid:2.49.0.1.840.0.2b2e39e33584c9d2a1e7d3e78d9948b345a3c67c.001.1","noaa_urn:oid:2.49.0.1.840.0.e1a446ead06926d61cff9d193be2b14d7bc80b2f.001.1","noaa_urn:oid:2.49.0.1.840.0.fc79682f6d01adb3012a7287205883909eaef40a.001.1","noaa_urn:oid:2.49.0.1.840.0.66fb1015230fe695d21139bcd74f3ad319a8f064.001.1","noaa_urn:oid:2.49.0.1.840.0.d18090bb177374aea140021f70fc9d2f965646ee.001.1","noaa_urn:oid:2.49.0.1.840.0.d26df44dbbc5549fbf259cf33d49766c390625f9.001.1","noaa_urn:oid:2.49.0.1.840.0.1bf2bdc28ae0a6cc7637f1a252d55bceb2aab543.001.1"] |
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 Ballenger Creek (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.