Calamity
MediumSevere WeatherCalamity Score: 28

Severe Weather in United States

MercerUnited StatesNOAA

Right now

The most recent data we hold from NOAA arrived 40 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.

2 other detections within 20 km in the last 24 hours, the nearest <1 km from here.

This alert expired on 13 September 2026 at 21:15 UTC. It is kept here as a record.

It is the 88th strongest of the 193 detections recorded within 20 km of this point since 12 March 2026. The last comparable one was on 4 September 2026. 151 more were recorded here in the fortnight before it.

What the source measured

NOAA reported: Severe Thunderstorm Warning issued September 13 at 4:42PM EDT until September 13 at 5:15PM EDT by NWS Cleveland OH

An estimated 16,028 people live within 50 km of this point.

Nearby, since 12 March 2026

How we know

Confirmed by 2 independent sources, including NOAA.

Our own score for this event is 28 out of 100, at 86 % confidence.

The score is ours, computed from intensity, exposed population and local history — not the source’s.

Computed under scoring rules v4. Rows carrying other versions were judged by different rules and are not directly comparable.

Event Data

TypeSevere Weather
SeverityMedium
Calamity Score (ours)28 / 100
Our confidence86%
Coordinates41.4563, -80.2077
Nearest CityHermitage (32 km)
Population Exposed16.0K within 50 km
Impact Tiersignificant
Timestamp2026-09-13T20:42:00.000Z
Sourcehttps://api.weather.gov/alerts/urn%3Aoid%3A2.49.0.1.840.0.4f3e16e4add8f8603209272372535bc86c120d03.001.1

Score Breakdown

35
intensity
40
population
0
cascading
18
historical

Technical Details

EventSevere Thunderstorm Warning
UrgencyImmediate
CertaintyObserved
AreaDescCrawford, PA; Mahoning, OH; Trumbull, OH
HeadlineSevere Thunderstorm Warning issued September 13 at 4:42PM EDT until September 13 at 5:15PM EDT by NWS Cleveland OH
Expires2026-09-13T17:15:00-04:00
SenderNameNWS Cleveland OH
HasExactCoordstrue
MergedCount3
MergedIds["noaa_urn:oid:2.49.0.1.840.0.4f3e16e4add8f8603209272372535bc86c120d03.001.1","noaa_urn:oid:2.49.0.1.840.0.f06002442d8c4aefc22380b9a395535ccc23321a.002.1","noaa_urn:oid:2.49.0.1.840.0.41a89dbb9ac20525f4de1daae612044cd3e536c5.001.1"]
Spc ReportTypewind
Spc SpeedUNK
Spc Location5 WNW Meadville
Spc CountyCrawford
Spc StatePA
Spc CommentsTree and wires down across State Highway 98 near Rogers Ferry Rd. (CLE)
MergedSources[{"id":"spc_wind_41.68_-80.22_1","source":"spc","severity":"medium","severityValue":45,"timestamp":1789330920000,"latitude":41.68,"longitude":-80.22}]

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.

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