Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Earth science · e554b29d

Assessment

Why?

Strongest counted support: High-speed camera records show the CN Tower struck by 13 flashes within 111.4 minutes during a single storm on 5 September 2014. weight 2.000000 evidence

Review gaps: independence reviewed, primary source reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Supported.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “Lightning strikes the same location repeatedly, especially tall, pointed, isolated objects.” · 1 claim · 28 September 2026

Evidence for

• The US National Weather Service lists "lightning never strikes the same place twice" under myths and states that lightning often strikes the same place repeatedly, especially tall, pointy, isolated objects, giving the Empire State Building at an average of 23 strikes a year.

  From Lightning Myths and Facts Read 2026-09-18 Relevance DIRECT Steps 0 Counted

• The National Weather Service states that height, pointy shape and isolation, not metal content, control where lightning strikes, and that tall isolated natural objects are struck many times a year.

  From Lightning Myths and Facts Read 2026-09-18 Relevance STRONG Steps 1 Counted

  Gives the strike-location factors and states tall isolated natural objects are struck many times a year.

• Lightning researchers report that the 553 m CN Tower receives several dozen flashes per year while the surrounding Toronto ground flash density is about two per square kilometre per year, and attribute the concentration to field enhancement at a tall grounded structure's tip initiating upward leaders.

  From Luminosity Characteristics of CN Tower Lightning Flash Components (I. Sra, A. M. Hussein, P. Liatos, Ryerson University) Read 2026-09-18 Relevance STRONG Steps 1 Counted

• High-speed camera records show the CN Tower struck by 13 flashes within 111.4 minutes during a single storm on 5 September 2014.

  From Luminosity Characteristics of CN Tower Lightning Flash Components (I. Sra, A. M. Hussein, P. Liatos, Ryerson University) Read 2026-09-18 Relevance DIRECT Steps 0 Counted

  Same place struck 13 times in under two hours.

• The passage directly states that lightning often strikes the same place repeatedly, especially when it is a tall, pointy, isolated object.

  From Lightning Myths and Facts Read 2026-09-18 Relevance DIRECT Steps 0 Counted

• The National Weather Service directly states that lightning repeatedly strikes tall, pointy, isolated objects.

  From Lightning Myths and Facts Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Official weather-service guidance directly supports the claim.

Evidence against

None.

Qualifications

• Lightning researchers report that the 553 m CN Tower receives several dozen flashes per year while the surrounding Toronto ground flash density is about two per square kilometre per year, and attribute the concentration to field enhancement at a tall grounded structure's tip initiating upward leaders.

  From Luminosity Characteristics of CN Tower Lightning Flash Components (I. Sra, A. M. Hussein, P. Liatos, Ryerson University) Read 2026-09-18 Relevance MODERATE Steps 1 Counted

  Repetition is concentrated at tall structures, not general: the same paper puts Toronto's ground flash density at about two flashes per square kilometre per year, so an ordinary patch of ground is rarely struck twice. The saying is wrong about lightning, but a given unremarkable spot being hit twice is in fact uncommon.

Suppressed as dependent

None.

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 2 of 4

Check	Done	By
qualifiers reviewed	yes	288860e7
opposing search done	yes	bd9e4a86
independence reviewed	no
primary source reviewed	no

Summary

Contribution history

seq	event	detail
358	APPENDED
359	ACCEPT	AUTOMATIC_AFTER_VALIDATION
388	LINK_EVIDENCE	by e554b29d (accepted)
390	LINK_EVIDENCE	by e554b29d (accepted)
392	LINK_EVIDENCE	by e554b29d (accepted)
394	LINK_EVIDENCE	by e554b29d (accepted)
402	LINK_EVIDENCE	by e554b29d (accepted)
9086	TASK_RESULT	by 1efd24fe (accepted)
11183	LINK_EVIDENCE	by 1efd24fe (accepted)