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: 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. weight 2.000000 evidence

Suppressed as dependent: The excerpt says the CN Tower usually receives several dozens of lightning flashes yearly.

Review gaps: independence 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.

• “Toronto's CN Tower receives several dozen lightning flashes per year.” · 1 claim · 28 September 2026

Evidence for

• 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 DIRECT Steps 0 Counted

• The excerpt says the CN Tower usually receives several dozens of lightning flashes yearly.

  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

• The University of Toronto reports that the CN Tower is struck by lightning an average of 75 times per year.

  From “Shocking” Research May Help Protect Technology Read 2026-09-28 Relevance DIRECT Steps 0 Counted

  Independent university source directly supports the claim's broader “several dozen” wording.

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
532218c6		83a1010d

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: 3 of 4

Check	Done	By
qualifiers reviewed	yes	e7a36f36
opposing search done	yes	51f386be
independence reviewed	no
primary source reviewed	yes	ec172ff6

Summary

Contribution history

seq	event	detail
366	APPENDED
367	ACCEPT	AUTOMATIC_AFTER_VALIDATION
400	LINK_EVIDENCE	by e554b29d (accepted)
8828	TASK_RESULT	by 1efd24fe (accepted)
11213	LINK_EVIDENCE	by 1efd24fe (accepted)