CACrown ArchivesThe cinema collection
EN/FR
Search
Menu
Research dossier · General Reference

London tornado of 1091

One of the strongest tornadoes in British Isles

Cross-disciplinary reference desk with index cards, atlas, dictionary and catalogue
General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionJul 2, 2026
Entity authoritySource title only
Source-derived summary

The London Tornado of 1091 is the earliest reported tornado in England, occurring in London on Friday, 17 October 1091. It has been estimated by modern assessment as possibly a T8 on the TORRO scale, making it one of the strongest recorded tornadoes in the British Isles, alongside the 1666 Lincolnshire tornado, although this estimate is based on reports written 30 years later.

Editorial summary

Begin with the source’s own compact description: “London tornado of 1091” is one of the strongest tornadoes in British Isles. The dossier treats that line as a proposition to test through London, tornado and strongest, not as a finished interpretation.

Editorial reviewA practical starting point whose main value is the path it opens into stronger specialist and primary sources. The current lead gives the account dated anchors—1091, 1666—that can be checked directly. The selected authority fields contribute no independent date. For this dossier, London, tornado and strongest is the immediate research focus.
Editorial analysis

Why this record matters

The phrase “one of the strongest tornadoes in British Isles” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.

Evidence profile

Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jul 2, 2026. The first chronological checks are 1091 and 1666.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “London tornado of 1091”, its source revision and the description used here.
  2. Expand the search: follow London tornado of 1091 primary sources, London tornado of 1091 archive and London research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “London tornado of 1091”?
  2. Which cited source is closest to the event, object or claim?
  3. What terminology or title could unlock a more precise catalogue search?
Subject index

Search terms from this dossier

Source & attribution

This entry incorporates text from “London tornado of 1091” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.