Extremes & Records
Extreme weather events have always drawn attention, but what counts as an “extreme” depends on how weather is measured, recorded, and interpreted. Records are not simply lists of the largest or strongest events; they are historical artifacts shaped by observation practices, available instruments, and reporting systems.
This section examines how weather extremes came to be defined, measured, and ranked, and how those records reflect both atmospheric reality and the limits of the data used to describe it.
What “Extremes & Records” Means Here
Meteorological records are inseparable from the history of observation. A record can exist only where measurements are made, preserved, and compared.
In this section, “Extremes & Records” includes:
• Historical records of extreme weather events
• The development of criteria for defining meteorological extremes
• Changes in measurement techniques that altered record-keeping
• The role of standardization and revision in maintaining records
Rather than presenting extremes as absolute facts, this section treats them as context-dependent outcomes of measurement and classification.
Time Period Covered
Material in this section spans the period during which systematic record-keeping became possible and meaningful.
Broadly, it includes:
• Early anecdotal and qualitative reports of extreme events
• The emergence of instrumental records and standardized thresholds
• Twentieth-century efforts to compile, revise, and compare extremes
• Ongoing reevaluation of historical records as methods improve
Modern records are considered alongside their historical foundations, not in isolation.
What You’ll Find in This Section
• The origins of meteorological record-keeping
• Criteria used to define extremes such as wind speed, rainfall, and damage
• The influence of observation density and instrumentation on records
• Revisions, disputes, and uncertainties surrounding historical extremes
These entries emphasize how records are created, maintained, and occasionally overturned.
Featured Entries
(Entries will be added as research is completed.)
How This Section Connects to the Archive
Extremes and records intersect with several other areas of the archive:
• Instruments & Observations, which determine what can be measured
• Institutions & Networks, which collect and verify records
• Maps & Charts, which visualize extreme events spatially
• Forecasting & Theory, which seeks to explain why extremes occur
Understanding records requires viewing them as part of a broader system of measurement and interpretation.
A Note on Sources and Interpretation
Records of extreme weather are often revised as new evidence, improved methods, or reanalysis becomes available. Entries in this section draw from official datasets, historical documentation, and scholarly analysis, noting uncertainty where it exists.
Where comparisons across time are difficult or misleading, those limitations are explicitly discussed rather than minimized.