AL061870 | 1870 season

Twin Key West (I)

Pre-ONI 1FL impact Major Hurricane (Cat 3+) Rapid Intensification

Formed: 1870-10-05
Dissipated: 1870-10-14
Peak wind: 100 kt
Lifetime category: 3
Min pressure: 959 mb (lifetime)
Florida date: 1870-10-09
Approach: atlantic
FL regions: SW1 SE1
Center landfall: no
ENSO (ASO ONI): pre-1950, no ONI
Peak surge (FL): none exists for this era

Surge: no curated record, and none is likely to exist. Reliable landfall-zone surge observation generally predates neither the modern gauge network nor NHC Tropical Cyclone Reports for storms of this era; surge comparisons on this site skew modern as a result (disclosed on the methodology page).

Track

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below hurricane strength
Cat 1
Cat 2
Cat 3
Cat 4
Cat 5
first track point
landfall (HURDAT2 L record, colored by intensity there)
Florida-relevant point (strongest fix on the FL impact date)
Florida Straits / Cuba shelf corridor (where track wobble is measured)

HURDAT2 best track. Coastline is stylized for orientation, not a boundary source.

Compare this track to other storms →

Intensity

Maximum sustained wind over the storm lifetime, with Saffir-Simpson thresholds and the Florida-relevant date marked. All values from HURDAT2.

Official Sources

No per-storm graphical track exists for storms before 1995.

How This Record Was Built

join: pressure_match | confidence: high | pressure diff: 11mb | enrichment v1.3.0 | status: machine_enriched

Impact facts from the NOAA Continental US Hurricane Impacts table; track and intensity from NOAA HURDAT2; ENSO phase from CPC ONI. Full rules on the methodology page.