Offshore windows, across the years.
Explore ERA5 wind and waves at a fictional offshore site, then compare an illustrative Brest handling phase with site work in the 2024 replay.
Historical screen · no departure recommendationWhen does the sea allow offshore work?
A retrospective view of continuous offshore windows, month by month and year by year. Change the limits to recalculate every hourly start across the entire series.
Seasonal window pattern
Share of documented hourly starts whose full duration meets both Hs and wind limits. A window may continue into the following month.
June
21,670 compatible starts / 33,840 documented starts
Year-to-year variability
Each point is that month’s rate in one reanalysis year; the line shows the range, not a confidence interval.
Two-point replay · 2024
This replay adds an illustrative 6-hour handling phase in Brest and a conventional 24-hour offset before the site criterion. The offset is neither a towing duration nor a towing weather assessment.
UTC markers for a historical screen; no towing route or duration is modelled.
Define the scenario
Illustrative thresholds and durations, without operational validation.
Regional ERA5 proxy about 13.47 km from the indicative polder marker; this is not a terminal measurement.
Compatible historical hours
Brest wind for 6 hours, then site Hs and wind after a conventional 24-hour offset. Towing weather is not assessed.
Three criteria, one UTC axis
Cyan bands indicate compatible historical hours. Cursor values correspond to the reference hour; the site is assessed 24 hours later.
Hourly periods to review
Consecutive reference hours are grouped; the longest periods appear first. This ranking does not recommend a departure.
What this demo represents
This historical screen does not recommend a departure. The 6-hour Brest phase represents illustrative preparation and handling, not full assembly. Wind comes from a regional ERA5 grid point and does not measure conditions at the terminal. The fixed 24-hour offset between phases is neither a towing duration nor a towing weather assessment. Tides, currents, nearshore sea state, vessel response and operational limits are outside the model. The site north of Roscoff is fictional and does not represent any real project. ERA5 grids: waves 0.5°, wind 0.25°.
Source and reuse
ERA5 2024 data: Copernicus Climate Change Service (C3S). Both point series were extracted, quantized and compressed for this demo. CC BY 4.0 licence. Neither the European Commission nor ECMWF is responsible for this use.