Know your best sites before the mast goes up

Screen, compare, and shortlist candidate sites with 21 years of mesoscale wind data - instantly, at any location.

Whiffle Atlas is trusted by industry leaders

Screen every candidate site on data you can trust.

Today's development pipeline is increasingly dominated by mixed and complex terrain. With no measurements on site, you're relying on a long-term reference dataset to rank them. If that dataset carries terrain-dependent bias, it doesn't just add uncertainty, it can change which sites make the shortlist.
Whiffle Atlas is generated by the Whiffle Meso model at 2 km resolution, resolving land–sea transitions, orographic acceleration, regional wind speed gradients, and mesoscale circulation patterns that coarser reanalysis cannot capture, giving you a more accurate wind climatology at the sites that matter, before a mast goes up.

Evaluate Whiffle Atlas with a 30-day trial

Create a free account to access Whiffle Atlas for 30 days. During the trial, you can download up to five mesoscale datasets at locations of your choice. Use the trial period to compare candidate sites, validate our data, and test integration within your wind resource workflows.

Whiffle Atlas is currently available for Europe, the US, Australia, Japan, and Korea, with additional regions in development. Pick any site in these regions for your free trial, or request coverage for a location you don’t see yet.

A near-zero mean wind speed bias
and narrow error spread

Whiffle Atlas is generated by the Whiffle Meso model and has been rigorously benchmarked across 108 sites, globally. Locations include RWE, GE, Orsted and public data, with some sites containing more than one measurement location.

Results show:

a mean wind speed bias of 0.092 m/s
standard deviation of 0.64 m/s.

Critically, this performance holds across all terrain classes. Where reanalysis products like ERA5 show their largest systematic underestimation (complex terrain), Whiffle Atlas median bias remains close to zero. Bias spread increases with terrain complexity for both datasets, but scatter stays consistently below ERA5 across every class, from offshore to complex terrain.

"A major step forward in long-term wind modelling"

"Atlas is a major step forward in long-term wind modelling – driving deeper understanding of long term trends for projects dominated by mesoscale effects and terrain induced complex flows. Alongside the Whiffle LES model, it has improved the consistency and accuracy of our predictions, reducing uncertainty in our wind resource assessments, and helping reduce long term project risk."

-Jeffrey Snyder, Snr Wind Resource Analyst (GE Vernova)

From statistics to full wind climate characterisation

Check site potential before you download any data

Enter any coordinates and inspect 21-year wind statistics — wind rose, Weibull distribution, and vertical shear profile — directly in the Analytics tab, instantly and for free. Only download the sites that make your shortlist.

Full vertical profile. Every stability indicator. One download.

Every Whiffle Atlas time series download includes hourly data at 10 fixed heights from 2 m to 500 m: wind speed, wind direction, air density, pressure, temperature, boundary layer height, TKE, Richardson number, Obukhov length, and vertical shear. Everything you need to quantify vertical shear variability and characterise atmospheric stability at any site.

Priced for the scale you're working at

At €450 per site, access is straightforward and scalable. Volume discounts and flat-rate regional bundles are available for consultants and developers screening across markets: the more sites you screen, the lower the cost per dataset. Export in NetCDF or CSV, ready for WindPRO, OpenWind, or your own toolchain. API access available.

Access options

Whiffle Atlas is accessible via a UI or API. Integration with partner apps coming soon.

Web application

Log-in to the Whiffle Atlas web application, enter your site coordinates and get your data in seconds.

API Client

Whiffle Atlas is available programmatically through our REST API – with an official Python SDK for developers.

Pricing

From free trials to portfolio-scale access – choose the plan that fits your workflow.

Free trial

Per-site lookup

Discounts

Frequently Asked Questions

What is Whiffle Atlas?

Whiffle Atlas is a validated, precomputed, mesoscale dataset offering 21-year hourly wind time series at 2 km resolution across 10 heights (2m –500 m). Ideal for early-stage screening, it’s instantly downloadable and available today for Europe, the US, Australia, Japan, and Korea.

How is Whiffle Atlas different from ERA5, GWA, or other mesoscale datasets?

Whiffle Atlas provides finer spatial resolution (2 km), is precomputed, directly downloadable at 10 heights (from 2m to 500m), and validated against over 300 met masts globally.

What sets Atlas apart is its performance: across validation campaigns, it shows lower wind speed bias and higher correlation to measurements than other mesoscale datasets. That means reduced uncertainty in long-term wind estimates, especially in nearshore zones, coastal areas, and complex terrain where global models tend to underperform.

Use Atlas as an additional reference in your MCP, alongside ERA5, or as a faster alternative to traditional on-demand mesoscale simulations.

What is the Whiffle Meso model?

The Whiffle Meso model is Whiffle’s in-house mesoscale weather model, developed alongside its LES model. Like LES, it is a physics-based numerical model but it operates at a coarser horizontal resolution of 2 km. While it does not resolve turbulence directly (as turbulence is typically smaller than 1 km), it uses physical parametrisations to capture the net effects of turbulence on atmospheric flow.

This makes the Whiffle Meso model well-suited to resolve larger-scale phenomena like coastal transitions, regional wind gradients, and sea breezes. It is used both as a pre-driver for LES simulations and as a standalone engine for generating long-term wind climatologies – as in Whiffle Atlas. This allows for cost-effective coverage of large spatial domains and multi-decade timeframes.

What do I get with my Whiffle Atlas free trial?

Five site lookups: 21-year, hourly wind datasets at 10 heights for any location in the available regions. No credit card, no setup required.

Can i use Whiffle Atlas for...?

Measure-Correlate-Predict (MCP)?
✅ Yes – You can download long-term, hourly time series at mast or LiDAR locations for bias correction.

Horizontal extrapolation across turbine sites?
⚠️ Limited – Atlas can show wind gradients at 2 km resolution, which is useful for early-stage prospecting. For layout-level extrapolation, use Whiffle Wind WRGs.

Site-specific fine-scale flow modelling?
❌ No – For flow modelling at turbine level or within complex terrain, use Whiffle Wind’s LES simulations at 100 m resolution or finer.

Offshore site screening?
✅ Yes – Atlas provides a long-term wind reference across offshore clusters or lease zones where measurements are sparse or unavailable.

What is the horizontal and vertical resolution?

Horizontal: 2km × 2 km grid.

Vertical: 2 m, 10 m, 50 m, 100 m, 150 m, 200 m, 250 m, 300 m, 400 m, and 500 m above ground level

What data do i get per location?

20 years of hourly values at 2m, 10m, 50m, 100m, 150m, 200m, 250m, 300m, 400m, 500 m. The meteorological variables included are wind speed, wind direction, vertical velocity, air density, pressure, surface pressure, temperature, surface temperature, relative humidity, boundary layer height, turbulence kinetic energy, Brunt-Väisälä frequency squared, vertical shear squared, Richardson number, inverse Obukhov length.

Is Whiffle Atlas output raw LES output?

No. Atlas is based on the Whiffle Meso model (mesoscale). For raw LES at 100 m resolution, use Whiffle Wind.

How is pricing structured?

You can start for free, no credit card required. Every user gets 5 free dataset downloads to test Whiffle Atlas on their own sites.

After that, access is simple and scalable:

€450 per site download
Discounted rates available for bulk lookups, regional coverage, or portfolio subscriptions

Whether you need data for one project or dozens, there’s a plan that fits.

Can I access the data programmatically?

Yes, via the Whiffle Python client: whiffle-client on PyPI.

The region I'm looking at isn’t available. Can I request a custom tile?

Yes. Whiffle Atlas currently covers Europe, the United States, Australia, Japan, and Korea — with more regions in development. If your project site falls outside these areas, reach out to us directly via support@whiffle.nl. Custom regions can often be added based on demand or generated upon request.

Can I preview the dataset before downloading it?

Not yet, but this feature is planned to be released soon.

Can i choose a custom time period?

No. By default Atlas delivers the time series for the last 21 whole years, which currently is 2004-2025.

What formats can i export the data in?

Time series output in .csv and .netCDF are available today. Statistical and gridded output in the form of a WRG export is in development.

Is Whiffle Atlas suitable for offshore wind projects?

Yes, particularly for extrapolation across turbine clusters and regions with sparse measurement coverage.

Does Whiffle Atlas include terrain or land cover effects?

Yes. The Whiffle Meso model accounts for terrain and land–sea transitions at 2 km scale, improving representativeness compared to coarser reanalysis.

How do i start a Whiffle Atlas free trial?

You can get started with creating your account, by filling in this form.

Contact

Whiffle
Molengraaffsingel 8
2629 JD Delft