The Hot-Dry-Windy Index (HDWI)

Major Update!

The Hot-Dry-Windy Index has a new home at Please update your bookmarks to the new site. We've been working with the U.S. Forest Service to build a more stable platform for HDWI, and we're happy to announce that it's ready to use.

Advantages of the new site:

Faster Processing: The new infrastructure from the USFS and cloud-based Amazon Web Services (AWS) will allow HDWI products to be available two hours earlier than our previous workflow.

More Stable: The AWS server is expected to be much more reliable than the old server, and the update should reduce (or eliminate) the types of disruptions that occurred in recent months.

If you have bookmarks that point to (this site) or to (for specific images), please update them to the new site.

Going forward, this website ( will be used as a development sandbox for new/experimental HDWI-based products. If you would like to see what we are working on, please use the following link (coming soon): We plan to halt regular, daily processing of HDWI products on this site soon.

Finally, if you have any questions or comments, please contact us at,, and/or Thanks for your support of the Hot-Dry-Windy Index!