Steering Index and Activity Index
Real-Time Product for North Atlantic Tropical Cyclones
Please read the Product Description prior to use
Updates daily once 00 UTC runs are post-processed (generally by 2000 UTC): See Archive
Research on this page is sponsored by Aeolus Capital Management, Ltd.
Extended Forecasts: overlayed ensembles
GEFS: 35 days
EPS : 15 days
GEPS: 16 days (32 days on Thursdays)
Click here for a truncated SI outlook (out to 16 days)
Click here for a truncated AI outlook (out to 16 days)
Extended Forecasts: Combined-Ensemble mean (GEFS+EPS+GEPS)
GEFS: 35 days
EPS : 15 days
GEPS: 16 days (32 days on Thursdays)
Click here for a truncated SI Combined-Mean outlook (out to 16 days)
Click here for a truncated AI Combined-Mean outlook (out to 16 days)
AI x SI Outlook Visualization: Combined-Ensemble mean (GEFS+EPS+GEPS)
GEFS: 35 days
EPS : 15 days
GEPS: 16 days (32 days on Thursdays)
Click here for a 0–15 day AIxSI Combined-Mean outlook
Click here for a 0–35 day AIxSI Combined-Mean outlook
DISCLAIMER: The current versions of SI and AI shown herein are experimental and should be treated as such. Please seek information from the National Hurricane Center to help with any decision making.
Current Activity
- (Plot by Tomer Burg; click to enlarge)
- The best site to visit for tropical Atlantic warnings and forecasts is the National Hurricane Center. For storm and invest ensemble track forecasts, both Tomer Burg's Real Time TC Page and Weathernerds.org are great resources.
SI by Ensemble
GEFS Trend
EPS Trend
GEPS Trend
AI by Ensemble
GEFS Trend
EPS Trend
GEPS Trend
