Cyclone phase evolution: Analyses & Forecasts

This page presents historical, analyzed (current), and model-forecast cyclone phase diagrams for northwestern hemisphere cyclones
with the goals of improved structural forecasting, structural transition (subtropical/tropical/extratropical), cyclogenesis, and providing measures of structural predictability.

Please note that these products are experimental and not official forecasts. For official forecasts in the U.S., please refer to the National Weather Service and National Hurricane Center.

To the right are the most recently picked interesting diagrams.
In this case, the GEFS ensemble forecast of hurricane Ernesto's ET following Bermuda landfall.



Latest deterministic model output:
CMC: 2026052600 ECMWF: 2026092706
GFS: 2026092706 JMA: 2026092706
NAVGEM: 2026092706 UKMET: 2026092700

Current/recent NCEP HWRF model output:
eighteen18e:2026092706 gonzalo07l:2026092606
invest90e:2026092700 nolo15e:2026092706
polo17e:2026092706

Current/recent NCEP HMON model output:
No recent NCEP HMON runs

Current/recent CIRA/NESDIS AMSU based diagrams:
No recent AMSU retrievals

Ensemble output:
Latest deterministic intercomparison: [ 2026010412 | 2026010406 ]

Latest CMC Ensemble: [ 2026092700 | 2026092612 ]

Latest GFS Ensemble: [ 2026092700 | 2026092612 ]

Latest NGP Ensemble: [ 2026092700 | 2026092612 ]

Latest CMC+GFS+NGP Ensemble: [ 2026092700 | 2026092612 ]


Example phase diagrams from past events: [View]

Help/Docs: [ Docs | AMS02-ppt | AMS02Talk-ppt ]


Page created and maintained by:

Robert Hart
Florida State University


This page last updated: Sun Sep 27 16:40:03 UTC 2026