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: 2026082100
GFS: 2026082106 JMA: 2026082106
NAVGEM: 2026082100 UKMET: 2026082100

Current/recent NCEP HWRF model output:
invest90e:2026082006 invest91e:2026082106
lala01c:2026082106 saudel17w:2026082018
two02c:2026082106

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: [ 2026082012 | 2026082000 ]

Latest GFS Ensemble: [ 2026082100 | 2026082012 ]

Latest NGP Ensemble: [ 2026082100 | 2026082012 ]

Latest CMC+GFS+NGP Ensemble: [ 2026082012 | 2026082000 ]


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: Fri Aug 21 12:50:02 UTC 2026