We will examine the development of Irene from hurricane to extra tropical storm. Key meteorological signals can be identified to explain the life cycle of the transition. We will use the example of Hurricane Irene to examine these key features which include

From satellite imagery:-

1. Reduction in organised convection in the inner core region
2. Asymmetric structure (Meteosat) with redistribution of precipitation towards baroclinic zone as frontal structure forms.
3. Tropical cyclone vortex weakening / rising surface pressure.
4. Strengthening jet / cloud streaks.

We will also examine surface and model data to aid in the diagnosis of key parameters :

1. Falling sea surface temperatures; Reduced evaporation / falling tropospheric humidities
2. Reduction in low/medium level +PV tower
3. Reduction of upper-level outflow circulation / -PV anomaly
4. Strong thermal advection warm right of track, cold left
5. Increasing baroclinicity / perturbations / baroclinic wave formation.
6. Expanding surface wind field.

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