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Remember that if the forecast time is changed, the storm centres will move and the cross-section line will need to be repositioned to follow specific features. This is not computed automatically, but must be changed by altering the coordinates above.

Exercise 2:

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Operational ECMWF HRES forecast

Forecast performance

Exercise 1 looked at the synoptic development up to the 20-Sept-2012. This exercise looks at the ECMWF HRES forecast from this date and how the IFS model developed the interaction between Hurricane Nadine and the cut-off low.

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Task 1: Synoptic development

From 20th to 25th September, Nadine had lost hurricane intensity and was slowly moving over the North Atlantic. A short-wave trough separated into a cutoff and approached from the north. Nadine interacted with a cold front associated with the cutoff on 21st September.

Task 3: Precipitation over France

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