"Very squally showers are also expected such that isolated gusts of 70-75 miles per hour are also possible further inland in the Amber warning area [West Sussex, Kent, Brighton and Hove, East Sussex, Isle of Wight]".
Drivers should be extra cautious of flooding and falling debris from trees, the Met Office said.
The Met Office has issued an amber warning - meaning "be prepared" - for coastal areas from the Isle of Wight eastwards, including Kent and Sussex, which are expected to see gusts reaching up to 80mph.
Forecasters are warning of possible localising flooding.
Residents are being told to brace themselves for power cuts, travel disruptions and possible destruction to buildings.
Storm Angus is expected to sweep through south-eastern England bringing some very strong south-westerly winds and heavy rain to affected parts through Sunday morning.
It said the storm had brought over an inch of rain in south-western areas, with Exeter seeing 10mm in one hour.
"A vigorous area of low pressure, now named Storm Angus, will move northeast across southern and southeast England on Sunday".
But gusts of between 70 and 80mph in the worst hit areas are of greatest concern as the first storm threatens to bring down weak tree branches.
Mr. Partridge said it was the first storm this season and that it had come quite late, considering it is already November.
'This will be a bit of a shock to the system for most people in terms of wind and rainfall'.
Southerly, then south westerly gales are likely with storm force winds developing over the English Channel.
Northern areas of England should expect more cold weather, however, the winds will be fairly light and the skies clear.
Despite a dry, if a little blustery, afternoon being forecast for tomorrow, Monday morning commuters face "a second band of heavy rain coming from the south on Sunday night" that will rain hard over London and the M4 corridor.