There's a warning of severe thunderstorms in the ACT on Tuesday evening.

The Bureau of Meteorology says that they could "produce heavy rainfall that may lead to flash flooding and damaging winds over the next several hours".

The bureau has issued a severe thunderstorm warning for Canberra.

The area affected extends beyond the ACT to the Snowy Mountains and parts of the South Coast, Southern Tablelands, South West Slopes and Riverina districts.

The bureau warning said, "Locations which may be affected include Canberra, Cooma, Bombala, Wagga Wagga, Tumbarumba, Narrandera, Tumut, Khancoban, Junee, Holbrook, Lockhart and Darlington Point."

The State Emergency Service advised that people should: