The Bureau of Meteorology has issued a severe thunderstorm warning for parts of the region, including Rochester, Lockington, Elmore, Fairy Dell and Timmering.
The advice, issued at 3.06pm, states a deepening trough over western Victoria and a very moist airmass is bringing a severe thunderstorm risk across large parts of the state this afternoon.
Severe thunderstorms are likely to produce heavy rainfall that may lead to flash flooding, damaging winds and large hailstones in the warning area over the next several hours.
Locations which may be affected include Kerang, Bendigo, Rochester, Seymour, Castlemaine and Kyneton.
The State Emergency Service advises that people should:
* If driving conditions are dangerous, safely pull over away from trees, drains, low-lying areas and floodwater. Avoid travel if possible.
* Stay safe by avoiding dangerous hazards, such as floodwater, mud, debris, damaged roads and fallen trees.
* Be aware - heat, fire or recent storms may make trees unstable and more likely to fall when it's windy or wet.
* Check that loose items, such as outdoor settings, umbrellas and trampolines are safely secured. Move vehicles under cover or away from trees.* Stay indoors and away from windows.
* If outdoors, move to a safe place indoors. Stay away from trees, drains, gutters, creeks and waterways.
* Stay away from fallen powerlines - always assume they are live.
* Be aware that in fire affected areas, rainfall run-off into waterways may contain debris such as ash, soil, trees and rocks. Heavy rainfall may also increase the potential for landslides and debris across roads.
The next warning is due to be issued by 6:10 pm.