February 18, 2013 - 7:09AM Brisbane is set to receive a drenching over the next 24 hours, with the weather bureau issuing a severe weather warning for heavy rain and possible flash flooding across southeast Queensland. The Bureau of Meteorology has warned a slow moving surface trough could dump between 100 and 200 millimetres of rain over Brisbane, Maroochydore, Gympie, Bundaberg, Gladstone and Mackay during Monday and Tuesday. The rain is expected to increase as the surface trough meets a low pressure system set to develop off the north Queensland coast. Towns as far north as Proserpine and Bowen are also set for a soaking. Bureau of Meteorology forecaster David Grant said the rain would likely set in from about midday in Brisbane. ""The showers we've had around for the last 24 hours will increase to rain during today,"" he said. ""From any time between about 9am and lunch time we'll probably see some rain developing. When that rain sets in, we'll probably see 24 totals of about 100 to 200 millimetres. ""We're still in the middle of the wet season really." Since 9am Sunday, parts of the Sunshine Coast have received more than 60 millimetres of rain, while much of Brisbane received about 10 millimetres. Everton Hills, in the city's north, received 13 millimetres, and the bayside suburb of Manly received 12 millimetres.