Here is the forecast: An outbreak of offensive gestures, followed by severe embarrassment, with the possibility thunderous words from the boss.
BBC News Channel viewers saw weatherman Tomasz Schafernaker brazenly sticking his middle-finger up at breakfast show presenters Simon McCoy and Fiona Armstrong, who were off-camera. Prior to the gaffe, caught live on BBC News24, anchor Simon McCoy seemed to gently poke fun at Schafernaker by saying: 'Now we will have the weather forecast in a minute and or course it will be 100 per cent accurate and provide all the detail you can possibly want.
'I've just seen Tom Schafernaker preparing for it.'
At this point, the camera pans to the Polish-born weatherman, who reacted to the sarcastic tone by sticking his middle finger up before suddenly realising he is on camera.
He then proceeds to try and disguise the blunder by scratching his chin. A gasp can be heard before McCoy quips: 'There's always one mistake. That was it.' This is not the first time Schafernaker, 31, has found himself in hot water.
Last year he stumbled over his words and forecast a 'muddy sh*te' for the Glastonbury festival.
He was also forced to apologise in 2007 after referring to the Outer Hebrides in the Western Isles of Scotland as 'nowheresville.' In May 2008 a clearly unimpressed Schafernaker tore his earpiece out after proclaiming 'Well I don't know if I'm on air or not so Gary over to you.'
A BBC spokesman said: 'Tomasz was not aware that he was on air, and whilst the gesture was only shown for a second, it was not acceptable.
'The News Channel presenter live in the studio acknowledged a mistake had been made, and we apologise for any offence caused.' Ed Taylor, a spokesperson for Ofcom, said there had been no complaints about the incident.