2012 Atlantic hurricane forecast raised to 13 tropical storms

Colorado State University researches have raised the 2012 Atlantic hurricane season forecast to 13 tropical storms, with five hurricanes and two 'major' hurricanes, Reuters reports. 

The university said that the forecast was raised due to uncertainty as to whether El Nino will form. 

The April forecast predicted 10 tropical storms, with four strengthening into hurricanes and two becoming major hurricanes, Reuters reports. 

The six month season began on Friday.