National storm forecasters ratcheted up their prediction for a strong hurricane season Wednesday, estimating as many as five major Atlantic hurricanes. The update comes just as the season is reaching its period of peak activity.

Forecasters from the National Oceanic and Atmospheric Administration (NOAA) cited a flurry of early season storms, wind and air patterns and high sea-surface temperatures in the Atlantic among the reasons for the heightened forecast. There have been six named Atlantic storms so far this season, double the average number. NOAA now says there is a 60% chance of an above-normal season, compared to…