Each year the Japan Weather Association issues a Forecast for the Cherry Blossoms across Japan. Since Sakura or Cherry Blossom is one of the most important things in Japan, many people await this forecast eagerly to plan their Hanami Parties and Cherry Blossom viewing trips.
The detailed forecast for 2014 is available at this link : Sakura Forecast for 2014
The website also has recommended blossom viewing spots and the exact status of the blossoms.
So start planning your trips and hanami parties !