Fukushima prefecture received SPEEDI data from 23:54 of 3/12/2011 to 9:45 of 3/16/2011.[Link]
They received emails to contain SPEEDI data 86 times from Japanese government, but they abandoned the data without informing the citizens, which is because their inbox was full supposedly.
However, they actually saved 20 emails by USB, and 15 of them were the ones from 1 hour before reactor3 exploded.
The saved data contain the simulation of radiation spread of 1 and 2 hours later than it was computed, so the saved data in USB covered the simulation of radiation spread after reactor3 actually exploded. They abandoned the emails but saved it by their own USB.
Reactor3 had the explosion at 11:01 of 3/14/2011. Fukushima prefecture saved the data from the one computed at 10:00 of 3/14/2011, which simulated the radiation spread of 11:00 ~ 12:00, to the one computed at 2:00 of 3/15/2011 almost continuously. (The ones of 16:00 and 17:00 were skipped.)
↓ The data in the abandoned email but saved by their own USB
Iori Mochizuki