when will Yufuin No mori resume operation?

Hi, we are tourists. We'll go to kyushu early Aug .I heard that Yufuin No Mori are not operating now because of extreme rainfall last week .We'd like to know when this train will resume operation ?? Other trains are running normally, right ? Is Everything back to normal?? We concern that it will be affected our trip . Thanksssss

The date has not been decided, and I suspect that it won't be back in service by early August. Fortunately, there are many other ways to access Yufuin besides the Yufuin no mori.

You will be able to see daily updates of the situation here:
http://www.japan-guide.com/e/e4750.html

Is Everything back to normal?

Yufuin was not affected apart from the above mentioned access issues.

There are shuttle buses between Chikugo Yoshii and Hita. Ask for the temporary time table.
Alternate way to Yufuin from Hakata is to go to Kokura and down to Beppu, then to Yufuin on Yufuin no mori or Yufu Ltd Express. Again ask the temporary train schedule.
Also Cross Kyushu Ltd Express train between Kumamoto and Beppu is not operating. Also Asoboy! is not operating.

If Yufuin can't be resume operation soon ,pls let me know other ways( both trains and buses) to access Yufuin from Fukuoka . thanksssss
Is Kyushu Shinkansen ( Sakura- from hakata station ) that passing Kumamoto running normally ??

I recommend to travel by direct highway bus:
http://www.nishitetsu.co.jp/bus/highway/gb/guide/yufuin.htm

Or by train via Kokura and Beppu/Oita.