We are just back too!
We did Mission Space which was awesome, altough my daughtrer (age 6) was quesy for an hour afterwards. It is definatley an intense experience. ESPCIALLY the take-off.
As for the rain, when watching the weather channle, if there is ANY possiblity of rain listed then it will will definately rain.
It rained everyday but one while we were there (8/13-8/20) Luckily the day it didnt rain we had scheduled Typhoon Lagoon (our favorite water park) Everyone else came to that day because it was packed.
And the rain wasnt just a little sprkinle, it usually was a downpour that lasted for hours.
On 8/14 it rained pretty much all day-although it was only sprinkles with occasional downpours.
8/15-started raining at 1pm and continued until 4pm
8/16-Absolute downpour at 4pm until 5pm, then okay
8/17-NO RAIN!!
8/18-FLOODING AND RAIN atarting at 5pm all through the night, torando warnings
8/19-POURING around 1pm until 7pm
We gave up on the ponchos and just got wet. The ponchos were a pain because they insist that you take them off on the rides.