Genesis 7:4

For yet seven days, and I will cause it to rain upon the earth forty days and forty nights; and every living substance that I have made will I destroy from off the face of the earth.

1. The LORD gave Noah a seven day warning of the flood. Prior to this, Noah may not have know precisely when the flood would occur.
2. The flood was to destroy every living thing from the face of the earth.
3. The LORD knew when the flood would begin and how long the rain would last.
4. The LORD has control over the weather.
5. One of the roles of a prophet appears to be to receive advance notice of what the LORD plans to do that will impact the earth's inhabitants.