Nahum 1:3

The Lord is slow to anger, and great in power, and will not at all acquit the wicked: the Lord hath his way in the whirlwind and in the storm, and the clouds are the dust of His feet. Nahum 1:3

This picture was taken by my brother from CopenHagen. I am pretty sure you have noticed the trail of clouds that seem to meet the bright light at the end of the road. Looks like God has been walking this part of the Earth:). You can see the clouds. To me, they are the dust of His feet.

God is a long-suffering God. He is not willing that any should perish but that all come for repentence. Hence, He is slow to anger. Take the e.g of Jonah:

This is Nineveh. God spared Nineveh when they repented of their sins even though they were very sinful. Nuhum is re-echoing what Jonah says in Jonah 4:2 where he says the Lord is "slow to anger". God is long-suffering and this also shows His great power. However, though God is merciful and loving, He is Holy. Hence, He cannot stand the wicked and they must be punished if they refuse to repent of their sins. Psalms 7:12-13, 2 Peter 3:9-10.

The vengeance of the Lord comes at swiftly, vehemently, fearfully, irresistibly- 1 Thess 5:3 This is what it is meant when Nahum said that the Lord hath his way in the whirlwind and in the storm.

And the clouds are the dust of His feet - the image is from the light dust raised by an earthly army- Ezekial 26:10. Taken from http://barnes.biblecommenter.com/nahum/1.htm.

And so, as seen, lots can be said on 1 verse:D. I realise that reading the Bible is like finding little bits of treasure and gold. Everyday, you gain more gold and understanding. It amounts to a lot and it helps you when you are in danger-danger of sin and temptation. So, it is ALWAYS important to hide God's Word in our hearts:)