Are storms evil? No. Storms happen because they are keeping the law. There are laws in nature that determine when it rains, snows, hails, when the wind blows and how hard, where the lightening strikes or tornadoes form. These things, in themselves, are not evil, though they can bring great destruction; nor are they necessarily good, though they can bring good and needful things to the earth. However, storms can be used for evil, or they can lead to great good. 

When a storm produces destruction, we see one of two things come from those effected: 
Some come out to take advantage of others out of selfishness and avarice. 
Others come, even out of their own extreme poverty, to help those in need and to build anew. 
I read a devotional that eluded to this passage of scripture and the purpose for Christ expressed here:
“Everyone who practices sin also practices lawlessness; and sin is lawlessness. You know that He appeared in order to take away sins; and in Him there is no sin. 
“No one who ABIDES in Him sins; no one who sins has seen Him or knows Him. Little children, make sure no one deceives you; the one who PRACTICES righteousness (as a deliberate and habitual action of choice out of love for God and allegiance to Jesus) is righteous, just as He is righteous; the one who PRACTICES sin (as a deliberate and habitual action of choice, which is rebellion against God and His chosen King) is of the devil; for the devil has sinned from the beginning. 
“The Son of God appeared for this purpose, to destroy the works of the devil (sin and all that stands in opposition to God, His will, His way, His sovereignty). No one who is born of God practices sin, because His seed abides in him; and he cannot sin, because he is born of God.” 1 John ‭3:4-9‬ ‭NASB‬ (my understanding)
The storm is not evil or good: but the force behind it and the spirit it brings can produce great evil, or healing balms of good through the actions and reactions of people effected by the storm. A person reveals his heart in such seasons. 
Jesus came to destroy the work of Satan that leads people to do the evil seen in such times. With Job, when His children were killed in a tornado, the purpose of Satan and the trap of temptation set by him was to prove Job would lose faith in God and rebel against Him. That is what Satan seeks to accomplish through the storms of life. 
“The thief comes only to steal and kill and destroy; I came that they may have life, and have it abundantly.” John ‭10:10‬ ‭NASB‬
To die, in God’s value of things, is to turn away from Him in lack of faith to trust Him in the storm. It is to rebel against Him out of anger, self-centeredness, pride, greed, or any number of evils that get a controlling hold on our hearts and lead us to turn against God’s way. 
Life, in God’s economy, is this relationship with Him from a heart that trusts and follows Him despite the tricks of the devil. We don’t easily and habitually give in to temptations to sin out of fear or because of stressors to faith in God. We stand with God and for God, no matter the length of our waiting for His hand to move, and we find Him faithful. This is the Life, abundant and full, that Jesus provides. 
The abundance Jesus provides is peace beyond measure; joy unrelated to circumstance; faith fed by deep pools of belief’s hope; and a River of love flowing to and through us, all fed by God, who is love. Evil that seeks destruction cannot win when God’s people stand firmly planted on Him. 
“Do not fret because of evildoers, Be not envious toward wrongdoers. For they will wither quickly like the grass And fade like the green herb. Trust in the LORD and do good; Dwell in the land and cultivate faithfulness. Delight yourself in the LORD; And He will give you the desires of your heart. Commit your way to the LORD, Trust also in Him, and He will do it. He will bring forth your righteousness as the light And your judgment as the noonday. Rest in the LORD and wait patiently for Him; Do not fret because of him who prospers in his way, Because of the man who carries out wicked schemes. Cease from anger and forsake wrath; Do not fret; it leads only to evildoing. For evildoers will be cut off, But those who wait for the LORD, they will inherit the land.” Psalms ‭37:1-9‬ ‭NASB‬
“My son, do not forget my teaching, But let your heart keep my commandments; For length of days and years of life And peace they will add to you. Do not let kindness and truth leave you; Bind them around your neck, Write them on the tablet of your heart. So you will find favor and good repute In the sight of God and man. Trust in the LORD with all your heart And do not lean on your own understanding. In all your ways acknowledge Him, And He will make your paths straight. Do not be wise in your own eyes; Fear the LORD and turn away from evil. It will be healing to your body And refreshment to your bones.” Proverbs ‭3:1-8‬ ‭NASB‬
‭Yes, Satan used a storm and other devastations in Job’s life, intending it for evil; but God allowed it, knowing it would produce the good He desired. The question is, on which side of the equation will we stand? ‬