Help with this script?

I was trying to do this because I made the script and when the storms transparency changed the gui text and text color did not I had to reset for it to update. Please help. I will give you the code here it should be simple.

local letters = script.Parent
local storm = game.Workspace.Storm

if storm.Transparency == 0 then
	letters.TextColor3 = Color3.new(255,0,0)
	letters.Text = "Rain Showers"
end

if storm.Transparency == 1 then
	letters.TextColor3 = Color3.new(0,255,0)
	letters.Text = "Clear Skies"
end