"Va a nevar esta noche."
Translation:It's going to snow tonight.
How is "It is going to snow this night" not even accepted? (August 7, 2018.)
"Tonight" is always used to mean the current day's nighttime, save for very lyrical or poetic expressions, or to heavily emphasize (this night may be your last!) (This night will be unlike any other). When speaking about the weather, "this night" will never be the translation.