Hi, teachers:

I'm very confused about the combination of adverbs and adjectives. When should an adjective be preceded by an adverb and when an adjective? It looks to me there's no rule to follow?? ( being a non-native speaker)

For example, I'v heard usages like:

She's sizzlingly hot.
The shirt is blinking cheap.
It is blistering cold.
It could get alarmingly rainy in the summer here.
I find the last two ones extremely confusing. I assume they are all correct usages, aren't they? But why "cold" is preceded by adjective "blistering" while "rainy" by adverb "alarmingly"

Any rules to follow?

Many thanks in advance.