Do you think there will be a storm later? It's very hot today.
The word "will" functions as a modal verb in English, indicating future tense. In the sentence "Do you think there will be a storm later? It's very hot today," "will" is used to form the future tense of the verb "be."
It completes the sentence structure by expressing the speaker's uncertainty or speculation about a future event (a storm) based on the current weather condition (hot today).
The modal verb "will" is crucial for constructing sentences that discuss or inquire about future actions or events in English.