This is the 15465th most frequent Polish word.
sprawdzał
"Sprawdzał" means "was checking" or "checked" in English.
'Sprawdzał' here is in the past tense and indicates an action of checking or verifying that Marek performed at some point in the past.
Marek sprawdzał wyniki egzaminu.
Marek was checking the exam results.
In this sentence, 'sprawdzał' asks if an action of checking (the weather) was done by someone in the past.
Czy ktoś sprawdzał pogodę na jutro?
Did someone check the weather for tomorrow?
Here, 'sprawdzał' reflects the teacher's past activity of reviewing or examining the students' homework.