UnScramble this Word: p o a d u l?

Questions

Which hot, dusty wind blows into Egypt, from the south in early spring and summer?

Which three-letter word can precede each of the following to make a new word each time?

Which warm wind from the south which is drawn into the valleys of the Northern Alps, helps to melt the snow in the spring?

What would be your astrological sign if your birthday was 1st April?

What would be your astrological sign if your birthday was 1st September?