Extratropical cyclones occur mainly in the ____________ when ...

[jayhills49]

Extratropical cyclones occur mainly in the ____________ when temperature and density differences across
  the polar front are most pronounced. Fill in the blank(s) with the appropriate word(s).

Question 2

A(n) ____________ ____________ is a large body of air with nearly uniform temperature, humidity, and
  density throughout. Fill in the blank(s) with the appropriate word(s).

[reversalruiz]

Answer to Question 1

winter

Answer to Question 2

air mass

[jayhills49]

Thanks for the timely response, appreciate it

[cdmart10]

Excellent