During the positive (warm) phase of the ____________________, ...

[mpobi80]

During the positive (warm) phase of the ___________________ _, higher pressures to the south and lower pressures across the Arctic produce strong westerly winds aloft. These winds wrap around the semipermanent zone of upper-level low pressure over the North Pole that is sometimes referred to as the ___________________ _.
   
  Fill in the blank with correct word.

Question 2

Over the Atlantic, a periodic reversal of pressure called the ___________________ _ has a substantial effect on the weather in Europe and along the east coast of North America, especially during the winter.
   
  Fill in the blank with correct word.

[quynhmickitran]

Answer to Question 1

ANSWER: Arctic Oscillation; polar vortex
AO; polar vortex
Arctic Oscillation (AO); polar vortex

Answer to Question 2

ANSWER: North Atlantic Oscillation
North Atlantic Oscillation (NAO)
NAO

[mpobi80]

Gracias!

[nguyenhoanhat]

Thanks for the timely response, appreciate it