Observed average surface pressure and winds during January

Semi-permanent pressure areas:

  1. Bermuda-Azores High

  2. Pacific High

  3. Aleutian Low

    • genesis region for cyclones impacting the Pacific NW

  4. Icelandic Low

Seasonal pressure areas:

  1. Siberian High

  2. Canadian High

Check out the 500 mb hemispheric chart to identify any of these semi-permanent or seasonal highs and lows....