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....