Skip Navigation Links 
NOAA logo - Click to go to the NOAA home page National Weather Service   NWS logo - Click to go to the NWS home page
Climate Prediction Center

HOME > Monitoring and Data > Monitoring Weather & Climate > Blocking > Background > North Pacific
Atmospheric Blocking Illustration
Characteristics of Atmospheric Blocking

  • Splitting of westerly flow into two separate branches over a considerable longitudinal extent
  • Easterly flow to the south of the blocking ridge
  • Pronounced meridional flow both upstream and downstream of blocking ridge
  • Presence of deep troughs both upstream and downstream of blocking ridge

NOAA/ National Weather Service
NOAA Center for Weather and Climate Prediction
Climate Prediction Center
5830 University Research Court
College Park, Maryland 20740
Page Author: Climate Prediction Center Internet Team
Page last modified: January 3, 2006
Information Quality
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities