Data Sources

European Centre for Medium-Range Weather Forecasts

NCEP Global Forecasts for Stratosphere

National Center for Environmental Prediction Stratospheric Forecasts

National Center for Environmental Prediction Annual Data

Polar Vortex Forecasts in Northern Hemisphere at the Center for Global Environmental Research (CGER)

Vertical Cross Section of Geopotential Height Anomalies at the National Weather Service Climate Prediction Center

National Oceanic and Atmospheric Administration

American Meteorological Society

Weather at lidar sites in Alaska, Greenland, Nunavut and Norway

Meteorological Service of Canada (PEARL, Eureka, Nunavut)

Danish Meteorological Institute (SUARF, Kangarlussaq, Greenland)

Norwegian Meteorological Institute (ALOMAR, Andoya, Norway)

US National Weather Service Alaska (PFRR, Chatanika, Alaska)