Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Northern Hemisphere 500 hPa height anomaly chart for large fire years in Yukon Territory. H, high geopotential height anomalies; L, low geopotential height anomalies. Note the prominent mid-tropospheric blocking highs over the area of Yukon Territory (northwest Canada) .
