A record heat wave is expected to affect several western states beginning June 26, with forecast temperatures 20 degrees above normal in many areas. High temperatures are expected to persist for several days, through the Fourth of July weekend.
Density altitudes and thermal turbulence will be significant factors for pilots flying in these areas. Some backcountry airfields in the region should be considered inaccessible for most aircraft types. Pilots at all airfields in these regions will notice a substantial degradation in aircraft performance.
What you should do: