National Weather Service United States Department of Commerce

A Number Of Hazards Expected Today

A number of hazards are expected across the U.S. today. Severe thunderstorms are expected in the Upper Mississippi Valley and from Missouri to the Carolinas. Widespread critical fire weather conditions are likely from the Southwest to south-central High Plains. Flood watches are in effect for parts of Hawaii and Alaska. Finally, record heat persists in the Southern U.S. Read More >

 Pressure Altitude

by Tim Brice and Todd Hall
Enter your uncorrected station pressure (not the altimeter setting): Pressure Altitude in feet:
  in of mercury mm of mercury millibars (hPA) ft
  Pressure Altitude in meters:


What is the formula for the pressure altitude script?