Weather Calc for iPhone

From Black Cat Systems:

Weather Calc performs the following weather relation calculations:

Altimeter Setting - compute the altimeter setting based on elevation and station pressure
Heat Index - compute the heat index based on the temperature and relative humidity
Pressure - convert between hPa, atmospheres, psi, and inches and mm of mercury (Hg)
Relative Humidity - compute the wet bulb and dewpoint based on the temperature, pressure, and relative humidity
Standard Atmosphere - compute the temperature, pressure, density, viscosity, speed of sound, and more
Station Pressure - compute the station pressure based on the elevation and altimeter setting.
Temperature - convert between degrees Fahrenheit, Celsius, Kelvin, and Rankine
Virtual Temperature - compute the virtual temperature based on the temperature, dewpoint, and pressure
Vapor Pressure - com[ute the saturated and actual vapor pressure, as well as relative humidity
Wet Bulb - compute the dewpoint and relative humidity based on the temperature, pressure, and wet bulb reading
Wind Chill - compute the wind chill based on the temperature and wind speed
Wind Speed - convert between knots, kilometers/hour, meters/second, miles/hour, feet/second