RAINFALL may be for a period greater than 24 hours. The period, in days, will then be placed in the column headed "days". SEAS: C Calm SM Smooth SL Slight M Moderate R Rough VR Very Rough H High VH ...

The shade WBGT is calculated for an environment shaded from direct (and strong reflected) solar radiation and where surfaces are not significantly hotter or colder than the indicated air temperature. ...