Add values from NWS online calculator for reference.
Add values from NWS online calculator for reference.

ShawnMurd/MetPy,Unidata/MetPy,ahaberlie/MetPy,ahaberlie/MetPy,jrleeman/MetPy,dopplershift/MetPy,Unidata/MetPy,dopplershift/MetPy,jrleeman/MetPy