Department of Transportation (ME)
From The RadioReference Wiki
Radio Codes
Weather
w1=clear
w2=partly cloudy
w3=cloudy
w4=raining
w5=freezing rain
w6=sleeting
w7=light snow
w8=heavy snow
Road Conditions
r1=pavement bare & dry
r2=Pavement bare & wet
r3=snow on pavement
r4=ice on pavement
r5=slush on pavement
T= Temperature in Degrees
D= Depth in Inches