Added a variable description

hurricane/variable_list.csv

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+,parameter,full_name,level,units
+0,U10m,Zonal Wind at 10m,Surface,m/s
+1,V10m,Meridional Wind at 10m,Surface,m/s
+2,T2m,Temperature at 2m,2 meters,K
+3,SLP,Sea Level Pressure,Sea Level,hPa
+4,QV2m,Specific Humidity at 2m,2 meters,kg/kg
+5,TQI,Total Precipitable Ice Water,Integrated,kg/m2
+6,TQL,Total Precipitable Liquid Water,Integrated,kg/m2
+7,TQV,Total Precipitable Water Vapor,Integrated,kg/m2
+8,U63,Zonal Wind at eta level 63,850 hPa,m/s
+9,U56,Zonal Wind at eta level 56,700 hPa,m/s
+10,U50,Zonal Wind at eta level 50,487 hPa,m/s
+11,U44,Zonal Wind at eta level 44,244 hPa,m/s
+12,U39,Zonal Wind at eta level 39,108 hPa,m/s
+13,V63,Meridional Wind at eta level 63,850 hPa,m/s
+14,V56,Meridional Wind at eta level 56,700 hPa,m/s
+15,V50,Meridional Wind at eta level 50,487 hPa,m/s
+16,V44,Meridional Wind at eta level 44,244 hPa,m/s
+17,V39,Meridional Wind at eta level 39,108 hPa,m/s
+18,T63,Temperature at eta level 63,850 hPa,K
+19,T56,Temperature at eta level 56,700 hPa,K
+20,T50,Temperature at eta level 50,487 hPa,K
+21,T44,Temperature at eta level 44,244 hPa,K
+22,T39,Temperature at eta level 39,108 hPa,K
+23,QV63,Specific Humidity at eta level 63,850 hPa,kg/kg
+24,QV56,Specific Humidity at eta level 56,700 hPa,kg/kg
+25,QV50,Specific Humidity at eta level 50,487 hPa,kg/kg
+26,QV44,Specific Humidity at eta level 44,244 hPa,kg/kg
+27,QV39,Specific Humidity at eta level 39,108 hPa,kg/kg
+28,OMEGA63,Vertical Velocity at eta level 63,850 hPa,Pa/s
+29,OMEGA56,Vertical Velocity at eta level 56,700 hPa,Pa/s
+30,OMEGA50,Vertical Velocity at eta level 50,487 hPa,Pa/s
+31,OMEGA44,Vertical Velocity at eta level 44,244 hPa,Pa/s
+32,OMEGA39,Vertical Velocity at eta level 39,108 hPa,Pa/s
+33,H63,Geopotential Height at eta level 63,850 hPa,m
+34,H56,Geopotential Height at eta level 56,700 hPa,m
+35,H50,Geopotential Height at eta level 50,487 hPa,m
+36,H44,Geopotential Height at eta level 44,244 hPa,m
+37,H39,Geopotential Height at eta level 39,108 hPa,m