Excel Macro Snow Algo

Option Explicit

Private Sub snowtest()
    ' column A = Date
    ' column C = Raw Data
    ' column D =
    Dim columnDate As Integer
    Dim columnSDC As Integer
    Dim columnINFIL As Integer
    Dim columnADD As Integer
    Dim columnDEL As Integer
    Dim currow As Long
    Dim futureoffset As Long
    Dim curinfilval As Double
    Dim nextinfilval As Double
    Dim curSDCval As Double
    Dim futureSDCval As Double
    columnDate = 1
    columnDEL = 4
    columnADD = 5
    columnSDC = 6
    columnINFIL = 8
    currow = 5436
    futureoffset = 18 * 12 ' (12 measurements per hour, offset is +18 hours)
    Do While Worksheets(1).Cells(currow, columnADD).Value <> "end of season"
        curinfilval = Worksheets(1).Cells(currow, columnINFIL).Value
        nextinfilval = Worksheets(1).Cells(currow + 1, columnINFIL).Value
        curSDCval = Worksheets(1).Cells(currow, columnSDC).Value
        futureSDCval = Worksheets(1).Cells(currow + futureoffset, columnSDC).Value
        
    Loop
End Sub