Can I make this PowerShell Script accept commas?

Question

The following powershell script outputs the results twice when there is a comma. It separates the strings as two entries. How can I make it treat it as one string instead of two?

Function Get-Weather {
    [Alias('Wttr')]
    [Cmdletbinding()]
    Param(
            [Parameter(
                Mandatory = $true,
                HelpMessage = 'Enter name of the City to get weather report',
                ValueFromPipeline = $true,
                Position = 0
            )]
            [ValidateNotNullOrEmpty()]
            [string[]] $City,
            [switch] $Tomorrow,
            [switch] $DayAfterTomorrow
    )

    Process
    {
        Foreach($Item in $City){
            try {

                # Check Operating System Version
                If((Get-WmiObject win32_operatingsystem).caption -like "*Windows 10*") {
                    $Weather = $(Invoke-WebRequest "http://wttr.in/$City" -UserAgent curl -UseBasicParsing).content -split "`n"
                }
                else {
                    $Weather = (Invoke-WebRequest "http://wttr.in/$City" -UseBasicParsing).ParsedHtml.body.outerText  -split "`n"
                }

                If($Weather)
                {
                    $Weather[0..16]
                    If($Tomorrow){ $Weather[17..26] }
                    If($DayAfterTomorrow){ $Weather[27..36] }
                }
            }
            catch {
                $_.exception.Message
            }
        }            
    }

}

Get-Weather Shrewsbury,MA?n1

Answer 1

Also remember that when you use single quotes "single-quotation marks (a single-quoted string), the string is passed to the command exactly as you type it. No substitution is performed." Versus when you use double quotes "double quotation marks (a double-quoted string), variable names that are preceded by a dollar sign ($) are replaced with the variable's value before the string is passed to the command for processing."

This is from: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_quoting_rules?view=powershell-6 and is for PowerShell 6, but the same rules apply to PowerShell 1 through 6.

So unless you need to use a variable inside the string, the single quotes will force PowerShell to use the string exactly how you have it written.