wmforecast: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/wmforecast - from package: wmforecast

You may install the required package with command apt-get install {package}

Error in other languages:
wmforecast: bevel nie gevind nie
wmforecast: comandă negăsită
wmforecast: comando não encontrado
wmforecast: commande introuvable
wmforecast: command not found
wmforecast: käsku ei ole
wmforecast: không tìm thấy lệnh
wmforecast: komanda nerasta
wmforecast: Kommando nicht gefunden.
wmforecast: kommandot finns inte
wmforecast: komut yok
wmforecast: nie znaleziono polecenia
wmforecast: níor aimsíodh an t-ordú
wmforecast: no se encontró la orden
wmforecast: no s'ha trobat l'ordre
wmforecast: opdracht niet gevonden
wmforecast: parancs nem található
wmforecast: perintah tidak ditemukan
wmforecast: príkaz nenájdený
wmforecast: příkaz nenalezen
wmforecast: команда не найдена
wmforecast: командата не е открита
wmforecast: 命令找不到
wmforecast: コマンドが見つかりません