BloomSky image uploader for Wunderground. Set cron job to upload as often as you'd like.

bsitowu.py

import urllib.request
import json
import ftplib

url = 'http://api.bloomsky.com/api/skydata/'
api = '<insert your api from dashboard.bloomsky.com>'

req = urllib.request.Request(url,headers={'Authorization':api})
response = urllib.request.urlopen(req)

jsondata = json.loads(response.read().decode('utf-8'))
j = (jsondata[0]['Data'])
imageurl = j['ImageURL']

urllib.request.urlretrieve(imageurl, '/home/pi/image.jpg')

server = 'webcam.wunderground.com'
username = '<your cam ID from Wunderground>'
password = '<your wunderground password>'
ftp_connection = ftplib.FTP(server,username,password)

remote_path = '/'

ftp_connection.cwd(remote_path)
fh = open("/home/pi/image.jpg",'rb')
ftp_connection.storbinary('STOR image.jpg', fh)
fh.close()