RT @NWS: Did you know that before TV and internet they used to use this flag to tell people when a cold front like today’s was coming? Learn more about weather signal flags in this NOAA Heritage story: https://t.co/5gAjaUJifO https://t.co/LUQRXT9qMj NOAA Satellites Climate Change Science on Telegram by @ClimateChangeScience A @grttme project - Other backups: @Hallotme