Laura Tobin Instagram – ❄️ What makes it officially a #WhiteChristmas? ❄️ It used to be that one flake of snow had to fall at London weather centre in tue 24 hours of Christmas Day, then it closed-so no one is there to monitor. ❄️ Now at the @metoffice HQ in Exeter the forecasters on shift will look at weather observations and satellite images and radar to deduce if it snowed on Christmas Day (tough job @craigtsnell) @gmb