The example below details an event that happened in eastern and south-east England. It would have generated an amber warning of snow with the new warning service.
Weather situation on 18 December 2009
Cold north-easterly winds brought very cold air from northern Europe to much of eastern and south-east England a week before Christmas in 2009. The cold air formed bands of snow showers as it crossed the relatively warmer waters of the North Sea.
Snow depths of 5 to 15 cm were reported in quite a few areas most exposed to the snow showers being blown inland from the North Sea, particularly in Kent, East Anglia and Lincolnshire.
Compare these typical accumulations of 5 to 15 cm to the accumulations of 20 - 40 cm and more across north-east England and eastern Scotland in late November and early December 2010. While this event was significant, the snowfalls were not as persistent over a number of days as the 2010 event. Although parts of the highly populated south-east corner of England were affected, impacts were not as severe or long lasting.
A snowplough clearing a road
Based on the new warning system the following assessments would have been made:
This would have resulted in an amber warning for snow: