At 0450Z the
wind is from the SW, the station has low cloud and heavy rain; typical of an
approaching warm front.
By 0650Z the
wind has veered, the rain has stopped, the temperature and dew point have both
increased; all of these factors indicate that a warm front has passed through
the station.
As we go
through the day the temperature builds to a maximum of 24ºC at 1450Z, the cloud
dissipates and the visibility improves but the wind direction is fairly
consistent.
This indicates
a normal diurnal variation in the same air mass; i.e. the passage of the warm
sector.
After 1450Z we
see the thunderstorms and heavy rain associated with a cold front.
By 1850Z the
wind has veered and the temperature and dew point dropped indicating the
completed passage of the cold front.