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UK weather: Heatwave brings hottest September day in over a century UK weather: Heatwave brings hottest September day in over a century
(about 17 hours later)
Today is the hottest September day in over a century – with a temperature of 34.4C recorded in Kent. Tuesday was the hottest September day in over a century – with a temperature of 34.4C recorded in Kent.
The high was reached on Tuesday afternoon, according to the Met office, making it the warmest day of the year so far.The high was reached on Tuesday afternoon, according to the Met office, making it the warmest day of the year so far.
It meant parts of the UK were hotter than forecasts for Mexico City, Los Angeles and Madrid.
In London, temperatures on some Tube trains were reported to have hit 35C - five degrees warmer than the limit after which it is illegal to transport cattle under EU regulations. 
The last time it was so hot in September was in 1911.The last time it was so hot in September was in 1911.
A north-south divide was widely expected, with thunderstorms hitting the North while the South basks in hot summery sunshine.A north-south divide was widely expected, with thunderstorms hitting the North while the South basks in hot summery sunshine.
Health warnings were issued in southern parts, but yellow warnings of rain are now in place for northern England and south-east Scotland.Health warnings were issued in southern parts, but yellow warnings of rain are now in place for northern England and south-east Scotland.
The Met Office said: "A very warm and humid air mass is in place across much of the UK, with conditions marginal for thunderstorm development this afternoon as temperatures rise.The Met Office said: "A very warm and humid air mass is in place across much of the UK, with conditions marginal for thunderstorm development this afternoon as temperatures rise.
"Northern England and southeast Scotland are currently judged the most likely area to see scattered thundery downpours, but even here many places will have no more than light rain."Northern England and southeast Scotland are currently judged the most likely area to see scattered thundery downpours, but even here many places will have no more than light rain.
"However, where storms do form, there is a lot of moisture and energy available, with the risk of more than 30mm of rain in around an hour, large hail and frequent lightning.""However, where storms do form, there is a lot of moisture and energy available, with the risk of more than 30mm of rain in around an hour, large hail and frequent lightning."
The yellow warnings are valid from 2pm to 11pm.The yellow warnings are valid from 2pm to 11pm.
Joe Mulligan, head of first aid education at the British Red Cross, said: "Most heat disorders occur because someone has been over-exposed to heat or has over-exercised for his or her age and physical condition.Joe Mulligan, head of first aid education at the British Red Cross, said: "Most heat disorders occur because someone has been over-exposed to heat or has over-exercised for his or her age and physical condition.
"Simple steps such as avoiding exposure to the hottest time of the day, drinking plenty of fluids and even simply wearing a hat on hot days can all make a real difference.""Simple steps such as avoiding exposure to the hottest time of the day, drinking plenty of fluids and even simply wearing a hat on hot days can all make a real difference."