UK's hottest day of the year so far

 On  Friday  31st,  the  UK   experienced  its hottest day of the year so far   this  year.  The  temperature  of  9°C  was reached   in  St James's Park in central London. 
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   The  highest temperature recorded   so  far  this year was   30°C.  5C at Wisley in Surrey on   June  26th.
 
   Temperatures across the UK are  expected to reach   between  25   and  31   degrees  Celsius on Friday as the   heatwave  reaches  its  peak.
 
   Colder  weather   spreads  east  over the weekend   and  more typical  July   temperatures  are  expected   on  Sunday.
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   The  heat  rises
   After a   fairly  chilly  start to July   which  saw  temperatures  around   2°C  below average, many of us have welcomed some   summer  heat.
 
   Many places   have  failed  to  reach  25°C  since the   brief  burst of warm weather   in  late  June. 
 
   Heat   warnings  are in   place  in  the   Midlands  and   the  east  and  south  of  England until 11am on Saturday.
 
   These   warnings  are   mainly  aimed  at  health and social care services,   and  warn  that   the  heat could   affect  the elderly and those with underlying health conditions.
 
   Map  of  UK heatwave   limits  above  28°C  inland
   Image   caption:
   Temperatures   need  to  reach a certain level   for  three consecutive days to meet the Met Office definition of a   heatwave.
 
   Is this a   heatwave?  ?
   For this to be declared a   heatwave,  the Midlands, much of southern England and East Anglia would need to have three   consecutive  days above   27°C.
 
   That temperature   threshold  rises to   28°C  in  London and some of   its  boroughs.
 
   With temperatures starting to   drop  over  the weekend,   we're  unlikely  to   see  this brief   heatwave  officially   become  a heatwave in most areas.

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