I too agree with Wings. The TEMPO, BECMG and NOSIG explains the tendency at the time of the METAR.
The METAR reports the weather at the specific time, and if any significant change are to be expected the next hour, this will be presented as TEMPO or BECMG.
The TAF are issued only once every 3 hours, and I think we can all agree on weather often changing much quicker than this.