public static function current($latitude, $longtitude, $format = 'json')
 {
     $weather = Weather::free($latitude, $longtitude, '2', $format);
     if ($weather == FALSE) {
         return false;
     } else {
         $weather = json_decode($weather);
         $current_conditions = $weather->data->current_condition[0];
         return $current_conditions;
     }
 }