ajax request ember passing through component

i just wanna get value from json request in ember services from component. this is my code

forecast-weather.js (services)

import Ember from 'ember';  
    export default Ember.Service.extend({
      findWeatherCurrent:function (lat,lng) {
        return Ember.$.getJSON('http://ift.tt/2mI80IJ'+ lat +','+lng+'?exclude=minutely,hourly,daily,flags&units=si');
      },
      findWeatherDaily:function (lat,lng) {
        return Ember.$.getJSON('http://ift.tt/2mI80IJ'+ lat +','+lng+'?exclude=minutely,hourly,currently,flags&units=si');
      },
      findWeatherHourly:function (lat,lng) {
        return Ember.$.getJSON('http://ift.tt/2mI80IJ'+ lat +','+lng+'?exclude=minutely,daily,currently,flags&units=si');
      }
    });

weather-display.js (component)

import Ember from 'ember';

export default Ember.Component.extend({
  forecastWeather:Ember.inject.service(),
  willRender(){
    let lat = this.get('lat');
    let lng = this.get('lng');
    this.get('forecastWeather').findWeatherCurrent(lat,lng).then(data => {
      this.set('currents', data);
      console.log(data);
    });
  }
});

jsonRespon

{

    "latitude": 37.8267,
    "longitude": -122.4233,
    "timezone": "America/Los_Angeles",
    "offset": -7,
    "currently": {
        "time": 1489488513,
        "summary": "Clear",
        "icon": "clear-night",
        "nearestStormDistance": 47,
        "nearestStormBearing": 87,
        "precipIntensity": 0,
        "precipProbability": 0,
        "temperature": 13.54,
        "apparentTemperature": 13.54,
        "dewPoint": 8.59,
        "humidity": 0.72,
        "windSpeed": 0.87,
        "windBearing": 46,
        "visibility": 12.46,
        "cloudCover": 0.08,
        "pressure": 1016.58,
        "ozone": 279.62
    }

}

weather-display.hbs

<p id="word_on_change" class="font_black font-white word"></p>

i just wanna passing that windspeed value from json to hbs template, but it doesnt working. can anyone solve this :(