this is the Technology Report.Many Americans start to closely follow weather reportsin the early fall.During the Atlantic hurricane season,predicting the strength and movement ofthese huge storm systems is of crucial importance.Thanks to new supercomputers,meteorologists for the National Oceanicand Atmospheric Administration (NOAA)are getting better at predicting the weatheras far as six days out.Hurricane Sandy hit the East Coast last October,and caused deaths and widespread damage,it was one of the costliest storms in U.S. history.At the time, some people blamed meteorologistsfor not correctly predicting the path of the storm.But weather forecasting is extremely difficult, says Ben Kyger.He is the Director of Central Operationsat NOAA's National Centers for Environmental Predictionin College Park, Maryland."You’ve got major patterns in the atmosphere,like the jet stream,but you’ve also got little eddies, little currents,little things happening all over the place.All these little changes are interacting with each other,continuously, all day long.So if you look at it from above, from a satellite,you see the atmosphere movingand churning in big ways and little ways."Ben Kyger says oceans are another issuebecause they closely interact with the atmosphereand have a huge effect on storms.NOAA has spent about $20 million on two new supercomputers,in an effort to improve the dependability of its forecasts."These computers generate the initial model guidancethat the whole forecast process depends on,for all the weather information that you see,with snowstorms, tornadoes, hurricanes,how hot it’s going to be today— all of your weather forecasts start with what comes off of these supercomputers."It takes a huge amount of computational powerto examine data from weather satellites,ground stations and other sources.It then takes a lot of power to predict temperature,air pressure, humidity and wind speed.But human brains and experienceare still very important to the process.Meteorologists at the National Centersfor Environmental Prediction scan the same datathat the supercomputers get before issuing a weather report."They are looking at lots of different models, that run off different computers,and then they are creating that five-day forecast.They use lots of scientific and subjective knowledgefrom doing it year after year.They know where the models are strong, where they’re weakand they give us significantly better forecaststhan the models would all by themselves."NOAA issues worldwide forecasts every six hours every day of the year.The reports are free and are helpful for many countriesthat cannot afford their own weather service.NOAA continues working to improve its weather-forecasting abilities,another upgrade of its weather-predicting supercomputersis planned for as early as 2015.And that is the Technology Report from VOA Learning English.更多听力请访问51voa.com