How you do weathermen (or women) know what the weather is going to be like 10 days from now?

Question

Like on the 10 day forcast, it might say rain a week from now and when that day comes, its a 99% chance that it rains on that day. How do they pinpoint the weather like that?

Answer 1

We make predictions based on computer models of atmospheric conditions. For example, if we take measurements for the LAST 10 days, then using that data, we can predict what the weather might be light for the next 10 days. It's not an exact science, but the models are generally correct. All weather patterns are determind by the jet stream and the movement of the jet stream over the continent. Where the jet stream will be determined whether you will have arctic air or warm, humid air over where you live.

FYI- weather balloons have nothing to do with prediction like everyone is saying in here. They just give us a real time and accurate "slice" of measurements through the atmosphere... we use this data to generate a "skew T" diagram. These are pretty neat, if you go to a search engine and type in "skew T denver" for example, (replace denver with your city) you can see the most recent skew T diagram for your city (it's usually on the www.unisys.com website)

Answer 2

Years ago they did NOT know ten days in the future, or even sometimes 24 hours in advance-! It was pretty bad then, and you could not fully rely on any weather forecast. The Great Blizzard of 1978 in New England came as a "surprise" to a number of the weathermen of the time! Now there are satellite images from everywhere on Earth, there are Doppler radar images from everywhere, and -- very importantly -- they have used huge amounts of past weather data to construct computerized models of what the weather will be! The construct a model, have it "predict" what will happen, they look at what actually DID happen, and then they modify the model to be more accurate! The more time that passes - the more data they can use to refine and to modify these computer models! Years ago there were only visual and measurement observations, no radar, no Doppler radar, no satellite images, and certainly no computerized weather forecasting models-!

Answer 3

Weather balloons and predictions based on satellite data and past weather patterns. If the jetstream is going to be in a certain spot next Wednesday, and if it has historically rained during those exact conditions, they'll make their prediction.

Answer 4

We don't know really. We only predict according to the data giving to us by future atmospheric tracking devices and/or computers and historical events that occured in that area that same date.

Answer 5

They don't; most of those dunces don't know what will happen tomorrow, much less, 10 days out.
They have all these multi million dollar computers and other equipment and still throw a dart to see what will happen next.

Answer 6

they use radar's satellite's weather balloons and computer modules to predict the weather and i think the jet stream too not to sure about that though. :)

Answer 7

um.... no... about as a lot as i do... we were sitting at a t-ball recreation lastnight and they suggested it grow to be going to rain... properly no sh it!!!!!! it grow to be black out.. the wind grow to be blowing like loopy, it grow to be thundering, and correctly you need to experience the damp in the air.. so wager what? it rained...

Answer 8

weatherman detect the wheather by using a baloon called a weather baloon.Everyday at specific time the baloon is released that way they detect the weather.

Answer 9

They don't, they are only guessing at what it could be like

Answer 10

they dont