The forecasting technique that says that upstream weather will persist before then move on to affect new areas in its path is the trend technique or trend method.
Trend technique is a technique in forecasting that is used when the related phenomenon is in a steady state or is moving at a constant speed. It's more accurate on a shorter time scale (minutes to hours), so it's also known as the "nowcasting" technique. This method involves finding out the speed and direction of movement for things like fronts, pressure centers, and areas of precipitation and clouds.
Besides the trend technique, there are other techniques that can be used to produce a forecast. Some examples are the persistence method, climatology method, analog method, and numerical weather prediction.
Learn more about weather forecast at https://brainly.com/question/13896351
#SPJ4
