How are computer-generated weather forecasts prepared??
What will be the ideal response?
ANSWER: The models are programmed into the computer, and surface and upper-air observations of temperature, pressure, moisture, winds, and air density are fed into the equations. To determine how each of these variables will change, each equation is solved for a small increment of future time, say, five minutes, for a large number of locations called grid points, each situated a given distance apart. In addition, each equation is solved for as many as 50 levels in the atmosphere. The results of these computations are then fed back into the original equations. The computer again solves the equations with the new “data,” thus predicting weather over the following five minutes. This procedure is done repeatedly until it reaches some desired time in the future, usually 12, 24, 36, or 48 hours. The computer then analyzes the data and draws the projected positions of pressure systems with their isobars or contour lines.?
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