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CHAPTER TWO
METEOROLOGY FLIGHT PLANNING
Valid Time
The computer constructs the Winds-Aloft Prognostic Charts based on observed winds and
temperatures recorded at a particular valid time. Figure 2-20 shows four panels with enlarged
legends for easier viewing. These charts represent forecast winds and temperatures for a specific
time, rather than a period of time. Since wind speeds generally change slowly in the upper
atmosphere, these winds and temperatures are considered to be representative forecast averages
until the next set of charts is received. Therefore, the information shown is theoretically accurate
for the valid time of the chart only.
Figure 2-21 Legend of Winds-Aloft Prognostic Charts
209.
WINDS-ALOFT FORECASTS
Winds-Aloft Forecasts are teletype forecasts of upper winds and temperatures for selected
stations within the continental United States (Figure 2-21). They are transmitted twice a day and
the teletype identifier "FD" appears in the heading. Additionally, they are broken into two
segments. Each segment gives a valid time and a for-use time (the forecast period) at the
beginning of each segment; the total forecast is usable for a period of 15 hours. The forecast
represents conditions both as they should occur specifically at the valid time and also the average
conditions as they should occur during the for-use time.
2-22 DATA DISPLAYED ON WEATHER IMAGERY PRODUCTS


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