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METEOROLOGY FLIGHT PLANNING
CHAPTER FOUR
Notice, though, that Part III does not list the whole TAF for the particular aerodrome. It will only
list the one line (or more, including applicable change groups) that applies to the required valid
time, based on the ETA stated on the DD 175 flight plan. As described in Chapter One, the
military requires that destination (and alternate) weather be forecast for the flight to include the
period of +1 hour of the planned ETA.
Another feature of Part III is that the cloud layers are listed immediately after the airfield
identifier, because ceilings are the primary weather factor used to determine whether an alternate
is required. The next column lists the visibility at the field, as this is the other factor in the
requirement for an alternate. Using Figure 4-6, which airfield, SPS or TUL, would be the best
choice for an alternate (assuming all airfields have minimums of 200-1/2)? Review Chapter One
if necessary, because when the weather is problematic, it will be at this point in the preflight
process that the determination of the alternate is made. An aviator can wait until after the
DD 175-1 is briefed to select an alternate, but it must be indicated by the time the DD 175 flight
plan is submitted to Base Operations. The instructor will conduct a discussion of this decision
during class.
To build a weather overview before the weather brief, an aviator would be duplicating the efforts
of the meteorologist to leaf through the many lists of TAFs available. However, an overview of
destination weather can be quickly gathered from the facsimile sources. Aviators can check the
Surface Analysis Chart for observed pressure systems and fronts, and the Surface Prognostic
Chart for a forecast of the same information. Additionally, since TAFs are transmitted less often
than METARs, the reliability of a forecast can be determined during the weather briefing by
comparing existing weather conditions with forecast weather conditions at the destination (or by
comparing the METAR to the TAF).
For your convenience, a summary of the sources that may be used to forecast the weather for
Parts II and III are shown in Figure 4-7.
FLIGHT WEATHER BRIEFING FORM, DD FORM 175-1 4-11


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