Based on the data you have seen so far, why do you think the analysis differed
so markedly from the FWD raob in the 750-550 hPa layer? Choose all choices
that apply, then click Done. (To undo a selection, click the choice again.)
Discussion
The observed sounding looks fine and the first guess looks reasonable in this layer, so something else must be
pulling the analysis in a different direction. Indeed, it is more data! Temperatures were reported by four aircraft
arriving at DFW along nearly overlapping flight tracks approaching from the northeast. Each dot represents the
location of the airplane when it reported a temperature, with a different color dot for each aircraft. Two other
aircraft reported one temperature each within around 50 hPa of 700 hPa. The three radiosonde dots represent the location
of the drifting balloon as it ascended through three levels. Notice that most of the aircraft observations were taken
around 670 hPa, with descent toward lower levels at the south end of the flight pattern.