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<br />Millibar <br />Pressu re <br /> <br />OMAHA, NEB. <br />03 APR. 1972 <br /> <br />500 <br /> <br /> <br />Figure 2: Upper ail' sounding~ in <br />whiah the dew point terrrpera- <br />ture drops off slOUJly with <br />height. The surfaae observa- <br />tions at the time of reZease of <br />the rcauinsonde are also given. <br /> <br />600 <br /> <br />74D 10 $ 4 SW- <br />700 WND 360o/24G31 <br />Surface observation IISOGMT <br />Rain ended at 1120GMT <br />Pressure rising rapidly <br /> <br />800 <br /> <br />900 <br /> <br />,1000 <br />-30 <br /> <br />-20 <br /> <br />-10 <br /> <br />o <br /> <br />10 <br /> <br />Temperature (Oel <br /> <br />shallow systems climatology" since deep storm systems often <br />extend to higher levels than indicated by the 85 percent <br />limit. Shallow storm systems generally form below a <br />temperature inversion or are trapped below a layer of dry <br />air. Thus, the top of the moist layer is required to have <br />either a rapid decrease in relative humidity, or an increase <br />in the lapse rate to'isothermal or more stable than iso- <br />thermal. The model requires that the inversion, or dry air <br />layer, be within 50 mb of the top of the moist layer. <br /> <br />6 <br />