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<br />SEPTEMBER 1988 <br /> 300 <br /> 9 <br /> 8 <br /> 400 <br /> 7 <br /> 6 <br />_500 <br />.a E <br />oS ~5 <br />w <br />0: t- <br />~600 :>: <br />'" <br />rtl w4 <br />w <br />0: :>: <br />Q. <br /> 700 3 <br /> 800 2 <br /> 900 <br /> 1000 <br /> <br />MARK F. HEGGLI AND ROBERT M. RAUBER <br /> <br />1001 <br /> <br /> <br />-45 <br /> <br />-40 <br /> <br />-35 <br /> <br />-30 <br />-25 <br /> <br />~ IlL HL- <br />~ ~ Z IIL~ ~ <br /> <br />~ ~~ ~~: <br /> <br />".~'_n.. ~ _.._ <br />- -~-__ ---:ll.--_: . .' ~ I, ' <br /> <br />-20 <br /> <br />~... _._" ..1- _~.. .!:.- '-' -.-!,-:.- mn._. ~ <br />~~-_.__...t_.n '. ~-i .-.-'~Ji--:~- <br /> <br /> <br /> 320 <br />300 ~ 318 <br /> 9 <br /> 312 <br /> 8 <br />400 308 <br /> 7 <br /> <br /> 6 <br />_500 <br />.a E <br />oS ~5 <br />w <br />0: t- <br />~600 :>: <br />'" ..... <br />rtl w4 <br />w <br />0: :>: <br />Q. <br /> 700 3 <br /> 800 2 <br /> 900 <br />1000 <br /> <br />310 <br /> <br />j('~ 302 <br />. .''-:. '---- <br />~~: .~~, 298 <br /> <br />~ - .....298 <br /> <br />09 06 03 00 21 18 15 12 09 <br />(2125) TIM E (UTe) (2124) <br /> <br />FIG. 8. As in Fig. 5, but for 0900 UTC 24 February 1984 to 0900 UTC 25 February 1984. <br /> <br />typically in the postfrontal period immediately follow- <br />ing the passage of the cold frontal rainband in quantities <br />from 0.05 to 0.60 mm. The duration of measurements <br />of this magnitude ranged from I I to 32 hours. The <br />data trace typically contained many peaks associated <br />with convective cells passing over the radiometer. These <br />cells were either nonprecipitating or produced light <br />showers. Supercooled water was sometimes observed <br />in the prefrontal period" which lasted from 6 to 13 <br />hours. The magnitude of prefrontal supercooled water <br />was generally 0.05-0.20 mm. The increase in super- <br /> <br />cooled water in the postfrontal period appeared to be <br />associated with several factors. The depth of the cloud <br />generally reduced in response to upper troposphere <br />subsidence induced on the cyclonic side of the upper- <br />level jet. This lowering of cloud top reduced the flux <br />of ice particles from higher cloud levels and was gen- <br />erally marked by a substantial reduction in precipita- <br />tion. A second factor was the presence of convection. <br />In developing turrets, higher vertical velocities were <br />likely to enhance local liquid water production. Finally, <br />the winds behind the front shifted toward a more bar- <br />