Laserfiche WebLink
<br />Two cloud models are avai lable for EON processing: GPCM and <br />MESOCU, GPCM is a simple, fast. one-dimensional, steady-state, <br />convective cloud model developed by Hirsch [7]. It analyzes the <br />poten,tial for convective development within the constraints of a 1-0 <br />steady-state cloud model [8] using a specific sounding as input. <br />The model computes a convective condensation level, checks to see if <br />the surface convect ive temperature for the input sounding may be <br />reached; if so, it simulates Lagrangian parcel dynamics of the cloud. <br />This model has been modified to provide an analysis of sounding <br />stabi I i ty, moisture, and wind shear for selected levels above the <br />ground as shuwn in table 3, The model also provides a summary of <br />internal microphysical structure of clouds for the six radi i <br />simulated. The model may be considered as an objective analysis tool <br />which quantifies processes such as parcel buoyancy. water loading. <br />entrainment, and wind shear. which affect convective cloud growth, <br />The virtual temperature of cloud and environment are plotted in <br />figure 4 for the 10.-km updraft radius case shown in table 3. <br /> <br />10 <br /> <br /> <br />-90 <br /> <br />-70 <br /> <br />-50 -40 <br /> <br />STAT 10N/OATE MA 79071715 <br />/ UPORArT RAOIUS IKMJ 10,0 <br /> <br /> 20 <br /> .., <br />a: - <br />a.. 30 ENV I RONMENTAL TEMP . SOLI D LI N!: <br />:>0:: <br /> CLOUD TEMPERATURE . DOTTED LI N!: <br />W ~ DEWPO I NT - DASHED LI NE <br />0::: <br />::J / <br />en 40 <br />en <br />w ~ LEGl:ND <br />0::: o . NATURAL <br />a.. . . MODifiED <br /> 50 ~ <br /> \ <br /> 60 \ <br /> 70 40 '~ <br /> 80 \ <br /> 85 , <br /> ..-. <br /> ~ <br /> 100 <br /> TEMPERATURE (el <br /> <br /> <br /> <br /> <br />Figure 4. Example of the Great Plains Cloud Model thermodynamic <br />a n a I y s i s 0 f c Iou d grow t h pot e n t i a I for the Mid I and. T e x ass 0 u n din g <br />at 1500 G, m. t, on July 17. 1979,., Cloud and environment virtural <br />temperatures are plotted on a skew T-Iog P diagram showing the relative <br />positive area of the cloud with very little entrainment (11-km updraft <br />radius), Note that the observed radar echo top heights were 11- to <br />13-km m.s.I,. in close agreement with the model, <br /> <br />8 <br />