*&^%=USER ALIAS FILE AMDV=DPOS DVRG FLUX PRES LDIF AGEO LAVE GMDV=DPOS DVRG FLUX PRES LDIF GEOS LAVE TMDV=DPOS DVRG FLUX PRES LDIF WIND LAVE THKX=RSLV SDIF HGHT 500 SMLC 7.5 SSBC 1000 PMSL SVLV PVRT=C5-6 SMLT RLTN -1 MGTN -49 VPDF SMLT WVRT LEVL SDVD THTA PRES LDIF LY-1 VPDF=SDIF PRES LVL0 PRES 0000 VENT=WIND VNTO=WIND KEPS=LAST KEPV=LAST THXP=PBOX&THKX CI60&PMSL CIN4 PBX1=BOX1 LSTN 0.25 GRTN 0.01 PBX2=BOX2 LSTN 0.50 GRTN 0.25 PBX3=BOX3 LSTN 1.00 GRTN 0.50 PBX4=BOX4 LSTN 2.00 GRTN 1.00 PBX5=BOX5 GRTN 2.00 PBOX=CLRG PBX5 LAST&CLRF PBX4 LAST&CLRF PBX3 LAST&CLRE PBX2 LAST&CLRE PBX1 TPCI TMPL=SDIF TEMP SMT9 TEMP LSTX=LAST& INRI=SDVD SMLT THTA SMLT SCPY MAGN WIND LDIF SMLT HGHT LDIF THTA LDIF LY-1 RIN1=SDVD[SDVD(THTA LDIF,HGHT LDIF)THTA LAVE]LY-1 RIN2=SMLT SCPY SDVD MAGN WIND LDIF HGHT LDIF LY-1 RIG2=SMLT SCPY SDVD MAGN GEOS LDIF HGHT LDIF LY-1 IGRI=SDVD SMLT THTA SMLT SCPY MAGN GEOS LDIF SMLT HGHT LDIF THTA LDIF LY-1 QVC1=SMLC -1 SSUM SMLT DSDX XCMP GEOS DSDX TEMP SMLT DSDX YCMP GEOS DSDY TEMP QVC2=SMLC -1 SSUM SMLT DSDY XCMP GEOS DSDX TEMP SMLT DSDY YCMP GEOS DSDY TEMP MSFC=SSUM NORM GEOS SMLT FFFF DIST MSKS=SSUM RGTN 0000 MLTN 0000 SDIF PSFC PRES BOXS=BOX9 LT00 MGTN 0000 SDIF PSFC PRES CLRF @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ STABILITY INDICES @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ KINX=SSUM DWPT 850 SSUM SDIF TEMP 850 TEMP 500 SDIF DWPT 700 TEMP 700 TOTI=SSUM SDIF TEMP 850 TEMP 500 SDIF DWPT 850 TEMP 500 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@ WINDS AND DIVERGENCE AVERAGED IN THE VERTICAL @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@ LOW-LEVEL WINDS USING 5 LEVELS WLL5=VDVC 5 VSUM WIND 750 VSUM VSUM WIND 800 WIND 850 VSUM WIND 950 WIND 900 @@@@@@@@@@@@@ LOWER WINDS WW11=VAVR WIND 975 WIND 1000 WW99=VAVR WIND 950 WIND 925 WWLL=VKNT VAVR WW11 WW99 DDLL=SMLC 100 SMLC 1000 DVRG WIND WWLL @@@@@@@@@@@@@ EASTERLY WAVE WINDS WW98=VAVR WIND 900 WIND 850 WW87=VAVR WIND 800 WIND 750 WW77=VAVR WIND 750 WIND 700 WW67=VAVR WIND 700 WIND 650 WWTW=VAVR VAVR WW67 WW77 VAVR WW87 WW98 DDTW=SMTH SMLC 1000 SMLC 1000 DVRG WWTW @@@@@@@@@@@@@ LOW/MID WINDS WW19=VAVR WIND 1000 WIND 925 WW88=VAVR WIND 800 WIND 850 WWML=VAVR WW19 WW88 DV19=SAVR DVRG WIND 1000 DVRG WIND 925 DV88=SAVR DVRG WIND 800 DVRG WIND 850 DDML=SMLC 100 SMLC 1000 SAVR DV19 DV88 @@@@@@@@@@@@@ MID WINDS WW76=VAVR WIND 700 WIND 600 WW54=VAVR WIND 500 WIND 450 WWMM=VAVR WW76 WW54 @@@@@@@@@@@@@ MID/UPPER WINDS WW34=VAVR WIND 300 WIND 400 WW56=VAVR WIND 600 WIND 500 WWMU=VAVR WW56 WW34 DV34=SAVR DVRG WIND 300 DVRG WIND 400 DV56=SAVR DVRG WIND 600 DVRG WIND 500 DDMU=SMLC 100 SMLC 1000 SAVR DV56 DV34 @@@@@@@@@@@ UPPER WINDS WW23=VAVR WIND 200 WIND 250 WW54=VAVR WIND 400 WIND 300 WWUU=VAVR WW43 WW22 @@@@@@@@@@@ UPPER WINDS WW22=VAVR WIND 200 WIND 250 WW43=VAVR WIND 350 WIND 300 DVSU=SMTH SMTH SMLC 1000 SMLC 1000 SAVR DVRG WW22 DVRG WW43 WWSU=VAVR WW43 WW22 REMM=SMTH SAVR RELH 700 RELH 600 @@@@@@@@@ TELL=SAVR TEMP 975 TEMP 950 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ VERTICAL VELOCITY @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ VV54=SAVR VVEL 500 VVEL 400 VV67=SAVR VVEL 700 VVEL 600 VVML=SMLC 1000 SAVR VV54 VV67 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@ GDI (GALVEZ-DAVISON INDEX) @@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@ APRIL 22 2013 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%% LAYER AVERAGES OF TEMPERATURE AND MIXING RATIOS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% POTC=THTA 500 MXRC=MIXR 500 POTB=SAVR THTA 700 THTA 850 MXRB=SAVR MIXR 700 MIXR 850 POTA=THTA 950 MXRA=MIXR 950 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%% EPT (EQUIVALENT POTENTIAL TEMP) FACTORS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% TEMPERATURE LCL IN KELVIN %%% LCLK=SADC 0.15 SADC 273 TLCL LCLK=SADC 0.15 SADC 273 TEMP 850 %%% DENOMINATOR FOR EXPONENTIAL EXDE=SMLC 1006 LCLK %%% EXPONENTIAL FOR LAYERS C, B, A EXPC=EXPP INVS SDVD EXDE SMLC 1000 SMLC 2690 MXRC EXPB=EXPP INVS SDVD EXDE SMLC 1000 SMLC 2690 MXRB EXPA=EXPP INVS SDVD EXDE SMLC 1000 SMLC 2690 MXRA %%% EPT FACTORS EPTC=SADC -10 SMLT POTC EXPC EPTB=SADC -10 SMLT POTB EXPB EPTA=SMLT POTA EXPA %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% TI (THERMAL INDEX) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% MC (MID-TROPOSPHERIC EPT CORE, BASED ON LAYER C EPT) MMCC=SSBC 303 EPTC %%% E (ENHANCEMENT BASED ON LAYER A EPT) EEEE=ZNEG SMLC .065 SSBC 303 EPTA %%% C (CORE FACTOR) CCFF=SMLT MMCC EEEE %%% MT (MID-LEVEL TEMPERATURE THRESHOLD) MTTT=ZNEG SADC 10 TEMP 500 %%% MW (MID-LEVEL WARMING FACTOR) MWWW=SNEG SMLC 7.0 MTTT %%% TI (THERMAL INDEX) TTII=SSUM MWWW CCFF %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% II (INVERSION INDEX) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% IF (INVERSION FACTOR) IIFF=SDIF TEMP 950 TEMP 700 %%% DF (DRYING FACTOR) DDFF=SDIF EPTB EPTA %%% II (INVERSION INDEX) IIII=SNEG SMLC 4.00 ZNEG SNEG SAVR IIFF DDFF %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% CORRECTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% CCSS=SNEG ZNEG SNEG SSBC 1015 PMSL CCOO=SNEG SSBC 20 INVS SDVC 8000 SSBC 500 PSFC CORR=SSUM CCOO CCSS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% GDI %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% GDIN=SSUM TTII IIII GDIS=SSUM CCSS SSUM TTII IIII GDIF=SSUM CORR SSUM TTII IIII %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%RELH CALCULATIONS RH19=SAVR RELH 1000 RELH 975 RH99=SAVR RELH 950 RELH 925 RHLL=SAVR RH19 RH99 RHL1=SSUM RHLL SNEG ZNEG SNEG SSBC 900 PSFC RH65=SAVR RELH 600 RELH 550 RH54=SAVR RELH 500 RELH 400 RHML=SAVR RH65 RH54 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%THICKNESS 1000-500 TH15=SDIF HGHT 500 HGHT 1000 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@ GDCI (GALVEZ-DAVISON CONVECTIVE INSTABILITY INDEX) @@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% BASE CALCULATIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% LAYER AVERAGED THETAES (HEAT+MOISTURE INDICATORS) %%%% Atmosphere is broken into 3 layers. A near-ground one %%%% (A), a mid-tropospheric one (C), and an intermediate %%%% one (B). The latter is often affected by dry air due %%%% to subsidence inversions, and is later used for that %%%% matter. Thetae is a useful conservative variable that %%%% considers the combined effects of heat and moisture. %%%% Layer averages are calculated and stored in variables %%%% TEA7, TEB7 and TEC7 for the three layers. Note that a %%%% factor of 20 is subtracted since there is appears to %%%% a calculation error in Wingridds that creates theta-e %%%% values ~20 K higher. TEA7=SSBC 20 SAVR THTE 975 THTE 950 TEB7=SSBC 20 SAVR THTE 850 THTE 700 TEC7=SSBC 20 SAVR THTE 600 THTE 500 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% THERMAL CORE FACTOR %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% THERMAL CORE: Region with ample heat/moisture content %%%% that penetrate into the low/mid troposphere. In the %%%% tropics & subtropics these tend to regions prone for %%%% convection and rainfall, usually associated with the %%%% ample content of heat and moisture in the column. %%%% The presence of high theta-es at mid-levels can often %%%% be associated with thermal cores thus good potential %%%% for convection. This is summarized in variable TEC7. %%%% This potential is greatly enhanced if a warm & moist %%%% airmass is present near the ground TEA7, so a factor %%%% for mid-tropospheric theta-e FTC7 is enhanced when a %%%% high theta-es exist at low-levels via multiplication %%%% by a near-ground theta-e factor FTA7. A thermal core %%%% factor TCF7 is then attained. Interpretation: values %%%% of TFC7 range from 0 to ~90. The larger the value the %%%% better the chance for a thermal core to exist. FTC7=SSBC 303 TEC7 FTA7=ZNEG SMLC 0.05 SSBC 303 TEA7 TCF7=SMLT FTA7 FTC7 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% MID-LEVEL COOLING %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% MID-LEVEL COOLING/ENHANCEMENT DUE TO TUTTs %%%% Cooler temperatures at mid-levels do decrease column %%%% stability enhancing convection. The Mid-Level Factor %%%% MLF7 is calculated using 500 hPa temperatures. The %%%% approach is to decrease the potential for convection %%%% once warmer temperatures are present. So values of %%%% T500<-10 are masked. Once temperatures increase from %%%% -10C, the potential for convection decreases in the %%%% form of values of MLF7 that are more negative. MLT7=ZNEG SADC 10 TEMP 500 MLF7=SNEG SMLC 3.5 MLT7 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% FINAL THERMAL CORE INDEX %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% It is just the addition of the TCF7 (Thermal Core Fc) %%%% and the MLF7 (Mid-Level Temperature Fc.). TCI7>20 are %%%% indicators of good chance for strong convection. When %%%% TCI>40 the chance for convection is high. Note that %%%% these are not corrected for orography, so chances for %%%% strong convection are overestimated on mountains. The %%%% problem arises from TEA7 since it considers the 975- %%%% 950hPa layer. TCI7=SSUM MLF7 TCF7 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% INVERSION/DRYING INDEX %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% Inversions and dry air masses play a strong role in %%%% decreasing the potential for convection & heavy rain %%%% in the tropics and subtropics, so an inversion factor %%%% INF7 is calculated. The drying with height is first %%%% assessed via the drying index DRI7 or the difference %%%% of theta-e between the 850-700 hPa layer and that of %%%% the 950-975 hPa layer. When this difference is large %%%% strong drying with height is present, often together %%%% with a subsidence inversion. This is a common layer %%%% for inversions in the Caribbean, but also works for %%%% tropical South America. Inversions/drying that reach %%%% as far down as 950 hPa are only common in cold-water %%%% coasts such as coastal Peru/Ecuador. To place weight %%%% to the temperature inversion itself aside from the %%%% drying, a vertical temperature difference is computed %%%% between 950 and 700 hPa. This becomes the Temperature %%%% Inversion Index (TII7). The smaller the decrease the %%%% more stable the air mass. These are then combined in %%%% an Inversion Factor (INF7). Its values are negative. %%%% The stronger the inversion/drying, the more negative %%%% INF7. Moderate inversions appear under INF7<-10 and %%%% strong inversions when INF7<-20. DRI7=SDIF TEA7 TEB7 TII7=SDIF TEMP 700 TEMP 950 INF7=SMLC 2.50 SNEG ZNEG SAVR DRI7 TII7 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% CORRECTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% The index is corrected for orography (CRO7) and for %%%% sea-level pressure (CRP7). Since the index considers %%%% thermodynamic properties at 975 and 950 hPa crucial, %%%% problems occur in mountains due to interpolation of %%%% some fields. Without CRO7 escessively large values %%%% occur over mountain ranges. CRO7 decreases these via %%%% surface pressure. Still, the final index should be %%%% used with care in elevations above 1500/2000 mASL. %%%% A pressure correction is then applied. The phylosophy %%%% is to reduce excessive values in tropical regions %%%% and allow for some final index structure to appear. %%%% CRP7 decreases the index for pressures below 1015 hPa %%%% leading to more negative values for lower pressures. CRO7=SMLC 1.5 SNEG SSBC 20 INVS SDVC 9000 SSBC 500 PSFC CRP7=SMLC 1.5 SNEG ZNEG SNEG SSBC 1015 PMSL COR7=SSUM CRO7 CRP7 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%% GDCI (GALVEZ-DAVISON CONVECTIVE INSTABILITY INDEX) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% The index is the addition of the thermal core index, %%%% the inversion factor, and the corrections. GDCI=SSUM COR7 SSUM TCI7 INF7 @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@ OTHER INDICES @@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% BASE CALCULATIONS: DIVERGENCE %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% DV19=SAVR DVRG WIND 975 DVRG WIND 950 DV99=SAVR DVRG WIND 925 DVRG WIND 900 DV43=SAVR DVRG WIND 400 DVRG WIND 300 DV22=SAVR DVRG WIND 200 DVRG WIND 250 DVLL=SMLC 100 SMLC 1000 SAVR DV19 DV99 DVUU=SMLC 100 SMLC 1000 SAVR DV43 DV22 WWL1=VAVR WIND 950 WIND 925 WWL2=VAVR WIND 900 WIND 850 ORO1=SDIF PMSL PSFC DVL1=ORO1 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% GDCI PLUS DYNAMICS: EFFECTS OF DIVERGENCE %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%% This index adds the effects of divergence into the %%%% GDCI resulting in a GDCI twiked with synoptic-scale %%%% dynamics. It first adds an upper divergence factor %%%% UDF8 that uses a 5-times-smoothed divergence of the %%%% 400-200 hPa layer (DVUF). Values of convergence are %%%% then removed using ZNEG, since the goal was to focus %%%% on enhancement by upper divergence. Inhibition by %%%% upper convergence was not included since tropical %%%% convection below the mid-troposphere can still lead %%%% to locally heavy rainfall. A factor of 1 was then %%%% added to produce UDF8. This leads to values of UDF8 %%%% that range from 1 to ~3 that are then multiplied to %%%% the GDCI to produce significant enhancement in areas %%%% where the GDCI is already high. Another factor is %%%% positive low-level divergence LDF8, important in the %%%% stimulation of subsidence and convection inhibition. %%%% Low-level convergence is ignored using ZNEG and the %%%% divergent values are set to negative using SNEG. So %%%% LDF8 is an inhibitor and decreases index values. The %%%% layers for low-level divergence DVLL used were 975 %%%% hPa to 900 hPa, to place strong emphasis near the %%%% ground and diurnally triggered circulations. DVUF=SMTH SMTH SMTH SMTH SMTH DVUU DVLF=SMLC 12 SMTH SMTH DVLL UDF8=SADC 1 SMLC 0.20 ZNEG DVUF LDF8=SNEG ZNEG DVLF GDCD=SSUM LDF8 SMLT UDF8 GDCI @@@@@@@@@@@@@@@@@@@@@@@@@@ 500 HPA WINDS AND TEMPERATURES TTML=SMLC 10 TEMP 500 WW54=VAVR WIND 500 WIND 400 @@@@@@@@@@@@@@@@@@@@@@@@@@@ FOG PRODUCTS @@ smbl=saturation marine boundary layer @@ sfms=saturation for marine stratus @@ slpm=sea level pressure modified SMBL=SMLC 10 SDIF TEMP 975 DWPT 975 SFMS=SMLC 10 SDIF TEMP 950 DWPT 950 SLPM=SMLC 10 SSBC 1000 PMSL