*          ATLANTIC TC GENESIS INDEX           *
                      *           AL902015 09/30/15 18 UTC           *

TIME (hr)           0     6    12    18    24    36    48    60    72    84    96   108   120
TCGI (%)                                             54.1                                54.1

HDIV (x10-7s-1)  -4.0  -4.0  -5.0  -4.0  -1.0  -3.0   1.0  -1.0   2.0   1.0  -1.0  -2.0  -1.0
VORT (x10-6s-1)   2.0   2.4   2.8   3.2   3.4   3.6   4.0   3.5   2.5   1.9   2.0   2.2   2.7
DV24 (x10-6s-1)   1.4   1.3   0.8   0.7   0.6  -0.1  -1.5  -1.6  -0.5   0.3   0.7   0.1  -0.6
VSHD (kt)           9    14    16    15    16    25    16    13    14    13    18    24    21
MLRH (%)           68    71    72    73    74    73    65    58    60    62    71    76    79
PCCD (%)           46   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A
TNUM             1.00   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A   N/A

LAT  (deg N)     25.4  25.7  25.8  25.8  25.8  26.0  26.5  27.3  27.9  28.3  28.3  28.3  28.3
LON  (deg W)     57.5  57.4  57.5  57.6  57.2  56.5  56.6  57.4  57.7  57.4  57.1  57.2  57.5
DTL  (km)        1156  1186  1186  1179  1208  1276  1305  1312  1344  1397  1416  1409  1391
TRACK SOURCE     AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI

Prob of Genesis (t= 48h) =  54.1 is  1.9 times the sample mean ( 27.9)
Prob of Genesis (t=120h) =  54.1 is  1.3 times the sample mean ( 40.3)

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CONTRIBUTIONS OF CLIMATOLOGY AND INDIVIDUAL PREDICTORS TO TCGI PROBABILITY  

               *******  48-HR ******   ******* 120-HR ******
                   AVG   FCST  %CONT       AVG   FCST  %CONT
CLIM (%)                        27.9                     N/A
HDIV (x10-7s-1)   -1.3   -2.3    6.8      -1.3   -2.3    6.8
DV24 (x10-6s-1)   -0.2    0.3   11.9      -0.2    0.3   11.9
VSHD (kt)         16.8   16.6    0.3      16.8   16.6    0.3
MLRH (%)          64.9   70.6    0.4      64.9   70.6    0.4
PCCD (%)          29.1   45.7    4.4      29.1   45.7    4.4
TNUM               0.9    1.0    2.5       0.9    1.0    2.5

%CONT = % contribution to TCGI probability

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PREDICTOR DEFINITIONS (Averaged Over 500 km Radius)

CLIM = Climatological Probability of Genesis (Source: NHC-TAFB Invest Database) 
HDIV = 850-mb GFS Horizontal Divergence
DV24 = 24-hr Change in GFS 850-mb Vorticity (VORT)
VSHD = 850-200 mb GFS Vertical Shear
MLRH = 600-mb GFS Relative Humidity
PCCD = % GOES WV Pixels Colder Than -40C
TNUM = TAFB T-Number