*          ATLANTIC TC GENESIS INDEX           *
                      *           AL942015 07/30/15 12 UTC           *

TIME (hr)           0     6    12    18    24    36    48    60    72    84    96   108   120
TCGI (%)                                             27.4                                37.5

HDIV (x10-7s-1)   0.0   0.0   1.0   1.0  -2.0   3.0   1.0  -2.0  -1.0  -3.0   0.0  -2.0  -1.0
VORT (x10-6s-1)   2.0   2.1   2.1   1.8   1.7   1.7   1.5   1.2   1.2   0.9   0.9   0.3  -0.3
DV24 (x10-6s-1)  -0.3  -0.1  -0.4  -0.3  -0.2  -0.5  -0.3  -0.3  -0.3  -0.6  -1.2  -0.8  -0.5
VSHD (kt)          11    11    10    12    10     9    12    16    15    15     8     5     7
MLRH (%)           75    77    80    84    81    74    69    66    65    64    69    80    83
PCCD (%)           33   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)     12.4  12.4  12.4  12.4  12.3  12.0  11.6  10.9   9.9   9.0   8.7   8.8   8.9
LON  (deg W)     26.4  27.7  28.9  30.0  31.2  33.8  36.2  38.2  40.0  41.3  42.2  43.4  44.9
DTL  (km)         997  1133  1259  1376  1505  1789  1665  1546  1378  1217  1114  1006   880
TRACK SOURCE     AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI

Prob of Genesis (t= 48h) =  27.4 is  1.0 times the sample mean ( 27.9)
Prob of Genesis (t=120h) =  37.5 is  0.9 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                    40.3
HDIV (x10-7s-1)   -1.3    0.7   -5.1      -1.2   -0.5   -5.3
DV24 (x10-6s-1)   -0.2   -0.3   -2.0      -0.2   -0.5   -7.0
VSHD (kt)         16.8   10.7    4.6      19.0   11.0    7.2
MLRH (%)          64.9   76.5   -0.1      61.3   73.2   -0.3
PCCD (%)          29.1   33.4    0.7      28.7   33.4    0.7
TNUM               0.9    1.0    1.5       0.9    1.0    1.8

%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