*          ATLANTIC TC GENESIS INDEX           *
                      *           AL962015 08/17/15 06 UTC           *

TIME (hr)           0     6    12    18    24    36    48    60    72    84    96   108   120
TCGI (%)                                             71.2                                88.8

HDIV (x10-7s-1)  -4.0  -5.0  -5.0  -5.0  -5.0  -4.0  -5.0  -3.0  -2.0   0.0   0.0  -2.0  -1.0
VORT (x10-6s-1)   1.4   1.3   1.2   1.2   1.1   1.3   1.5   1.2   1.4   1.4   1.5   1.6   2.0
DV24 (x10-6s-1)  -0.3  -0.2   0.1   0.1   0.4  -0.1  -0.1   0.2   0.1   0.2   0.5   0.5   0.0
VSHD (kt)           4     8     6     3     1     6     9     3     4     7     8     8     4
MLRH (%)           73    75    77    79    80    76    75    69    60    54    56    57    69
PCCD (%)           40   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)     10.1  10.1  10.3  10.4  10.6  11.2  11.8  12.3  12.8  13.0  12.9  12.9  12.6
LON  (deg W)     30.0  30.7  31.1  31.5  31.9  33.1  34.8  36.0  36.6  37.1  38.0  38.7  39.5
DTL  (km)        1453  1524  1557  1595  1629  1735  1732  1746  1784  1795  1750  1688  1598
TRACK SOURCE     AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI  AVNI

Prob of Genesis (t= 48h) =  71.2 is  2.6 times the sample mean ( 27.9)
Prob of Genesis (t=120h) =  88.8 is  2.2 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   -4.7   18.4      -1.2   -3.0   21.5
DV24 (x10-6s-1)   -0.2    0.0    5.4      -0.2    0.2    9.4
VSHD (kt)         16.8    5.3   14.3      19.0    5.7   13.1
MLRH (%)          64.9   76.2   -0.1      61.3   67.1    0.7
PCCD (%)          29.1   40.1    2.9      28.7   40.1    1.9
TNUM               0.9    1.0    2.5       0.9    1.0    2.0

%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