*          ATLANTIC TC GENESIS INDEX           *
                      *                GFS VERSION                   *
                      *           AL982020 09/17/20 00 UTC           *

TIME (hr)           0     6    12    18    24    36    48    60    72    84    96   108   120
Prob of Genesis                                       45%                                 74%

LAT  (deg N)      9.5   9.7  10.0  10.5  11.0  12.1  13.1  14.4  15.8  16.4  16.6  16.9  17.4
LON  (deg W)     25.6  26.7  27.9  29.3  30.8  33.8  36.4  39.0  41.5  43.7  45.1  45.9  46.7
DTL  (km)        1006  1115  1234  1365  1501  1786  1822  1766  1691  1594  1523  1506  1515
TRACK SOURCE     AP04  AP04  AP04  AP04  AP04  AP04  AP04  AP04  AP04  AP04  AP04  AP04  AP04

TCGI  0-48h Genesis Forecast:   45% is  1.5 times the sample mean (  30%)
TCGI 0-120h Genesis Forecast:   74% is  1.7 times the sample mean (  43%)

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INDIVIDUAL PREDICTOR CONTRIBUTIONS TO PROBABILITY OF GENESIS 

               *******  48-HR ******   ******* 120-HR ******
                   AVG   TCGI   CONT       AVG   TCGI   CONT
DIVERGENCE        -1.0   -3.8  12.6%       1.0   -2.1  18.2%
VORTICITY          1.7    2.4  10.9%       1.4    2.7  25.4%
VERTICAL SHEAR    16.3   17.3  14.6%      18.4   18.6  19.2%
RH                73.1   75.5  -0.2%      70.9   71.0   3.4%
GOES              29.1   17.2   0.8%      29.3   17.2   0.6%
DVORAK             0.8    1.0   6.3%       0.8    1.0   6.8%

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PREDICTOR DEFINITIONS (Averaged Over 500 km Radius)

GENESIS CLIM   = Climatological Prob (%) of Genesis (Source: NHC-TAFB Invest Database) 
DIVERGENCE     = GFS 850 hPa Horizontal Divergence (x10-7 s-1)
VORTICITY      = GFS 850 hPa Vorticity (x10-6 s-1)
VERTICAL SHEAR = GFS 200-850 hPa Vertical Shear (kt)
RH             = GFS 600-850 hPa Relative Humidity (%)
GOES           = GOES Water Vapor Pixels Colder than -40C (%)
DVORAK         = Dvorak T-number, source: TAFB

Version 3.0, July 2018