*          ATLANTIC TC GENESIS INDEX           *
                      *                GFS VERSION                   *
                      *           AL912020 09/04/20 00 UTC           *

TIME (hr)           0     6    12    18    24    36    48    60    72    84    96   108   120
Prob of Genesis                                       20%                                 48%

LAT  (deg N)     11.3  11.1  10.8  10.5  10.2  10.2  10.8  12.1  12.3  12.2  12.2  12.4  13.6
LON  (deg W)     36.7  37.8  38.9  39.2  39.4  39.6  38.5  36.3  33.1  32.1  30.7  29.3  27.5
DTL  (km)        1619  1574  1519  1475  1435  1426  1531  1716  1707  1603  1455  1302  1085
TRACK SOURCE     AP15  AP15  AP15  AP15  AP15  AP15  AP15  AP15  AP15  AP15  AP15  AP15  AP15

TCGI  0-48h Genesis Forecast:   20% is  0.7 times the sample mean (  30%)
TCGI 0-120h Genesis Forecast:   48% is  1.1 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   -2.1   5.7%       1.0   -1.3  12.5%
VORTICITY          1.7    1.2   4.1%       1.4    1.3  12.7%
VERTICAL SHEAR    16.3   25.0   6.4%      18.4   22.4  13.8%
RH                73.1   72.3  -0.1%      70.9   74.2   3.2%
GOES              29.1   12.1   0.4%      29.3   12.1   0.4%
DVORAK             0.8    1.0   3.8%       0.8    1.0   5.5%

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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