*          ATLANTIC TC GENESIS INDEX           *
                      *                GFS VERSION                   *
                      *           AL172020 09/21/20 00 UTC           *

TIME (hr)           0     6    12    18    24    36    48    60    72    84    96   108   120
Prob of Genesis                                       16%                                 21%

LAT  (deg N)     34.4  33.9  33.7  33.6  33.6  33.8  33.8  33.0  32.5  31.8  30.0  29.6  29.0
LON  (deg W)     30.8  30.8  30.0  28.8  26.8  22.7  19.7  17.7  15.4  14.9  15.0  16.2  14.8
DTL  (km)        1826  1802  1726  1620  1458  1134   915   723   525   470   303   364   214
TRACK SOURCE     AP12  AP12  AP12  AP12  AP12  AP12  AP12  AP12  AP12  AP12  AP12  AP12  AP12

TCGI  0-48h Genesis Forecast:   16% is  0.5 times the sample mean (  30%)
TCGI 0-120h Genesis Forecast:   21% is  0.5 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    1.3   1.5%       1.0    0.8   3.5%
VORTICITY          1.7    2.7   5.7%       1.4    1.9   9.1%
VERTICAL SHEAR    16.3   15.5   7.6%      18.4   22.0   7.8%
RH                73.1   52.9   0.0%      70.9   50.1   0.2%
GOES              29.1    0.0   0.0%      29.3    0.0   0.0%
DVORAK             0.8    0.5   0.9%       0.8    0.5   0.9%

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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