*          ATLANTIC TC GENESIS INDEX           *
                      *                GFS VERSION                   *
                      *           AL922020 09/07/20 00 UTC           *

TIME (hr)           0     6    12    18    24    36    48    60    72    84    96   108   120
Prob of Genesis                                       75%                                 92%

LAT  (deg N)     16.9  16.5  16.3  16.2  16.1  16.8  17.4  17.6  17.9  18.2  18.9  20.8  21.7
LON  (deg W)     41.1  41.9  42.4  42.6  42.9  43.0  44.6  46.3  48.0  50.0  51.1  53.5  54.8
DTL  (km)        1813  1725  1674  1652  1624  1676  1627  1554  1504  1441  1393  1307  1199
TRACK SOURCE     AP09  AP09  AP09  AP09  AP09  AP09  AP09  AP09  AP09  AP09  AP09  AP09  AP09

TCGI  0-48h Genesis Forecast:   75% is  2.5 times the sample mean (  30%)
TCGI 0-120h Genesis Forecast:   92% is  2.1 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   -0.4   8.5%       1.0   -0.3  12.3%
VORTICITY          1.7    3.8  20.2%       1.4    3.6  33.4%
VERTICAL SHEAR    16.3    7.4  26.1%      18.4   10.8  24.7%
RH                73.1   77.6  -0.3%      70.9   73.7   3.9%
GOES              29.1    7.2   0.5%      29.3    7.2   0.3%
DVORAK             0.8    2.0  20.3%       0.8    2.0  17.1%

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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