*          ATLANTIC TC GENESIS INDEX           *
                      *                GFS VERSION                   *
                      *           AL902021 05/20/21 18 UTC           *

TIME (hr)           0     6    12    18    24    36    48    60    72    84    96   108   120
Prob of Genesis                                       32%                                 54%

LAT  (deg N)     35.4  35.9  35.8  34.8  33.6  32.7  34.2  33.7  33.5  34.4  35.4  37.2  38.9
LON  (deg W)     55.2  57.1  59.5  61.9  63.1  63.2  64.3  65.1  63.7  60.9  56.4  50.7  49.4
DTL  (km)        1201  1089   997  1015  1105  1185   990  1003  1085  1086  1162  1074   920
TRACK SOURCE     AP05  AP05  AP05  AP05  AP05  AP05  AP05  AP05  AP05  AP05  AP05  AP05  TABM

TCGI  0-48h Genesis Forecast:   32% is  1.1 times the sample mean (  30%)
TCGI 0-120h Genesis Forecast:   54% is  1.3 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   -1.0   6.3%       1.0    0.0   9.5%
VORTICITY          1.7    4.3  14.4%       1.4    3.2  25.2%
VERTICAL SHEAR    16.3   26.0   8.7%      18.4   23.9  14.0%
RH                73.1   66.1  -0.1%      70.9   60.8   1.8%
GOES              29.1   38.7   1.6%      29.3   38.7   1.3%
DVORAK             0.8    0.5   1.5%       0.8    0.5   1.7%

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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