*          ATLANTIC TC GENESIS INDEX           *
                      *                GFS VERSION                   *
                      *           AL972021 08/28/21 06 UTC           *

TIME (hr)           0     6    12    18    24    36    48    60    72    84    96   108   120
Prob of Genesis                                       22%                                 36%

LAT  (deg N)     32.3  32.6  32.9  33.1  33.7  36.9  37.9  40.0  43.2  46.9  48.6  51.3  55.7
LON  (deg W)     51.7  51.5  51.2  50.3  49.3  45.6  42.4  38.6  35.2  33.9  34.2  34.5  34.0
DTL  (km)        1604  1572  1542  1529  1480  1253  1315  1388  1460  1427  1384  1357  1444
TRACK SOURCE     AP10  AP10  AP10  AP10  AP10  AP10  AP10  AP10  AP10  AP10  TABM  TABM  TABM

TCGI  0-48h Genesis Forecast:   22% is  0.7 times the sample mean (  30%)
TCGI 0-120h Genesis Forecast:   36% is  0.8 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   -1.7   5.4%       1.0   -0.9   9.3%
VORTICITY          1.7    1.7   5.4%       1.4    1.8  12.6%
VERTICAL SHEAR    16.3   25.0   6.8%      18.4   30.7   8.0%
RH                73.1   59.4  -0.1%      70.9   59.6   1.2%
GOES              29.1    2.5   0.1%      29.3    2.5   0.1%
DVORAK             0.8    1.0   4.0%       0.8    1.0   4.5%

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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