* ATLANTIC TC GENESIS INDEX * * GFS VERSION * * AL972023 09/10/23 18 UTC * TIME (hr) 0 6 12 18 24 36 48 60 72 84 96 108 120 Prob of Genesis 45% 83% LAT (deg N) 13.4 13.4 13.2 13.0 12.8 12.4 12.2 12.2 11.9 11.7 12.2 12.9 13.2 LON (deg W) 28.4 29.3 29.9 30.5 30.9 31.4 31.7 32.2 33.2 34.4 36.2 38.6 41.0 DTL (km) 1184 1281 1348 1416 1463 1524 1561 1614 1727 1736 1729 1697 1516 TRACK SOURCE AVNI AVNI AVNI AVNI AVNI AVNI AVNI AVNI AVNI AVNI AVNI AVNI AVNI TCGI 0-48h Genesis Forecast: 45% is 1.5 times the sample mean ( 30%) TCGI 0-120h Genesis Forecast: 83% is 1.9 times the sample mean ( 43%) --------------------------------------------------------------------------------------------- INDIVIDUAL PREDICTOR CONTRIBUTIONS TO PROBABILITY OF GENESIS ******* 48-HR ****** ******* 120-HR ****** AVG TCGI CONT AVG TCGI CONT DIVERGENCE -1.0 -1.8 8.9% 1.0 -3.2 22.8% VORTICITY 1.7 1.4 7.5% 1.4 2.1 21.9% VERTICAL SHEAR 16.3 12.1 17.4% 18.4 13.3 22.9% RH 73.1 76.5 -0.2% 70.9 82.0 2.7% GOES 29.1 8.1 0.4% 29.3 8.1 0.3% DVORAK 0.8 1.5 10.9% 0.8 1.5 11.9% --------------------------------------------------------------------------------------------- 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 2.1, February 2018