* NE PACIFIC TC GENESIS INDEX * * GFS VERSION * * EP982020 07/13/20 12 UTC * TIME (hr) 0 6 12 18 24 36 48 60 72 84 96 108 120 Prob of Genesis 25% 25% LAT (deg N) 16.0 15.5 14.9 14.7 14.9 16.5 16.5 16.3 16.0 15.7 15.4 15.2 15.0 LON (deg W) 111.3 112.5 114.7 116.2 117.7 118.6 121.7 125.0 128.7 132.5 136.2 139.8 143.5 DTL (km) 763 863 1017 1120 1202 1132 1343 1625 1924 2250 2020 1658 1299 TRACK SOURCE AP05 AP05 AP05 AP05 AP05 TABM TABM TABM TABM TABM TABM TABM TABM TCGI 0-48h Genesis Forecast: 25% is 0.6 times the sample mean ( 44%) TCGI 0-120h Genesis Forecast: 25% is 0.4 times the sample mean ( 56%) --------------------------------------------------------------------------------------------- INDIVIDUAL PREDICTOR CONTRIBUTIONS TO PROBABILITY OF GENESIS ******* 48-HR ****** ******* 120-HR ****** AVG TCGI CONT AVG TCGI CONT DIVERGENCE -2.0 0.2 1.4% -2.0 0.3 2.1% VORTICITY 1.6 1.3 6.9% 1.5 0.8 5.1% VERTICAL SHEAR 12.9 11.5 7.8% 14.9 18.0 11.6% RH 79.1 71.4 3.4% 74.8 69.6 2.5% GOES 42.9 20.2 2.0% 42.8 20.2 1.5% DVORAK 0.9 1.0 3.7% 0.9 1.0 2.3% --------------------------------------------------------------------------------------------- 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