* NE PACIFIC TC GENESIS INDEX * * GFS VERSION * * EP992021 07/27/21 18 UTC * TIME (hr) 0 6 12 18 24 36 48 60 72 84 96 108 120 Prob of Genesis 23% 71% LAT (deg N) 12.2 14.0 14.3 14.1 13.8 13.4 12.9 12.5 12.4 13.4 16.0 16.5 16.5 LON (deg W) 116.2 116.6 118.0 119.3 120.0 121.2 122.7 123.9 123.8 123.3 122.9 125.3 128.1 DTL (km) 1358 1209 1274 1384 1461 1574 1716 1832 1834 1714 1474 1636 1842 TRACK SOURCE AP16 AP16 AP16 AP16 AP16 AP16 AP16 AP16 AP16 AP16 AP16 AP16 AP16 TCGI 0-48h Genesis Forecast: 23% is 0.5 times the sample mean ( 44%) TCGI 0-120h Genesis Forecast: 71% is 1.3 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 -0.8 2.0% -2.0 -2.2 10.7% VORTICITY 1.6 1.5 7.1% 1.5 2.0 19.8% VERTICAL SHEAR 12.9 10.0 7.9% 14.9 9.7 29.2% RH 79.1 73.5 3.5% 74.8 76.9 6.6% GOES 42.9 18.8 1.8% 42.8 18.8 2.9% DVORAK 0.9 0.5 1.0% 0.9 0.5 1.4% --------------------------------------------------------------------------------------------- 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