* NE PACIFIC TC GENESIS INDEX * * GFS VERSION * * EP972021 07/17/21 12 UTC * TIME (hr) 0 6 12 18 24 36 48 60 72 84 96 108 120 Prob of Genesis 87% 93% LAT (deg N) 16.2 16.7 17.0 17.2 17.4 17.8 18.1 18.2 18.1 18.0 17.8 17.8 18.0 LON (deg W) 109.1 110.3 111.4 112.4 113.4 115.8 118.4 121.1 123.9 126.6 129.0 131.4 133.8 DTL (km) 562 632 671 681 706 828 975 1168 1411 1611 1814 2014 2211 TRACK SOURCE AEMI AEMI AEMI AEMI AEMI AEMI AEMI AEMI AEMI AEMI AEMI AEMI AEMI TCGI 0-48h Genesis Forecast: 87% is 2.0 times the sample mean ( 44%) TCGI 0-120h Genesis Forecast: 93% is 1.7 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 0.4 2.4% -2.0 0.6 3.9% VORTICITY 1.6 3.3 28.3% 1.5 3.4 32.9% VERTICAL SHEAR 12.9 4.2 21.5% 14.9 9.4 31.7% RH 79.1 76.1 8.7% 74.8 71.4 6.1% GOES 42.9 35.2 7.4% 42.8 35.2 6.0% DVORAK 0.9 2.0 18.3% 0.9 2.0 12.8% --------------------------------------------------------------------------------------------- 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