* GFS version * * ATLANTIC 2026 SHIPS INTENSITY FORECAST * * IR SAT DATA AVAILABLE, OHC AVAILABLE * * INVEST AL982026 09/17/26 18 UTC * TIME (HR) 0 6 12 18 24 36 48 60 72 84 96 108 120 132 144 156 168 V (KT) NO LAND 20 19 20 21 22 23 26 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A V (KT) LAND 20 19 20 21 22 23 26 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A V (KT) LGEM 20 18 17 17 17 17 17 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Storm Type TROP TROP TROP TROP TROP TROP TROP N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A SHEAR (KT) 18 21 28 27 14 0 9 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A SHEAR ADJ (KT) 0 0 -5 -4 -1 1 0 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A SHEAR DIR 37 29 37 57 67 94 246 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A SST (C) 28.5 28.3 28.1 27.8 27.7 27.6 27.5 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A POT. INT. (KT) 142 138 136 133 131 127 128 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 200 MB T (C) -55.4 -55.1 -55.2 -55.1 -55.0 -55.2 -55.3 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 200 MB VXT (C) -0.3 -0.2 0.0 0.0 0.0 0.0 0.0 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A TH_E DEV (C) 8 8 8 7 6 4 3 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 700-500 MB RH 53 50 50 48 48 46 43 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A MODEL VTX (KT) 3 2 1 LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST LOST 850 MB ENV VOR -55 -56 -62 -63 -47 -29 -6 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 200 MB DIV -29 -46 -25 -34 -16 1 1 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 700-850 TADV 0 -2 -1 0 8 -7 -15 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A LAND (KM) 1276 1235 1193 1118 1042 960 1066 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A LAT (DEG N) 33.0 xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x xx.x LONG(DEG W) 59.7 xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x xxx.x STM SPEED (KT) 5 4 5 7 5 2 6 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A HEAT CONTENT 16 15 14 20 29 29 20 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A FORECAST TRACK FROM OFPI INITIAL HEADING/SPEED (DEG/KT):280/ 7 CX,CY: -6/ 1 T-12 MAX WIND: 25 PRESSURE OF STEERING LEVEL (MB): 645 (MEAN=620) GOES IR BRIGHTNESS TEMP. STD DEV. 50-200 KM RAD: 10.5 (MEAN=14.5) % GOES IR PIXELS WITH T < -20 C 50-200 KM RAD: 9.0 (MEAN=65.0) PRELIM RI PROB (DV .GE. 35 KT IN 36 HR): 0.4 INDIVIDUAL CONTRIBUTIONS TO INTENSITY CHANGE 6 12 18 24 36 48 60 72 84 96 108 120 132 144 156 168 -------------------------------------------------------------------------------------------- SAMPLE MEAN CHANGE 1. 2. 3. 5. 6. 8. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. SST POTENTIAL -0. -1. -1. -1. -1. 1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. VERTICAL SHEAR MAG 2. 5. 7. 9. 11. 11. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. VERTICAL SHEAR ADJ 0. 0. 1. 1. 2. 2. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. VERTICAL SHEAR DIR -0. -0. -1. -1. -2. -1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. PERSISTENCE -1. -2. -2. -2. -1. -1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 200/250 MB TEMP. 0. 0. 0. 1. 1. 1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. THETA_E EXCESS 0. -0. -0. -0. -1. -1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 700-500 MB RH 0. 0. 0. 0. 1. 1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. MODEL VTX TENDENCY -0. -1. -2. -2. -3. -4. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 850 MB ENV VORTICITY -0. -1. -1. -1. -2. -2. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 200 MB DIVERGENCE -0. -1. -1. -2. -2. -2. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 850-700 T ADVEC 0. -0. -0. -0. -0. -1. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. ZONAL STORM MOTION -0. -0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. STEERING LEVEL PRES -0. -0. -0. -0. -0. -0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. DAYS FROM CLIM. PEAK -0. -0. -0. -0. -0. -0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. GOES PREDICTORS -1. -1. -1. -1. -2. -3. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. OCEAN HEAT CONTENT 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. RI POTENTIAL -0. -1. -2. -3. -4. -4. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. -------------------------------------------------------------------------------------------- TOTAL CHANGE -1. -0. 1. 2. 3. 6. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. CURRENT MAX WIND (KT): 20. LAT, LON: 33.0 59.7 ** 2026 ATLANTIC RI INDEX AL982026 INVEST 09/17/26 18 UTC ** (SHIPS-RII PREDICTOR TABLE for 30 KT OR MORE MAXIMUM WIND INCREASE IN NEXT 24-h) Predictor Value RI Predictor Range Scaled Value(0-1) % Contribution 12 HR PERSISTENCE (KT) : -5.0 -49.5 to 33.0 0.54 9999.0 MULTI-LAYER SHEAR (KT) : 27.5 46.9 to 6.8 0.48 9999.0 OCEAN HEAT CONTENT(KJ/CM2) : 19.0 0.0 to 155.1 0.12 9999.0 MAXIMUM WIND (KT) : 20.0 22.5 to 137.5 0.00 0.0 STD DEV OF IR BR TEMP : 10.5 36.6 to 2.8 0.77 9999.0 BL DRY-AIR FLUX (W/M2) : 143.8 895.4 to -69.3 0.78 9999.0 POT = MPI-VMAX (KT) : 90.5 30.0 to 152.9 0.49 9999.0 Avg. IR BT 0-120 km (deg C) : 16.5 -4.5 to -89.2 0.00 0.0 D200 (10**7s-1) : -30.0 -29.7 to 189.2 0.00 0.0 %area of TPW <45 mm upshear : 43.7 100.0 to 0.0 0.56 9999.0 SHIPS Prob RI for 20kt/ 12hr RI threshold= 0% is 0.0 times climatological mean ( 4.9%) SHIPS Prob RI for 25kt/ 24hr RI threshold= 0% is 0.0 times climatological mean (10.9%) SHIPS Prob RI for 30kt/ 24hr RI threshold= 0% is 0.0 times climatological mean ( 6.8%) SHIPS Prob RI for 35kt/ 24hr RI threshold= 0% is 0.0 times climatological mean ( 3.9%) SHIPS Prob RI for 40kt/ 24hr RI threshold= 0% is 0.0 times climatological mean ( 2.4%) SHIPS Prob RI for 45kt/ 36hr RI threshold= 0% is 0.0 times climatological mean ( 4.6%) SHIPS Prob RI for 55kt/ 48hr RI threshold= 0% is 0.0 times climatological mean ( 4.7%) SHIPS Prob RI for 65kt/ 72hr RI threshold= 0% is 0.0 times climatological mean ( 5.3%) Matrix of RI probabilities ------------------------------------------------------------------------------ RI (kt / h) | 20/12 | 25/24 | 30/24 | 35/24 | 40/24 | 45/36 | 55/48 |65/72 ------------------------------------------------------------------------------ SHIPS-RII: 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Logistic: 0.9% 1.9% 1.0% 0.4% 0.2% 1.3% 0.5% 0.5% Bayesian: 0.0% 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Consensus: 0.3% 0.7% 0.3% 0.1% 0.1% 0.4% 0.2% 0.2% DTOPS: 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% SDCON: 0.1% 0.3% 0.1% 0.0% 0.0% 0.2% 0.1% 0.1% ## ANNULAR HURRICANE INDEX (AHI) AL982026 INVEST 09/17/26 18 UTC ## ## STORM NOT ANNULAR, SCREENING STEP FAILED, NPASS=5 NFAIL=2 ## ## AHI= 0 (AHI OF 100 IS BEST FIT TO ANN. STRUC., 1 IS MARGINAL, 0 IS NOT ANNULAR) ## ** PROBLTY OF AT LEAST 1 SCNDRY EYEWL FORMTN EVENT AL982026 INVEST 09/17/2026 18 UTC ** TIME(HR) 0-12 12-24(0-24) 24-36(0-36) 36-48(0-48) CLIMO(%) 0 0( 0) 0( 0) 0( 0) <-- PROB BASED ON INTENSITY ONLY PROB(%) 0 0( 0) 0( 0) 0( 0) <-- FULL MODEL PROB (RAN NORMALLY) ** DSHIPS INTENSITY FORECAST ADJUSTED RELATIVE TO ONSET OF ERC WEAKENING PHASE ** TIME (HR) 0 6 12 18 24 36 48 60 72 84 96 108 120 132 144 156 168 >24HR AGO (DSHIPS) 20 19 20 21 22 23 26 DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS 18HR AGO 20 19 20 21 22 23 26 DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS 12HR AGO 20 17 16 17 18 19 22 DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS 6HR AGO 20 DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS NOW CURRENT INTENSITY < 83 KT IN 6HR INTENSITY IN 6HR < 83 KT IN 12HR INTENSITY IN 12HR < 83 KT