* GFS version * * ATLANTIC 2026 SHIPS INTENSITY FORECAST * * IR SAT DATA AVAILABLE, OHC AVAILABLE * * HANNA AL082026 09/28/26 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 40 43 44 46 47 46 43 41 38 N/A N/A N/A N/A N/A N/A N/A N/A V (KT) LAND 40 43 44 46 47 46 43 41 38 N/A N/A N/A N/A N/A N/A N/A N/A V (KT) LGEM 40 43 45 47 47 46 42 40 38 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 TROP TROP N/A N/A N/A N/A N/A N/A N/A N/A SHEAR (KT) 21 23 26 24 21 31 20 23 28 N/A N/A N/A N/A N/A N/A N/A N/A SHEAR ADJ (KT) 0 2 0 1 2 -2 0 -1 0 N/A N/A N/A N/A N/A N/A N/A N/A SHEAR DIR 264 276 292 306 312 335 339 297 270 N/A N/A N/A N/A N/A N/A N/A N/A SST (C) 26.5 26.5 26.6 27.2 27.5 27.6 27.6 27.0 25.8 N/A N/A N/A N/A N/A N/A N/A N/A POT. INT. (KT) 120 120 121 127 129 128 129 123 111 N/A N/A N/A N/A N/A N/A N/A N/A 200 MB T (C) -55.4 -55.4 -55.6 -55.6 -55.5 -55.5 -55.5 -55.6 -56.0 N/A N/A N/A N/A N/A N/A N/A N/A 200 MB VXT (C) -0.4 -0.2 0.0 -0.1 0.1 0.0 -0.1 -0.2 -0.2 N/A N/A N/A N/A N/A N/A N/A N/A TH_E DEV (C) 2 1 1 1 2 2 2 3 3 N/A N/A N/A N/A N/A N/A N/A N/A 700-500 MB RH 53 51 50 48 45 43 51 59 58 N/A N/A N/A N/A N/A N/A N/A N/A MODEL VTX (KT) 7 8 9 11 11 11 9 8 7 LOST LOST LOST LOST LOST LOST LOST LOST 850 MB ENV VOR -46 -51 -39 -19 -18 -28 -25 -40 -28 N/A N/A N/A N/A N/A N/A N/A N/A 200 MB DIV 26 0 -19 -29 -2 -46 -14 -6 14 N/A N/A N/A N/A N/A N/A N/A N/A 700-850 TADV -5 -7 -4 -6 0 5 7 10 4 N/A N/A N/A N/A N/A N/A N/A N/A LAND (KM) 1153 1246 1349 1450 1552 1625 1616 1614 1619 N/A N/A N/A N/A N/A N/A N/A N/A LAT (DEG N) 36.6 36.1 35.6 35.0 34.3 33.9 34.2 34.9 35.9 N/A N/A N/A N/A N/A N/A N/A N/A LONG(DEG W) 49.6 48.0 46.4 45.4 44.5 43.7 43.2 41.8 40.0 N/A N/A N/A N/A N/A N/A N/A N/A STM SPEED (KT) 14 14 12 10 7 3 4 8 9 N/A N/A N/A N/A N/A N/A N/A N/A HEAT CONTENT 2 4 3 0 1 7 9 5 0 N/A N/A N/A N/A N/A N/A N/A N/A FORECAST TRACK FROM OFCI INITIAL HEADING/SPEED (DEG/KT):100/ 15 CX,CY: 15/ -2 T-12 MAX WIND: 30 PRESSURE OF STEERING LEVEL (MB): 657 (MEAN=620) GOES IR BRIGHTNESS TEMP. STD DEV. 50-200 KM RAD: 25.5 (MEAN=14.5) % GOES IR PIXELS WITH T < -20 C 50-200 KM RAD: 45.0 (MEAN=65.0) PRELIM RI PROB (DV .GE. 35 KT IN 36 HR): 1.4 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. 10. 11. 0. 0. 0. 0. 0. 0. 0. 0. SST POTENTIAL 0. -0. -0. -0. -1. -2. -2. -3. 0. 0. 0. 0. 0. 0. 0. 0. VERTICAL SHEAR MAG 1. 2. 3. 4. 5. 4. 2. -0. 0. 0. 0. 0. 0. 0. 0. 0. VERTICAL SHEAR ADJ -0. 0. 0. -0. 0. 1. 1. 2. 0. 0. 0. 0. 0. 0. 0. 0. VERTICAL SHEAR DIR 0. 0. 0. 1. 1. 1. 1. 2. 0. 0. 0. 0. 0. 0. 0. 0. PERSISTENCE 2. 2. 3. 2. 2. 1. 1. 1. 0. 0. 0. 0. 0. 0. 0. 0. 200/250 MB TEMP. 0. 0. 1. 1. 1. 2. 2. 2. 0. 0. 0. 0. 0. 0. 0. 0. THETA_E EXCESS -0. -1. -1. -2. -3. -3. -4. -4. 0. 0. 0. 0. 0. 0. 0. 0. 700-500 MB RH 0. 0. 0. 0. 1. 1. 1. 1. 0. 0. 0. 0. 0. 0. 0. 0. MODEL VTX TENDENCY 0. 0. 1. 2. 2. -0. -3. -5. 0. 0. 0. 0. 0. 0. 0. 0. 850 MB ENV VORTICITY -0. -1. -1. -1. -1. -2. -2. -2. 0. 0. 0. 0. 0. 0. 0. 0. 200 MB DIVERGENCE -0. -0. -1. -1. -2. -2. -2. -2. 0. 0. 0. 0. 0. 0. 0. 0. 850-700 T ADVEC 0. -0. -0. -0. -0. -0. -0. -0. 0. 0. 0. 0. 0. 0. 0. 0. ZONAL STORM MOTION 0. 0. -0. -0. -1. -1. -1. -1. 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 -0. -1. -1. -1. -1. -1. -1. -1. 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. -1. -2. -4. -4. -3. -2. 0. 0. 0. 0. 0. 0. 0. 0. -------------------------------------------------------------------------------------------- TOTAL CHANGE 3. 4. 6. 7. 6. 3. 1. -2. 0. 0. 0. 0. 0. 0. 0. 0. CURRENT MAX WIND (KT): 40. LAT, LON: 36.6 49.6 ** 2026 ATLANTIC RI INDEX AL082026 HANNA 09/28/26 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) : 10.0 -49.5 to 33.0 0.72 3.9 MULTI-LAYER SHEAR (KT) : 32.4 46.9 to 6.8 0.36 1.1 OCEAN HEAT CONTENT(KJ/CM2) : 2.0 0.0 to 155.1 0.01 0.0 MAXIMUM WIND (KT) : 40.0 22.5 to 137.5 0.45 0.7 STD DEV OF IR BR TEMP : 25.5 36.6 to 2.8 0.33 0.7 BL DRY-AIR FLUX (W/M2) : 226.4 895.4 to -69.3 0.69 1.1 POT = MPI-VMAX (KT) : 64.4 30.0 to 152.9 0.28 0.2 Avg. IR BT 0-120 km (deg C) : -8.8 -4.5 to -89.2 0.05 0.0 D200 (10**7s-1) : -4.8 -29.7 to 189.2 0.11 0.1 %area of TPW <45 mm upshear : 36.4 100.0 to 0.0 0.64 -0.2 SHIPS Prob RI for 20kt/ 12hr RI threshold= 2% is 0.3 times climatological mean ( 4.9%) SHIPS Prob RI for 25kt/ 24hr RI threshold= 9% is 0.8 times climatological mean (10.9%) SHIPS Prob RI for 30kt/ 24hr RI threshold= 8% is 1.1 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: 1.5% 9.1% 7.5% 0.0% 0.0% 0.0% 0.0% 0.0% Logistic: 1.4% 1.0% 0.7% 0.1% 0.0% 0.1% 0.0% 0.0% Bayesian: 0.9% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Consensus: 1.3% 3.4% 2.7% 0.0% 0.0% 0.0% 0.0% 0.0% DTOPS: 1.0% 2.0% 1.0% 0.0% 0.0% 0.0% 0.0% 0.0% SDCON: 1.1% 2.7% 1.8% 0.0% 0.0% 0.0% 0.0% 0.0% ## ANNULAR HURRICANE INDEX (AHI) AL082026 HANNA 09/28/26 18 UTC ## ## STORM NOT ANNULAR, SCREENING STEP FAILED, NPASS=4 NFAIL=3 ## ## 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 AL082026 HANNA 09/28/2026 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) 40 43 44 46 47 46 43 41 38 DIS DIS DIS DIS DIS DIS DIS DIS 18HR AGO 40 39 40 42 43 42 39 37 34 DIS DIS DIS DIS DIS DIS DIS DIS 12HR AGO 40 37 36 38 39 38 35 33 30 DIS DIS DIS DIS DIS DIS DIS DIS 6HR AGO 40 34 31 30 31 30 27 25 22 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