* GFS version * * ATLANTIC 2024 SHIPS INTENSITY FORECAST * * IR SAT DATA AVAILABLE, OHC AVAILABLE * * HELENE AL092024 09/27/24 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 30 21 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A V (KT) LAND 30 29 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A V (KT) LGEM 30 29 28 28 28 28 28 28 N/A N/A N/A N/A N/A N/A N/A N/A N/A Storm Type EXTP EXTP EXTP EXTP EXTP EXTP EXTP EXTP N/A N/A N/A N/A N/A N/A N/A N/A N/A SHEAR (KT) 35 31 20 13 15 26 35 35 N/A N/A N/A N/A N/A N/A N/A N/A N/A SHEAR ADJ (KT) 4 -3 0 3 4 0 -6 0 N/A N/A N/A N/A N/A N/A N/A N/A N/A SHEAR DIR 210 198 217 232 238 248 237 247 N/A N/A N/A N/A N/A N/A N/A N/A N/A SST (C) 25.5 21.3 21.0 20.9 20.9 21.0 21.0 21.2 N/A N/A N/A N/A N/A N/A N/A N/A N/A POT. INT. (KT) 110 83 80 77 76 77 78 79 N/A N/A N/A N/A N/A N/A N/A N/A N/A 200 MB T (C) -47.7 -47.8 -48.2 -48.7 -49.0 -49.9 -50.5 -50.6 N/A N/A N/A N/A N/A N/A N/A N/A N/A 200 MB VXT (C) 1.6 0.8 0.8 0.4 1.0 0.7 -0.3 0.0 N/A N/A N/A N/A N/A N/A N/A N/A N/A TH_E DEV (C) 1 0 0 0 1 0 2 0 N/A N/A N/A N/A N/A N/A N/A N/A N/A 700-500 MB RH 54 48 45 47 49 51 50 46 N/A N/A N/A N/A N/A N/A N/A N/A N/A MODEL VTX (KT) 35 36 29 26 21 17 12 10 LOST LOST LOST LOST LOST LOST LOST LOST LOST 850 MB ENV VOR 158 175 163 161 145 115 88 22 N/A N/A N/A N/A N/A N/A N/A N/A N/A 200 MB DIV 119 80 39 7 43 10 4 -5 N/A N/A N/A N/A N/A N/A N/A N/A N/A 700-850 TADV 85 5 -8 2 3 0 -1 0 N/A N/A N/A N/A N/A N/A N/A N/A N/A LAND (KM) -592 -692 -792 -790 -781 -792 -766 -764 N/A N/A N/A N/A N/A N/A N/A N/A N/A LAT (DEG N) 36.7 37.3 37.9 37.8 37.7 37.9 37.8 38.1 N/A N/A N/A N/A N/A N/A N/A N/A N/A LONG(DEG W) 84.9 85.8 86.6 86.7 86.8 86.6 86.3 85.8 N/A N/A N/A N/A N/A N/A N/A N/A N/A STM SPEED (KT) 13 9 4 1 0 1 2 2 N/A N/A N/A N/A N/A N/A N/A N/A N/A HEAT CONTENT 5 5 5 5 5 5 5 5 N/A 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):330/ 17 CX,CY: -7/ 15 T-12 MAX WIND: 80 PRESSURE OF STEERING LEVEL (MB): 684 (MEAN=620) GOES IR BRIGHTNESS TEMP. STD DEV. 50-200 KM RAD: 13.3 (MEAN=14.5) % GOES IR PIXELS WITH T < -20 C 50-200 KM RAD: 14.0 (MEAN=65.0) PRELIM RI PROB (DV .GE. 35 KT IN 36 HR): 0.0 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. 4. 6. 8. 9. 0. 0. 0. 0. 0. 0. 0. 0. 0. SST POTENTIAL -1. -2. -3. -4. -4. -3. -2. 0. 0. 0. 0. 0. 0. 0. 0. 0. VERTICAL SHEAR MAG 2. 4. 6. 7. 9. 8. 5. 0. 0. 0. 0. 0. 0. 0. 0. 0. VERTICAL SHEAR ADJ 0. 0. 0. -0. 0. 1. 2. 0. 0. 0. 0. 0. 0. 0. 0. 0. VERTICAL SHEAR DIR 0. 0. 1. 1. 3. 4. 5. 0. 0. 0. 0. 0. 0. 0. 0. 0. PERSISTENCE -10. -15. -18. -17. -12. -9. -7. 0. 0. 0. 0. 0. 0. 0. 0. 0. 200/250 MB TEMP. -1. -2. -3. -4. -5. -5. -5. 0. 0. 0. 0. 0. 0. 0. 0. 0. THETA_E EXCESS -0. -1. -2. -3. -4. -5. -6. 0. 0. 0. 0. 0. 0. 0. 0. 0. 700-500 MB RH 0. 0. 0. 0. 1. 1. 1. 0. 0. 0. 0. 0. 0. 0. 0. 0. MODEL VTX TENDENCY 0. -3. -6. -11. -16. -27. -34. 0. 0. 0. 0. 0. 0. 0. 0. 0. 850 MB ENV VORTICITY 1. 1. 2. 2. 3. 3. 3. 0. 0. 0. 0. 0. 0. 0. 0. 0. 200 MB DIVERGENCE 0. 1. 1. 1. 0. 0. -0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 850-700 T ADVEC -0. 0. 0. 0. 1. 1. 1. 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. -1. -1. -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. -4. 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. -3. 0. 0. 0. 0. 0. 0. 0. 0. 0. -------------------------------------------------------------------------------------------- TOTAL CHANGE -9. -17. -22. -26. -24. -30. -35. 0. 0. 0. 0. 0. 0. 0. 0. 0. CURRENT MAX WIND (KT): 30. LAT, LON: 36.7 84.9 ** 2024 ATLANTIC RI INDEX AL092024 HELENE 09/27/24 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) : -50.0 -49.5 to 33.0 0.00 0.0 MULTI-LAYER SHEAR (KT) : 32.7 46.9 to 6.8 0.35 999.0 HEAT CONTENT (KJ/CM2) : 5.0 0.0 to 155.1 0.03 999.0 STD DEV OF IR BR TEMP : 13.3 36.6 to 2.8 0.69 999.0 MAXIMUM WIND (KT) : 30.0 22.5 to 137.5 0.20 999.0 2nd PC OF IR BR TEMP : -0.3 2.9 to -3.0 0.54 999.0 BL DRY-AIR FLUX (W/M2) : 108.6 895.4 to -69.3 0.82 999.0 D200 (10**7s-1) : 57.6 -29.7 to 189.2 0.40 999.0 POT = MPI-VMAX (KT) : 44.3 27.0 to 143.0 0.15 999.0 %area of TPW <45 mm upshear : 47.6 109.2 to 0.0 0.56 999.0 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= 2% is 0.4 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% 1.7% 0.0% 0.0% Logistic: 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Bayesian: 1.7% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Consensus: 0.6% 0.0% 0.0% 0.0% 0.0% 0.6% 0.0% 0.0% DTOPS: 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% SDCON: .3% 0% 0% 0% 0% .3% 0% 0% ## ANNULAR HURRICANE INDEX (AHI) AL092024 HELENE 09/27/24 18 UTC ## ## STORM NOT ANNULAR, SCREENING STEP FAILED, NPASS=3 NFAIL=4 ## ## 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 AL092024 HELENE 09/27/2024 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) 30 29 DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS 18HR AGO 30 29 DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS DIS 12HR AGO 30 27 26 26 26 26 26 26 26 26 26 26 26 26 26 26 26 6HR AGO 30 24 21 20 20 20 20 20 20 20 20 20 20 20 20 20 20 NOW CURRENT INTENSITY < 83 KT IN 6HR INTENSITY IN 6HR < 83 KT IN 12HR INTENSITY IN 12HR < 83 KT