* GFS version * * ATLANTIC 2021 SHIPS INTENSITY FORECAST * * IR SAT DATA AVAILABLE, OHC AVAILABLE * * PETER AL162021 09/22/21 00 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 29 28 27 27 28 30 29 30 31 32 34 36 37 37 38 41 V (KT) LAND 30 29 28 27 27 28 30 29 30 31 32 34 36 37 37 38 41 V (KT) LGEM 30 28 26 25 24 22 20 19 19 20 21 N/A N/A N/A N/A N/A N/A Storm Type TROP TROP TROP TROP TROP TROP TROP TROP TROP TROP TROP N/A N/A N/A N/A N/A N/A SHEAR (KT) 27 31 31 35 33 25 19 17 17 19 21 N/A N/A N/A N/A N/A N/A SHEAR ADJ (KT) 1 0 -1 -2 0 4 0 3 0 -5 -2 N/A N/A N/A N/A N/A N/A SHEAR DIR 252 261 259 254 260 279 287 281 245 257 243 N/A N/A N/A N/A N/A N/A SST (C) 28.9 29.1 29.1 29.0 29.0 29.1 29.4 29.0 28.9 28.5 28.4 N/A N/A N/A N/A N/A N/A POT. INT. (KT) 150 153 152 150 149 151 157 151 149 141 139 N/A N/A N/A N/A N/A N/A ADJ. POT. INT. 138 139 136 132 130 132 137 132 128 118 114 N/A N/A N/A N/A N/A N/A 200 MB T (C) -54.0 -54.1 -54.3 -54.3 -54.3 -54.7 -54.7 -54.9 -54.9 -55.2 -55.1 N/A N/A N/A N/A N/A N/A 200 MB VXT (C) 0.2 0.0 0.0 0.2 0.2 0.1 -0.2 -0.3 -0.2 -0.1 -0.1 N/A N/A N/A N/A N/A N/A TH_E DEV (C) 10 10 9 10 10 9 9 8 7 7 7 N/A N/A N/A N/A N/A N/A 700-500 MB RH 52 54 55 54 55 56 55 57 58 55 54 N/A N/A N/A N/A N/A N/A MODEL VTX (KT) 9 7 7 7 7 6 5 4 3 2 2 LOST LOST LOST LOST LOST LOST 850 MB ENV VOR -1 0 -4 -11 -8 -7 8 10 29 23 20 N/A N/A N/A N/A N/A N/A 200 MB DIV -1 10 1 26 7 8 17 -23 12 -8 -11 N/A N/A N/A N/A N/A N/A 700-850 TADV -1 -3 0 3 1 0 2 3 -1 0 0 N/A N/A N/A N/A N/A N/A LAND (KM) 301 361 398 423 445 543 684 845 1038 1168 1230 N/A N/A N/A N/A N/A N/A LAT (DEG N) 21.2 21.8 22.3 22.8 23.2 24.1 25.2 26.4 27.9 28.9 29.4 N/A N/A N/A N/A N/A N/A LONG(DEG W) 65.8 66.5 67.1 67.5 67.8 67.6 66.9 66.0 65.0 64.3 63.9 N/A N/A N/A N/A N/A N/A STM SPEED (KT) 9 8 7 6 5 5 7 8 7 5 3 N/A N/A N/A N/A N/A N/A HEAT CONTENT 74 86 87 74 62 47 47 38 32 30 27 N/A N/A N/A N/A N/A N/A FORECAST TRACK FROM OFCI INITIAL HEADING/SPEED (DEG/KT):310/ 10 CX,CY: -7/ 6 T-12 MAX WIND: 35 PRESSURE OF STEERING LEVEL (MB): 695 (MEAN=620) GOES IR BRIGHTNESS TEMP. STD DEV. 50-200 KM RAD: 27.2 (MEAN=14.5) % GOES IR PIXELS WITH T < -20 C 50-200 KM RAD: 29.0 (MEAN=65.0) PRELIM RI PROB (DV .GE. 35 KT IN 36 HR): 0.2 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. 10. 11. 12. 12. 13. 14. 15. 15. 16. SST POTENTIAL 0. 1. 1. 2. 4. 8. 14. 19. 22. 25. 27. 30. 32. 32. 32. 31. VERTICAL SHEAR MAG 1. 1. 2. 2. 1. -1. -5. -8. -11. -14. -16. -18. -21. -23. -24. -24. VERTICAL SHEAR ADJ 0. 0. 0. 1. 0. 0. 0. 0. 1. 1. 1. 1. 1. 1. 1. 1. VERTICAL SHEAR DIR -0. -0. -0. -1. -1. -1. -1. -1. -1. -0. -0. -0. -0. -0. -0. -1. PERSISTENCE -1. -2. -2. -2. -1. -1. -1. -1. -0. -0. 0. 0. -0. -1. -2. -2. 200/250 MB TEMP. -0. -0. -0. -0. 0. 0. 0. 1. 1. 1. 2. 2. 3. 4. 5. 7. 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. -0. -0. -0. -1. -1. -1. -1. -1. -1. -2. -2. -2. MODEL VTX TENDENCY -0. -1. -2. -2. -4. -6. -9. -11. -14. -15. -16. -17. -17. -16. -16. -16. 850 MB ENV VORTICITY -0. -0. -0. -0. -1. -1. -1. -1. -1. -1. -1. -1. -2. -2. -2. -2. 200 MB DIVERGENCE -0. -0. -0. -1. -1. -1. -2. -2. -2. -1. -0. 0. 1. 1. 2. 2. 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. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. STEERING LEVEL PRES -0. -0. -0. -0. -1. -1. -0. -1. -1. -1. -2. -2. -1. -1. -1. -1. 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. -2. -3. -3. -3. -3. -3. -4. -4. -4. -4. -3. OCEAN HEAT CONTENT -0. -0. -1. -1. -0. -0. -0. -0. -0. -0. -0. -0. -0. -0. -0. -0. RI POTENTIAL -0. -1. -2. -3. -4. -4. -3. -1. -0. 1. 2. 3. 3. 3. 4. 4. ------------------------------------------------------------------------------ TOTAL CHANGE -1. -2. -3. -3. -2. -0. -1. -0. 1. 2. 4. 6. 7. 7. 8. 11. CURRENT MAX WIND (KT): 30. LAT, LON: 21.2 65.8 ** 2021 ATLANTIC RI INDEX AL162021 PETER 09/22/21 00 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 0.54 999.0 850-200 MB SHEAR (KT) : 31.6 30.1 to 2.3 0.00 0.0 HEAT CONTENT (KJ/CM2) : 76.6 0.0 to 151.8 0.50 999.0 STD DEV OF IR BR TEMP : 27.2 36.6 to 2.8 0.28 999.0 MAXIMUM WIND (KT) : 30.0 22.5 to 137.5 0.20 999.0 BL DRY-AIR FLUX (W/M2) : 178.8 895.4 to -55.0 0.75 999.0 2nd PC OF IR BR TEMP : 2.3 2.9 to -2.9 0.09 999.0 POT = MPI-VMAX (KT) : 104.9 28.3 to 146.3 0.65 999.0 D200 (10**7s-1) : 8.6 -29.7 to 185.9 0.18 999.0 %area of TPW <45 mm upshear : 16.0 100.0 to 0.0 0.84 999.0 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= 3% is 0.3 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: 1.7% 3.3% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Logistic: 0.4% 0.5% 0.2% 0.1% 0.0% 0.4% 0.9% 1.1% Bayesian: 0.1% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% Consensus: 0.7% 1.3% 0.1% 0.0% 0.0% 0.1% 0.3% 0.4% DTOPS: 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% ## ANNULAR HURRICANE INDEX (AHI) AL162021 PETER 09/22/21 00 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 AL162021 PETER 09/22/2021 00 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 28 27 27 28 30 29 30 31 32 34 36 37 37 38 41 18HR AGO 30 29 28 27 27 28 30 29 30 31 32 34 36 37 37 38 41 12HR AGO 30 27 26 25 25 26 28 27 28 29 30 32 34 35 35 36 39 6HR AGO 30 24 21 20 20 21 23 22 23 24 25 27 29 30 30 31 34 NOW CURRENT INTENSITY < 83 KT IN 6HR INTENSITY IN 6HR < 83 KT IN 12HR INTENSITY IN 12HR < 83 KT