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Tropical Depression Ten Forecast Discussion Number 4
2021-08-29 04:35:53| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Sat Aug 28 2021 941 WTNT45 KNHC 290235 TCDAT5 Tropical Depression Ten Discussion Number 4 NWS National Hurricane Center Miami FL AL102021 1100 PM AST Sat Aug 28 2021 The center of the tropical depression remained exposed for much of the evening, though in the past hour or so the center has become located closer to a small, ragged area of convection. A more pronounced curved band can also be seen east of the depression though this feature is located over 120 n mi away. This structure is due to ongoing west-southwesterly shear and the presence of some dry air that continues to plague the cyclone. The latest Dvorak intensity estimate from TAFB and wind data from a recent ASCAT-B overpass indicate the initial intensity remains 30 kt. Some slight strengthening is possible later tonight through Sunday morning as a slight decrease in shear combined with the diurnal convective maximum may allow the depression to become a tropical storm. Thereafter through 60 h, the shear is forecast to increase, while the system moves into an drier environment. Thus, no further strengthening is forecast during this period, and the cyclone could weaken back into a tropical depression. By around 72 h, global models are suggesting that the shear will decrease again. So, some gradual strengthening is forecast after that time. It should also be noted that the GFS, which earlier forecast the system to degenerate into a remnant low in a few days, now keeps the cyclone in tact and deepens it when the shear lessens toward the end of the 5-day forecast period. The latest NHC intensity forecast is close to the previous one through 24 h, but is higher beyond 24 h. This forecast is a blend of the SHIPS and IVCN guidance through 72 h, but is lower than those solutions after that time. The depression is moving toward the north at 9 kt toward a weakness in the subtropical ridge, carved out by a mid- to upper-level trough over the north-central Atlantic. This trough and associated ridge weakness is forecast to remain in place for the next few days, resulting in the cyclone continuing a general northward motion. By late in the forecast period, the trough is expected to lift out of the region and be replaced by a ridge, which would result in the system turning northwestward. The latest NHC track forecast is little changed from the previous one and lies near the various multi-model consensus tracks. FORECAST POSITIONS AND MAX WINDS INIT 29/0300Z 16.6N 49.9W 30 KT 35 MPH 12H 29/1200Z 17.7N 49.9W 35 KT 40 MPH 24H 30/0000Z 19.4N 49.9W 35 KT 40 MPH 36H 30/1200Z 20.8N 49.7W 35 KT 40 MPH 48H 31/0000Z 22.3N 49.2W 35 KT 40 MPH 60H 31/1200Z 23.5N 49.0W 35 KT 40 MPH 72H 01/0000Z 25.0N 49.2W 40 KT 45 MPH 96H 02/0000Z 28.2N 50.6W 40 KT 45 MPH 120H 03/0000Z 31.5N 51.7W 45 KT 50 MPH $$ Forecaster Latto
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Tropical Depression Ten Wind Speed Probabilities Number 4
2021-08-29 04:35:34| National Hurricane Center (Atlantic)
Issued at 0300 UTC SUN AUG 29 2021 000 FONT15 KNHC 290235 PWSAT5 TROPICAL DEPRESSION TEN WIND SPEED PROBABILITIES NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL102021 0300 UTC SUN AUG 29 2021 AT 0300Z THE CENTER OF TROPICAL DEPRESSION TEN WAS LOCATED NEAR LATITUDE 16.6 NORTH...LONGITUDE 49.9 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 30 KTS...35 MPH...55 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 00Z SUN AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 00Z SUN 12Z SUN 00Z MON 12Z MON 00Z TUE 00Z WED 00Z THU PERIODS TO TO TO TO TO TO TO 12Z SUN 00Z MON 12Z MON 00Z TUE 00Z WED 00Z THU 00Z FRI FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER LATTO
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Tropical Depression Ten Forecast Advisory Number 4
2021-08-29 04:35:28| National Hurricane Center (Atlantic)
Issued at 0300 UTC SUN AUG 29 2021 000 WTNT25 KNHC 290235 TCMAT5 TROPICAL DEPRESSION TEN FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL102021 0300 UTC SUN AUG 29 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 16.6N 49.9W AT 29/0300Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE NORTH OR 360 DEGREES AT 9 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1007 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 16.6N 49.9W AT 29/0300Z AT 29/0000Z CENTER WAS LOCATED NEAR 16.2N 49.9W FORECAST VALID 29/1200Z 17.7N 49.9W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 30NE 30SE 0SW 0NW. FORECAST VALID 30/0000Z 19.4N 49.9W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 30NE 30SE 0SW 0NW. FORECAST VALID 30/1200Z 20.8N 49.7W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 40NE 40SE 0SW 0NW. FORECAST VALID 31/0000Z 22.3N 49.2W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 40NE 40SE 0SW 0NW. FORECAST VALID 31/1200Z 23.5N 49.0W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 40NE 40SE 0SW 0NW. FORECAST VALID 01/0000Z 25.0N 49.2W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 40NE 40SE 0SW 0NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 02/0000Z 28.2N 50.6W MAX WIND 40 KT...GUSTS 50 KT. OUTLOOK VALID 03/0000Z 31.5N 51.7W MAX WIND 45 KT...GUSTS 55 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 16.6N 49.9W NEXT ADVISORY AT 29/0900Z $$ FORECASTER LATTO
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Summary for Tropical Depression Ten (AT5/AL102021)
2021-08-29 04:35:24| National Hurricane Center (Atlantic)
...DEPRESSION EXPECTED TO BECOME A TROPICAL STORM ON SUNDAY... As of 11:00 PM AST Sat Aug 28 the center of Ten was located near 16.6, -49.9 with movement N at 10 mph. The minimum central pressure was 1007 mb with maximum sustained winds of about 35 mph.
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Tropical Depression Ten Public Advisory Number 4
2021-08-29 04:35:24| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Sat Aug 28 2021 581 WTNT35 KNHC 290235 TCPAT5 BULLETIN Tropical Depression Ten Advisory Number 4 NWS National Hurricane Center Miami FL AL102021 1100 PM AST Sat Aug 28 2021 ...DEPRESSION EXPECTED TO BECOME A TROPICAL STORM ON SUNDAY... SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...16.6N 49.9W ABOUT 785 MI...1265 KM E OF THE LEEWARD ISLANDS MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...N OR 360 DEGREES AT 10 MPH...17 KM/H MINIMUM CENTRAL PRESSURE...1007 MB...29.74 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 1100 PM AST (0300 UTC), the center of Tropical Depression Ten was located near latitude 16.6 North, longitude 49.9 West. The depression is moving toward the north near 10 mph (17 km/h) and this general motion is expected to continue for the next few days. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Some slight strengthening is expected later tonight, and the depression is forecast to become a tropical storm on Sunday. Little change in strength is expected thereafter through early next week. The estimated minimum central pressure is 1007 mb (29.74 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 500 AM AST. $$ Forecaster Latto
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