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Tropical Storm Vicky Forecast Discussion Number 11
2020-09-16 22:45:06| National Hurricane Center (Atlantic)
Issued at 500 PM AST Wed Sep 16 2020 000 WTNT41 KNHC 162044 TCDAT1 Tropical Storm Vicky Discussion Number 11 NWS National Hurricane Center Miami FL AL212020 500 PM AST Wed Sep 16 2020 There's been little change in Vicky's cloud pattern this afternoon. What's left of the deep convection associated with Vicky is displaced well to the east of the center. Cirrus clouds produced by the outflow of Hurricane Teddy, located nearly 1000 miles to the west-southwest of Vicky, are obscuring the sheared surface circulation. The initial intensity is held at 35 kt for this advisory in deference to the earlier scatterometer pass and due to the fact that the cloud pattern has remained unchanged. The UW-CIMSS SAT-Wind/shear products and water vapor imagery reveal an interesting upper wind pattern consisting of an upper low just to the west of Vicky and a narrow upper-tropospheric ridge to the south of the cyclone. These upper-level features are temporarily creating a very diffluent pattern which appears to be offsetting the blistering westerly shear a bit. In any event, Vicky is still forecast to gradually lose strength and degenerate to a remnant low on Friday, which is in best agreement with the global models and the statistical-dynamical intensity aids. The initial motion estimate is more westward, or 270/08. Vicky should continue moving westward for the next day or two before turning west-southwestward in the low-level tradewind flow. The new NHC track forecast is south of the previous one and is close to the HCCA and TCVA multi-model consensus guidance. FORECAST POSITIONS AND MAX WINDS INIT 16/2100Z 21.5N 35.7W 35 KT 40 MPH 12H 17/0600Z 21.6N 37.0W 35 KT 40 MPH 24H 17/1800Z 21.3N 38.9W 30 KT 35 MPH 36H 18/0600Z 20.6N 40.7W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 18/1800Z 19.8N 42.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 19/0600Z...DISSIPATED $$ Forecaster Roberts
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Tropical Storm Vicky Wind Speed Probabilities Number 11
2020-09-16 22:44:38| National Hurricane Center (Atlantic)
Issued at 2100 UTC WED SEP 16 2020 000 FONT11 KNHC 162044 PWSAT1 TROPICAL STORM VICKY WIND SPEED PROBABILITIES NUMBER 11 NWS NATIONAL HURRICANE CENTER MIAMI FL AL212020 2100 UTC WED SEP 16 2020 AT 2100Z THE CENTER OF TROPICAL STORM VICKY WAS LOCATED NEAR LATITUDE 21.5 NORTH...LONGITUDE 35.7 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 35 KTS...40 MPH...65 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 18Z WED AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 18Z WED 06Z THU 18Z THU 06Z FRI 18Z FRI 18Z SAT 18Z SUN PERIODS TO TO TO TO TO TO TO 06Z THU 18Z THU 06Z FRI 18Z FRI 18Z SAT 18Z SUN 18Z MON FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER ROBERTS
Summary for Tropical Storm Vicky (AT1/AL212020)
2020-09-16 22:44:08| National Hurricane Center (Atlantic)
...VICKY HEADING WEST OVER THE OPEN EASTERN TROPICAL ATLANTIC... As of 5:00 PM AST Wed Sep 16 the center of Vicky was located near 21.5, -35.7 with movement W at 9 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 40 mph.
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Tropical Storm Vicky Public Advisory Number 11
2020-09-16 22:44:08| National Hurricane Center (Atlantic)
Issued at 500 PM AST Wed Sep 16 2020 000 WTNT31 KNHC 162043 TCPAT1 BULLETIN Tropical Storm Vicky Advisory Number 11 NWS National Hurricane Center Miami FL AL212020 500 PM AST Wed Sep 16 2020 ...VICKY HEADING WEST OVER THE OPEN EASTERN TROPICAL ATLANTIC... SUMMARY OF 500 PM AST...2100 UTC...INFORMATION ---------------------------------------------- LOCATION...21.5N 35.7W ABOUT 855 MI...1375 KM WNW OF THE CABO VERDE ISLANDS MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...W OR 270 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 500 PM AST (2100 UTC), the center of Tropical Storm Vicky was located near latitude 21.5 North, longitude 35.7 West. Vicky is moving toward the west near 9 mph (15 km/h) , and a westward motion is expected to continue through late Thursday. A west-southwestward motion is forecast to begin by Friday and continue through dissipation. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Additional weakening is forecast, and Vicky is expected to become a tropical depression Thursday, weaken to a remnant low on Friday, and dissipate Saturday. Tropical-storm-force winds extend outward up to 80 miles (130 km) from the center. The estimated minimum central pressure is 1008 mb (29.77 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 1100 PM AST. $$ Forecaster Roberts
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Tropical Storm Vicky Forecast Advisory Number 11
2020-09-16 22:44:08| National Hurricane Center (Atlantic)
Issued at 2100 UTC WED SEP 16 2020 000 WTNT21 KNHC 162043 TCMAT1 TROPICAL STORM VICKY FORECAST/ADVISORY NUMBER 11 NWS NATIONAL HURRICANE CENTER MIAMI FL AL212020 2100 UTC WED SEP 16 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 21.5N 35.7W AT 16/2100Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1008 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 60NE 30SE 20SW 70NW. 12 FT SEAS..120NE 30SE 75SW 120NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 21.5N 35.7W AT 16/2100Z AT 16/1800Z CENTER WAS LOCATED NEAR 21.4N 35.3W FORECAST VALID 17/0600Z 21.6N 37.0W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 50NE 0SE 0SW 40NW. FORECAST VALID 17/1800Z 21.3N 38.9W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 18/0600Z 20.6N 40.7W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 18/1800Z 19.8N 42.3W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 19/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 21.5N 35.7W NEXT ADVISORY AT 17/0300Z $$ FORECASTER ROBERTS
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