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Tropical Storm Vicky Forecast Discussion Number 8
2020-09-16 04:32:20| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Tue Sep 15 2020 269 WTNT41 KNHC 160232 TCDAT1 Tropical Storm Vicky Discussion Number 8 NWS National Hurricane Center Miami FL AL212020 1100 PM AST Tue Sep 15 2020 Vicky provided a surprise this evening, with scatterometer data showing a solid 45-kt in the northwestern quadrant of the storm. You would never guess it from the satellite images, which show a very sheared system that would at best support an 30-35 kt intensity, as indicated by the latest Dvorak estimates. The initial wind speed is set to 45 kt, higher than the last time but not really a true strengthening since conventional satellite data was a bit deceptive earlier. Despite Vicky holding its own, models are still showing the strong shear persisting, which should eventually cause weakening. The cyclone is likely to last longer than previously anticipated though with some upper-level divergence counteracting the effects of the shear, but Vicky is forecast gradually lose strength and decay in a remnant low in a couple of days, similar to the consensus guidance. The storm continues to more west-northwestward, a little to the left of previous, at 290/10. Vicky should gradually turn westward tomorrow and west-southwestward later this week as it becomes a shallower cyclone. The new forecast is quite similar to the previous one, leaning on the northern side of the well-clustered guidance envelope since Vicky is persisting as a deeper cyclone for the moment. The only small change is to add a 72-hour forecast point as the remnants could linger for a while longer. FORECAST POSITIONS AND MAX WINDS INIT 16/0300Z 21.6N 33.1W 45 KT 50 MPH 12H 16/1200Z 22.0N 34.5W 40 KT 45 MPH 24H 17/0000Z 22.3N 36.3W 35 KT 40 MPH 36H 17/1200Z 22.4N 38.0W 30 KT 35 MPH 48H 18/0000Z 22.3N 39.7W 30 KT 35 MPH...POST-TROP/REMNT LOW 60H 18/1200Z 22.0N 41.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 19/0000Z 21.5N 43.5W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 20/0000Z...DISSIPATED $$ Forecaster Blake
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Tropical Storm Vicky Graphics
2020-09-16 04:32:01| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Wed, 16 Sep 2020 02:32:01 GMT Wind Speed Probabilities last updated Wed, 16 Sep 2020 02:32:01 GMT
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Tropical Storm Vicky Wind Speed Probabilities Number 8
2020-09-16 04:31:24| National Hurricane Center (Atlantic)
Issued at 0300 UTC WED SEP 16 2020 000 FONT11 KNHC 160231 PWSAT1 TROPICAL STORM VICKY WIND SPEED PROBABILITIES NUMBER 8 NWS NATIONAL HURRICANE CENTER MIAMI FL AL212020 0300 UTC WED SEP 16 2020 AT 0300Z THE CENTER OF TROPICAL STORM VICKY WAS LOCATED NEAR LATITUDE 21.6 NORTH...LONGITUDE 33.1 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 45 KTS...50 MPH...85 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 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 00Z WED 12Z WED 00Z THU 12Z THU 00Z FRI 00Z SAT 00Z SUN PERIODS TO TO TO TO TO TO TO 12Z WED 00Z THU 12Z THU 00Z FRI 00Z SAT 00Z SUN 00Z MON FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER BLAKE
Summary for Tropical Storm Vicky (AT1/AL212020)
2020-09-16 04:30:47| National Hurricane Center (Atlantic)
...VICKY REFUSES TO WEAKEN DESPITE THE SHEAR... As of 11:00 PM AST Tue Sep 15 the center of Vicky was located near 21.6, -33.1 with movement WNW at 12 mph. The minimum central pressure was 1004 mb with maximum sustained winds of about 50 mph.
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Tropical Storm Vicky Public Advisory Number 8
2020-09-16 04:30:47| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Tue Sep 15 2020 000 WTNT31 KNHC 160230 TCPAT1 BULLETIN Tropical Storm Vicky Advisory Number 8 NWS National Hurricane Center Miami FL AL212020 1100 PM AST Tue Sep 15 2020 ...VICKY REFUSES TO WEAKEN DESPITE THE SHEAR... SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...21.6N 33.1W ABOUT 710 MI...1140 KM NW OF THE CABO VERDE ISLANDS MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 12 MPH...19 KM/H MINIMUM CENTRAL PRESSURE...1004 MB...29.65 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 Storm Vicky was located near latitude 21.6 North, longitude 33.1 West. Vicky is moving toward the west-northwest near 12 mph (19 km/h). This general motion is expected overnight, followed by a westward motion starting late Wednesday, and a west-southwestward motion by late Thursday. Satellite-derived winds indicate that xaximum sustained winds are near 50 mph (85 km/h) with higher gusts. Gradual weakening is still forecast over the next few days, and the system could become a remannt low on Thursday. Tropical-storm-force winds extend outward up to 80 miles (130 km) from the center. The estimated minimum central pressure is 1004 mb (29.65 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 500 AM AST. $$ Forecaster Blake
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