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Tropical Storm Bill Forecast Advisory Number 4

2021-06-15 11:19:03| National Hurricane Center (Atlantic)

Issued at 0900 UTC TUE JUN 15 2021 914 WTNT22 KNHC 150918 TCMAT2 TROPICAL STORM BILL FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL022021 0900 UTC TUE JUN 15 2021 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL STORM CENTER LOCATED NEAR 38.5N 67.2W AT 15/0900Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTHEAST OR 50 DEGREES AT 27 KT ESTIMATED MINIMUM CENTRAL PRESSURE 999 MB MAX SUSTAINED WINDS 45 KT WITH GUSTS TO 55 KT. 34 KT....... 0NE 80SE 0SW 0NW. 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 38.5N 67.2W AT 15/0900Z AT 15/0600Z CENTER WAS LOCATED NEAR 37.6N 68.5W FORECAST VALID 15/1800Z 41.0N 62.9W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 60NE 80SE 50SW 0NW. FORECAST VALID 16/0600Z 44.7N 57.6W...POST-TROP/EXTRATROP MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 60NE 90SE 60SW 0NW. FORECAST VALID 16/1800Z 48.6N 52.6W...POST-TROP/EXTRATROP MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 60NE 90SE 60SW 0NW. FORECAST VALID 17/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 38.5N 67.2W NEXT ADVISORY AT 15/1500Z $$ FORECASTER STEWART

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Summary for Tropical Storm Bill (AT2/AL022021)

2021-06-15 11:01:07| National Hurricane Center (Atlantic)

...BILL STRENGTHENS A LITTLE MORE... ...EXPECTED TO BE A SHORT-LIVED TROPICAL STORM... As of 5:00 AM AST Tue Jun 15 the center of Bill was located near 38.5, -67.2 with movement NE at 31 mph. The minimum central pressure was 999 mb with maximum sustained winds of about 50 mph.

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Tropical Storm Bill Graphics

2021-06-15 04:39:10| National Hurricane Center (Atlantic)

5-Day Uncertainty Track last updated Tue, 15 Jun 2021 02:39:10 GMT Wind Speed Probabilities last updated Tue, 15 Jun 2021 03:22:37 GMT

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Tropical Storm Bill Forecast Discussion Number 3

2021-06-15 04:38:38| National Hurricane Center (Atlantic)

Issued at 1100 PM AST Mon Jun 14 2021 000 WTNT42 KNHC 150238 TCDAT2 Tropical Storm Bill Discussion Number 3 NWS National Hurricane Center Miami FL AL022021 1100 PM AST Mon Jun 14 2021 Deep convection has increased in a cluster to the northeast of the estimated center. Scatterometer measurements showed a couple of 40-41 kt vectors over the southeastern quadrant of the cyclone. On this basis, the estimated intensity is increased to 40 kt, which makes this the second tropical storm of the season, albeit a rather high-latitude one. The system is in an environment of fairly strong southwesterly shear, but the diffluent upper-level flow has apparently contributed to some strengthening in a seemingly hostile environment. Some additional short-term strengthening could occur but by 36 hours, the cyclone should merge with a baroclinic zone while approaching Newfoundland and become extratropical. This transition is also shown by the FSU cyclone phase analyses of the GFS model fields. Bill is moving fairly swiftly northeastward, or 055/20 kt. The track forecast appears to be straightforward. The flow ahead of a large mid-tropospheric trough near the United States east coast should accelerate the system northeastward for the next day or two, and until the system dissipates. The NHC track forecast is similar to the previous one and not far from the model consensus. FORECAST POSITIONS AND MAX WINDS INIT 15/0300Z 36.7N 69.8W 40 KT 45 MPH 12H 15/1200Z 38.9N 65.1W 45 KT 50 MPH 24H 16/0000Z 42.6N 59.6W 40 KT 45 MPH 36H 16/1200Z 46.5N 54.5W 35 KT 40 MPH...POST-TROP/EXTRATROP 48H 17/0000Z...DISSIPATED $$ Forecaster Pasch

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Tropical Storm Bill Wind Speed Probabilities Number 3

2021-06-15 04:38:11| National Hurricane Center (Atlantic)

Issued at 0300 UTC TUE JUN 15 2021 000 FONT12 KNHC 150238 PWSAT2 TROPICAL STORM BILL WIND SPEED PROBABILITIES NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL022021 0300 UTC TUE JUN 15 2021 AT 0300Z THE CENTER OF TROPICAL STORM BILL WAS LOCATED NEAR LATITUDE 36.7 NORTH...LONGITUDE 69.8 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 40 KTS...45 MPH...75 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 TUE 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 TUE 12Z TUE 00Z WED 12Z WED 00Z THU 00Z FRI 00Z SAT PERIODS TO TO TO TO TO TO TO 12Z TUE 00Z WED 12Z WED 00Z THU 00Z FRI 00Z SAT 00Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT CAPE RACE NFLD 34 X X( X) 20(20) X(20) X(20) X(20) X(20) ILE ST PIERRE 34 X X( X) 10(10) X(10) X(10) X(10) X(10) SABLE ISLAND 34 X 8( 8) 3(11) X(11) X(11) X(11) X(11) $$ FORECASTER PASCH

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