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Subtropical Storm Ernesto Forecast Discussion Number 4
2018-08-16 04:34:08| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Wed Aug 15 2018 844 WTNT45 KNHC 160234 TCDAT5 Subtropical Storm Ernesto Discussion Number 4 NWS National Hurricane Center Miami FL AL052018 1100 PM AST Wed Aug 15 2018 Although inner-core convection has increased since the previous advisory, outer banding features have become more fragmented and the overall cloud pattern has become elongated north-to-south. There are also no signs of any upper-level anticyclonic outflow, an indication that Ernesto is still a subtropical cyclone. The initial intensity is being maintained at 35 kt based on a 2328Z ASCAT pass that showed peak winds of 32 kt in the southeastern quadrant, along with a radius of maximum winds of 70-80 nmi. This intensity is consistent with a ST2.5/35 kt classification from TAFB. The initial motion is now north-northeastward or 025/09 kt. Ernesto has rounded the subtropical ridge axis to its south, and the cyclone should gradually get caught up in the mid-latitude westerlies and turn northeastward during the next 12 hours or so. A northeastward motion along with a steadily increasing forward speed is expected through Friday. The track guidance is tightly packed around the previous advisory track, so the new NHC forecast track is essentially just an extension of the previous advisory, and lies near the track consensus models HCCA and TVCN. On the forecast track, Ernesto is expected to approach Ireland as an extratropical gale area on Saturday. Ernesto is expected to remain over sea-surface temperatures (SST) of 25 deg C or warmer for the next 18-24 hours, along with low vertical shear conditions of less than 10 kt. These conditions should allow for some slight strengthening during that short time window. By 36 hours, Ernesto is forecast to be moving over SSTs of 20 deg C and colder and into a more stable airmass, resulting in a degeneration of the inner-core convection. As a result, Ernesto is expected to become a post-tropical cyclone by 36 hours, and become an extratropical gale area after merging with a frontal zone near Ireland and the United Kingdom in about 3 days. FORECAST POSITIONS AND MAX WINDS INIT 16/0300Z 39.7N 45.1W 35 KT 40 MPH 12H 16/1200Z 41.3N 43.4W 40 KT 45 MPH 24H 17/0000Z 43.7N 40.0W 40 KT 45 MPH 36H 17/1200Z 46.3N 34.9W 40 KT 45 MPH...POST-TROPICAL 48H 18/0000Z 49.0N 27.9W 40 KT 45 MPH...POST-TROP/EXTRATROP 72H 19/0000Z 54.0N 12.1W 40 KT 45 MPH...POST-TROP/EXTRATROP 96H 20/0000Z...DISSIPATED $$ Forecaster Stewart
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Subtropical Storm Ernesto Forecast Advisory Number 4
2018-08-16 04:33:43| National Hurricane Center (Atlantic)
Issued at 0300 UTC THU AUG 16 2018 232 WTNT25 KNHC 160233 TCMAT5 SUBTROPICAL STORM ERNESTO FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL052018 0300 UTC THU AUG 16 2018 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. SUBTROPICAL STORM CENTER LOCATED NEAR 39.7N 45.1W AT 16/0300Z POSITION ACCURATE WITHIN 20 NM PRESENT MOVEMENT TOWARD THE NORTH-NORTHEAST OR 25 DEGREES AT 9 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1008 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT.......120NE 140SE 0SW 0NW. 12 FT SEAS..120NE 160SE 0SW 0NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 39.7N 45.1W AT 16/0300Z AT 16/0000Z CENTER WAS LOCATED NEAR 39.3N 45.4W FORECAST VALID 16/1200Z 41.3N 43.4W MAX WIND 40 KT...GUSTS 50 KT. 34 KT...120NE 140SE 0SW 0NW. FORECAST VALID 17/0000Z 43.7N 40.0W MAX WIND 40 KT...GUSTS 50 KT. 34 KT...120NE 140SE 0SW 0NW. FORECAST VALID 17/1200Z 46.3N 34.9W...POST-TROPICAL MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 90NE 140SE 80SW 0NW. FORECAST VALID 18/0000Z 49.0N 27.9W...POST-TROP/EXTRATROP MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 70NE 150SE 120SW 0NW. FORECAST VALID 19/0000Z 54.0N 12.1W...POST-TROP/EXTRATROP MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 0NE 150SE 120SW 0NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 20/0000Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 39.7N 45.1W NEXT ADVISORY AT 16/0900Z $$ FORECASTER STEWART
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Subtropical Storm Ernesto Wind Speed Probabilities Number 4
2018-08-16 04:33:42| National Hurricane Center (Atlantic)
Issued at 0300 UTC THU AUG 16 2018 204 FONT15 KNHC 160233 PWSAT5 SUBTROPICAL STORM ERNESTO WIND SPEED PROBABILITIES NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL052018 0300 UTC THU AUG 16 2018 AT 0300Z THE CENTER OF SUBTROPICAL STORM ERNESTO WAS LOCATED NEAR LATITUDE 39.7 NORTH...LONGITUDE 45.1 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 00Z THU 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 THU 12Z THU 00Z FRI 12Z FRI 00Z SAT 00Z SUN 00Z MON PERIODS TO TO TO TO TO TO TO 12Z THU 00Z FRI 12Z FRI 00Z SAT 00Z SUN 00Z MON 00Z TUE FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT $$ FORECASTER STEWART
Summary for Subtropical Storm Ernesto (AT5/AL052018)
2018-08-16 04:33:05| National Hurricane Center (Atlantic)
...ERNESTO MOVING NORTH-NORTHEASTWARD OVER THE NORTH-CENTRAL ATLANTIC... As of 11:00 PM AST Wed Aug 15 the center of Ernesto was located near 39.7, -45.1 with movement NNE at 10 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 40 mph.
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Subtropical Storm Ernesto Public Advisory Number 4
2018-08-16 04:33:05| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Wed Aug 15 2018 ZCZC MIATCPAT5 ALL TTAA00 KNHC DDHHMM BULLETIN Subtropical Storm Ernesto Advisory Number 4 NWS National Hurricane Center Miami FL AL052018 1100 PM AST Wed Aug 15 2018 ...ERNESTO MOVING NORTH-NORTHEASTWARD OVER THE NORTH-CENTRAL ATLANTIC... SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...39.7N 45.1W ABOUT 630 MI...1010 KM SE OF CAPE RACE NEWFOUNDLAND MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...NNE OR 25 DEGREES AT 10 MPH...17 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 1100 PM AST (0300 UTC), the center of Subtropical Storm Ernesto was located near latitude 39.7 North, longitude 45.1 West. The storm is moving toward the north-northeast near 10 mph (17 km/h). A turn toward the northeast with an increase in forward speed is forecast tonight and early Thursday, with that motion continuing through Saturday. Maximum sustained winds remain near 40 mph (65 km/h) with higher gusts. Little change in strength is forecast during the next 24 hours. Ernesto is expected to become a post-tropical cyclone Thursday night or early Friday, and merge with a frontal zone near Ireland and the United Kingdom on Saturday. Winds of 40 mph extend outward up to 160 miles (260 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 500 AM AST. $$ Forecaster Stewart NNNN
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