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Tropical Depression FIONA Forecast Discussion Number 25

2016-08-23 04:34:21| National Hurricane Center (Atlantic)

Issued at 1100 PM AST MON AUG 22 2016 000 WTNT41 KNHC 230234 TCDAT1 TROPICAL DEPRESSION FIONA DISCUSSION NUMBER 25 NWS NATIONAL HURRICANE CENTER MIAMI FL AL062016 1100 PM AST MON AUG 22 2016 Fiona is a very disorganized tropical cyclone. The associated deep convection has been sputtering and lacking in organization. The current intensity is held at 30 kt in accordance with a Dvorak estimate from TAFB. Strong westerly shear has been affecting the tropical cyclone, but this shear is forecast to abate in 12 to 24 hours as the system moves away from an upper-level trough and into a region of upper-level easterlies. By 48 hours or so, however, the shear over the cyclone should be increasing due to another trough just off the U.S. east coast. Given its current state, Fiona is not expected to take much advantage from the reduced shear and instead will likely degenerate into a remnant low in 48 hours, or sooner. The official intensity forecast is below the consensus guidance, and follows the trend shown in the global models. The center is not easy to locate on night time imagery, but the best guess at the initial motion is a slightly slower 290/13 kt. Fiona is expected to turn northwestward with some deceleration as it heads for a break in the subtropical ridge. The official track forecast is very close to the latest dynamical model consensus, TVCN. FORECAST POSITIONS AND MAX WINDS INIT 23/0300Z 25.5N 62.3W 30 KT 35 MPH 12H 23/1200Z 25.9N 63.8W 30 KT 35 MPH 24H 24/0000Z 26.7N 65.8W 25 KT 30 MPH 36H 24/1200Z 27.7N 67.6W 25 KT 30 MPH 48H 25/0000Z 28.7N 68.9W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 26/0000Z 30.0N 70.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 27/0000Z 30.5N 71.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 28/0000Z...DISSIPATED $$ Forecaster Pasch

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Tropical Depression FIONA Wind Speed Probabilities Number 25

2016-08-23 04:33:49| National Hurricane Center (Atlantic)

Issued at 0300 UTC TUE AUG 23 2016 000 FONT11 KNHC 230233 PWSAT1 TROPICAL DEPRESSION FIONA WIND SPEED PROBABILITIES NUMBER 25 NWS NATIONAL HURRICANE CENTER MIAMI FL AL062016 0300 UTC TUE AUG 23 2016 AT 0300Z THE CENTER OF TROPICAL DEPRESSION FIONA WAS LOCATED NEAR LATITUDE 25.5 NORTH...LONGITUDE 62.3 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 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 64 KT ARE SHOWN WHEN THE 5-DAY 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 $$ FORECASTER PASCH

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Summary for Tropical Depression FIONA (AT1/AL062016)

2016-08-23 04:33:29| National Hurricane Center (Atlantic)

...FIONA REMAINS A DISORGANIZED TROPICAL DEPRESSION... As of 11:00 PM AST Mon Aug 22 the center of FIONA was located near 25.5, -62.3 with movement WNW at 15 mph. The minimum central pressure was 1010 mb with maximum sustained winds of about 35 mph.

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Tropical Depression FIONA Public Advisory Number 25

2016-08-23 04:33:29| National Hurricane Center (Atlantic)

Issued at 1100 PM AST MON AUG 22 2016 000 WTNT31 KNHC 230233 TCPAT1 BULLETIN TROPICAL DEPRESSION FIONA ADVISORY NUMBER 25 NWS NATIONAL HURRICANE CENTER MIAMI FL AL062016 1100 PM AST MON AUG 22 2016 ...FIONA REMAINS A DISORGANIZED TROPICAL DEPRESSION... SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...25.5N 62.3W ABOUT 505 MI...815 KM N OF THE NORTHERN LEEWARD ISLANDS ABOUT 495 MI...795 KM SSE OF BERMUDA MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 15 MPH...24 KM/H MINIMUM CENTRAL PRESSURE...1010 MB...29.83 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ At 1100 PM AST (0300 UTC), the center of Tropical Depression Fiona was located near latitude 25.5 North, longitude 62.3 West. The depression is moving toward the west-northwest near 15 mph (24 km/h) and a gradual turn toward the northwest with a decrease in forward speed is expected over the next 48 hours. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Fiona is expected to become a remnant low within the next couple of days. The estimated minimum central pressure is 1010 mb (29.83 inches). HAZARDS AFFECTING LAND ---------------------- None. NEXT ADVISORY ------------- Next complete advisory at 500 AM AST. $$ Forecaster Pasch

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Tropical Depression FIONA Forecast Advisory Number 25

2016-08-23 04:33:23| National Hurricane Center (Atlantic)

Issued at 0300 UTC TUE AUG 23 2016 000 WTNT21 KNHC 230233 TCMAT1 TROPICAL DEPRESSION FIONA FORECAST/ADVISORY NUMBER 25 NWS NATIONAL HURRICANE CENTER MIAMI FL AL062016 0300 UTC TUE AUG 23 2016 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 25.5N 62.3W AT 23/0300Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 290 DEGREES AT 13 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1010 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. 12 FT SEAS.. 60NE 0SE 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 25.5N 62.3W AT 23/0300Z AT 23/0000Z CENTER WAS LOCATED NEAR 25.3N 61.6W FORECAST VALID 23/1200Z 25.9N 63.8W MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 24/0000Z 26.7N 65.8W MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 24/1200Z 27.7N 67.6W MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 25/0000Z 28.7N 68.9W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 26/0000Z 30.0N 70.0W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 200 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 27/0000Z 30.5N 71.0W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. OUTLOOK VALID 28/0000Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 25.5N 62.3W NEXT ADVISORY AT 23/0900Z $$ FORECASTER PASCH

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