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Eta – Final advisory issued 11-13-2020 – 2020 Hurricane Season

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Eta – Final advisory issued 11-13-2020 – 2020 Hurricane Season

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ATTENTION: The NHC has issued it's last advisory on Eta as of 11-13-2020. All Graphics and Information on this page will eventually cease to update.
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NHC Public Advisory on Eta
  • Thu, 07 Aug 2025 14:48:21 +0000: Atlantic Post-Tropical Cyclone Dexter Advisory Number 15 - Atlantic Post-Tropical Cyclone Dexter Advisory Number 15
    530
    WTNT34 KNHC 071448
    TCPAT4

    BULLETIN
    Post-Tropical Cyclone Dexter Advisory Number 15
    NWS National Hurricane Center Miami FL AL042025
    1100 AM AST Thu Aug 07 2025

    ...DEXTER BECOMES A STORM-FORCE EXTRATROPICAL LOW OVER THE NORTH
    ATLANTIC...
    ...THIS IS THE FINAL NHC ADVISORY...


    SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION
    -----------------------------------------------
    LOCATION...41.4N 50.4W
    ABOUT 390 MI...625 KM SSE OF CAPE RACE NEWFOUNDLAND
    MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
    PRESENT MOVEMENT...ENE OR 70 DEGREES AT 17 MPH...28 KM/H
    MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES


    WATCHES AND WARNINGS
    --------------------
    There are no coastal watches or warnings in effect.


    DISCUSSION AND OUTLOOK
    ----------------------
    At 1100 AM AST (1500 UTC), the center of Post-Tropical Cyclone
    Dexter was located near latitude 41.4 North, longitude 50.4 West.
    The post-tropical cyclone is moving toward the east-northeast near
    17 mph (28 km/h) and this general motion is expected to continue
    during the next few days.

    Maximum sustained winds are near 60 mph (95 km/h) with higher gusts.
    Dexter is expected to continue strengthening as an extratropical low
    through early Friday. The cyclone is forecast to weaken beginning
    late Friday and Saturday.

    Tropical-storm-force winds extend outward up to 185 miles (280 km)
    from the center.

    The estimated minimum central pressure is 998 mb (29.47 inches).


    HAZARDS AFFECTING LAND
    ----------------------
    None.


    NEXT ADVISORY
    -------------
    This is the last public advisory issued by the National Hurricane
    Center on this system. Additional information on this system can be
    found in High Seas Forecasts issued by the National Weather Service,
    under AWIPS header NFDHSFAT1, WMO header FZNT01 KWBC, and online at
    ocean.weather.gov/shtml/NFDHSFAT1.php

    $$
    Forecaster Hagen
NHC Forecast Advisory on Eta
  • Thu, 07 Aug 2025 14:46:49 +0000: Atlantic Post-Tropical Cyclone Dexter Forecast/Adv... - Atlantic Post-Tropical Cyclone Dexter Forecast/Advisory Number 15
    685
    WTNT24 KNHC 071446
    TCMAT4

    POST-TROPICAL CYCLONE DEXTER FORECAST/ADVISORY NUMBER 15
    NWS NATIONAL HURRICANE CENTER MIAMI FL AL042025
    1500 UTC THU AUG 07 2025

    POST-TROPICAL CYCLONE CENTER LOCATED NEAR 41.4N 50.4W AT 07/1500Z
    POSITION ACCURATE WITHIN 30 NM

    PRESENT MOVEMENT TOWARD THE EAST-NORTHEAST OR 70 DEGREES AT 15 KT

    ESTIMATED MINIMUM CENTRAL PRESSURE 998 MB
    MAX SUSTAINED WINDS 50 KT WITH GUSTS TO 60 KT.
    50 KT....... 0NE 0SE 0SW 70NW.
    34 KT.......160NE 130SE 80SW 120NW.
    4 M SEAS.... 90NE 120SE 120SW 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 41.4N 50.4W AT 07/1500Z
    AT 07/1200Z CENTER WAS LOCATED NEAR 41.0N 51.4W

    FORECAST VALID 08/0000Z 42.6N 47.3W...POST-TROP/EXTRATROP
    MAX WIND 60 KT...GUSTS 75 KT.
    50 KT... 0NE 0SE 40SW 80NW.
    34 KT...170NE 150SE 100SW 130NW.

    FORECAST VALID 08/1200Z 44.2N 43.8W...POST-TROP/EXTRATROP
    MAX WIND 60 KT...GUSTS 75 KT.
    50 KT... 0NE 0SE 50SW 70NW.
    34 KT...140NE 170SE 130SW 130NW.

    FORECAST VALID 09/0000Z 45.2N 39.9W...POST-TROP/EXTRATROP
    MAX WIND 50 KT...GUSTS 60 KT.
    50 KT... 0NE 0SE 50SW 0NW.
    34 KT... 60NE 140SE 130SW 80NW.

    FORECAST VALID 09/1200Z 45.9N 35.4W...POST-TROP/EXTRATROP
    MAX WIND 45 KT...GUSTS 55 KT.
    34 KT... 0NE 100SE 100SW 0NW.

    FORECAST VALID 10/0000Z 46.5N 30.9W...POST-TROP/EXTRATROP
    MAX WIND 35 KT...GUSTS 45 KT.
    34 KT... 0NE 60SE 60SW 0NW.

    FORECAST VALID 10/1200Z 47.1N 26.8W...POST-TROP/EXTRATROP
    MAX WIND 30 KT...GUSTS 40 KT.

    EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 125 NM
    ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY

    OUTLOOK VALID 11/1200Z 48.0N 20.0W...POST-TROP/EXTRATROP
    MAX WIND 30 KT...GUSTS 40 KT.

    OUTLOOK VALID 12/1200Z...DISSIPATED

    REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 41.4N 50.4W

    THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE
    CENTER ON THIS SYSTEM. ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE
    FOUND IN HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER
    SERVICE...UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER FZNT01 KWBC.


    $$
    FORECASTER HAGEN
NHC Discussion on Eta
  • Thu, 07 Aug 2025 14:48:21 +0000: Atlantic Post-Tropical Cyclone Dexter Discussion Number 15 - Atlantic Post-Tropical Cyclone Dexter Discussion Number 15
    531
    WTNT44 KNHC 071448
    TCDAT4

    Post-Tropical Cyclone Dexter Discussion Number 15
    NWS National Hurricane Center Miami FL AL042025
    1100 AM AST Thu Aug 07 2025

    Satellite imagery and surface observations indicate that Dexter has
    completed its transition to an extratropical cyclone. Strong
    westerly wind shear is leaving an exposed, elongated center with all
    convection in the eastern semicircle. The convection is decreasing
    in strength and areal coverage, and it is also becoming more
    asymmetric. A warm front clearly extends east-northeastward from
    Dexter, and there also appears to be a developing cold front
    extending towards the southwest, as noted in an earlier AMSR2
    microwave pass. Surface marine observations show temperatures in
    the upper 50s and lower 60s just a couple hundred n mi northwest of
    Dexter's center. A recent partial ASCAT pass showed winds up to 45
    kt, but this pass did not sample the entire circulation. The
    initial intensity of the extratropical cyclone is increased to 50 kt
    based on the ASCAT data as well as global model analyses, which
    suggest the winds have likely reached 50 kt.

    Dexter is merging with an approaching mid- to upper-level trough.
    Global models show strengthening over the next 12-24 h due to
    baroclinic forcing due to the trough interaction. Thereafter, the
    cyclone will begin to steadily weaken late Friday into the weekend
    as the upper-level trough dampens out. The NHC intensity forecast is
    near the high end of the guidance during the first 24 hours of the
    forecast, and near the middle of the guidance envelope thereafter.
    The cyclone is forecast to weaken to a trough in 4 to 5 days.

    The initial motion is 070/15. A motion between northeast and
    east-northeast is expected during the next 24-36 hours as Dexter
    interacts with the aforementioned trough. After that time, a slight
    bend more toward the east is expected as the cyclone is steered by
    the mid-latitude flow. The new NHC forecast is a bit slower than
    the previous one, and lies in between the simple and corrected
    consensus aids.

    This is the final NHC advisory on Dexter. Additional information on
    this system can be found in High Seas Forecasts issued by the
    National Weather Service, under AWIPS header NFDHSFAT1, WMO header
    FZNT01 KWBC, and online at ocean.weather.gov/shtml/NFDHSFAT1.php


    FORECAST POSITIONS AND MAX WINDS

    INIT 07/1500Z 41.4N 50.4W 50 KT 60 MPH...POST-TROP/EXTRATROP
    12H 08/0000Z 42.6N 47.3W 60 KT 70 MPH...POST-TROP/EXTRATROP
    24H 08/1200Z 44.2N 43.8W 60 KT 70 MPH...POST-TROP/EXTRATROP
    36H 09/0000Z 45.2N 39.9W 50 KT 60 MPH...POST-TROP/EXTRATROP
    48H 09/1200Z 45.9N 35.4W 45 KT 50 MPH...POST-TROP/EXTRATROP
    60H 10/0000Z 46.5N 30.9W 35 KT 40 MPH...POST-TROP/EXTRATROP
    72H 10/1200Z 47.1N 26.8W 30 KT 35 MPH...POST-TROP/EXTRATROP
    96H 11/1200Z 48.0N 20.0W 30 KT 35 MPH...POST-TROP/EXTRATROP
    120H 12/1200Z...DISSIPATED

    $$
    Forecaster Hagen
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