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Iota – Final Advisory Issued 11-18-2020 – 2020 Hurricane Season

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ATTENTION: The NHC has issued it's last advisory on Iota as of 11-18-2020. All Graphics and Information on this page will eventually cease to update.

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NHC Public Advisory on Iota
  • Wed, 18 Nov 2020 14:40:59 +0000: Atlantic Remnants Of Iota Advisory Number 21 - Atlantic Remnants Of Iota Advisory Number 21

    000
    WTNT31 KNHC 181440
    TCPAT1

    BULLETIN
    Remnants Of Iota Advisory Number 21
    NWS National Hurricane Center Miami FL AL312020
    900 AM CST Wed Nov 18 2020

    ...IOTA DISSIPATES OVER CENTRAL AMERICA...
    ...HEAVY RAIN THREAT CONTINUES...


    SUMMARY OF 900 AM CST...1500 UTC...INFORMATION
    ----------------------------------------------
    LOCATION...13.8N 89.5W
    ABOUT 20 MI...35 KM WNW OF SAN SALVADOR EL SALVADOR
    MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
    PRESENT MOVEMENT...W OR 270 DEGREES AT 12 MPH...19 KM/H
    MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES


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


    DISCUSSION AND OUTLOOK
    ----------------------
    At 900 AM CST (1500 UTC), the remnants of Iota were located near
    latitude 13.8 North, longitude 89.5 West. The remnants are moving
    toward the west near 12 mph (19 km/h), and this general motion is
    expected to continue today.

    Maximum sustained winds are near 30 mph (45 km/h) with higher gusts.

    The estimated minimum central pressure is 1006 mb (29.71 inches).


    HAZARDS AFFECTING LAND
    ----------------------
    Key messages for Iota can be found in the Tropical Cyclone
    Discussion under AWIPS header MIATCDAT1, WMO header WTNT41 KNHC
    and on the web at www.hurricanes.gov/text/MIATCDAT1.shtml.

    RAINFALL: The remnants of Iota are expected to produce the
    following additional rainfall accumulations through Thursday:

    Portions of Honduras, Guatemala, southern Belize: 4 to 8 inches (100
    to 200 mm), with isolated maximum totals of 12 inches (300 mm).

    Portions of Nicaragua and El Salvador: 2 to 4 inches (50 to 100 mm),
    with isolated maximum totals of 6 inches (150 mm).

    This rainfall will lead to significant, life-threatening flash
    flooding and river flooding, along with mudslides in areas of higher
    terrain.

    SURF: Swells generated by Iota will affect much of the coast of
    Central America and the Yucatan Peninsula during the next day or so.
    These swells are likely to cause life-threatening surf and rip
    current conditions. Please consult products from your local weather
    office.


    NEXT ADVISORY
    -------------
    This is the last public advisory issued by the National Hurricane
    Center on this system. For additional information on the remnants,
    please see High Seas Forecasts issued by the National Weather
    Service, under AWIPS header NFDHSFEPI, WMO header FZPN02 KWBC, and
    on the web at ocean.weather.gov/shtml/NFDHSFEPI.php


    $$
    Forecaster Pasch

NHC Forecast Advisory on Iota
  • Wed, 18 Nov 2020 14:40:32 +0000: Atlantic Remnants of IOTA Forecast/Advisory Number... - Atlantic Remnants of IOTA Forecast/Advisory Number 21 NWS NATIONAL Hurricane CENTER MIAMI FL AL312020 1500 UTC WED NOV 18 2020 SUMMARY OF WATCHES AND WARNINGS IN EFFECT... THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. REMNANTS OF CENTER LOCATED NEAR 13.8N 89.5W AT 18/1500Z POSITION ACCURATE WITHIN 15 NM PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 10 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1006 MB MAX SUSTAINED WINDS 25 KT WITH GUSTS TO 35 KT. 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 13.8N 89.5W AT 18/1500Z AT 18/1200Z CENTER WAS LOCATED NEAR 13.8N 89.0W FORECAST VALID 19/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.8N 89.5W THIS IS THE LAST FORECAST/Advisory ISSUED BY THE NATIONAL HURRICANE CENTER ON THIS SYSTEM. FOR ADDITIONAL INFORMATION ON THE REMNANTS, PLEASE SEE HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE...UNDER AWIPS HEADER NFDHSFEPI AND WMO HEADER FZPN02 KWBC. $$ FORECASTER PASCH

    000
    WTNT21 KNHC 181440
    TCMAT1

    REMNANTS OF IOTA FORECAST/ADVISORY NUMBER 21
    NWS NATIONAL HURRICANE CENTER MIAMI FL AL312020
    1500 UTC WED NOV 18 2020

    SUMMARY OF WATCHES AND WARNINGS IN EFFECT...

    THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT.

    REMNANTS OF CENTER LOCATED NEAR 13.8N 89.5W AT 18/1500Z
    POSITION ACCURATE WITHIN 15 NM

    PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 10 KT

    ESTIMATED MINIMUM CENTRAL PRESSURE 1006 MB
    MAX SUSTAINED WINDS 25 KT WITH GUSTS TO 35 KT.
    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 13.8N 89.5W AT 18/1500Z
    AT 18/1200Z CENTER WAS LOCATED NEAR 13.8N 89.0W

    FORECAST VALID 19/1200Z...DISSIPATED

    REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.8N 89.5W

    THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE
    CENTER ON THIS SYSTEM. FOR ADDITIONAL INFORMATION ON THE REMNANTS,
    PLEASE SEE HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER
    SERVICE...UNDER AWIPS HEADER NFDHSFEPI AND WMO HEADER FZPN02 KWBC.

    $$
    FORECASTER PASCH


NHC Discussion on Iota
  • Wed, 18 Nov 2020 14:44:43 +0000: Atlantic Remnants Of Iota Discussion Number 21 - Atlantic Remnants Of Iota Discussion Number 21

    777
    WTNT41 KNHC 181444
    TCDAT1

    Remnants Of Iota Discussion Number 21
    NWS National Hurricane Center Miami FL AL312020
    900 AM CST Wed Nov 18 2020

    Although the system still has broad mid-level rotation, synoptic
    observations from Central America show that the surface circulation
    of Iota has dissipated. Its remnants are located somewhere near El
    Salvador.

    Although the remnants of Iota are likely to move into the eastern
    North Pacific during the next day or so, the global models do not
    show regeneration of the system over that basin.

    Iota is still expected to produce very serious flash flooding and
    mudslides, with potentially catastrophic effects, over
    portions of Central America.

    This is the last advisory issued by the National Hurricane Center
    on Iota.


    Key Messages:

    1. Life-threatening flash flooding and river flooding is expected
    through Thursday across portions of Central America due to heavy
    rainfall from the remnants of Iota. Flooding and mudslides across
    portions of Honduras, Nicaragua and Guatemala could be exacerbated
    by saturated soils in place, resulting in significant to
    potentially catastrophic impacts.


    FORECAST POSITIONS AND MAX WINDS

    INIT 18/1500Z 13.8N 89.5W 25 KT 30 MPH...REMNANTS OF IOTA
    12H 19/0000Z...DISSIPATED

    $$
    Forecaster Pasch


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