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Hanna – 2020 Hurricane Season

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ATTENTION: The Last NHC Update has been issued on Hanna as of 7-26-2020. Any remaining advisories on this system will be issued by the WPC... All Graphics and Information on this page will eventually cease to update.

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NHC Public Advisory on Hanna
  • Sun, 26 Jul 2020 20:33:49 +0000: Atlantic Tropical Depression Hanna Advisory Number 16 - Atlantic Tropical Depression Hanna Advisory Number 16

    000
    WTNT33 KNHC 262033
    TCPAT3

    BULLETIN
    Tropical Depression Hanna Advisory Number 16
    NWS National Hurricane Center Miami FL AL082020
    400 PM CDT Sun Jul 26 2020

    ...HANNA WEAKENS TO A TROPICAL DEPRESSION OVER NORTHEASTERN
    MEXICO...
    ...HEAVY RAIN AND DANGEROUS FLASH FLOODING CONTINUE OVER FAR
    SOUTHEAST TEXAS AND NORTHEAST MEXICO...


    SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION
    ----------------------------------------------
    LOCATION...25.6N 100.6W
    ABOUT 35 MI...55 KM WSW OF MONTERREY MEXICO
    MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H
    PRESENT MOVEMENT...WSW OR 245 DEGREES AT 9 MPH...15 KM/H
    MINIMUM CENTRAL PRESSURE...1002 MB...29.59 INCHES


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

    Interests in northeastern Mexico should monitor the progress of
    Hanna. For storm information specific to your area, please monitor
    products issued by your national meteorological service.


    DISCUSSION AND OUTLOOK
    ----------------------
    At 400 PM CDT (2100 UTC), the center of Tropical Depression Hanna
    was located near latitude 25.6 North, longitude 100.6 West. The
    depression is moving toward the west-southwest near 9 mph (15 km/h),
    and this motion is expected to continue through Monday. On the
    forecast track, the center of Hanna should continue to move farther
    inland over northeastern Mexico.

    Maximum sustained winds have decreased to near 35 mph (55 km/h)
    with higher gusts. Additional weakening is expected as the center
    of Hanna moves farther inland. Hanna is expected to become a
    remnant low on Monday and dissipate by Monday night.

    The estimated minimum central pressure is 1002 mb (29.59 inches).


    HAZARDS AFFECTING LAND
    ----------------------
    Key messages for Hanna can be found in the Tropical Cyclone
    Discussion under AWIPS header MIATCDAT3, WMO header WTNT43 KNHC and
    on the web at www.hurricanes.gov/text/MIATCDAT3.shtml.

    RAINFALL: Hanna is expected to produce the following rain
    accumulations and flood threats through Monday:

    South Texas...Additional 2 to 5 inches. Storm total amounts 6 to 12
    inches, isolated 16 inches.
    Northern Mexican states of Coahuila, Nuevo Leon, Tamaulipas...6 to
    12 inches, isolated 16 inches.
    Northern Mexican states of northern Zacatecas, northern San Luis
    Potosi, and eastern Durango...1 to 4 inches.

    This rain will produce life-threatening flash flooding, rapid rises
    on small streams, and isolated minor river flooding in South Texas.
    Flash flooding and mudslides are likely across Northern Mexican
    states.

    SURF: Swells generated by Hanna will continue to affect much
    of the Texas and northeastern Mexico coasts through early Monday.
    These swells are likely to cause life-threatening surf and rip
    current conditions. Please consult products from your local weather
    office.

    TORNADOES: Isolated tornadoes are possible through this evening
    across parts of south Texas


    NEXT ADVISORY
    -------------
    This is the last public advisory issued by the National Hurricane
    Center on Hanna.

    Future information on this system can be found in Public Advisories
    issued by the Weather Prediction Center beginning at 10 PM CDT,
    under AWIPS header TCPAT3, WMO header WTNT33 KWNH, and on the web
    at http://www.wpc.ncep.noaa.gov.

    $$
    Forecaster Brown

NHC Forecast Advisory on Hanna
  • Sun, 26 Jul 2020 20:33:19 +0000: Atlantic Tropical Depression HANNA Forecast/Adviso... - Atlantic Tropical Depression HANNA Forecast/Advisory Number 16 NWS NATIONAL Hurricane CENTER MIAMI FL AL082020 2100 UTC SUN JUL 26 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. INTERESTS IN NORTHEASTERN MEXICO SHOULD MONITOR THE PROGRESS OF HANNA. FOR Storm INFORMATION SPECIFIC TO YOUR AREA, PLEASE MONITOR PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE. TROPICAL DEPRESSION CENTER LOCATED NEAR 25.6N 100.6W AT 26/2100Z POSITION ACCURATE WITHIN 40 NM PRESENT MOVEMENT TOWARD THE WEST-SOUTHWEST OR 245 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1002 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 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 25.6N 100.6W AT 26/2100Z AT 26/1800Z CENTER WAS LOCATED NEAR 25.9N 100.1W FORECAST VALID 27/0600Z 25.2N 101.6W...INLAND MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 27/1800Z 25.0N 102.6W...Post-TROP/INLAND MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 28/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 25.6N 100.6W THIS IS THE LAST FORECAST/Advisory ISSUED BY THE NATIONAL HURRICANE CENTER ON HANNA. FUTURE INFORMATION ON THIS SYSTEM CAN BE FOUND IN PUBLIC ADVISORIES ISSUED BY THE WEATHER PREDICTION CENTER BEGINNING AT 10 PM CDT, UNDER AWIPS HEADER TCPAT3, WMO HEADER WTNT33 KWNH, AND ON THE WEB AT HTTP://WWW.WPC.NCEP.NOAA.GOV. $$ FORECASTER BROWN

    103
    WTNT23 KNHC 262033
    TCMAT3

    TROPICAL DEPRESSION HANNA FORECAST/ADVISORY NUMBER 16
    NWS NATIONAL HURRICANE CENTER MIAMI FL AL082020
    2100 UTC SUN JUL 26 2020

    THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT.

    INTERESTS IN NORTHEASTERN MEXICO SHOULD MONITOR THE PROGRESS OF
    HANNA. FOR STORM INFORMATION SPECIFIC TO YOUR AREA, PLEASE MONITOR
    PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE.

    TROPICAL DEPRESSION CENTER LOCATED NEAR 25.6N 100.6W AT 26/2100Z
    POSITION ACCURATE WITHIN 40 NM

    PRESENT MOVEMENT TOWARD THE WEST-SOUTHWEST OR 245 DEGREES AT 8 KT

    ESTIMATED MINIMUM CENTRAL PRESSURE 1002 MB
    MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 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 25.6N 100.6W AT 26/2100Z
    AT 26/1800Z CENTER WAS LOCATED NEAR 25.9N 100.1W

    FORECAST VALID 27/0600Z 25.2N 101.6W...INLAND
    MAX WIND 25 KT...GUSTS 35 KT.

    FORECAST VALID 27/1800Z 25.0N 102.6W...POST-TROP/INLAND
    MAX WIND 20 KT...GUSTS 30 KT.

    FORECAST VALID 28/0600Z...DISSIPATED

    REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 25.6N 100.6W

    THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE
    CENTER ON HANNA. FUTURE INFORMATION ON THIS SYSTEM CAN BE FOUND IN
    PUBLIC ADVISORIES ISSUED BY THE WEATHER PREDICTION CENTER BEGINNING
    AT 10 PM CDT, UNDER AWIPS HEADER TCPAT3, WMO HEADER WTNT33 KWNH,
    AND ON THE WEB AT HTTP://WWW.WPC.NCEP.NOAA.GOV.

    $$
    FORECASTER BROWN



NHC Discussion on Hanna
  • Sun, 26 Jul 2020 20:34:20 +0000: Atlantic Tropical Depression Hanna Discussion Number 16 - Atlantic Tropical Depression Hanna Discussion Number 16

    000
    WTNT43 KNHC 262034
    TCDAT3

    Tropical Depression Hanna Discussion Number 16
    NWS National Hurricane Center Miami FL AL082020
    400 PM CDT Sun Jul 26 2020

    Surface observations along with radar and satellite imagery show
    that Hanna continues to weaken as it moves farther inland. There
    have been no recent observations of sustained tropical-storm-force
    winds, and Doppler velocities have continued to decrease. Based on
    these trends, the initial wind speed has been reduced to 30 kt.
    Hanna should continue to spin down while it moves over the high
    terrain of northeastern Mexico. The system is forecast to become
    a remnant low in 12-18 hours, and should dissipate over the
    mountains of Mexico by late Monday, if not sooner.

    Hanna is moving west-southwestward or 245/8 kt. The cyclone should
    continue on this general heading and speed until dissipation
    occurs. The updated NHC track forecast is again similar to the
    previous advisory and is close to the dynamical model consensus.

    This is the last NHC advisory on Hanna. Future information on this
    system can be found in Public Advisories issued by the Weather
    Prediction Center beginning at 10 PM CDT, under AWIPS header
    TCPAT3, WMO header WTNT33 KWNH, and on the web at
    http://www.wpc.ncep.noaa.gov.

    Key Messages

    1. Heavy rainfall from Hanna has already produced numerous reports
    of flash flooding across south Texas. Additional heavy rainfall
    will continue to result in life-threatening flash flooding over
    south Texas and northern Mexico, and isolated minor river flooding
    in south Texas.


    FORECAST POSITIONS AND MAX WINDS

    INIT 26/2100Z 25.6N 100.6W 30 KT 35 MPH...INLAND
    12H 27/0600Z 25.2N 101.6W 25 KT 30 MPH...INLAND
    24H 27/1800Z 25.0N 102.6W 20 KT 25 MPH...POST-TROP/INLAND
    36H 28/0600Z...DISSIPATED

    $$
    Forecaster Brown

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