• ADVISORY: TS Ida A17A

    From Weather Alert@454:1/105 to All on Mon Aug 30 10:21:00 2021
    902
    WTNT34 KNHC 301154
    TCPAT4

    BULLETIN
    Tropical Storm Ida Intermediate Advisory Number 17A
    NWS National Hurricane Center Miami FL AL092021
    700 AM CDT Mon Aug 30 2021

    ...IDA MOVING NORTHWARD OVER SOUTHWESTERN MISSISSIPPI...
    ...DANGEROUS STORM SURGE AND FLASH FLOODING CONTINUES OVER PORTIONS
    OF SOUTHEASTERN LOUISIANA, SOUTHERN MISSISSIPPI, AND SOUTHERN ALABAMA...


    SUMMARY OF 700 AM CDT...1200 UTC...INFORMATION ----------------------------------------------
    LOCATION...31.5N 90.8W
    ABOUT 65 MI...105 KM SSW OF JACKSON MISSISSIPPI
    MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
    PRESENT MOVEMENT...N OR 360 DEGREES AT 8 MPH...13 KM/H
    MINIMUM CENTRAL PRESSURE...993 MB...29.32 INCHES


    WATCHES AND WARNINGS
    --------------------
    CHANGES WITH THIS ADVISORY:

    None

    SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

    A Storm Surge Warning is in effect for...
    *Grand Isle, Louisiana, to the Alabama/Florida border

    A Tropical Storm Warning is in effect for...
    * Grand Isle, Louisiana, to the Alabama/Florida border, including
    Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans

    A Storm Surge Warning means there is a danger of life-threatening
    inundation from rising water moving inland from the coastline in
    the indicated locations. For a depiction of areas at risk, please
    see the National Weather Service Storm Surge Watch/Warning Graphic,
    available at hurricanes.gov. This is a life-threatening situation.
    Persons located within these areas should take all necessary
    actions to protect life and property from rising water and the
    potential for other dangerous conditions. Promptly follow
    evacuation and other instructions from local officials.

    A Tropical Storm Warning means that tropical storm conditions are
    expected somewhere within the warning area.

    For storm information specific to your area, including possible
    inland watches and warnings, please monitor products issued by your
    local National Weather Service forecast office.


    DISCUSSION AND OUTLOOK
    ----------------------
    At 700 AM CDT (1200 UTC), the center of Tropical Storm Ida was
    located by NOAA Doppler weather radars, satellite data, and surface observations near latitude 31.5 North, longitude 90.8 West. Ida is
    moving toward the north near 8 mph (13 km/h), and this general
    motion is forecast to continue today. A faster northeastward motion
    is expected to begin by tonight and continue on Tuesday. On the
    forecast track, the center of Ida will move farther inland over
    southwestern Mississippi this morning. Ida is then forecast to move
    over central and northeastern Mississippi this afternoon and
    tonight, and move across the Tennessee Valley on Tuesday.

    Maximum sustained winds have decreased to near 45 mph (75 km/h) with
    higher gusts. Additional rapid weakening is forecast during the next
    day or so, and Ida is expected to become a tropical depression this
    afternoon.

    Tropical-storm-force winds extend outward up to 150 miles (240 km),
    mainly southeast of the center over water. A coastal marine
    observing site at Dauphin Island, Alabama, recently reported
    sustained winds of 38 mph (61 km/h) and a gust to 46 mph (74 km/h).
    A wind gust to 45 mph (72 km/h) was recently measured at Biloxi,
    Mississippi.

    The estimated minimum central pressure is 993 mb (29.32 inches).


    HAZARDS AFFECTING LAND
    ----------------------
    Key messages for Ida can be found in the Tropical Cyclone
    Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC,
    and on the web at hurricanes.gov/graphics_at4.shtml?key_messages.

    STORM SURGE: The combination of a dangerous storm surge and the
    tide will cause normally dry areas near the coast to be flooded by
    rising waters moving inland from the shoreline. The water could
    reach the following heights above ground somewhere in the indicated
    areas if the peak surge occurs at the time of high tide...

    Pointe a la Hache, LA to Bay St. Louis, MS including Lake
    Borgne...4-6 ft
    Lake Maurepas and Lake Pontchartrain...4-6 ft
    Bay St. Louis, LA to AL/FL border including Mobile Bay...3-5 ft
    Grand Isle, LA to Pointe a la Hache, LA...2-4 ft
    Morgan City, LA to Grand Isle, LA...1-3 ft
    AL/FL border to Okaloosa/Walton County Line including Pensacola
    Bay...1-3 ft

    Overtopping of local levees outside of the Hurricane and Storm
    Damage Risk Reduction System is possible where local inundation
    values may be higher than those shown above.

    The deepest water will occur along the immediate coast near and to
    the east of the landfall location, where the surge will be
    accompanied by large and dangerous waves. Surge-related flooding
    depends on the relative timing of the surge and the tidal cycle, and
    can vary greatly over short distances. For information specific to
    your area, please see products issued by your local National Weather
    Service forecast office.

    WIND: Tropical storm conditions will continue over portions of
    Louisiana, southern Mississippi, and southern Alabama through this
    morning or early afternoon.

    RAINFALL: Through Tuesday morning, Ida will produce additional
    rainfall totals of 4 to 8 with localized higher amounts possible
    across portions of southeast Louisiana into far southern
    Mississippi. Storm total rainfall accumulations of 10 to 18 inches
    with isolated maximum amounts of 24 inches is expected. Heavy rain
    combined with storm surge has resulted in catastrophic impacts along
    the southeast coast of Louisiana with life threatening flash
    flooding and significant riverine flooding continuing farther
    inland.

    Ida is expected to turn northeast this morning and is forecast to
    track across the Middle Tennessee Valley, Ohio Valley and
    Mid-Atlantic through Wednesday, producing the following rainfall
    totals:

    Coastal Alabama to the far western Florida panhandle: An additional
    4 to 8 inches resulting in storm total accumulations of 6 to 12
    inches with isolated maximum amounts of 15 inches, today through
    Tuesday morning.

    Central Mississippi into far western Alabama: 4 to 8 inches with
    isolated maximum amounts of 12 inches, today through tonight.

    Middle Tennessee Valley, Ohio Valley, Central/Southern Appalachians
    into the Mid-Atlantic: 3 to 6 inches with isolated higher amounts,
    Tuesday into Wednesday.

    Considerable flash flooding is possible from the Lower Mississippi
    Valley through the Middle Tennessee Valley, Ohio Valley,
    Central/Southern Appalachians, and into the Mid-Atlantic. Widespread
    minor to isolated major riverine flooding is possible from the Lower Mississippi Valley into far western Alabama through Wednesday.

    TORNADOES: A few tornadoes are possible today into tonight, mainly
    across southeast Mississippi, southwest Alabama, and the western
    Florida Panhandle.

    SURF: Swells will continue to affect portions of the northern Gulf
    coast through today. These swells are likely to cause
    life-threatening surf and rip current conditions. Please consult
    products from your local weather office.


    NEXT ADVISORY
    -------------
    Next complete advisory at 1000 AM CDT.

    $$
    Forecaster Brown
    --- SBBSecho 3.12-Linux
    * Origin: Ilink: CCO - capitolcityonline.net (454:1/105)