• Laura Develops Into A Cat 4 Monster







    BULLETIN
    Hurricane Laura Advisory Number 28
    NWS National Hurricane Center Miami FL AL132020
    400 PM CDT Wed Aug 26 2020

    ...WIND AND WATER LEVELS INCREASING AS EXTREMELY DANGEROUS
    HURRICANE LAURA TAKES AIM AT THE NORTHWEST GULF COAST...
    ...CATASTROPHIC STORM SURGE, EXTREME WINDS, AND FLASH FLOODING
    EXPECTED ALONG THE NORTHWEST GULF COAST TONIGHT...


    SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION
    ----------------------------------------------
    LOCATION...27.9N 92.8W
    ABOUT 155 MI...250 KM S OF LAKE CHARLES LOUISIANA
    ABOUT 155 MI...250 KM SSE OF PORT ARTHUR TEXAS
    MAXIMUM SUSTAINED WINDS...145 MPH...230 KM/H
    PRESENT MOVEMENT...NW OR 320 DEGREES AT 15 MPH...24 KM/H
    MINIMUM CENTRAL PRESSURE...947 MB...27.97 INCHES





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

    The Storm Surge Watch has been discontinued east of the Mouth of
    the Mississippi River, including Lake Pontchartrain, Lake
    Maurepas, and Lake Borgne.

    SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

    A Storm Surge Warning is in effect for...
    * Freeport Texas to the Mouth of the Mississippi River

    A Hurricane Warning is in effect for...
    * San Luis Pass Texas to Intracoastal City Louisiana

    A Tropical Storm Warning is in effect for...
    * Sargent Texas to San Luis Pass
    * East of Intracoastal City Louisiana to the Mouth of the
    Mississippi River






    A Hurricane Watch is in effect for...
    * East of Intracoastal City to west of Morgan City Louisiana

    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 Hurricane Warning means that hurricane conditions are expected
    somewhere within the warning area. Preparations to protect life
    and property should be rushed to completion.

    A Hurricane Watch means that hurricane conditions are possible
    within the watch area.

    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 400 PM CDT (2100 UTC), the eye of Hurricane Laura was located
    near latitude 27.9 North, longitude 92.8 West. Laura is moving
    toward the northwest near 15 mph (24 km/h). A turn toward the
    north-northwest and north is expected tonight, and a northward
    motion should continue on Thursday. A northeastward to east-
    northeastward motion is expected Thursday night and Friday. On the
    forecast track, Laura will approach the Upper Texas and southwest
    Louisiana coasts this evening and move inland within that area
    tonight. The center of Laura is forecast to move over northwestern
    Louisiana tomorrow, across Arkansas Thursday night, and over the
    mid-Mississippi Valley on Friday.

    Reports from an Air Force Reserve hurricane hunter aircraft indicate
    that the maximum sustained winds have increased to near 145 mph (230
    km/h) with higher gusts. Laura is an extremely dangerous category 4
    hurricane on the Saffir-Simpson Hurricane Wind Scale. Some
    additional strengthening is possible this evening before Laura
    reaches the northwest Gulf coast overnight. Rapid weakening is
    expected after Laura moves inland.

    Hurricane-force winds extend outward up to 60 miles (95 km) from the
    center and tropical-storm-force winds extend outward up to 205 miles
    (335 km).

    The latest minimum central pressure reported by an Air Force
    Reserve reconnaissance aircraft is 947 mb (27.97 inches).


    HAZARDS AFFECTING LAND
    ----------------------
    Key messages for Laura can be found in the Tropical Cyclone
    Discussion under AWIPS header MIATCDAT3 and WMO header WTNT43 KNHC.

    Storm surge and tropical-storm-force winds will arrive within the
    warning areas well in advance of Laura's center. All preparations
    to protect life and property should be rushed to completion in the
    next few hours.

    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...

    Johnson Bayou LA to Rockefeller Wildlife Refuge including Calcasieu
    Lake...15-20 ft
    Sea Rim State Park TX to Johnson Bayou LA including Sabine
    Lake...10-15 ft
    Rockefeller Wildlife Refuge to Intracoastal City LA...10-15 ft
    Intracoastal City LA to Morgan City including Vermilion Bay...8-12
    ft
    Port Bolivar TX to Sea Rim State Park...6-9 ft
    Morgan City LA to Mouth of the Mississippi River...4-7 ft
    Freeport TX to Port Bolivar including Galveston Bay...2-4 ft
    Mouth of the Mississippi River to Ocean Springs MS including Lake
    Borgne...1-3 ft
    Lake Pontchartrain and Lake Maurepas...1-3 ft

    The deepest water will occur along the immediate coast near and to
    the right of the landfall location, where the surge will be
    accompanied by large and destructive waves.

    Unsurvivable storm surge with large and destructive waves will cause
    catastrophic damage from Sea Rim State Park, Texas, to Intracoastal
    City, Louisiana, including Calcasieu and Sabine Lakes. This surge
    could penetrate up to 40 miles inland from the immediate coastline,
    and flood waters will not fully recede for several days after the
    storm.

    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: Hurricane conditions are expected in the hurricane warning
    area tonight and Thursday, with catastrophic wind damage expected
    where Laura's eyewall moves onshore tonight. Tropical storm
    conditions are moving onshore along the coast of Louisiana within
    the tropical storm warning area and are expected to spread
    northwestward within the warning areas this evening.

    Hurricane-force winds and damaging wind gusts are also expected to
    spread well inland into portions of eastern Texas and western
    Louisiana early Thursday.

    RAINFALL: From this afternoon through Friday, Laura is expected to
    produce the following rainfall totals:

    Across the northwestern Gulf Coast from far southwest Louisiana and
    the Golden Triangle of Southeast Texas: 8 to 12 inches with isolated
    totals of 18 inches.

    Across central and the rest of western Louisiana into far eastern
    Texas: 5 to 10 inches with isolated totals of 15 inches.

    Across much of Arkansas: 3 to 7 inches with isolated totals of 10
    inches.

    This rainfall will cause widespread flash and urban flooding, small
    streams and creeks to overflow their banks, and minor to moderate
    freshwater river flooding.

    By Friday into Saturday, Laura is expected to produce the following
    rainfall totals:

    Across the mid-Mississippi and portions of the Tennessee Valley,
    Lower Ohio Valley, and central Appalachians: 2 to 4 inches with
    isolated maximum amounts of 6 inches.

    This rainfall may lead to flash and urban flooding and rapid rises
    on small streams.

    Across the Mid-Atlantic Region: 1 to 3 inches.

    TORNADOES: Several tornadoes are expected late this afternoon
    through tonight over Louisiana, far southeast Texas, and
    southwestern Mississippi. The risk for a few tornadoes will continue
    into Thursday across Louisiana, Arkansas, and western Mississippi.

    SURF: Swells produced by Laura are affecting the U.S. Gulf coast
    from the west coast of Florida to Texas and northeastern Mexico.
    These swells are likely to cause life-threatening surf and rip
    current conditions. Please consult products from your local
    weather office.


    NEXT ADVISORY
    -------------
    Next intermediate advisory at 700 PM CDT.
    Next complete advisory at 1000 PM CDT.

    Hourly Tropical Cyclone Updates will be issued between Public
    advisories. These can be found under WMO header WTNT63 KNHC and
    under AWIPS header MIATCUAT3.


    https://www.nhc.noaa.gov/refresh/gra...sages#contents
    This article was originally published in forum thread: Laura Develops Into A Cat 4 Monster started by Photoboy View original post