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Hurricane Zeta Intermediate Advisory Number 16A
NWS National Hurricane Center Miami FL AL282020
100 PM CDT Wed Oct 28 2020
...ZETA STRENGTHENS SOME MORE...
...EXPECTED TO BRING HURRICANE CONDITIONS TO A PORTION OF THE
NORTHERN GULF COAST LATER THIS AFTERNOON...
SUMMARY OF 100 PM CDT...1800 UTC...INFORMATION
ABOUT 145 MI...235 KM SW OF THE MOUTH OF THE MISSISSIPPI RIVER
ABOUT 155 MI...255 KM SSW OF NEW ORLEANS LOUISIANA
MAXIMUM SUSTAINED WINDS...100 MPH...155 KM/H
PRESENT MOVEMENT...NNE OR 25 DEGREES AT 20 MPH...35 KM/H
MINIMUM CENTRAL PRESSURE...975 MB...28.79 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* Mouth of the Atchafalaya River to Navarre Florida
* Lake Borgne, Lake Pontchartrain, Pensacola Bay and Mobile Bay
A Hurricane Warning is in effect for...
* Morgan City Louisiana to the Mississippi/Alabama border
* Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans
A Tropical Storm Warning is in effect for...
* Mississippi/Alabama border to Walton/Bay County Line Florida
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 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 100 PM CDT (1800 UTC), the center of Hurricane Zeta was located
near latitude 27.9 North, longitude 91.1 West. Zeta is moving
toward the north-northeast near 20 mph (35 km/h). A faster
north-northeastward motion is expected through tonight followed by
an even faster northeastward motion on Thursday and an
east-northeastward motion early Friday. On the forecast track, the
center of Zeta will make landfall in southeastern Louisiana this
afternoon. Zeta will then move close to the Mississippi coast this
evening, and move across the southeastern and eastern United States
Maximum sustained winds have increased to near 100 mph (155 km/h)
with higher gusts. Some additional strengthening is possible during
the next few hours, and Zeta is expected to reach the northern Gulf
Coast as a hurricane before weakening over the southeastern United
States on Thursday.
Hurricane-force winds extend outward up to 35 miles (55 km) from
the center and tropical-storm-force winds extend outward up to 150
miles (240 km).
The minimum central pressure reported by an Air Force Hurricane
Hunter aircraft is 975 mb (28.79 inches).
HAZARDS AFFECTING LAND
Key messages for Zeta 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.
STORM SURGE: Along the northern Gulf Coast, 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...
Mouth of the Pearl River to Dauphin Island AL...6-9 ft
Port Fourchon LA to the Mouth of the Mississippi River...5-8 ft
Mouth of the Mississippi River to the Mouth of the Pearl River
including Lake Borgne...5-7 ft
Mouth of the Atchafalaya River to Port Fourchon LA...4-6 ft
Mobile Bay...4-6 ft
Dauphin Island AL to AL/FL border...3-5 ft
Lake Pontchartrain...3-5 ft
AL/FL border to Navarre FL including Pensacola Bay...2-4 ft
Intracoastal City LA to the Mouth of the Atchafalaya River including
Vermilion Bay...1-3 ft
Navarre FL to Yankeetown FL including Choctawhatchee Bay and Saint
Andrew Bay...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 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: Hurricane conditions are expected within the Hurricane
Warning area on the northern Gulf Coast later this afternoon, with
tropical storm conditions beginning within the next few hours.
Tropical storm conditions are expected within the Tropical Storm
Warning area on the northern Gulf Coast by late today.
Damaging winds, especially in gusts, will spread well inland across
portions of southeastern Mississippi, Alabama, and northern Georgia
this evening through early Thursday morning, and into the Carolinas
and southeastern Virginia on Thursday. Wind gusts could be
especially severe across the southern Appalachian Mountains on
RAINFALL: Areas of heavy rainfall, both in advance of and along the
track of Zeta, will impact areas from the central Gulf Coast to
the Mid-Mississippi and Ohio Valleys, and eastward into the
southern to central Appalachians and Mid-Atlantic today through
Thursday. Rainfall totals of 2 to 4 inches with isolated amounts
of 6 inches are expected across these areas, resulting in flash,
urban, small stream, and minor river flooding.
TORNADOES: A few tornadoes are expected this afternoon through
tonight over southeastern parts of Louisiana and Mississippi,
southern Alabama, and the western Panhandle of Florida.
Next complete advisory at 400 PM CDT.
Hourly Tropical Cyclone Updates will begin at 200 PM CDT. These
can be found under WMO header WTNT63 KNHC and under AWIPS header