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Hurricane Delta Advisory Number 21
NWS National Hurricane Center Miami FL AL262020
400 PM CDT Fri Oct 09 2020
...DELTA TO MAKE LANDFALL ON THE SOUTHWESTERN LOUISIANA COAST
DURING THE NEXT FEW HOURS...
...HURRICANE CONDITIONS AND A LIFE-THREATENING STORM SURGE EXPECTED
IN THE LANDFALL AREA...
SUMMARY OF 400 PM CDT...2100 UTC...INFORMATION
ABOUT 35 MI...55 KM S OF CAMERON LOUISIANA
MAXIMUM SUSTAINED WINDS...105 MPH...165 KM/H
PRESENT MOVEMENT...NNE OR 15 DEGREES AT 14 MPH...22 KM/H
MINIMUM CENTRAL PRESSURE...966 MB...28.53 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* High Island Texas to the Mouth of the Pearl River including
Calcasieu Lake, Vermilion Bay, and Lake Borgne
A Hurricane Warning is in effect for...
* High Island Texas to Morgan City Louisiana
A Tropical Storm Warning is in effect for...
* West of High Island to Sargent Texas
* East of Morgan City Louisiana to the mouth of the Pearl River,
including New Orleans
* Lake Pontchartrain and Lake Maurepas
A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 36 hours 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
A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area. A warning is typically issued 36
hours before the anticipated first occurrence of tropical-storm-
force winds, conditions that make outside preparations difficult or
dangerous. 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 400 PM CDT (2100 UTC), the center of Hurricane Delta was located
near latitude 29.3 North, longitude 93.2 West. Delta is moving
toward the north-northeast near 14 mph (22 km/h), and this motion is
expected to continue through Saturday morning. A motion toward the
northeast is then expected through Sunday night. On the forecast
track, the center of Delta should make landfall along the coast of
southwestern Louisiana during the next few hours, and then move
across central and northeastern Louisiana tonight and Saturday
morning. After that time, the system is forecast to moves across
northern Mississippi into the Tennessee Valley.
Maximum sustained winds are near 105 mph (165 km/h) with higher
gusts. Some weakening is possible before landfall, with rapid
weakening expected after landfall. Delta is forecast to weaken to
a tropical storm tonight and to a tropical depression on Saturday.
Hurricane-force winds extend outward up to 40 miles (65 km) from the
center and tropical-storm-force winds extend outward up to 160 miles
(260 km). The Texas Coastal Ocean Observation Network station at
Texas Point recently reported sustained winds of 62 mph (100 km/h)
and a wind gust of 78 mph (126 km/h). The National Ocean Service
station at Calcasieu Pass, Louisiana, recently reported sustained
winds of 53 mph (85 km/h) and a wind gust of 64 mph (104 km/h).
The estimated minimum central pressure is 966 mb (28.53 inches).
The National Ocean Service station at Calcasieu Pass recently
reported a pressure of 983.8 mb (29.05 inches).
HAZARDS AFFECTING LAND
Key messages for Delta 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.
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...
Rockefeller Wildlife Refuge, LA to Morgan City, LA including
Vermilion Bay...7-11 ft
Holly Beach, LA to Rockefeller Wildlife Refuge, LA...5-8 ft
Morgan City, LA to Port Fourchon, LA...4-6 ft
Sabine Pass to Holly Beach, LA...3-5 ft
Calcasieu Lake...2-4 ft
High Island, TX to Sabine Pass...2-4 ft
Port Fourchon, LA to the Mouth of the Pearl River...2-4 ft
Lake Borgne...2-4 ft
Lake Pontchartrain and Lake Maurepas...1-3 ft
Mouth of the Pearl River, LA to the AL/FL border including Mobile
Sabine Lake...1-3 ft
Port O'Connor, TX to High Island, TX including Galveston Bay...
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: Hurricane conditions are expected within the hurricane
warning area during the next few hours, with tropical storm
conditions already occuring. Tropical storm conditions will
continue to spread onshore within portions of the tropical storm
warning areas during the next several hours.
RAINFALL: Today through Saturday, Delta is expected to produce 5 to
10 inches of rain, with isolated maximum totals of 15 inches, from
southwest into central Louisiana. These rainfall amounts will lead
to significant flash, urban, small stream flooding, along with minor
to major river flooding.
For extreme east Texas into northern Louisiana, southern Arkansas,
and western Mississippi, Delta is expected to produce 3 to 6 inches
of rain, with isolated maximum totals of 10 inches. These rainfall
amounts will lead to flash, urban, small stream, and isolated minor
As the remnants of Delta move farther inland, 1 to 3 inches of rain,
with locally higher amounts, are expected in the Tennessee Valley
and Mid Atlantic this weekend. There is a potential for 3 to 6
inches in the Southern Appalachians, which could lead to isolated
flash, urban, and small stream flooding.
TORNADOES: A few tornadoes are possible this afternoon through
tonight over southern portions of Louisiana and Mississippi.
SURF: Swells from Delta are affecting portions of the northern and
western Gulf coast. These swells are likely to cause life-
threatening surf and rip current conditions. Please consult
products from your local weather office.
Next intermediate advisory at 700 PM CDT.
Next complete advisory at 1000 PM CDT.