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BULLETIN

Hurricane Delta Advisory Number 19

NWS National Hurricane Center Miami FL AL262020

400 AM CDT Fri Oct 09 2020

...MAJOR HURRICANE DELTA HEADED TOWARD SOUTHWESTERN LOUISIANA...

...EXPECTED TO BRING HURRICANE CONDITIONS AND A LIFE-THREATENING

STORM SURGE TO PORTIONS OF THE NORTHERN GULF COAST LATER TODAY...

SUMMARY OF 400 AM CDT...0900 UTC...INFORMATION

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LOCATION...26.9N 93.7W

ABOUT 200 MI...325 KM S OF CAMERON LOUISIANA

MAXIMUM SUSTAINED WINDS...120 MPH...195 KM/H

PRESENT MOVEMENT...N OR 350 DEGREES AT 12 MPH...19 KM/H

MINIMUM CENTRAL PRESSURE...953 MB...28.15 INCHES

WATCHES AND WARNINGS

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CHANGES WITH THIS ADVISORY:

The Tropical Storm Watch from east of the mouth of the Pearl River

to Bay St. Louis Mississippi has been discontinued.

A Storm Surge Warning has been discontinued from Ocean Springs, MS

to Mouth of the Pearl River, LA including Lake Pontchartrain and

Lake Maurepas

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...

* High Island Texas to Mouth of the Pearl River Louisiana 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

officials.

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

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At 400 AM CDT (0900 UTC), the center of Hurricane Delta was located

near latitude 26.9 North, longitude 93.7 West. Delta is moving

toward the north near 12 mph (19 km/h), and this motion is

expected to continue today followed by a north-northeastward motion

by tonight. On the forecast track, the center of Delta will move

inland within the hurricane warning area this evening.

Maximum sustained winds are near 120 mph (195 km/h) with higher

gusts. Delta is a category 3 hurricane on the Saffir-Simpson

Hurricane Wind Scale. Slow weakening is expected to begin as Delta

approaches the northern Gulf coast later today, with rapid

weakening expected after the center moves inland.

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 estimated minimum central pressure based on data from the Air

Force Hurricane Hunters and NOAA buoy 42002 is 953 mb (28.15

inches).

HAZARDS AFFECTING LAND

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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

Sabine Pass to Holly Beach, LA...4-7 ft

Morgan City, LA to Port Fourchon, LA...4-7 ft

Port Fourchon, LA to the Mouth of the Mississippi River...3-5 ft

Calcasieu Lake...3-5 ft

High Island, TX to Sabine Pass...2-4 ft

Mouth of the Mississippi River to 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

Bay...1-3 ft

Sabine Lake...1-3 ft

Port O'Connor, TX to High Island, TX including Galveston Bay...1-3

ft

It is important to note that small changes in the track, structure,

or intensity of Delta could have large impacts on where the highest

storm surge occurs. Users are urged to stay tuned for possible

changes and updates.

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 by this afternoon, with tropical storm conditions

expected within this area later this morning. Tropical

storm conditions are expected within the tropical storm warning

areas later today.

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

river flooding.

As the remnants of Delta move further 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 today and 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 ADVISORY

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Next intermediate advisory at 700 AM CDT.

Next complete advisory at 1000 AM CDT.

$$

Forecaster Cangialosi