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Tropical Storm Harvey Intermediate Advisory Number 41A
NWS National Hurricane Center Miami FL AL092017
100 PM CDT Wed Aug 30 2017
...HARVEY WEAKENING AS IT MOVES FARTHER INLAND...
...FLOODING RAINS CONTINUING OVER EXTREME SOUTHEASTERN TEXAS AND
SUMMARY OF 100 PM CDT...1800 UTC...INFORMATION
ABOUT 35 MI...55 KM NNW OF LAKE CHARLES LOUISIANA
ABOUT 70 MI...110 KM SW OF ALEXANDRIA LOUISIANA
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...NNE OR 20 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...995 MB...29.38 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The Tropical Storm Warning is discontinued west of Sabine Pass,
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* Holly Beach Louisiana to Morgan City Louisiana
A Storm Surge Watch is in effect for...
* Sabine Pass Texas to west of Holly Beach Louisiana
A Tropical Storm Warning is in effect for...
* Sabine Pass Texas to Grand Isle Louisiana
Catastrophic and life-threatening flooding continues in southeastern
Texas and portions of southwestern Louisiana. Please see warnings
and other products issued by your local National Weather Service
office for additional information on this life-threatening
A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 12 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.
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 48-HOUR OUTLOOK
At 100 PM CDT (1800 UTC), the center of Tropical Storm Harvey was
located near latitude 30.6 North, longitude 93.3 West. Harvey is
moving erratically toward the north-northeast near 8 mph (13 km/h)
and this general motion is expected to continue through Thursday. A
turn toward the northeast is expected Thursday night and Friday. On
the forecast track, the center of Harvey should move through
southwestern and central Louisiana today and tonight, then move
through northeastern Louisiana and northwestern Mississippi Thursday
and Thursday night.
Maximum sustained winds have decreased to near 40 mph (65 km/h) with
higher gusts, mainly over water to the south and southeast of the
center. Additional weakening is forecast during the next 48 hours
as Harvey moves farther inland, and the cyclone is expected to
weaken to a tropical depression tonight.
Tropical-storm-force winds extend outward up to 80 miles (130 km)
mainly to the south and southeast of the center. During the past
few hours, there have been reports of wind gusts of 40-45 mph (65-70
km/h) in southwestern Louisiana and southeastern Texas near Cameron
and Sabine Pass.
The minimum central pressure based on surface observations is 995
mb (29.38 inches).
HAZARDS AFFECTING LAND
RAINFALL: Harvey is expected to produce additional rainfall
accumulations of 3 to 6 inches from southwestern Louisiana and the
adjacent border of eastern Texas northeastward into western
Tennessee and Kentucky through Friday with isolated amounts up to
10 inches. The threat of heavy rains has ended in the Houston/
Galveston area. However catastrophic and life threatening flooding
will continue in and around Houston, Beaumont/Port Arthur, eastward
into southwest Louisiana for the rest of the week. The expected
heavy rains spreading northeastward from Louisiana into western
Kentucky may also lead to flash flooding and increased river and
small stream flooding. DO NOT ATTEMPT TO TRAVEL IN THE AFFECTED
AREA IF YOU ARE IN A SAFE PLACE. DO NOT DRIVE INTO FLOODED
ROADWAYS. Please see warnings and products issued by your local
National Weather Service office for additional information on this
Elsewhere, the outer bands of Harvey are expected to produce
additional rainfall amounts of 3 to 6 inches over portions of the
central and eastern Gulf States and 2 to 4 inches farther north into
parts of the Tennessee Valley, Ohio Valley and southern Mid Atlantic
through Saturday. These rains may lead to flooding concerns across
A list of preliminary rainfall observations compiled by the NOAA
Weather Prediction Center can be found at:
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 is
expected to reach the following heights above ground if the peak
surge occurs at the time of high tide...
Holly Beach to Morgan City...2 to 4 ft
San Luis Pass to west of Holly Beach incl. Galveston Bay...1 to 3 ft
Morgan City to Grand Isle...1 to 3 ft
The deepest water will occur along the immediate coast near the
area of onshore winds. 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 are occurring over portions of
the warning area along the coast and are likely to persist through
SURF: Swells generated by Harvey are still affecting the coasts of
Texas and Louisiana. These swells are likely to cause life-
threatening surf and rip current conditions. Please consult products
from your local weather office.
TORNADOES: A few tornadoes are possible today and tonight over
parts of Louisiana, Mississippi, southern Alabama, and southeast
Next complete advisory at 400 PM CDT.