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Tropical Storm Harvey Intermediate Advisory Number 40A
NWS National Hurricane Center Miami FL AL092017
700 AM CDT Wed Aug 30 2017
...CENTER OF HARVEY OVER SOUTHWESTERN LOUISIANA...
...FLOODING RAINS CONTINUING OVER EXTREME SOUTHEASTERN TEXAS AND
SUMMARY OF 700 AM CDT...1200 UTC...INFORMATION
ABOUT 25 MI...40 KM WNW OF LAKE CHARLES LOUISIANA
ABOUT 30 MI...50 KM NE OF PORT ARTHUR TEXAS
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...N OR 360 DEGREES AT 9 MPH...14 KM/H
MINIMUM CENTRAL PRESSURE...992 MB...29.29 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
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...
* East of High Island Texas to west of Holly Beach Louisiana
A Tropical Storm Warning is in effect for...
* East of High Island 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 700 AM CDT (1200 UTC), the center of Tropical Storm Harvey was
located over southwestern Louisiana near latitude 30.2 North,
longitude 93.6 West. Harvey has been moving toward the north at
about 9 mph (14 km/h) for the past several hours. The storm is
expected to move north-northeastward later this morning, and then
a northeastward motion at a faster forward speed is expected through
Thursday night. On the forecast track, the center of Harvey will
move across the Lower Mississippi Valley and Tennessee Valley
Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
Gradual weakening is forecast as the center moves farther inland,
and Harvey is expected to become a tropical depression by tonight.
Tropical-storm-force winds extend outward up to 80 miles (130 km)
from the center. A National Ocean Service station at Texas Point,
Texas, recently reported a wind gust of 42 mph (68 km/h), while the
Orange County Airport in Orange, Texas recently reported a wind gust
of 41 mph (66 km/h).
The estimated minimum central pressure based on surface observations
is 992 mb (29.29 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 Kentucky
through Friday with isolated amounts up to 10 inches. While the
threat of heavy rains has ended in the Houston/Galveston area,
catastrophic and life-threatening flooding will continue in and
around Houston 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 life-threatening situation.
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 through Friday. These rains may lead
to flooding concerns across these areas.
A list of 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 2 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 1000 AM CDT.