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Tropical Storm Harvey Intermediate Advisory Number 34A
NWS National Hurricane Center Miami FL AL092017
700 PM CDT Mon Aug 28 2017
...HEAVY RAINS SPREADING INTO THE GREATER HOUSTON AREA WHERE
CATASTROPHIC FLOODING CONTINUES...
...DO NOT ATTEMPT TO TRAVEL IN THE AFFECTED AREAS IF YOU ARE IN
A SAFE PLACE AND DO NOT DRIVE INTO FLOODED ROADWAYS...
SUMMARY OF 700 PM CDT...0000 UTC...INFORMATION
ABOUT 55 MI...90 KM E OF PORT OCONNOR TEXAS
ABOUT 150 MI...245 KM SW OF PORT ARTHUR TEXAS
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...ESE OR 120 DEGREES AT 3 MPH...6 KM/H
MINIMUM CENTRAL PRESSURE...997 MB...29.44 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Tropical Storm Warning is in effect for...
* Mesquite Bay to Intracoastal City
A Storm Surge Watch is in effect for...
* Port Bolivar to Morgan City
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 Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area within 36 hours.
A Storm Surge Watch means there is a possibility of life-
threatening inundation, from rising water moving inland from the
coastline, in the indicated locations during the next 48 hours.
For a depiction of areas at risk, please see the National Weather
Service Storm Surge Watch/Warning Graphic, available at
Interests elsewhere along the middle and upper Texas coast and in
southern Louisiana should continue to monitor the progress of
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 PM CDT (0000 UTC), the center of Tropical Storm Harvey was
located near latitude 28.2 North, longitude 95.5 West. Harvey is
moving toward the east-southeast near 3 mph (6 km/h), and a slow
motion toward the southeast is expected through tonight. A gradual
turn toward the northeast and a continued slow forward speed are
expected Tuesday and Tuesday night. On the forecast track, the
center of Harvey is expected to be just offshore of the middle and
upper coasts of Texas through Tuesday night, then move inland over
the northwestern Gulf coast on Wednesday.
Maximum sustained winds are near 45 mph (75 km/h) with higher
gusts. Little change in strength is forecast during the next 48
Tropical-storm-force winds extend outward up to 175 miles (280 km)
from the center. The National Ocean Service automated station at
the Matagorda Bay entrance recently reported sustained winds of 41
mph (67 km/h) and a wind gust of 55 mph (89 km/h).
The minimum central pressure estimated from buoy observations is
997 mb (29.44 inches).
HAZARDS AFFECTING LAND
RAINFALL: Harvey is expected to produce additional rainfall
accumulations of 10 to 20 inches through Thursday over parts of the
upper Texas coast into southwestern Louisiana. Isolated storm
totals may reach 50 inches over the upper Texas coast, including the
Houston/Galveston metropolitan area. These rains are currently
producing catastrophic and life-threatening flooding over large
portions of southeastern Texas. 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, Harvey is expected to produce total rain accumulations of
5 to 15 inches farther south into the middle Texas coast and farther
east across south-central Louisiana. Rainfall amounts of 5 to 10
inches are expected in southeast Louisiana.
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...
Port Aransas to Morgan City including Galveston Bay...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 in rain bands well
to the east of the center of Harvey, and along the coast to the
southwest of the center. Tropical storm conditions are likely to
persist within the warning area during the next couple of days.
SURF: Swells generated by Harvey are 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 through Tuesday across
southern Louisiana and extreme southeast Texas.
Next complete advisory at 1000 PM CDT.