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Tropical Storm Harvey Intermediate Advisory Number 37A
NWS National Hurricane Center Miami FL AL092017
100 PM CDT Tue Aug 29 2017
...HARVEY CONTINUES TO DUMP CATASTROPHIC RAINS OVER
SOUTHEASTERN TEXAS AND SOUTHWESTERN LOUISIANA...
SUMMARY OF 100 PM CDT...1800 UTC...INFORMATION
ABOUT 80 MI...130 KM SSW OF PORT ARTHUR TEXAS
ABOUT 95 MI...155 KM SW OF CAMERON LOUISIANA
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...NNE OR 20 DEGREES AT 8 MPH...13 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...
* North of Port O'Connor to Morgan City Louisiana
A Tropical Storm Watch is in effect for...
* East of Morgan City to Grand Isle
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 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
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 28.8 North, longitude 94.3 West. Harvey is
moving a little faster toward the north-northeast near 8 mph (13
km/h), and this general motion is expected to continue today and
tomorrow. On the forecast track, the center of Harvey is expected to
move inland over the northwestern Gulf within the tropical storm
warning area later tonight or early Wednesday.
Maximum sustained winds remain near 45 mph (75 km/h) with higher
gusts. An Air Force plane is currently approaching the center of
No significant change in strength is expected before the center
moves inland. A gradual weakening should begin thereafter.
Tropical-storm-force winds extend outward up to 160 miles (260 km)
mainly to the east of the center.
The estimated minimum central pressure is 997 mb (29.44 inches).
HAZARDS AFFECTING LAND
RAINFALL: Harvey is expected to produce additional rainfall
accumulations of 6 to 12 inches through Friday 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 and southwestern Louisiana. 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, Harvey is expected to produce additional rainfall amounts
of 5 to 10 inches across portions of southern Louisiana into coastal
Mississippi and Alabama. Rainfall associated with Harvey will spread
north by mid to late week, with rainfall amounts of 4 to 8 inches
spreading into portions of Arkansas and the Tennessee Valley.
A preliminary report from one Texas rain gauge has broken the Texas
tropical cyclone rainfall record. Southeast of Houston, Mary's Creek
at Winding Road reported 49.32 inches as of 9 am CDT. This total is
higher than the previous record of 48 inches set during tropical
cyclone Amelia of 1978 at Medina, Texas.
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...
San Luis Pass 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 over portions of
the warning area along the coast and are likely to persist
during the next day or so. Tropical storms conditions are
possible within the watch area within the next 24 hours.
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 from extreme
southeast Texas across parts of southern Louisiana, coastal
Mississippi and coastal Alabama.
Next complete advisory at 400 PM CDT.