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Tropical Depression Harvey Intermediate Advisory Number 13A
NWS National Hurricane Center Miami FL AL092017
700 PM CDT Wed Aug 23 2017
...HURRICANE HUNTER AIRCRAFT FINDS THAT HARVEY HAS NOT
SUMMARY OF 700 PM CDT...0000 UTC...INFORMATION
ABOUT 525 MI...845 KM SSE OF PORT OCONNOR TEXAS
ABOUT 460 MI...740 KM SE OF PORT MANSFIELD TEXAS
MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H
PRESENT MOVEMENT...NW OR 320 DEGREES AT 2 MPH...4 KM/H
MINIMUM CENTRAL PRESSURE...1003 MB...29.62 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Watch is in effect for...
* Port Mansfield to High Island
A Hurricane Watch is in effect for...
* North of Port Mansfield to San Luis Pass
A Tropical Storm Watch is in effect for...
* Boca De Catan Mexico to Port Mansfield Texas
* North of San Luis Pass to High Island
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
A Hurricane Watch means that hurricane conditions are possible
within the watch area. A watch is typically issued 48 hours
before the anticipated first occurrence of tropical-storm-force
winds, conditions that make outside preparations difficult or
A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, generally within 48 hours.
Interests in southwestern Louisiana should continue to monitor the
progress of this system.
For storm information specific to your area in the United
States, including possible inland watches and warnings, please
monitor products issued by your local National Weather Service
forecast office. For storm information specific to your area outside
the United States, please monitor products issued by your national
DISCUSSION AND 48-HOUR OUTLOOK
At 700 PM CDT (0000 UTC), the center of Tropical Depression Harvey
was located near latitude 21.7 North, longitude 92.5 West. The
depression is moving erratically toward the northwest near 2 mph (4
km/h). A track toward the northwest or north-northwest at a faster
forward speed is expected for the next 48 hours. On the forecast
track, Harvey should be approaching the Texas coast late Friday.
Reports from an Air Force Reserve Hurricane Hunter aircraft
indicate that maximum sustained winds remain near 35 mph (55 km/h)
with higher gusts. Some strengthening is forecast during the next
48 hours, and Harvey could become a tropical storm later tonight
and a hurricane on Friday.
The minimum central pressure estimated from the Hurricane Hunter
aircraft data and Mexican surface observations is 1003 mb
HAZARDS AFFECTING LAND
RAINFALL: Harvey is expected to produce total rain accumulations of
10 to 15 inches with isolated maximum amounts of 20 inches over the
middle and upper Texas coast and southwest Louisiana through next
Tuesday, with heavy rainfall beginning as early as Friday morning.
Harvey is also expected to produce total rain accumulations of 3 to
9 inches in portions of south, central, and northeast Texas and the
rest of the lower Mississippi Valley. Rainfall from Harvey could
cause life-threatening flooding.
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 Mansfield to High Island...4 to 6 ft
The deepest water will occur along the immediate coast near and to
the northeast of the landfall location, where the surge will be
accompanied by large and destructive 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 possible within the hurricane watch
area by late Friday, with tropical storm conditions possible by
SURF: Swells generated by Harvey are likely to affect the Texas,
Louisiana, and northeast Mexico coasts by Friday. These swells are
likely to cause life-threatening surf and rip current conditions.
Please consult products from your local weather office.
Next complete advisory at 1000 PM CDT.