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Tropical Storm Harvey Intermediate Advisory Number 15A
NWS National Hurricane Center Miami FL       AL092017
700 AM CDT Thu Aug 24 2017

...AIR FORCE HURRICANE HUNTER PLANE FINDS HARVEY STRENGTHENING...


SUMMARY OF 700 AM CDT...1200 UTC...INFORMATION
----------------------------------------------
LOCATION...23.8N 93.0W
ABOUT 380 MI...615 KM SE OF PORT OCONNOR TEXAS
ABOUT 335 MI...540 KM SE OF PORT MANSFIELD TEXAS
MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
PRESENT MOVEMENT...NNW OR 345 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...986 MB...29.12 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for...
* Port Mansfield to San Luis Pass Texas

A Storm Surge Watch is in effect for...
* South of Port Mansfield Texas to the Mouth of the Rio Grande
* North of San Luis Pass to High Island Texas

A Hurricane Warning is in effect for...
* Port Mansfield to Matagorda Texas

A Tropical Storm Warning is in effect for...
* North of Matagorda to High Island Texas
* South of Port Mansfield Texas to the Mouth of the Rio Grande

A Hurricane Watch is in effect for...
* South of Port Mansfield Texas to the Mouth of the Rio Grande

A Tropical Storm Watch is effect for...
* South of the Mouth of the Rio Grande to Boca de Catan Mexico

A Storm Surge Warning means there is a danger of life-threatening
inundation, from rising water moving inland from the coastline,
during the next 36 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.

A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area.  A warning is typically issued
36 hours before the anticipated first occurrence of tropical-storm-
force winds, conditions that make outside preparations difficult or
dangerous.  Preparations to protect life and property should be
rushed to completion.

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.

A Hurricane Watch means that hurricane conditions are possible
within the watch area.

A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area.

In addition, 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
meteorological service.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 700 AM CDT (1200 UTC), the center of Tropical Storm Harvey was
located by a reconnaissance plane near latitude 23.8 North,
longitude 93.0 West. Harvey is moving toward the north-northwest
near 10 mph (17 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 will approach the southern
Texas coast on Friday.

An Air Force Reserve aircraft reports that the maximum sustained
winds have increased to near 60 mph (95 km/h) with higher gusts.
Additional strengthening is forecast during the next 48 hours, and
Harvey is expected to become a hurricane by Friday.

Tropical-storm-force winds extend outward up to 115 miles (185 km)
from the center.

The minimum central pressure based on data from the Air Force
Hurricane Hunter aircraft is 986 mb (29.12 inches).


HAZARDS AFFECTING LAND
----------------------
RAINFALL:  Harvey is expected to produce total rain accumulations of
10 to 15 inches with isolated maximum amounts of 25 inches over the
Texas coast through next Wednesday. During the same time period
Harvey is expected to produce total rain accumulations of 3 to 9
inches along its outer radius including parts of south, central, and
eastern Texas and the lower Mississippi Valley. Rainfall from Harvey
may 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 San Luis Pass...5 to 7 ft
San Luis Pass to High Island...2 to 4 ft
Mouth of the Rio Grande to Port Mansfield...2 to 4 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 likely within the hurricane warning
area late Friday or Friday night, with tropical storm conditions
expected to first reach the coast in the hurricane warning area
Friday.

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 ADVISORY
-------------
Next complete advisory at 1000 AM CDT.

$$
Forecaster Berg

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