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Tropical Storm Harvey Intermediate Advisory Number 25A
NWS National Hurricane Center Miami FL AL092017
100 PM CDT Sat Aug 26 2017
...HARVEY BECOMES A TROPICAL STORM INLAND OVER TEXAS...
...EXTREMELY SERIOUS FLOODING EVENT UNFOLDING...
SUMMARY OF 100 PM CDT...1800 UTC...INFORMATION
ABOUT 45 MI...70 KM WNW OF VICTORIA TEXAS
ABOUT 60 MI...95 KM ESE OF SAN ANTONIO TEXAS
MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H
PRESENT MOVEMENT...NNW OR 340 DEGREES AT 2 MPH...4 KM/H
MINIMUM CENTRAL PRESSURE...987 MB...29.15 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* Port Aransas to High Island Texas
A Tropical Storm Warning is in effect for...
* Baffin Bay to High Island Texas
A Storm Surge Warning means there is a danger of life-threatening
inundation from rising water moving inland from the coastline 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.
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 by National Weather Service Doppler radar near latitude 29.1
North, longitude 97.6 West. Harvey is moving slowly toward the
north-northwest near 2 mph (4 km/h), and little motion is
anticipated during the next several days.
Maximum sustained winds have decreased to near 70 mph (110 km/h)
with higher gusts. Additional weakening is forecast during the next
Tropical-storm-force winds extend outward up to 140 miles (220 km).
The estimated minimum central pressure is 987 mb (29.15 inches).
HAZARDS AFFECTING LAND
RAINFALL: Harvey is expected to produce total rain accumulations of
15 to 30 inches and isolated maximum amounts of 40 inches over the
middle and upper Texas coast through Thursday. During the same
time period Harvey is expected to produce total rain accumulations
of 5 to 15 inches in far south Texas, the Texas Hill Country
and southwest and central Louisiana. Rainfall of this magnitude
will cause catastrophic and life-threatening flooding. A list of
rainfall observations compiled by the NOAA Weather Prediction Center
can be found at: www.wpc.ncep.noaa.gov/discussions/nfdscc1.html
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 Sargent...4 to 7 ft
Sargent to High Island including Galveston Bay...2 to 4 ft
High Island to Morgan City...1 to 3 ft
The deepest water will occur along the immediate coast near the
area of onshore winds, 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: Tropical storm conditions are occurring in portions of
the tropical storm warning area, and are likely to persist along
portions of the coast through at least Sunday.
SURF: Swells generated by Harvey are affecting the Texas,
Louisiana, and northeast Mexico coasts. These swells are likely to
cause life-threatening surf and rip current conditions. Please
consult products from your local weather office.
TORNADOES: Tornadoes are possible today and tonight near the middle
and upper Texas coast into far southwest Louisiana.
Next complete advisory at 400 PM CDT.