ZCZC MIATCPAT4 ALL
TTAA00 KNHC DDHHMM
Tropical Storm Harvey Intermediate Advisory Number 28A
NWS National Hurricane Center Miami FL AL092017
700 AM CDT Sun Aug 27 2017
...HARVEY PRODUCING CATASTROPHIC AND LIFE-THREATENING FLOODING...
...FLASH FLOOD EMERGENCIES IN EFFECT FOR PORTIONS OF SOUTHEASTERN
SUMMARY OF 700 AM CDT...1200 UTC...INFORMATION
ABOUT 45 MI...70 KM WNW OF VICTORIA TEXAS
ABOUT 65 MI...105 KM ESE OF SAN ANTONIO TEXAS
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...SSE OR 160 DEGREES AT 1 MPH...2 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Warning is in effect for...
* Port O'Connor to Sargent Texas
A Tropical Storm Warning is in effect for...
* Port O'Connor to Sargent 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 700 AM CDT (1200 UTC), the center of Tropical Storm Harvey was
located near latitude 29.0 North, longitude 97.6 West. Harvey is
moving toward the south-southeast near 1 mph (2 km/h), and a
slow southeastward to east-southeastward motion is expected over the
next couple of days. On the forecast track, the center will remain
inland or move very near the coast of southeastern Texas through
Maximum sustained winds are near 45 mph (75 km/h) with higher
gusts. Some weakening is forecast during the next 48 hours, and
Harvey is likely to become a tropical depression by tonight.
Tropical-storm-force winds extend outward up to 60 miles (95 km)
from the center. An NOS site near the entrance to Matagorda Bay
recently reported sustained winds of 40 mph (65 km/h) with a gust to
53 mph (85 km/h).
The estimated minimum central pressure is 998 mb (29.47 inches).
HAZARDS AFFECTING LAND
RAINFALL: Harvey is expected to produce additional rain
accumulations of 15 to 25 inches over the middle and upper Texas
coast through Thursday. Isolated storm totals may reach around
40 inches in this area. These rains are currently producing
catastrophic and life-threatening flooding, and flash flood
emergencies are in effect for portions of southeastern Texas.
Please see warnings and products issued by your local National
Weather Service office for additional information on this
Elsewhere during the same time period, Harvey is expected to produce
total rain accumulations of 5 to 15 inches farther south toward the
lower Texas coast, farther west toward the Texas Hill Country, and
farther east through southwest and central Louisiana. 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 Port O'Connor...1 to 3 ft
Port O'Connor to Sargent...2 to 4 ft
Sargent to High Island including Galveston Bay...1 to 3 ft
High Island to Morgan City...1 to 2 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 an area near the
center and over portions of the tropical storm warning area along
the coast. These conditions are likely to persist through this
SURF: Swells generated by Harvey affecting the coasts of Texas
and Louisiana should subside through this morning. 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 and tonight near
the middle and upper Texas coast into far southwest Louisiana.
Next complete advisory at 1000 AM CDT.