[Tropical] Hurricane Local Statement

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Tropical Storm Harvey Local Statement Advisory Number 15
National Weather Service Austin/San Antonio TX  AL092017
428 AM CDT Thu Aug 24 2017

This product covers SOUTH CENTRAL TEXAS

 **Harvey to Bring Significant Heavy Rainfall and Tropical Storm Force
  Winds to South Central Texas**

NEW INFORMATION
---------------

* CHANGES TO WATCHES AND WARNINGS:
    - The Tropical Storm Watch has been cancelled for Fayette
    - The Tropical Storm Watch has been upgraded to a Tropical Storm
      Warning for De Witt, Gonzales, Karnes, Lavaca, and Wilson
    - A Tropical Storm Warning has been issued for Atascosa

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Warning is in effect for Atascosa, De Witt,
      Gonzales, Karnes, Lavaca, and Wilson

* STORM INFORMATION:
    - About 580 miles south-southeast of Austin TX or about 560 miles
      southeast of San Antonio TX
    - 23.2N 92.8W
    - Storm Intensity 45 mph
    - Movement North or 360 degrees at 10 mph

SITUATION OVERVIEW
------------------

The National Hurricane Center has upgraded Harvey to a Tropical Storm
as of the 1AM update. Harvey is moving slowly northwest in the Gulf of
Mexico. Harvey is expected to continue northwest and approach the
middle Texas coast late Thursday into Friday, although significant
uncertainty continues with the track this system may take. However,
confidence continues to increase for tropical storm winds and a
significant heavy rainfall event across South Central Texas beginning
Friday afternoon and continuing through the weekend. Flash flooding and
river flooding continue to be the main concerns, mainly within the
Tropical Storm Warning and Flash Flood Watch areas.

Storm total rainfall amounts from Friday through Monday afternoon
could be in the 8 to 15 inch range east of Interstate 35 with isolated
totals in excess of 20 inches possible over areas south of Interstate
10 as Harvey is expected to stall over the area.

Additionally, tropical storm force winds from 40 to 50 mph with some
gusts in excess of 60 mph are possible beginning late Friday night or
Saturday morning with the best chances of the higher winds being along
the Coastal Plains. There is a low risk of brief tornadoes east of
Interstate 35 and south of Interstate 10 Friday evening into the
weekend associated with tropical rain bands.

POTENTIAL IMPACTS
-----------------

* FLOODING RAIN:
Protect against dangerous rainfall flooding having possible significant
impacts across areas east of Interstate 35 and south of Interstate 10.
Potential impacts include:
    - Moderate rainfall flooding may prompt several evacuations and
      rescues.
    - Rivers and tributaries may quickly become swollen with swifter
      currents and overspill their banks in a few places, especially
      in usually vulnerable spots. Small streams, creeks, canals,
      arroyos, and ditches overflow.
    - Flood waters can enter some structures or weaken foundations.
      Several places may experience expanded areas of rapid
      inundation at underpasses, low-lying spots, and poor drainage
      areas. Some streets and parking lots take on moving water as
      storm drains and retention ponds overflow. Driving conditions
      become hazardous. Some road and bridge closures.

Protect against locally hazardous rainfall flooding having possible
limited impacts across South-Central Texas

* WIND:
Protect against dangerous wind having possible significant impacts
across the Tropical Storm Warning Area. Potential impacts in this area
include:
    - Some damage to roofing and siding materials, along with damage
      to porches, awnings, carports, and sheds. A few buildings
      experiencing window, door, and garage door failures. Mobile
      homes damaged, especially if unanchored. Unsecured lightweight
      objects become dangerous projectiles.
    - Several large trees snapped or uprooted, but with greater
      numbers in places where trees are shallow rooted. Several
      fences and roadway signs blown over.
    - Some roads impassable from large debris, and more within urban
      or heavily wooded places. A few bridges, causeways, and access
      routes impassable.
    - Scattered power and communications outages, but more prevalent
      in areas with above ground lines.

* TORNADOES:
Protect against a tornado event having possible limited impacts across
east of I-35 and south of I-10. Potential impacts include:
    - The occurrence of isolated tornadoes can hinder the execution
      of emergency plans during tropical events.
    - A few places may experience tornado damage, along with power
      and communications disruptions.
    - Locations could realize roofs peeled off buildings, chimneys
      toppled, mobile homes pushed off foundations or overturned,
      large tree tops and branches snapped off, shallow-rooted trees
      knocked over, moving vehicles blown off roads, and small boats
      pulled from moorings.

Elsewhere across SOUTH CENTRAL TEXAS, little to no impact is
anticipated.

PRECAUTIONARY/PREPAREDNESS ACTIONS
----------------------------------

* OTHER PREPAREDNESS INFORMATION:
Now is the time to check your emergency plan and take necessary actions
to secure your home or business. Deliberate efforts should be underway
to protect life and property. Ensure that your Emergency Supplies Kit
is stocked and ready.

If you live in a place particularly vulnerable to flooding, such as
near the ocean or a large inland lake, in a low lying or poor
drainage area, in a valley or canyon, or near an already swollen
river, plan to move to safe shelter on higher ground.

If you live in a place that is particularly vulnerable to high wind,
such as a mobile home, an upper floor of a high rise building, or on
a boat, plan to move to safe shelter. Take enough supplies for you
and your family for several days.

Be a Good Samaritan and check on those who may not be fully aware of
the situation or who are unable to make personal preparations.

Closely monitor NOAA Weather Radio or other local news outlets for
official storm information. Listen for possible changes to the
forecast.

* ADDITIONAL SOURCES OF INFORMATION:
- For information on appropriate preparations see ready.gov
- For information on creating an emergency plan see getagameplan.org
- For additional disaster preparedness information see redcross.org

NEXT UPDATE
-----------

The next local statement will be issued by the National Weather
Service in Austin/San Antonio TX around 11 AM CDT, or sooner if
conditions warrant.

$$
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