Harvey to bring Heavy Rainfall and Tropical Storm Force Winds to South Central Texas.
Intermediate Advisory Number 12A
National Weather Service Austin/San Antonio TX AL092017
1247 PM CDT Wed Aug 23 2017
This product covers SOUTH CENTRAL TEXAS
**Harvey to bring Heavy Rainfall and Tropical Storm Force Winds to
South Central Texas**
* CHANGES TO WATCHES AND WARNINGS:
– A Tropical Storm Watch has been issued for De Witt, Fayette,
Gonzales, Karnes, Lavaca, and Wilson
* CURRENT WATCHES AND WARNINGS:
– A Tropical Storm Watch is in effect for De Witt, Fayette,
Gonzales, Karnes, Lavaca, and Wilson
* STORM INFORMATION:
– About 610 miles south-southeast of Hallettsville TX or about
640 miles south-southeast of La Grange TX or about 600 miles
south-southeast of Cuero TX
– 21.5N 92.5W
– Storm Intensity 35 mph
– Movement Stationary
Harvey regenerates into a tropical depression across the Gulf of
Mexico waters. Harvey is expected to move to the northwest and approach
the Texas coast Friday. The tropical system will bring tropical storm
winds and heavy rain across South Central Texas beggining Friday and
continuing into the weekend. Flash flooding and river flooding is
possible, mainly across the Tropical Storm Watch area.
Storm Total rainfall amounts of 3 to 6 inches are expected east of
Interstate 35 with isolated 10 inches across counties in the Tropical
Storm Watch from Friday afternoon through Monday afternoon. It should
be stressed that there is the potential for much higher amounts across
South Central Texas as they will be highly dependent on the track and
intensity of Harvey.
There is a low risk of brief tornadoes east of Interstate 35 Friday
evening into the weekend associated with tropical rain bands.
* FLOODING RAIN:
Prepare for locally hazardous rainfall flooding having possible limited
impacts across areas in the Tropical Storm Watch. Potential impacts
– Localized rainfall flooding may prompt a few evacuations.
– Rivers and tributaries may quickly rise with swifter currents.
Small streams, creeks, canals, arroyos, and ditches may become
swollen and overflow in spots.
– Flood waters can enter a few structures, especially in usually
vulnerable spots. A few places where rapid ponding of water
occurs at underpasses, low-lying spots, and poor drainage
areas. Several storm drains and retention ponds become
near-full and begin to overflow. Some brief road and bridge
Elsewhere across SOUTH CENTRAL TEXAS, little to no impact is
Prepare for dangerous wind having possible significant impacts across
the Tropical Storm Watch 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
– Scattered power and communications outages, but more prevalent
in areas with above ground lines.
There is a low risk for tornadoes late Friday east of Interstate 35.
* 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 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.
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
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
* 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
The next local statement will be issued by the National Weather
Service in Austin/San Antonio TX around 5 PM CDT, or sooner if