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Tropical Depression Harvey Local Statement from 8/23/2017 12:47 PM to 9:00 PM CDT for DeWitt County, Lavaca County, Wilson County:

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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**
 
NEW INFORMATION
—————
 
* 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
 
SITUATION OVERVIEW
——————
 
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.
 
POTENTIAL IMPACTS
—————–
 
* FLOODING RAIN:
Prepare for locally hazardous rainfall flooding having possible limited
impacts across areas in the Tropical Storm Watch. Potential impacts
include:
– 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
closures.
 
Elsewhere across SOUTH CENTRAL TEXAS, little to no impact is
anticipated.
 
* WIND:
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
routes impassable.
– Scattered power and communications outages, but more prevalent
in areas with above ground lines.
 
* TORNADOES:
There is a low risk for tornadoes late Friday east of Interstate 35.
 
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 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
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 5 PM CDT, or sooner if
conditions warrant.

TS Harvey Update from NWS Austin-San Antonio includes information for DE WITT, FAYETTE, GONZALES, and LAVACA Counties.

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Headline:

…Tropical Storm Watches in effect for southeast portions of South Central Texas…

…Tropical Storm Watches in effect for….Fayette, Gonzales, Wilson, Karnes, DeWitt, and Lavaca Counties…

Area of Concern:

Primarily areas east of Interstate 37 and east of Interstate 35.  This includes the following counties of… Fayette, Gonzales, Wilson, Karnes, DeWitt, and Lavaca.

Word of caution…While the areas listed above will likely see the biggest impacts (Wind and Rain) from Harvey, small changes in the track/intensity, may push the impacts and tropical watches/warnings farther west to possibly include the I-35 corridor and the Austin-San Antonio metro areas.

Threats & Impacts:

Note…a change in track and intensity may dramatically change the impacts and locations of these threats/impacts. 

Rainfall:  3-6 inches of rain east of Interstate 35 with isolated totals that may exceed 10 inches in the Tropical Storm Watch areas especially across the far eastern areas.  Areas along and west of I-35 could see 1-3 inches.   Flash Flooding and River Flooding is possible mainly across the Tropical Storm Watch area.

Winds:  Tropical storm force winds of 40 to 50 mph are possible across the Watch area, with gusts that could exceed 60 mph.  Areas to the west along the I-35 corridor may experience some low end tropical storm force wind gusts if bands push farther west.

Tornadoes:  There may be a slight risk of tornadoes mainly along rain bands in the front right quadrant of landfall. These small tornadoes can happen day or night.

Timing and Overview:

Overview:

The remnants of Harvey have reformed into a tropical depression just west of the Yucatan in the Bay of Campeche.  Over the next couple of days Harvey is expected to strengthen into a strong Tropical Storm and make landfall along the middle Texas coast.  On the current forecast track, tropical storm force winds are expected to affect southeast sections of South Central Texas on Friday and Saturday and have thus issued Tropical Storm Watches for this area (see County list above).  As with any tropical system, flooding rainfall and strong winds will be the primary threat.

There remains uncertainty on exactly where the system could impact along the Texas coast and locations inland. As such please know that later updates may change the impact areas and threats.  The system is forecast to move very slowly over SE Texas over the weekend.

It should be stressed that there is the potential for much higher rainfall amounts across South Central Texas if the center of system ends up tracking farther west and much lower amounts if the center of the system tracks toward the Upper Texas Coast.

At this time we urge you to remain closely aware of the changes to the forecast over the next 24-48 hours by monitoring the National Hurricane Center (www.hurricanes.gov) and your local forecast (www.weather.gov/sanantonio).  As this system We expect greater detail and confidence in the forecast tomorrow.

Confidence:

Moderate for location and impacts of Harvey.

Additional Information Resources:


Sincerely,

Paul Yura
NWS Austin / San Antonio

TS Harvey Update from NWS Corpus Christi includes information for CALHOUN, GOLIAD, and VICTORIA Counties, VICTORIA CROSSROADS, COASTAL BEND, and BRUSH COUNTRY.

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Here is the latest information as of 10 AM concerning Tropical Depression Harvey

Summary of 10 AM Information

Hurricane Watch in effect from Port Mansfield to San Luis Pass including Corpus Christi and surrounding areas

Storm Surge Watch in effect from Port Mansfield to High Island including Corpus Christi and surrounding areas

Location: 21.5 N  92.5 W or 535 Miles SSE of Port O’Conner TX

Maximum Sustained Winds: 35 mph
Present Movement:  NW at 9 mph
Minimum Central Pressure:  1006 mb

Additional Information Resources:

National Hurricane Center:
  www.hurricanes.gov
NWS Corpus Christi:  www.weather.gov/corpuschristi

New Local Tropical Webpage:  http://www.weather.gov/srh/tropical?office=crp

Sincerely,
John
NWS Corpus Christi, TX

TS Harvey Update from NWS Houston-Galveston includes information for COLORADO, JACKSON, and WHARTON Counties.

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Hurricane, Tropical Storm and Storm Surge watches have been issued for portions of the area. Expecting heavy rain and flooding potential as well. See attached for more details. Also more detailed storm surge information will follow. Next update at 415 pm.

Dan Reilly

Warning Coordination Meteorologist

National Weather Service Houston/Galveston

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