Harvey Bearing Down on Texas Coast; Devastating Flooding Expected for Southeast Texas

Here’s the 4:25 p.m. report on Hurricane Harvey from the National Weather Service covering southeast Texas:

Hurricane Harvey is a category 3 hurricane at this point and has not made landfall as of yet. The latest forecast for Harvey has been changed slightly and the storm’s impact could be felt well into Wednesday across southeast Texas.

The Flash Flood Watch for Brazos County has been extended through Tuesday evening.

 

Here’s the complete report from the National Weather Service:

flooding

Hurricane Harvey Local Statement Advisory Number 22
National Weather Service Houston/Galveston TX AL092017
425 PM CDT Fri Aug 25 2017

This product covers Southeast Texas

**MAJOR HURRICANE HARVEY BEARING DOWN ON THE TEXAS COAST**
**DEVASTATING FLOODING EXPECTED FOR SOUTHEAST TEXAS***

NEW INFORMATION
—————

* CHANGES TO WATCHES AND WARNINGS:
– None

* CURRENT WATCHES AND WARNINGS:
– A Tropical Storm Warning and Storm Surge Watch are in effect
for Chambers and Harris
– A Tropical Storm Warning is in effect for Austin, Colorado,
Fort Bend, Liberty, Waller, and Wharton
– A Storm Surge Warning and Hurricane Warning are in effect for
Jackson and Matagorda
– A Storm Surge Warning and Tropical Storm Warning are in effect
for Brazoria and Galveston

* STORM INFORMATION:
– About 160 miles southwest of Galveston TX or about 60 miles
south of Port O`Connor TX
– 27.5N 96.5W
– Storm Intensity 125 mph
– Movement Northwest or 325 degrees at 10 mph

SITUATION OVERVIEW
——————

Harvey continues to move northwest this afternoon and has become a
category 3 hurricane with maximum sustained winds of 125 mph. Harvey
should make landfall along the middle Texas coast early tonight. The
primary impact from Harvey over Southeast Texas remains prolonged
significant heavy rainfall that will induce extreme widespread
flooding through at least the beginning of next week. Tropical storm
force winds, with occasional hurricane force wind gusts, and storm
surge will occur along the coast as early as this afternoon and
persist through Tuesday. Coastal flooding due to storm surge and wave
run up will remain an issue throughout the weekend and into the
beginning of next week as strong onshore winds will continue to pile
water up along the coastline. Again, the primary emphasis and greatest
threat to life and property will be the extreme rainfall amounts that
will likely lead to a potentially catastrophic and prolonged flash
flooding event.

POTENTIAL IMPACTS
—————–

* FLOODING RAIN:
Protect against life-threatening rainfall flooding having possible
devastating impacts across the southern half of Southeast Texas.
Potential impacts include:
– Extreme rainfall flooding may prompt numerous evacuations and
rescues.
– Rivers and tributaries may overwhelmingly overflow their banks
in many places with deep moving water. Small streams, creeks,
canals, and ditches may become raging rivers. Flood control
systems and barriers may become stressed.
– Flood waters can enter numerous structures within multiple
communities, some structures becoming uninhabitable or washed
away. Numerous places where flood waters may cover escape
routes. Streets and parking lots become rivers of raging water
with underpasses submerged. Driving conditions become very
dangerous. Numerous road and bridge closures with some weakened
or washed out.

Protect against life-threatening rainfall flooding having possible
limited to extensive impacts across the northern half of Southeast
Texas.

* WIND:
Protect against life-threatening wind having possible devastating
impacts across Matagorda Bay. Potential impacts in
this area include:
– Structural damage to sturdy buildings, some with complete roof
and wall failures. Complete destruction of mobile homes. Damage
greatly accentuated by large airborne projectiles. Locations
may be uninhabitable for weeks or months.
– Numerous large trees snapped or uprooted along with fences and
roadway signs blown over.
– Many roads impassable from large debris, and more within urban
or heavily wooded places. Many bridges, causeways, and access
routes impassable.
– Widespread power and communications outages.

* SURGE:
Protect against life-threatening surge having possible devastating
impacts through Matagorda Bay. Potential impacts in
this area include:
– Widespread deep inundation, with storm surge flooding greatly
accentuated by powerful battering waves. Structural damage to
buildings, with many washing away. Damage greatly compounded
from considerable floating debris. Locations may be
uninhabitable for an extended period.
– Near-shore escape routes and secondary roads washed out or
severely flooded. Flood control systems and barriers may become
stressed.
– Extreme beach erosion. New shoreline cuts possible.
– Massive damage to marinas, docks, boardwalks, and piers.
Numerous small craft broken away from moorings with many lifted
onshore and stranded.

Also, protect against life-threatening surge having possible
significant to extensive impacts across the Upper Texas Coast from Port
O`Connor to San Luis Pass.

Also, protect against locally hazardous surge having possible limited
impacts across Galveston Island, Bolivar Peninsula and Galveston Bay.

Elsewhere across Southeast Texas, little to no impact is anticipated.

* TORNADOES:
Protect against a tornado event having possible limited impacts
across Southeast Texas. 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.

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

* EVACUATIONS:
WATCH/WARNING PHASE – For those under evacuation orders, leave as
soon as practical with a destination in mind. Gas up your vehicle
well ahead of time. Be sure that you take all essential materials
from your emergency supplies kit. Let others know where you are going
and when you intend to arrive.

WATCH/WARNING PHASE – If evacuating the area, stick to prescribed
evacuation routes. Look for additional traffic information on roadway
smart signs and listen to select radio channels for further travel
instructions. Drivers should not use cell phones while operating
vehicles.

WATCH/WARNING PHASE – For those not under evacuation orders,
understand that there are inherent risks to evacuation (such as
traffic congestion, accidents, and driving in bad weather), so
evacuate only if necessary. Help keep roadways open for those that
are under evacuation orders.

WATCH/WARNING PHASE – If you are exceptionally vulnerable to wind or
water hazards from tropical systems, consider voluntary evacuation,
especially if being officially recommended. Relocate to a
predetermined shelter or safe destination.

WATCH/WARNING PHASE – If evacuating away from the area or relocating
to a nearby shelter, leave early before weather conditions become
hazardous.

* OTHER PREPAREDNESS INFORMATION:

Outside preparations should be wrapped up as soon as possible before
weather conditions completely deteriorate. Any remaining evacuations
and relocations should be expedited before the onset of tropical
storm force wind.

If you are relocating to safe shelter, leave as early as possible. If
heading to a community shelter, become familiar with the shelter
rules before arrival, especially if you have special needs or own a
pet. Take essential items with you from your Emergency Supplies Kit.
Check the latest weather forecast before departing.

Failure to adequately shelter may result in serious injury or loss of
life. Always heed the advice of local officials and comply with any
orders that are issued. Remember, during the storm 9 1 1 Emergency
Services may not be able to immediately respond if conditions are
unsafe. This should be a big factor in your decision making.

Check-in with your emergency points of contact among family, friends,
and workmates. Inform them of your status and well-being. Let them
know how you intend to ride out the storm and when you plan to
check-in again.

Keep cell phones well charged and handy. Also, cell phone chargers
for automobiles can be helpful after the storm. Locate your chargers
and keep them with your cell phone.

In emergencies it is best to remain calm. Stay informed and focused
on the situation at hand. Exercise patience with those you encounter.
Be a Good Samaritan and helpful to others.

If relocating to a nearby shelter or to the home of a family member
or friend, drive with extra caution, especially on secondary roads.
Remember, many bridges and causeways will be closed once higher winds
arrive. Also, if you encounter water covering the road, seek an
alternate route. Always obey official road signs for closures and
detours.

If you are a visitor and still in the area, listen for the name of
the city or town in which you are staying within local news updates.
Be sure you know the name of the county or parish in which it
resides. Pay attention for instructions from local authorities.

Closely monitor NOAA Weather radio or other local news outlets for
official storm information. Be ready to adapt to 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 Houston/Galveston TX around 7 PM CDT, or sooner if
conditions warrant.