[Tropical] Hurricane Local Statement

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Tropical Storm Hanna Local Statement Advisory Number 15
National Weather Service Brownsville TX  AL082020
1101 AM CDT Sun Jul 26 2020

This product covers The Rio Grande Valley and Deep South Texas

**HANNA CONTINUES TO WEAKEN OVER MEXICO**
**DANGEROUS TO CATASTROPHIC FLASH FLOODING CONTINUES**

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

* CHANGES TO WATCHES AND WARNINGS:
    - The Tropical Storm Warning has been cancelled for Brooks,
      Coastal Cameron, Coastal Kenedy, Coastal Willacy, Inland
      Kenedy, and Jim Hogg

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Warning is in effect for Inland Cameron,
      Inland Willacy, Northern Hidalgo, Southern Hidalgo, Starr, and
      Zapata

* STORM INFORMATION:
    - About 140 miles west of Brownsville TX
    - 26.1N 99.7W
    - Storm Intensity 45 mph
    - Movement West-southwest or 250 degrees at 9 mph

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

The potential for catastrophic life threatening flooding continues to
be the main threat as Tropical Storm Hanna continues to move steadily
southwest into Mexico. Additional rainfall amounts of 2 to 5 inches are
expected today which will produce total rainfall amounts of 6 to 12
inches, locally up to 18 inches. Hanna's weakening trend will continue
as the system advances into northern Mexico and will be expected to
become a Tropical Depression later today or tonight. In addition to the
flooding, tropical storm force winds continue with heavier rainbands
which may impact the Rio Grande Valley and Zapata county. Winds along
the coast and offshore have diminished and tropical storm warnings have
been lowered. Stronger and gusty winds could result in additional
power outages. With the southerly fetch, minor coastal flooding could
be possible along the lower Texas coast, including on either side of
South Padre Island. Lastly, conditions do remain favorable for the
threat of isolated tornadoes within any rainbands associated with the
tropical cyclone.

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

* FLOODING RAIN:
Potential impacts from the flooding rain are still unfolding across
The Rio Grande Valley and Deep South Texas. Remain well guarded against
life-threatening flood waters having additional devastating impacts.

 If realized, these 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, arroyos, and ditches may become raging rivers. In
      mountain areas, deadly runoff may rage down valleys while
      increasing susceptibility to rockslides and mudslides. 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.



* WIND:
Potential impacts from the main wind event are now unfolding across the
Upper Rio Grande Valley. Remain well sheltered from dangerous wind
having additional significant impacts.

If realized, these impacts 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.

Potential impacts from the main wind event are also now unfolding
across the rest of Deep South Texas and the Rio Grande Valley. Remain
well sheltered from hazardous wind having additional limited impacts.

* TORNADOES:
Potential impacts from tornadoes are still unfolding across The Rio
Grande Valley and Deep South Texas. Remain well braced against a
tornado event having additional limited impacts.

If realized, these 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.

* SURGE:
Potential impacts from the main surge event are now unfolding across
the lower Texas coast. Remain well away from locally hazardous surge
having additional limited impacts.

 If realized, these impacts include:
    - Localized inundation with storm surge flooding mainly along
      immediate shorelines and in low-lying spots, or in areas
      farther inland near where higher surge waters move ashore.
    - Sections of near-shore roads and parking lots become overspread
      with surge water. Driving conditions dangerous in places where
      surge water covers the road.
    - Moderate beach erosion. Heavy surf also breaching dunes, mainly
      in usually vulnerable locations. Strong rip currents.
    - Minor to locally moderate damage to marinas, docks, boardwalks,
      and piers. A few small craft broken away from moorings.

Elsewhere across The Rio Grande Valley and Deep South Texas, little
to no impact is anticipated.

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

* EVACUATIONS:
Do not enter evacuated areas until officials have given the all clear
to return.

* OTHER PREPAREDNESS INFORMATION:
Now is the time to stay inside and away from windows. Listen for
updates and be ready in case you lose electrical power. Keep a battery-
powered radio, charged cell phone and flashlight handy.

During the peak of the storm be ready to move quickly. Keep your
shoes on and rain gear handy. Boots and athletic shoes offer the best
foot protection if you become unexpectedly exposed to the weather.

Quickly move to the safest place within your shelter if it begins to
fail, preferably an interior room on the lowest floor as long as
flooding is not a concern.

If you are prone to flooding or in an area under a storm surge watch
or warning, be prepared for the possibility of a quick and dramatic
rise in water levels.

If a tornado warning is issued for your area, quickly move to the
safest place within your shelter. Protect your head and body.


* 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 Brownsville TX around 400 PM CDT, or sooner if conditions
warrant.

$$
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