[Tropical] Hurricane Local Statement

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WTCA82 TJSJ 300946
HLSSJU
PRZ001>013-VIZ001-002-301800-

Tropical Storm Isaias Local Statement Advisory Number 8
National Weather Service San Juan PR  AL092020
546 AM AST Thu Jul 30 2020

This product covers Puerto Rico and the US Virgin Islands

**Rainbands are Producing Flooding in Puerto Rico from TC Isaias**

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

* CHANGES TO WATCHES AND WARNINGS:
    - None

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Warning is in effect for Central Interior,
      Culebra, Eastern Interior, Mayaguez and Vicinity, North
      Central, Northeast, Northwest, Ponce and Vicinity, San Juan and
      Vicinity, Southeast, Southwest, St Croix, St.Thomas...St.
      John...and Adjacent Islands, Vieques, and Western Interior

* STORM INFORMATION:
    - About 150 miles southwest of San Juan PR or about 90 miles
      southwest of Mayaguez PR
    - 17.2N 67.9W
    - Storm Intensity 60 mph
    - Movement Northwest or 305 degrees at 21 mph

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

A Tropical Storm Warning remains in effect for Puerto Rico and the
U.S. Virgin Islands. Doppler radar and recent surface observations
show rain bands moving through Puerto Rico with heavy rainfall and
wind gusts approaching 50 mph. Latest lightning information shows
thunderstorms in local southern coastal waters. These are likely to
move inland this morning. Rainfall accumulations totals of 1.5-4.0
inches have been observed in the last 3 hours, resulting in excessive
run-off with flooding of streams and poorly drained areas. Increasing
shower and thunderstorm activity and additional rounds of heavy rains
will contribute to a greater potential for life threatening flash
flooding and mudslides, as well as localized river flooding, mainly
across mainland Puerto Rico this morning. Hazardous marine and coastal
conditions will continue as the system streams west-northwestward
across the eastern Caribbean and south of the local islands. These
conditions are forecast to persist through at least Thursday night, but
rainfall should begin to taper off later this afternoon.


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

* FLOODING RAIN:
Protect against life-threatening rainfall flooding having possible
extensive impacts across Puerto Rico and the US Virgin Islands.
Potential impacts include:
    - Major rainfall flooding may prompt many evacuations and rescues.
    - Rivers and tributaries may rapidly overflow their banks in
      multiple places. Small streams, creeks, canals, arroyos, and
      ditches may become dangerous rivers. In mountain areas,
      destructive runoff may run quickly down valleys while
      increasing susceptibility to rockslides and mudslides. Flood
      control systems and barriers may become stressed.
    - Flood waters can enter many structures within multiple
      communities, some structures becoming uninhabitable or washed
      away. Many places where flood waters may cover escape routes.
      Streets and parking lots become rivers of moving water with
      underpasses submerged. Driving conditions become dangerous.
      Many road and bridge closures with some weakened or washed out.

* WIND:
Protect against dangerous wind having possible significant impacts
across Puerto Rico and the U.S. Virgin Islands. 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.

Also, protect against hazardous wind having possible limited impacts
across Puerto Rico and the U.S. Virgin Islands.

* SURGE:
Little to no impacts are anticipated at this time across Puerto Rico
and the US Virgin Islands.

* TORNADOES:
Protect against a tornado event having possible limited impacts
across Puerto Rico and the US Virgin Islands. 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:
Do not return to evacuated areas until hazardous winds diminish and
flood waters abate.


* 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 San Juan PR around 8 AM AST, or sooner if conditions
warrant.

$$
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