[Tropical] Hurricane Local Statement

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Tropical Storm Isaias Local Statement Intermediate Advisory Number 26A
National Weather Service Baltimore MD/Washington DC  AL092020
239 PM EDT Mon Aug 3 2020

This product covers Eastern West Virginia, Central and Western Maryland,
Northern and Northwestern Virginia, and District of Columbia

**STRONG WINDS AND FLOODING RAINFALL LIKELY TONIGHT AND TUESDAY**

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

* CHANGES TO WATCHES AND WARNINGS:
    - None

* CURRENT WATCHES AND WARNINGS:
    - A Tropical Storm Warning is in effect for Anne Arundel,
      Arlington/Falls Church/Alexandria, Calvert, Carroll, Central
      and Southeast Howard, Central and Southeast Montgomery,
      Charles, District of Columbia, Fairfax, King George, Northern
      Baltimore, Northwest Harford, Northwest Howard, Northwest
      Montgomery, Prince Georges, Prince William/Manassas/Manassas
      Park, Southeast Harford, Southern Baltimore, Spotsylvania, St.
      Marys, and Stafford

* STORM INFORMATION:
    - About 560 miles south-southwest of Washington DC or about 590
      miles south-southwest of Baltimore MD
    - 31.2N 80.0W
    - Storm Intensity 70 mph
    - Movement North or 5 degrees at 13 mph

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

Significant flash flooding of small streams and creeks is likely
tonight into Tuesday evening as rainfall associated with Tropical
Storm Isaias spreads northward. Widespread rainfall totals of 3 to
6 inches are expected with locally higher amounts possible. The
highest amounts are expected east of the Blue Ridge Mountains
particularly over the I-95 corridor late tonight through Tuesday.
Tropical storm force winds are expected along and east of the
I-95 Corridor and north central Maryland. Tree damage and power
outages are possible in this area. Moderate coastal flooding is
also possible at times of high tide as Isaias makes its closest
approach to the area and continuing Wednesday morning.

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

* FLOODING RAIN:
Prepare for life-threatening rainfall flooding having possible
extensive impacts along and east of the I-95 corridor. 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.

Prepare for dangerous rainfall flooding having significant impacts
east of the Blue Ridge Mountains.

* WIND:
Prepare for dangerous wind having possible significant impacts along
and east of the I-95 corridor.
  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.

* SURGE:
Prepare for locally hazardous surge having possible moderate impacts
along the tidal Potomac River. Potential impacts in this area
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.

* TORNADOES:
Prepare for a tornado event having possible limited impacts across far
southern Maryland. 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.

Elsewhere across Eastern West Virginia, Central and Western Maryland,
Northern and Northwestern Virginia, and District of Columbia, little
to no impact is anticipated.

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

* OTHER PREPAREDNESS INFORMATION:
Now is the time to check your emergency plan and emergency supplies
kit and take necessary actions to protect your family and secure your
home or business.

When making safety and preparedness decisions, do not focus on the
exact forecast track since hazards such as flooding rain, damaging
wind gusts, storm surge, and tornadoes extend well away from the
center of the storm.

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 near an already swollen river, plan to
move to safe shelter on higher ground.

Always heed the advice of local officials and comply with orders that
are issued. Do not needlessly jeopardize your life or the lives of
others.

When securing your property, outside preparations should be concluded
as soon as possible before conditions deteriorate. The onset of
strong gusty winds or flooding can cause certain preparedness
activities to become unsafe.

Check on those who may not be fully aware of the situation or who are
unable to make personal preparations.

Closely monitor weather.gov, NOAA Weather Radio and local news
outlets for official storm information. Listen for possible changes
to the forecast.

There is a threat from tornadoes with this storm. Have multiple ways
to receive Tornado Warnings. Be ready to shelter quickly.

* 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 Baltimore MD/Washington DC around 530 PM EDT, or sooner if
conditions warrant.

$$
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