[Tropical] Hurricane Local Statement

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Tropical Storm Isaias Local Statement Advisory Number 26
National Weather Service Baltimore MD/Washington DC  AL092020
1136 AM EDT Mon Aug 3 2020

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

**Tropical Storm Warnings extended farther northwest**

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

* CHANGES TO WATCHES AND WARNINGS:
    - A Tropical Storm Warning has been issued for Carroll, Central
      and Southeast Howard, Central and Southeast Montgomery,
      Northern Baltimore, Northwest Harford, Northwest Howard,
      Northwest Montgomery, and Spotsylvania
    - The Tropical Storm Watch has been upgraded to a Tropical Storm
      Warning for Anne Arundel, Arlington/Falls Church/Alexandria,
      Charles, District of Columbia, Fairfax, King George, Prince
      Georges, Prince William/Manassas/Manassas Park, Southeast
      Harford, Southern Baltimore, and Stafford

* 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 590 miles south-southwest of Washington DC or about 620
      miles south-southwest of Baltimore MD
    - 30.7N 80.1W
    - Storm Intensity 70 mph
    - Movement North or 360 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
are possible in this area. Moderate coastal flooding is also
possible at times of high tide Tuesday as Isaias makes its
closest approach to the area and continuing Wednesday morning.

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

* FLOODING RAIN:
Protect against life-threatening rainfall flooding having possible
extensive impacts across areas 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.

Protect against dangerous rainfall flooding having possible limited
to significant impacts across areas west of the I-95 corridor to the
western mountains.

* WIND:
Protect against dangerous wind having possible significant impacts
along and east of the I-95 corridor including the Washington DC and
Baltimore metro 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.

Also, protect against hazardous wind having possible limited impacts
along and east of the I-81 corridor.

* SURGE:
Protect against locally hazardous surge having possible limited
impacts across Tidal Potomac and Chesapeake Bay. 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:
Protect against a tornado event having possible limited impacts
across 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
----------------------------------

* EVACUATIONS:
WATCH/WARNING PHASE - Listen to local official for recommended
preparedness actions, including possible evacuation of low lying
areas. If ordered to evacuate, do so immediately.

* OTHER PREPAREDNESS INFORMATION:
Now is the time to complete all preparations to protect life and
property in accordance with your emergency plan. Ensure you are in a
safe location before the onset of strong winds or possible flooding.

If you are a visitor, be sure to know the name of the city or town in
which you are staying and the name of the county or parish in which
it resides. Listen for these locations in local news updates. Pay
attention for instructions from local authorities.

If you live in a place particularly vulnerable to flooding, such as
areas along tidal locations, in low-lying or poor drainage areas, in
a valley, or near an already swollen river, be prepared to move
quickly to safe shelter on higher ground.

Rapidly rising flood waters are deadly. If you are in a flood-prone
area, consider moving to higher ground. Never drive through a flooded
roadway. Remember, turn around don't drown!

If in a place that is vulnerable to high wind, such as near large
trees, a manufactured home, upper floors of a high-rise building, or
on a boat, consider moving to a safer location before the onset of
strong winds.

Closely monitor weather.gov, NOAA Weather radio or local news outlets
for official storm information. Be ready to adapt to possible changes
to the forecast. Ensure you have multiple ways to receive weather
warnings.

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 230 PM EDT, or sooner if
conditions warrant.

$$
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