[Tropical] Hurricane Local Statement

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Tropical Storm Isaias Local Statement Advisory Number 24
National Weather Service Baltimore MD/Washington DC  AL092020
1121 PM EDT Sun Aug 2 2020

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

**Tropical Storm Watches remain in effect for the Baltimore and
 Washington metro areas and southern Maryland**

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

* CHANGES TO WATCHES AND WARNINGS:
    - None

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

* STORM INFORMATION:
    - About 740 miles south-southwest of Washington DC or about 770
      miles south-southwest of Baltimore MD
    - 28.5N 79.8W
    - Storm Intensity 70 mph
    - Movement North-northwest or 345 degrees at 9 mph

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

Significant flash flooding of small streams and creeks is likely
Monday night 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 Monday night through Tuesday.
Moderate coastal flooding is also possible at times of high tide
Tuesday as Isaias makes its closest approach to the area. Minor wind
damage and scattered power outages are also possible especially across
southern Maryland.

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

* FLOODING RAIN:
Prepare for life-threatening rainfall flooding having possible
extensive impacts across all areas along and east of the Interstate 81
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
across reas along and east of Interstate 81 corridor. The threat is
particularly high along and east of the Interstate 95 corridor.

* SURGE:
Prepare for locally hazardous surge having possible limited impacts
along the tidal shores of the Chesapeake Bay and 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.

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

* WIND:
Prepare for dangerous wind having possible significant impacts across
southern Maryland. 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.

* TORNADOES:
The risk of isolated tornadoes exists near and to the southeast of the
track of Isaias.

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

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


* 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 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, plan to move to safe shelter.

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.

Be sure to let friends and family members know of your intentions for
weathering the storm and your whereabouts. Have someone located away
from the threatened area serve as your point of contact. Share vital
contact information with others. Keep cell phones handy and charged.

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

If you are a visitor, know the name of the county or parish in which
you are located and where it is relative to current watches and
warnings. If staying at a hotel, ask the management staff about their
onsite disaster plan. Listen for evacuation orders, especially
pertaining to area visitors.

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 5 AM EDT, or sooner if
conditions warrant.

$$
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