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Hurricane Local Statement

Tropical Storm Isaias Local Statement Advisory Number 27...CORRECTED
DCZ001-MDZ003>006-011-013-014-016>018-503>508-VAZ025>031-036>040-050>057-501-502-505>508-WVZ050>053-055-040330-

Tropical Storm Isaias Local Statement Advisory Number 27...CORRECTED
National Weather Service Baltimore MD/Washington DC  AL092020
533 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 490 miles south-southwest of Washington DC or about 530
      miles south-southwest of Baltimore MD
    - 32.0N 79.4W
    - Storm Intensity 70 mph
    - Movement North-northeast or 15 degrees at 16 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. The strongest winds are expected across
southern Maryland, where tree damage and power outages are more
likely. Moderate coastal flooding is also likely along the western
shores of the Chesapeake Bay and at Washington DC Southwest
Waterfront on Tuesday. Minor coastal flooding is likely along other
tidal waters.

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

* FLOODING RAIN:
Protect against life-threatening rainfall flooding having possible
extensive impacts along and east of 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.

* WIND:
Protect against 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.

* SURGE:
Protect against locally hazardous surge having possible moderate
impacts along the Tidal Potomac River and along the western shore of
the 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
----------------------------------

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.

Failure to adequately shelter may result in serious injury or loss of
life. Always heed the advice of local officials and comply with any
orders that are issued. Remember, during the storm 9 1 1 Emergency
Services may not be able to immediately respond if conditions are
unsafe. This should be a big factor in your decision making.

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 a Tornado Warning is issued for your area, be ready to shelter
quickly, preferably away from windows and in an interior room not
prone to flooding. If driving, scan the roadside for quick shelter
options.

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.

* 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 830 PM EDT, or sooner if
conditions warrant.

$$



Coastal Flood Advisory

Coastal Hazard Message
National Weather Service Baltimore MD/Washington DC
515 PM EDT Mon Aug 3 2020

MDZ013-VAZ053-054-040515-
/O.UPG.KLWX.CF.A.0006.200804T1000Z-200805T0400Z/
/O.NEW.KLWX.CF.Y.0047.200804T2000Z-200805T0700Z/
Prince Georges-Fairfax-Arlington/Falls Church/Alexandria-
515 PM EDT Mon Aug 3 2020

...COASTAL FLOOD ADVISORY IN EFFECT FROM 4 PM TUESDAY TO 3 AM EDT
WEDNESDAY...

* WHAT...Up to one foot of inundation above ground level
  expected in low lying areas due to tidal flooding.

* WHERE...In Maryland, Prince Georges County. In Virginia,
  Fairfax County, and Arlington/Falls Church/Alexandria.

* WHEN...From 4 PM Tuesday to 3 AM EDT Wednesday, especially
  around the time of high tide.

* IMPACTS...Water is expected to approach the curb near the
  intersection of King Street and Strand Street in Alexandria.

* ADDITIONAL DETAILS...Tides two and a half to three feet above
  normal. High tide Tuesday evening in Alexandria is at 10:02 PM.
  Due to storm surge, the actual highest tide levels may occur at
  different times than the usual high tide.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If travel is required, allow extra time as some roads may be
closed. Do not drive around barricades or through water of
unknown depth. Take the necessary actions to protect flood-prone
property.

&&

$$

JE



Tropical Storm Warning

Isaias Local Watch/Warning Statement/Advisory Number 27
National Weather Service Baltimore MD/Washington DC  AL092020
508 PM EDT Mon Aug 3 2020

VAZ054-040515-
/O.CON.KLWX.TR.W.1009.000000T0000Z-000000T0000Z/
Arlington/Falls Church/Alexandria-
508 PM EDT Mon Aug 3 2020

...TROPICAL STORM WARNING REMAINS IN EFFECT...

* LOCATIONS AFFECTED
    - Alexandria
    - Falls Church

* WIND
    - LATEST LOCAL FORECAST: Below tropical storm force wind
        - Peak Wind Forecast: 15-25 mph with gusts to 40 mph

    - THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
      UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for wind 39
      to 57 mph
        - The wind threat has remained nearly steady from the
          previous assessment.
        - PLAN: Plan for hazardous wind of equivalent tropical storm
          force.
        - PREPARE: Remaining efforts to protect property should be
          completed as soon as possible. Prepare for limited wind
          damage.
        - ACT: Move to safe shelter before the wind becomes hazardous.

    - POTENTIAL IMPACTS: Limited
        - Damage to porches, awnings, carports, sheds, and unanchored
          mobile homes. Unsecured lightweight objects blown about.
        - Many large tree limbs broken off. A few trees snapped or
          uprooted, but with greater numbers in places where trees
          are shallow rooted. Some fences and roadway signs blown
          over.
        - A few roads impassable from debris, particularly within
          urban or heavily wooded places. Hazardous driving
          conditions on bridges and other elevated roadways.
        - Scattered power and communications outages.

* STORM SURGE
    - LATEST LOCAL FORECAST: Localized storm surge possible
        - Peak Storm Surge Inundation: The potential for 1-3 feet
          above ground somewhere within surge prone areas
        - Window of concern: Tuesday morning until Wednesday morning

    - THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
      UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for storm
      surge flooding greater than 1 foot above ground
        - The storm surge threat has remained nearly steady from the
          previous assessment.
        - PLAN: There is little to no threat of storm surge flooding.
          Rough surf, coastal erosion, and life-threatening rip
          currents are possible.
        - PREPARE: Little to no preparations for storm surge flooding
          are needed.
        - ACT: Follow the instructions of local officials. Monitor
          forecasts.

    - REALIZED IMPACTS: Being Assessed
        - Little to no additional surge impacts expected. Community
          officials are now assessing the extent of actual surge
          impacts accordingly.

* FLOODING RAIN
    - LATEST LOCAL FORECAST: Flash Flood Watch is in effect
        - Peak Rainfall Amounts: Additional 3-6 inches, with locally
          higher amounts

    - THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
      UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for major
      flooding rain
        - The flooding rain threat has remained nearly steady from
          the previous assessment.
        - PLAN: Emergency plans should include the potential for
          major flooding from heavy rain. Evacuations and rescues are
          likely.
        - PREPARE: Strongly consider protective actions, especially
          if you are in an area vulnerable to flooding.
        - ACT: Heed any flood watches and warnings. Failure to take
          action will likely result in serious injury or loss of life.

    - POTENTIAL IMPACTS: Extensive
        - 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.

* TORNADO
    - LATEST LOCAL FORECAST:
        - Situation is unfavorable for tornadoes

    - THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
      UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Tornadoes not expected
        - The tornado threat has remained nearly steady from the
          previous assessment.
        - PLAN: Tornadoes are not expected. Showers and thunderstorms
          with gusty winds may still occur.
        - PREPARE: Little to no preparations needed to protect
          against tornadoes at this time. Keep informed of the latest
          tornado situation.
        - ACT: Listen for changes in the forecast.

    - POTENTIAL IMPACTS: Little to None
        - Little to no potential impacts from tornadoes.

* FOR MORE INFORMATION:
    - http://ready.gov/hurricanes

$$



Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
200 PM EDT Mon Aug 3 2020

ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-041000-
Chesapeake Bay north of Pooles Island MD-
Chesapeake Bay from Pooles Island to Sandy Point MD-
Chesapeake Bay from Sandy Point to North Beach MD-
Chesapeake Bay from North Beach to Drum Point MD-
Chesapeake Bay from Drum Point MD to Smith Point VA-
Tidal Potomac from Key Bridge to Indian Head MD-
Tidal Potomac from Indian Head to Cobb Island MD-
Tidal Potomac from Cobb Island MD to Smith Point VA-
Patapsco River including Baltimore Harbor-
Chester River to Queenstown MD-Eastern Bay-
Choptank River to Cambridge MD and the Little Choptank River-
Patuxent River to Broomes Island MD-
Tangier Sound and the inland waters surrounding Bloodsworth
Island-District of Columbia-Southern Baltimore-Prince Georges-
Anne Arundel-Charles-St. Marys-Calvert-Southeast Harford-
Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-
200 PM EDT Mon Aug 3 2020

This Hazardous Weather Outlook is for the Maryland portion of the
Chesapeake Bay, Tidal Potomac River, and adjacent counties in
central Maryland and northern Virginia as well as the District of
Columbia.

.DAY ONE...This Afternoon and Tonight

Showers are expected with scattered thunderstorms today through
tonight with locally damaging wind gusts being the primary
threat. The most widespread activity is this afternoon and evening.

A Tropical Storm Warning is in effect for the entire outlook area
tonight as Tropical Storm Isaias approaches the area. Consult the
Hurricane Local Statement for more details.

A Coastal Flood Watch and Flash Flood Watch are also in effect.
Consult the Coastal Flood and Flash Flood messages for more
details.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

A Tropical Storm Warning is in effect for the entire outlook area
Tuesday as Tropical Storm Isaias moves over the area.

A Flash Flood Watch and Coastal Flood Watch are also in effect
Tuesday into Tuesday night. Refer to the Flash Flood and Coastal
Flood messages for more details.

.SPOTTER INFORMATION STATEMENT...

Please report any instances of flooding or wind damage to the
National Weather Service.

$$



Flash Flood Watch

Flood Watch
National Weather Service Baltimore MD/Washington DC
148 PM EDT Mon Aug 3 2020

DCZ001-MDZ003>006-011-013-014-016>018-503>508-VAZ028-030-031-
052>055-057-501-502-505-506-WVZ050>053-040200-
/O.CON.KLWX.FF.A.0017.200804T0300Z-200805T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
District of Columbia-Washington-Frederick MD-Carroll-
Northern Baltimore-Southern Baltimore-Prince Georges-Anne Arundel-
Charles-St. Marys-Calvert-Northwest Montgomery-
Central and Southeast Montgomery-Northwest Howard-
Central and Southeast Howard-Northwest Harford-Southeast Harford-
Frederick VA-Warren-Clarke-Prince William/Manassas/Manassas Park-
Fairfax-Arlington/Falls Church/Alexandria-Stafford-King George-
Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-Hampshire-Morgan-Berkeley-Jefferson-
Including the cities of Washington, Hagerstown, Frederick,
Ballenger Creek, Eldersburg, Westminster, Reisterstown,
Cockeysville, Baltimore, Bowie, Suitland-Silver Hill, Clinton,
College Park, Greenbelt, Laurel, Camp Springs, Glen Burnie,
Annapolis, Severn, South Gate, Severna Park, Arnold, Odenton,
St. Charles, Waldorf, Lexington Park, California,
Chesapeake Beach, Huntingtown, Dunkirk, North Beach, Lusby,
Prince Frederick, Germantown, Damascus, Bethesda, Rockville,
Gaithersburg, Silver Spring, Lisbon, Columbia, Ellicott City,
Jarrettsville, Aberdeen, Winchester, Front Royal, Berryville,
Dale City, Manassas, Woodbridge, Lake Ridge, Montclair, Reston,
Herndon, Annandale, Centreville, Chantilly, McLean, Franconia,
Arlington, Alexandria, Falls Church, Falmouth, Dahlgren,
Warrenton, Turnbull, Purcellville, Leesburg, Ashburn, Sterling,
Romney, Paw Paw, Martinsburg, Charles Town, and Shepherdstown
148 PM EDT Mon Aug 3 2020

...FLASH FLOOD WATCH REMAINS IN EFFECT FROM 11 PM EDT THIS
EVENING THROUGH TUESDAY EVENING...

The Flash Flood Watch continues for

* Portions of Maryland, The District of Columbia, Virginia, and
  West Virginia, including the following areas, in Maryland,
  Anne Arundel, Calvert, Carroll, Central and Southeast Howard,
  Central and Southeast Montgomery, Charles, Frederick, Northern
  Baltimore, Northwest Harford, Northwest Howard, Northwest
  Montgomery, Prince Georges, Southeast Harford, Southern
  Baltimore, St. Marys, and Washington. The District of
  Columbia. In Virginia, Arlington/Falls Church/Alexandria,
  Clarke, Eastern Loudoun, Fairfax, Frederick, King George,
  Northern Fauquier, Prince William, Southern Fauquier,
  Stafford, Warren, and Western Loudoun. In West Virginia,
  Berkeley, Hampshire, Jefferson, and Morgan.

* From 11 PM EDT this evening through Tuesday evening

* Rainfall associated with Tropical Storm Isaias is expected to
  start spreading northward late tonight and continue into
  Tuesday evening. Widespread rainfall totals of 3 to 6 inches are
  expected with localized higher amounts possible.

* This amount of rain is likely to result in significant flash
  flooding of small streams and creeks Monday night into Tuesday
  evening.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead
to flash flooding. Flash flooding is a very dangerous situation.

You should monitor later forecasts and be prepared to take action
should Flash Flood Warnings be issued.

&&

$$




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NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
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