Tropical Storm Warning
Isaias Local Watch/Warning Statement/Advisory Number 28
National Weather Service Baltimore MD/Washington DC AL092020
1111 PM EDT Mon Aug 3 2020
MDZ017-041115-
/O.CON.KLWX.TR.W.1009.000000T0000Z-000000T0000Z/
St. Marys-
1111 PM EDT Mon Aug 3 2020
...TROPICAL STORM WARNING REMAINS IN EFFECT...
* LOCATIONS AFFECTED
- St Marys City
* WIND
- LATEST LOCAL FORECAST: Equivalent Tropical Storm force wind
- Peak Wind Forecast: 45-55 mph with gusts to 70 mph
- Window for Tropical Storm force winds: until late Tuesday
afternoon
- THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for wind 58
to 73 mph
- The wind threat has remained nearly steady from the
previous assessment.
- PLAN: Plan for dangerous wind of equivalent strong tropical
storm force.
- PREPARE: Last minute efforts to protect life and property
should now be complete. The area remains subject to
significant wind damage.
- ACT: Now is the time to shelter from dangerous wind.
- POTENTIAL IMPACTS: Unfolding
- Potential impacts from the main wind event are unfolding.
* 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: through 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: Plan for storm surge flooding greater than 1 foot
above ground.
- PREPARE: Complete preparations for storm surge flooding,
especially in low-lying vulnerable areas, before conditions
become unsafe.
- ACT: Leave immediately if evacuation orders are given for
your area.
- POTENTIAL IMPACTS: Limited
- 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.
* FLOODING RAIN
- LATEST LOCAL FORECAST: Flash Flood Watch is in effect
- Peak Rainfall Amounts: Additional 4-8 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 somewhat favorable for tornadoes
- THREAT TO LIFE AND PROPERTY THAT INCLUDES TYPICAL FORECAST
UNCERTAINTY IN TRACK, SIZE AND INTENSITY: Potential for a few
tornadoes
- The tornado threat has remained nearly steady from the
previous assessment.
- PLAN: Emergency plans should continue to include possible
tornadoes.
- PREPARE: Stay within your shelter keeping informed of the
latest tornado situation.
- ACT: Move quickly to the safest place within your shelter
if a tornado warning is issued.
- POTENTIAL IMPACTS: Limited
- 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.
* FOR MORE INFORMATION:
- http://ready.gov/hurricanes
$$
Coastal Flood Warning
Coastal Hazard Message
National Weather Service Baltimore MD/Washington DC
307 AM EDT Tue Aug 4 2020
MDZ017-042315-
/O.CON.KLWX.CF.W.0005.200804T1500Z-200805T0700Z/
St. Marys-
307 AM EDT Tue Aug 4 2020
...COASTAL FLOOD WARNING REMAINS IN EFFECT FROM 11 AM THIS
MORNING TO 3 AM EDT WEDNESDAY...
* WHAT...One to two feet of inundation above ground level
expected in low lying areas due to tidal flooding.
* WHERE...Shoreline in St. Marys County.
* WHEN...From 11 AM Tuesday to 3 AM EDT Wednesday, especially
around the time of high tide.
* IMPACTS...At 3.0 feet, yards are flooded on Saint George
Island, and water will begin covering the road leading to the
island, especially if there is wave action.
* ADDITIONAL DETAILS...Tides two to two and a half feet above
normal. The next high tides at Point Lookout are at 2:44 PM and
3:14 AM. The next high tides at Piney Point are at 3:20 AM and
3:50 PM. The next high tides at Coltons Point are at 3:56 AM and
4:26 PM.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take the necessary actions to protect flood-prone property. If
travel is required, do not drive around barricades or through
water of unknown depth.
&&
Time of high total tides are approximate to the nearest hour.
St Marys River at Straits Point
MLLW Categories - Minor 3.0 ft, Moderate 3.5 ft, Major 5.0 ft
MHHW Categories - Minor 1.4 ft, Moderate 1.9 ft, Major 3.4 ft
Total Total Departure
Day/Time Tide Tide from Norm Waves Flood
ft MLLW ft MHHW ft ft Impact
-------- --------- --------- --------- ------- --------
04/03 AM 2.0 0.4 0.3 1 None
04/04 PM 3.4 1.8 1.9 1 Minor
05/02 AM 3.3 1.7 1.9 1 Minor
05/04 PM 2.2 0.6 0.7 0 None
06/04 AM 2.3 0.7 0.7 0 None
06/05 PM 2.3 0.7 0.8 0-1 None
&&
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
232 AM EDT Tue Aug 4 2020
ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-050645-
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-
232 AM EDT Tue Aug 4 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...Overnight
A Tropical Storm Warning is in effect for the entire outlook area
overnight as Tropical Cyclone Isaias approaches the area. Consult
the Hurricane Local Statement for more details.
A Flash Flood Watch is also in effect. Consult the and Flash
Flood message for more details.
A Tornado Watch is also in effect for the counties in Maryland
along the western shore of the Chesapeake Bay.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
A Tropical Storm Warning is in effect for the entire outlook area
Tuesday as Tropical Cyclone Isaias moves over the area.
A Flash Flood Watch and Coastal Flood Warnings are also in effect
Tuesday into Tuesday night. Refer to the Flash Flood and Coastal
Flood messages for more details.
A Tornado Watch is also in effect for the counties in Maryland
along the western shore of the Chesapeake Bay until noon.
.SPOTTER INFORMATION STATEMENT...
Please report any instances of flooding or wind damage to the
National Weather Service.
$$
Tornado Watch
WATCH COUNTY NOTIFICATION FOR WATCH 415
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
227 AM EDT TUE AUG 4 2020
MDC003-005-009-025-037-510-041600-
/O.CON.KLWX.TO.A.0415.000000T0000Z-200804T1600Z/
TORNADO WATCH 415 REMAINS VALID UNTIL NOON EDT TODAY FOR THE
FOLLOWING AREAS
IN MARYLAND THIS WATCH INCLUDES 6 COUNTIES
IN CENTRAL MARYLAND
ANNE ARUNDEL
IN NORTHERN MARYLAND
BALTIMORE BALTIMORE CITY HARFORD
IN SOUTHERN MARYLAND
CALVERT ST. MARYS
THIS INCLUDES THE CITIES OF ABERDEEN, ANNAPOLIS, ARNOLD,
BALTIMORE, BEL AIR, CALIFORNIA, CATONSVILLE, CHESAPEAKE BEACH,
DUNDALK, DUNKIRK, EDGEWOOD, ESSEX, FALLSTON, GLEN BURNIE,
HAVRE DE GRACE, HUNTINGTOWN, JOPPATOWNE, LEXINGTON PARK, LUSBY,
NORTH BEACH, ODENTON, PARKVILLE, PIKESVILLE, PRINCE FREDERICK,
RANDALLSTOWN, SEVERN, SEVERNA PARK, SOUTH GATE, AND TOWSON.
$$
Flash Flood Watch
Flood Watch
National Weather Service Baltimore MD/Washington DC
205 AM EDT Tue Aug 4 2020
DCZ001-MDZ003>006-011-013-014-016>018-503>508-VAZ031-052>055-057-
501-502-505-506-WVZ053-042000-
/O.CON.KLWX.FF.A.0017.000000T0000Z-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-
Clarke-Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-King George-
Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-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, 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, Charles Town,
and Shepherdstown
205 AM EDT Tue Aug 4 2020
...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING...
The Flash Flood Watch continues for
* Portions of Maryland, The District of Columbia, Virginia, and
panhandle 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, King
George, Northern Fauquier, Prince William, Southern Fauquier,
Stafford, and Western Loudoun. In panhandle West Virginia,
Jefferson.
* Through this 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. Rain
amounts will be highest near and east of the Interstate 95
corridor.
* 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.
&&
$$
Hurricane Local Statement
Hurricane Isaias Local Statement Advisory Number 28
DCZ001-MDZ003>006-011-013-014-016>018-503>508-VAZ027>031-036>040-050>057-501-502-505>508-WVZ051>053-041130-
Hurricane Isaias Local Statement Advisory Number 28
National Weather Service Baltimore MD/Washington DC AL092020
1123 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 360 miles south-southwest of Washington DC or about 390
miles south-southwest of Baltimore MD
- 33.8N 78.5W
- Storm Intensity 85 mph
- Movement North-northeast or 20 degrees at 22 mph
SITUATION OVERVIEW
------------------
Hurricane Isaias will approach from the Carolinas tonight and move
across the Chesapeake Bay region Tuesday morning. The center of the
storm will rapidly exit to the northeast Tuesday afternoon.
Significant flash flooding of small streams and creeks is likely
tonight into Tuesday evening as rainfall associated with 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, and 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 near 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.
Protect against dangerous rainfall flooding having possible limited
to significant impacts across other locations near and east of the Blue
Ridge Mountains.
* 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.
Also, protect against hazardous wind having possible limited impacts
elsewhere near and east of the Interstate 95 corridor.
Elsewhere across Eastern West Virginia, Central and Western Maryland,
Northern and Northwestern Virginia, little to no impact is anticipated.
* SURGE:
Protect against locally hazardous surge having possible limited
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.
Keep cell phones well charged. Cell phone chargers for automobiles
can be helpful, but be aware of your risk for deadly carbon monoxide
poisoning if your car is left idling in a garage or other poorly
ventilated area.
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 530 AM EDT, or sooner if
conditions warrant.
