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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
511 AM EDT Fri Jul 19 2019

ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-200915-
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-
511 AM EDT Fri Jul 19 2019

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...Today and Tonight

An Excessive Heat Warning is in effect for the Washington DC and
Baltimore MD metro areas from 11 AM to 9 PM EDT.

A Heat Advisory is in effect for southern Maryland to the
Fredericksburg VA area from 11 AM to 9 PM EDT.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

A Heat Advisory is in effect from 11 AM until 9 PM Friday.

An Excessive Heat Watch is in effect for the late morning into
early evening on Saturday and Sunday.

Thunderstorms are possible late Sunday through Monday, and may
be capable of producing damaging wind gusts or flooding.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

$$



Excessive Heat Watch

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
352 AM EDT Fri Jul 19 2019

DCZ001-MDZ004>006-011-013-014-503>508-VAZ052>054-505-506-191600-
/O.UPG.KLWX.HT.Y.0002.190719T1500Z-190720T0100Z/
/O.NEW.KLWX.EH.W.0001.190719T1500Z-190720T0100Z/
/O.CON.KLWX.EH.A.0003.190720T1500Z-190721T0100Z/
/O.CON.KLWX.EH.A.0004.190721T1500Z-190722T0100Z/
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Southern Baltimore-Prince Georges-Anne Arundel-
Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Southeast Harford-Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Western Loudoun-Eastern Loudoun-
Including the cities of Washington, 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, Germantown, Damascus, Bethesda,
Rockville, Gaithersburg, Silver Spring, Lisbon, Columbia,
Ellicott City, Jarrettsville, Aberdeen, Dale City, Manassas,
Woodbridge, Lake Ridge, Montclair, Reston, Herndon, Annandale,
Centreville, Chantilly, McLean, Franconia, Arlington, Alexandria,
Falls Church, Purcellville, Leesburg, Ashburn, and Sterling
352 AM EDT Fri Jul 19 2019

...EXCESSIVE HEAT WARNING IN EFFECT FROM 11 AM THIS MORNING TO
9 PM EDT THIS EVENING...
...EXCESSIVE HEAT WATCH REMAINS IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY EVENING...
...EXCESSIVE HEAT WATCH REMAINS IN EFFECT FROM SUNDAY MORNING
THROUGH SUNDAY EVENING...

The National Weather Service in Baltimore MD/Washington has
upgraded the Heat Advisory to an Excessive Heat Warning, which is
in effect from 11 AM this morning to 9 PM EDT this evening. The
Heat Advisory is no longer in effect.

* HEAT INDEX VALUES...Near 110 degrees today, then potentially 110
  to 115 degrees Saturday and Sunday due to temperatures in the
  upper 90s to around 100 degrees and dewpoints in the lower to
  middle 70s.

* Impacts...Dangerously high temperatures and humidity could
  quickly cause heat stress or heat stroke if precautions are
  not taken.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

An Excessive Heat Warning means that a prolonged period of
dangerously high temperatures will occur. The combination of
extreme temperatures and high humidity will create a dangerous
situation in which heat illnesses are expected. Check in on
relatives and neighbors.

An Excessive Heat Watch means that a prolonged period of
dangerously high temperatures is possible. Prepare for extreme
temperatures and high humidity which would create a situation in
which heat illnesses are expected.

Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency - call 911.

&&

$$



Excessive Heat Watch

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
352 AM EDT Fri Jul 19 2019

DCZ001-MDZ004>006-011-013-014-503>508-VAZ052>054-505-506-191600-
/O.UPG.KLWX.HT.Y.0002.190719T1500Z-190720T0100Z/
/O.NEW.KLWX.EH.W.0001.190719T1500Z-190720T0100Z/
/O.CON.KLWX.EH.A.0003.190720T1500Z-190721T0100Z/
/O.CON.KLWX.EH.A.0004.190721T1500Z-190722T0100Z/
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Southern Baltimore-Prince Georges-Anne Arundel-
Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Southeast Harford-Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Western Loudoun-Eastern Loudoun-
Including the cities of Washington, 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, Germantown, Damascus, Bethesda,
Rockville, Gaithersburg, Silver Spring, Lisbon, Columbia,
Ellicott City, Jarrettsville, Aberdeen, Dale City, Manassas,
Woodbridge, Lake Ridge, Montclair, Reston, Herndon, Annandale,
Centreville, Chantilly, McLean, Franconia, Arlington, Alexandria,
Falls Church, Purcellville, Leesburg, Ashburn, and Sterling
352 AM EDT Fri Jul 19 2019

...EXCESSIVE HEAT WARNING IN EFFECT FROM 11 AM THIS MORNING TO
9 PM EDT THIS EVENING...
...EXCESSIVE HEAT WATCH REMAINS IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY EVENING...
...EXCESSIVE HEAT WATCH REMAINS IN EFFECT FROM SUNDAY MORNING
THROUGH SUNDAY EVENING...

The National Weather Service in Baltimore MD/Washington has
upgraded the Heat Advisory to an Excessive Heat Warning, which is
in effect from 11 AM this morning to 9 PM EDT this evening. The
Heat Advisory is no longer in effect.

* HEAT INDEX VALUES...Near 110 degrees today, then potentially 110
  to 115 degrees Saturday and Sunday due to temperatures in the
  upper 90s to around 100 degrees and dewpoints in the lower to
  middle 70s.

* Impacts...Dangerously high temperatures and humidity could
  quickly cause heat stress or heat stroke if precautions are
  not taken.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

An Excessive Heat Warning means that a prolonged period of
dangerously high temperatures will occur. The combination of
extreme temperatures and high humidity will create a dangerous
situation in which heat illnesses are expected. Check in on
relatives and neighbors.

An Excessive Heat Watch means that a prolonged period of
dangerously high temperatures is possible. Prepare for extreme
temperatures and high humidity which would create a situation in
which heat illnesses are expected.

Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency - call 911.

&&

$$



Excessive Heat Warning

URGENT - WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
352 AM EDT Fri Jul 19 2019

DCZ001-MDZ004>006-011-013-014-503>508-VAZ052>054-505-506-191600-
/O.UPG.KLWX.HT.Y.0002.190719T1500Z-190720T0100Z/
/O.NEW.KLWX.EH.W.0001.190719T1500Z-190720T0100Z/
/O.CON.KLWX.EH.A.0003.190720T1500Z-190721T0100Z/
/O.CON.KLWX.EH.A.0004.190721T1500Z-190722T0100Z/
District of Columbia-Frederick MD-Carroll-Northern Baltimore-
Southern Baltimore-Prince Georges-Anne Arundel-
Northwest Montgomery-Central and Southeast Montgomery-
Northwest Howard-Central and Southeast Howard-Northwest Harford-
Southeast Harford-Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Western Loudoun-Eastern Loudoun-
Including the cities of Washington, 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, Germantown, Damascus, Bethesda,
Rockville, Gaithersburg, Silver Spring, Lisbon, Columbia,
Ellicott City, Jarrettsville, Aberdeen, Dale City, Manassas,
Woodbridge, Lake Ridge, Montclair, Reston, Herndon, Annandale,
Centreville, Chantilly, McLean, Franconia, Arlington, Alexandria,
Falls Church, Purcellville, Leesburg, Ashburn, and Sterling
352 AM EDT Fri Jul 19 2019

...EXCESSIVE HEAT WARNING IN EFFECT FROM 11 AM THIS MORNING TO
9 PM EDT THIS EVENING...
...EXCESSIVE HEAT WATCH REMAINS IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY EVENING...
...EXCESSIVE HEAT WATCH REMAINS IN EFFECT FROM SUNDAY MORNING
THROUGH SUNDAY EVENING...

The National Weather Service in Baltimore MD/Washington has
upgraded the Heat Advisory to an Excessive Heat Warning, which is
in effect from 11 AM this morning to 9 PM EDT this evening. The
Heat Advisory is no longer in effect.

* HEAT INDEX VALUES...Near 110 degrees today, then potentially 110
  to 115 degrees Saturday and Sunday due to temperatures in the
  upper 90s to around 100 degrees and dewpoints in the lower to
  middle 70s.

* Impacts...Dangerously high temperatures and humidity could
  quickly cause heat stress or heat stroke if precautions are
  not taken.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

An Excessive Heat Warning means that a prolonged period of
dangerously high temperatures will occur. The combination of
extreme temperatures and high humidity will create a dangerous
situation in which heat illnesses are expected. Check in on
relatives and neighbors.

An Excessive Heat Watch means that a prolonged period of
dangerously high temperatures is possible. Prepare for extreme
temperatures and high humidity which would create a situation in
which heat illnesses are expected.

Take extra precautions if you work or spend time outside. When
possible, reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear light weight and loose fitting clothing when
possible and drink plenty of water.

To reduce risk during outdoor work, the Occupational Safety and
Health Administration recommends scheduling frequent rest breaks
in shaded or air conditioned environments. Anyone overcome by
heat should be moved to a cool and shaded location. Heat stroke
is an emergency - call 911.

&&

$$



Air Quality Alert

DCZ001-MDZ004-503-504-013-016>018-VAZ505-506-052>054-200400-
DISTRICT OF COLUMBIA-FREDERICK MD-MONTGOMERY-PRINCE GEORGES-
CHARLES-ST. MARYS-CALVERT-LOUDOUN-
PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-
440 PM EDT Thu Jul 18 2019

...AIR QUALITY ALERT IS IN EFFECT FOR FRIDAY JULY 19 2019...

The Metropolitan Washington Council of Governments in association
with Maryland Department of the Environment, Virginia Department
of Environmental Quality, and District Department of Environment
has issued a Code ORANGE Air Quality Alert Friday for
the DC metro area.

A Code Orange Air Quality Alert means that air pollution
concentrations within the region may become unhealthy for
sensitive groups. Sensitive groups include children, people
suffering from asthma, heart disease or other lung diseases and
the elderly. The effects of air pollution can be minimized by
avoiding strenuous activity or exercise outdoors.

For more information on ground-level ozone and fine particles
please visit the Maryland Department of the Environment Web
Site at wwww.mde.maryland.gov/programs/air/.

$$



U.S. Dept. of Commerce
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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