Heat Advisory
URGENT - WEATHER MESSAGE
National Weather Service Mount Holly NJ
252 AM EDT Mon May 18 2026
NJZ015-017>019-PAZ070-071-104-106-182015-
/O.NEW.KPHI.HT.Y.0001.260518T1600Z-260520T0000Z/
Mercer-Gloucester-Camden-Northwestern Burlington-Delaware-
Philadelphia-Eastern Montgomery-Lower Bucks-
Including the cities of Norristown, Cherry Hill, Trenton,
Philadelphia, Camden, Glassboro, Moorestown, Doylestown,
Morrisville, Mount Holly, Lansdale, and Media
252 AM EDT Mon May 18 2026
...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM EDT TUESDAY...
* WHAT...Heat index values up to 97 degrees expected.
* WHERE...In New Jersey, Mercer, Camden, Gloucester, and
Northwestern Burlington Counties. In Pennsylvania, Delaware,
Eastern Montgomery, Lower Bucks, and Philadelphia Counties.
* WHEN...From noon today to 8 PM EDT Tuesday.
* IMPACTS...Hot temperatures and high humidity may cause heat
illnesses.
* ADDITIONAL DETAILS...Record setting temperatures possible through
Wednesday. Tuesday will likely be the hottest day with highs in
the mid 90s throughout the urban corridor.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.
&&
$$
AKL
Small Craft Advisory
URGENT - MARINE WEATHER MESSAGE
National Weather Service Baltimore MD/Washington DC
423 AM EDT Mon May 18 2026
ANZ531>534-537>543-181630-
/O.CON.KLWX.SC.Y.0086.260518T1900Z-260519T0600Z/
Chesapeake Bay from Pooles Island to Sandy Point MD-
Chesapeake Bay from Sandy Point to North Beach MD-
Chesapeake Bay from North Beach to Drum Point MD-
Chesapeake Bay from Drum Point MD to Smith Point VA-
Tidal Potomac from Cobb Island MD to Smith Point VA-
Patapsco River including Baltimore Harbor-
Chester River to Queenstown MD-Eastern Bay-
Choptank River to Cambridge MD and the Little Choptank River-
Patuxent River to Broomes Island MD-
Tangier Sound and the inland waters surrounding Bloodsworth
Island-
423 AM EDT Mon May 18 2026
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 3 PM THIS
AFTERNOON TO 2 AM EDT TUESDAY...
* WHAT...South winds 10 to 15 kt with gusts up to 20 kt expected.
* WHERE...Chesapeake Bay from Smith Point VA to Pooles Island MD
and adjoining estuaries, and Tidal Potomac from Cobb Island MD
to Smith Point VA.
* WHEN...From 3 PM Monday to 2 AM EDT Tuesday.
* IMPACTS...Conditions will be hazardous to small craft.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Inexperienced mariners, especially those operating smaller
vessels, should avoid navigating in hazardous conditions.
&&
$$
Air Quality Alert
NJZ001-007>010-191400-
Sussex-Warren-Morris-Hunterdon-Somerset-
Including the cities of Newton, Washington, Morristown, Flemington,
and Somerville
958 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING...
The New Jersey Department of Environmental Protection has issued a
Code Orange Air Quality Action Day for Ground Level Ozone, until
11 PM EDT this evening.
An Air Quality Advisory means that air quality within the region may
approach or exceed unhealthy standards. For more information on
current and forecast concentrations of ground-level ozone and fine
particulates, visit www.airnow.gov or www.state.nj.us/dep/airmon/ or
call the New Jersey Bureau of Air Monitoring at 609-292-0138
$$
NJZ012-015-017>019-191400-
Middlesex-Mercer-Gloucester-Camden-Northwestern Burlington-
Including the cities of New Brunswick, Trenton, Glassboro, Camden,
Cherry Hill, Moorestown, and Mount Holly
958 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...AIR QUALITY ALERT IN EFFECT FROM 11 AM TO 11 PM EDT TUESDAY...
The New Jersey Department of Environmental Protection has issued a
Code Orange Air Quality Action Day for Ground Level Ozone, until
11 PM EDT this evening.
An Air Quality Advisory means that air quality within the region may
approach or exceed unhealthy standards. For more information on
current and forecast concentrations of ground-level ozone and fine
particulates, visit www.airnow.gov or www.state.nj.us/dep/airmon/ or
call the New Jersey Bureau of Air Monitoring at 609-292-0138
$$
NJZ013-014-016-020-021-026-027-191400-
Western Monmouth-Eastern Monmouth-Salem-Ocean-Cumberland-
Coastal Ocean-Southeastern Burlington-
Including the cities of Freehold, Sandy Hook, Pennsville, Jackson,
Millville, Long Beach Island, and Wharton State Forest
958 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT FROM 11 AM TO 11 PM EDT TUESDAY...
The New Jersey Department of Environmental Protection has issued a
Code Orange Air Quality Action Day for Ground Level Ozone, from
11 AM to 11 PM EDT Tuesday.
An Air Quality Advisory means that air quality within the region may
approach or exceed unhealthy standards. For more information on
current and forecast concentrations of ground-level ozone and fine
particulates, visit www.airnow.gov or www.state.nj.us/dep/airmon/ or
call the New Jersey Bureau of Air Monitoring at 609-292-0138
$$
PAZ060>062-070-071-101>106-191400-
Berks-Lehigh-Northampton-Delaware-Philadelphia-Western Chester-
Eastern Chester-Western Montgomery-Eastern Montgomery-Upper Bucks-
Lower Bucks-
Including the cities of Reading, Allentown, Bethlehem, Easton,
Media, Philadelphia, Honey Brook, Oxford, West Chester,
Kennett Square, Collegeville, Pottstown, Norristown, Lansdale,
Chalfont, Perkasie, Morrisville, and Doylestown
958 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
The Pennsylvania Department of Environmental Protection has issued a
Code Orange Air Quality Action Day for Ground Level Ozone, until
midnight EDT tonight.
An Air Quality Action Day means that air quality within the region
may approach or exceed unhealthy standards. For more information on
current and forecast concentrations of ground-level ozone and fine
particulates, visit www.airnow.gov or www.aqpartners.state.pa.us
$$
CTZ005>007-009>011-190300-
Northern Fairfield-Northern New Haven-Northern Middlesex-
Southern Fairfield-Southern New Haven-Southern Middlesex-
944 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING...
The Connecticut Department of Energy and Environmental Protection`s
Air Quality Action Day for the following counties:
Fairfield, New Haven, and Middlesex,
remains in effect until 11 PM EDT this evening.
An Air Quality Action Day means that Ground Level Ozone within the
region may approach or exceed unhealthy standards. For additional
information, please visit the Connecticut Department of Energy and
Environmental Protection Web site at http://www.ct.gov/deep/aqi
$$
NJZ002-190300-
Western Passaic-
944 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING...
The New Jersey Department of Environmental Protection has issued an
Air Quality Action Day for the following counties:
Western Passaic,
until 11 PM EDT this evening.
An Air Quality Action Day means that Ground Level Ozone within the
region may approach or exceed unhealthy standards.
For additional information, please visit the New Jersey Department
of Environmental Protection Web site at https://dep.nj.gov/airmon
$$
NJZ004-006-103>108-190300-
Eastern Passaic-Hudson-Western Bergen-Eastern Bergen-Western Essex-
Eastern Essex-Western Union-Eastern Union-
944 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING...
...AIR QUALITY ALERT IN EFFECT FROM 11 AM TO 11 PM EDT TUESDAY...
The New Jersey Department of Environmental Protection has issued an
Air Quality Action Day for the following counties:
Bergen, Eastern Passaic, Hudson, Essex, and Union.
until 11 PM EDT this evening.
Another air quality alert is in effect for these same locations from
11 AM to 11 PM EDT Tuesday.
An Air Quality Action Day means that Ground Level Ozone within the
region may approach or exceed unhealthy standards.
For additional information, please visit the New Jersey Department
of Environmental Protection Web site at https://dep.nj.gov/airmon
$$
NYZ067>075-176-178-190300-
Orange-Putnam-Rockland-Northern Westchester-Southern Westchester-
New York (Manhattan)-Bronx-Richmond (Staten Island)-Kings (Brooklyn)-
Northern Queens-Southern Queens-
944 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING...
The New York State Department of Environmental Conservation`s Air
Quality Health Advisory for the following counties:
New York, Bronx, Kings, Queens, Richmond, Westchester, and
Rockland,
now includes two additional counties: Orange and Putnam,
This Air Quality Health Advisory is in effect until 11 PM EDT this
evening.
Air quality levels in outdoor air are predicted to be greater than
an Air Quality Index value of 100 for the pollutant of Ground Level
Ozone. The Air Quality Index, or AQI, was created as an easy way to
correlate levels of different pollutants to one scale. The higher
the AQI value, the greater the health concern.
When pollution levels are elevated, the New York State Department of
Health recommends that individuals consider limiting strenuous
outdoor physical activity to reduce the risk of adverse health
effects. People who may be especially sensitive to the effects of
elevated levels of pollutants include the very young, and those with
preexisting respiratory problems such as asthma or heart disease.
Those with symptoms should consider consulting their personal
physician.
For additional information, please visit the New York State
Department of Environmental Conservation website at,
https://on.ny.gov/nyaqi, or call the Air Quality Hotline at
1 800 5 3 5, 1 3 4 5.
$$
NYZ062-190145-
Sullivan-
Including the city of Monticello
937 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING...
The New York State Department of Environmental Conservation at
Albany has issued a Air Quality Health Advisory for Ground Level
Ozone from 11am this morning until 11 PM EDT this evening.
Air quality levels in outdoor air are predicted to be greater than
an air quality index value of 100 for Ground Level Ozone. The air
quality index...or AQI...was created as an easy way to correlate
levels of different pollutants to one scale. The higher the AQI
value, the greater the health concern.
When pollution levels are elevated...the New York State Department
of Health recommends that individuals consider limiting strenuous
outdoor physical activity to reduce the risk of adverse health
effects. People who may be especially sensitive to the effects of
elevated levels of pollutants include the very young and those with
pre existing respiratory problems such as asthma or heart disease.
Those with symptoms should consider consulting their personal
physician.
For additional information, please visit the New York State
Department of Environmental Conservation website at,
https://on.ny.gov/nyaqi, or call the Air Quality Hotline at
800-535-1345.
$$
CTZ001-013-190300-
Northern Litchfield-Southern Litchfield-
Including the cities of Torrington, Oakville, Gaylordsville,
New Milford, Terryville, and Thomaston
932 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING...
The Connecticut Department of Environmental Protection has issued a
Air Quality Action Day for Ground Level Ozone from 11 AM this morning
until 11 PM EDT this evening.
An Air Quality Action Day means that Ground Level Ozone
concentrations within the region may approach or exceed unhealthy
standards. For additional information...please visit the Connecticut
Air Quality Web site at http://www.ct.gov/deep/aqi
$$
NYZ063>066-190300-
Western Ulster-Eastern Ulster-Western Dutchess-Eastern Dutchess-
Including the cities of Ellenville, Woodstock, West Hurley,
West Shokan, Kerhonkson, Napanoch, Sundown, Kingston, New Paltz,
Poughkeepsie, Beacon, Arlington, Pawling, Wingdale, Dover Plains,
Millbrook, Stanfordville, Pine Plains, and Amenia
932 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL 11 PM EDT THIS EVENING...
The New York State Department of Environmental Conservation at
Albany has issued a Air Quality Health Advisory for Ground Level
Ozone from 11 AM this morning until 11 PM EDT this evening.
Air quality levels in outdoor air are predicted to be greater than
an air quality index value of 100 for Ground Level Ozone. The air
quality index...or AQI...was created as an easy way to correlate
levels of different pollutants to one scale. The higher the AQI
value, the greater the health concern.
When pollution levels are elevated...the New York State Department
of Health recommends that individuals consider limiting strenuous
outdoor physical activity to reduce the risk of adverse health
effects. People who may be especially sensitive to the effects of
elevated levels of pollutants include the very young and those with
pre existing respiratory problems such as asthma or heart disease.
Those with symptoms should consider consulting their personal
physician.
For additional information, please visit the New York State
Department of Environmental Conservation website at,
https://on.ny.gov/nyaqi, or call the Air Quality Hotline at 800-535-
1345.
$$
PAZ057-059-063-065-066-190400-
Dauphin-Lebanon-Cumberland-York-Lancaster-
835 AM EDT Mon May 18 2026
...AIR QUALITY ALERT IN EFFECT UNTIL MIDNIGHT EDT TONIGHT...
The Pennsylvania Department of Environmental Protection has issued
a Code ORANGE Air Quality Alert for Ground Level Ozone, until
midnight EDT tonight.
A Code ORANGE Air Quality Alert means that air pollution
concentrations within the region may become unhealthy for
sensitive groups. Sensitive groups include children, people
suffering from asthma, heart disease or other lung diseases,
and the elderly. The effects of air pollution can be minimized
by avoiding strenuous activity or exercise outdoors.
For more information on ground-level ozone and fine particles,
visit www.airnow.gov, and www.aqpartners.state.pa.us.
$$
MDZ006-507-190400-
Northern Baltimore-Northern Harford-
440 PM EDT Sun May 17 2026
...AIR QUALITY ALERT IS IN EFFECT FOR MONDAY MAY 18 2026...
The Maryland Department of the Environment has issued a Code
ORANGE Air Quality Alert Monday for
Northern Baltimore.
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 visit the web site
mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx.
$$
MDZ008-508-190400-
Southern Harford-Cecil-
440 PM EDT Sun May 17 2026
...AIR QUALITY ALERT IS IN EFFECT FOR MONDAY MAY 18 2026...
The Maryland Department of the Environment has issued a Code
ORANGE Air Quality Alert Monday for
Northeast Maryland.
A Code Orange Air Quality Alert means that air pollution
concentrations within the region may become unhealthy for
sensitive groups. Sensitive groups include children, people
suffering from asthma, heart disease or other lung diseases and
the elderly. The effects of air pollution can be minimized by
avoiding strenuous activity or exercise outdoors.
For more information on ground-level ozone
and fine particles visit the web site
mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx.
$$
MDZ011-014-190400-
Southern Baltimore-Anne Arundel-
440 PM EDT Sun May 17 2026
...AIR QUALITY ALERT IS IN EFFECT FOR MONDAY MAY 18 2026...
The Maryland Department of the Environment has issued a Code
ORANGE Air Quality Alert Monday for
the Baltimore City Metro and Annapolis region.
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 visit the web site
mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx.
$$
Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
436 AM EDT Mon May 18 2026
MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508-
526-WVZ050>053-055-190845-
Washington-Frederick-Carroll-Northern Baltimore-
Northwest Montgomery-Northwest Howard-Northwest Harford-Augusta-
Rockingham-Shenandoah-Page-Warren-Clarke-Nelson-Albemarle-Greene-
Madison-Rappahannock-Orange-Culpeper-Northern Fauquier-
Southern Fauquier-Western Loudoun-Eastern Loudoun-
Northern Virginia Blue Ridge-Central Virginia Blue Ridge-
Northwest Prince William-Hampshire-Morgan-Berkeley-Jefferson-
Hardy-
436 AM EDT Mon May 18 2026
This Hazardous Weather Outlook is for portions of eastern West
Virginia, northern and central Virginia, and central and western
Maryland.
.DAY ONE...Today and Tonight
Isolated severe thunderstorms capable of producing damaging winds
are possible across the eastern WV Panhandle and Catoctin
mountains this afternoon and evening.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday
Isolated severe thunderstorms are possible ahead of a cold front
on Wednesday into Wednesday night.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Hazardous Weather Outlook
National Weather Service State College PA
239 AM EDT Mon May 18 2026
PAZ019-045-046-049>053-190645-
Southern Centre-Southern Clinton-Southern Lycoming-Union-Snyder-
Montour-Northumberland-Columbia-
239 AM EDT Mon May 18 2026
This Hazardous Weather Outlook is for central Pennsylvania.
.DAY ONE...Tonight.
Isolated to scattered strong to severe thunderstorms with gusty
winds are possible late this afternoon and evening.
.DAYS TWO THROUGH SEVEN...Monday through Saturday.
Isolated to scattered strong to severe thunderstorms with gusty
winds and a few instances of hail are possible expected Tuesday
afternoon and evening.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Hazardous Weather Outlook
National Weather Service State College PA
239 AM EDT Mon May 18 2026
PAZ026>028-034>036-056>059-063>066-190645-
Huntingdon-Mifflin-Juniata-Bedford-Fulton-Franklin-Perry-Dauphin-
Schuylkill-Lebanon-Cumberland-Adams-York-Lancaster-
239 AM EDT Mon May 18 2026
This Hazardous Weather Outlook is for central Pennsylvania.
.DAY ONE...Tonight.
Isolated to scattered strong to severe thunderstorms with gusty
winds are possible late this afternoon and evening.
.DAYS TWO THROUGH SEVEN...Monday through Saturday.
The probability for widespread hazardous weather is low.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
Lambert
Hazardous Weather Outlook
National Weather Service Binghamton NY
222 AM EDT Mon May 18 2026
NYZ022>025-044>046-055>057-062-PAZ038>040-043-044-047-048-072-190630-
Steuben-Schuyler-Chemung-Tompkins-Cortland-Chenango-Otsego-Tioga-
Broome-Delaware-Sullivan-Bradford-Susquehanna-Northern Wayne-Wyoming-
Lackawanna-Luzerne-Pike-Southern Wayne-
222 AM EDT Mon May 18 2026
This Hazardous Weather Outlook is for central New York and
northeast Pennsylvania.
.DAY ONE...Today and tonight.
There is a low probability for widespread hazardous weather.
.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.
There is a marginal to slight risk for severe thunderstorms Tuesday
afternoon and into the evening.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
