Excessive Heat Warnings And Severe Thunderstorm Watches Issued For Maine & The Maritimes

URGENT - WEATHER MESSAGE

National Weather Service Gray ME

144 PM EDT Wed Jul 1 2026

MEZ021-022-024>026-020745-

/O.UPG.KGYX.XH.A.0001.260702T1500Z-260703T0000Z/

/O.EXB.KGYX.XH.W.0001.260702T1500Z-260703T0000Z/

/O.CON.KGYX.HT.Y.0004.000000T0000Z-260702T0000Z/

Kennebec-Interior Waldo-Coastal Cumberland-Sagadahoc-Lincoln-

Including the cities of Bowdoinham, Alna, Portland, Augusta,

Liberty, Bremen, Yarmouth, Whitefield, Wiscasset, Bowdoin,

Morrill, Montville, China, Bristol, South Portland, Bath,

Phippsburg, Brooks, Knox, Topsham, Waterville, Waldoboro,

Jefferson, Jackson, Newcastle, Winterport, Waldo, Cape Elizabeth,

Dresden, Sidney, Damariscotta, Vassalboro, Westbrook, Boothbay

Harbor, Unity, Arrowsic, Brunswick, Palermo, and Windsor

144 PM EDT Wed Jul 1 2026

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING...

...EXTREME HEAT WARNING IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY...

* WHAT...For the Heat Advisory, heat index values up to 104. For the

  Extreme Heat Warning, dangerously hot conditions with heat index

  values up to 110 expected.

* WHERE...Interior Waldo, Kennebec, Lincoln, Sagadahoc, and Coastal

  Cumberland Counties.

* WHEN...For the Heat Advisory, until 8 PM EDT this evening. For the

  Extreme Heat Warning, from 11 AM to 8 PM EDT Thursday.

* IMPACTS...Heat related illnesses increase significantly during

  extreme heat and high humidity events. Hot temperatures and high

  humidity may cause heat illnesses.

* ADDITIONAL DETAILS...Overnight low temperatures will only fall

  into the 70s, resulting in accumulated heat stress.

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.

Do not leave young children and pets in unattended vehicles. Car

interiors will reach lethal temperatures in a matter of minutes.

&&

$$

URGENT - WEATHER MESSAGE

National Weather Service Caribou ME

120 PM EDT Wed Jul 1 2026

MEZ005-006-020700-

/O.CON.KCAR.HT.Y.0002.260702T1500Z-260703T0000Z/

Northern Penobscot-Southeast Aroostook-

Including the cities of Hodgdon, East Millinocket, Millinocket,

Medway, Sherman, Patten, Smyrna Mills, and Houlton

120 PM EDT Wed Jul 1 2026

...HEAT ADVISORY REMAINS IN EFFECT FROM 11 AM TO 8 PM EDT THURSDAY...

* WHAT...Heat index values up to 97 expected.

* WHERE...Northern Penobscot and Southeast Aroostook Counties.

* WHEN...From 11 AM to 8 PM EDT Thursday.

* IMPACTS...Hot temperatures and high humidity may cause heat

  illnesses.

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.

Take extra precautions when outside. Wear lightweight and loose

fitting clothing. Try to limit strenuous activities to early morning

or evening. Take action when you see symptoms of heat exhaustion and

heat stroke.

&&

$$

10:16 PM ADT Wednesday 1 July 2026

Impact Level: Moderate

Forecast Confidence: High

Humidex values reaching 38 are expected.

Locations: mainland Nova Scotia.

Time span: Thursday and Friday, possibly persisting on Saturday.

Maximum temperature Thursday: 29 to 32 degrees Celsius (Humidex: near 38).

Minimum temperature Thursday night: 18 to 20 degrees Celsius.

Maximum temperature Friday: 29 to 33 degrees Celsius (Humidex: near 37).

Remarks: A very warm and increasingly humid air mass will gradually move into the region. Nighttime lows are also forecast to stay warm, providing little to no relief. This hot air mass may linger over the region into Saturday, though some uncertainty still exists in regards to its exit. Cooler conditions can be expected along parts of the immediate Atlantic coast.

Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day.

Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water. 

Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body.

Drink water often and before you feel thirsty to replace fluids. 

Close blinds, or shades and open windows if outside is cooler than inside. 

Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park. 

Follow the advice of your region’s public health authority.

Plan and schedule outdoor activities during the coolest parts of the day. 

Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat. 

Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.

Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.

For more information: How to protect yourself from the health effects of extreme heat Health risks and who is at risk of extreme heat events

Information is provided on the Nova Scotia Department of Health and Wellness website at novascotia.ca/heat-related-illness/.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to NSstorm@ec.gc.ca or post reports on X using #NSStorm.

Issued by Environment Canada and the Nova Scotia Department of Health and Wellness

In effect for:

Halifax Metro and Halifax County West

10:14 PM ADT Wednesday 1 July 2026

Impact Level: Moderate

Forecast Confidence: High

Humidex values reaching 41 are expected.

Locations: most of New Brunswick, except the Fundy coastline.

Time span: until Friday night.

Minimum temperature tonight: 18 to 20 degrees Celsius.

Maximum temperature Thursday: 30 to 33 degrees Celsius (Humidex: near 38 to 42).

Minimum temperature Thursday night: 20 to 22 degrees Celsius.

Maximum temperature Friday: 29 to 32 degrees Celsius (Humidex 36 to 40).

Remarks: A very warm and increasingly humid air mass will gradually move into the region over the next couple of days. Nighttime lows are also forecast to stay warm, providing little to no relief. This hot air mass may linger over the region into Saturday, though some uncertainty still exists regarding the timing of its exit. Cooler conditions can be expected along parts of the immediate Fundy coast.

Humidex values of 40 or higher are expected over all areas of New Brunswick (except coastal Fundy areas) from 2 P.M. to 7 P.M. on Thursday and over southern New Brunswick (except coastal Fundy areas) from 2 P.M. to 7 P.M. on Friday.

Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day.

Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water. 

Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body.

Drink water often and before you feel thirsty to replace fluids. 

Close blinds, or shades and open windows if outside is cooler than inside. 

Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park. 

Follow the advice of your region’s public health authority.

Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.

For more information: How to protect yourself from the health effects of extreme heat Health risks and who is at risk of extreme heat events

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to NBstorm@ec.gc.ca or post reports on X using #NBStorm.

In effect for:

Fredericton and Southern York County

10:08 PM ADT Wednesday 1 July 2026

Impact Level: Moderate

Forecast Confidence: High

Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts, large hail and heavy rain. There is also a risk of a tornado.

Locations: northern New Brunswick.

Potential rainfall rates: locally 25 to 50 mm per hour.

Potential wind gusts: 90 to 110 km/h.

Potential hail: nickel to quarter sized.

Time span: late this evening to after midnight.

Remarks: Thunderstorms, with potential to become severe, may develop tonight as the air mass over the region becomes increasingly unstable.

When thunder roars, go indoors! Lightning kills and injures Canadians every year.

Heavy rain can cause flash flooding and significant reductions to visibility. Strong wind gusts can damage trees, buildings and overturn vehicles. Severe thunderstorm watches are issued when conditions are favourable for the development of thunderstorms capable of producing damaging hail, wind or rain.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to NBstorm@ec.gc.ca or post reports on X using #NBStorm.

In effect for:

Edmundston and Madawaska County

10:09 PM ADT Wednesday 1 July 2026

Impact Level: Moderate

Forecast Confidence: High

Humidex values reaching 36 are expected.

Time span: Thursday and Friday.

Maximum temperature Thursday: 28 degrees Celsius (Humidex: near 36).

Minimum temperature Thursday night: 18 degrees Celsius.

Maximum temperature Friday: 28 degrees Celsius (Humidex: near 36).

Remarks: A very warm and increasingly humid air mass is forecast. Nighttime lows are also forecast to stay warm, providing little to no relief away from the immediate coast.

Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day.

Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water. 

Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body.

Drink water often and before you feel thirsty to replace fluids. 

Close blinds, or shades and open windows if outside is cooler than inside. 

Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park. 

Follow the advice of your region’s public health authority.

Plan and schedule outdoor activities during the coolest parts of the day. 

Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat. 

Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.

Heat warnings are issued when very high temperature or humidity conditions are expected to pose an elevated risk of heat illnesses, such as heat stroke or heat exhaustion.

For more information: How to protect yourself from the health effects of extreme heat Health risks and who is at risk of extreme heat events

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to PEstorm@ec.gc.ca or post reports on X using #PEStorm.

In effect for:

Queens County P.E.I.