An orange weather warning in Canada means severe weather is likely to cause significant impacts that may be major, widespread or last for several days. Orange is the second-highest level in Canada’s colour-coded weather alert system, above yellow and below red.
When an orange weather warning is issued, people should prepare for potentially serious conditions and significant disruptions. Depending on the weather hazard, impacts may include dangerous travel conditions, transportation delays, power outages, property damage and risks to health and safety.
Orange weather warnings can apply to hazards such as snowfall, freezing rain, winter storms, extreme temperatures, severe thunderstorms and strong winds. This guide explains what an orange weather warning means, how serious it is, why orange alerts are issued and what you should do when one is in effect.
What Is an Orange Weather Warning?
An Orange Weather Warning is a colour-coded alert indicating severe weather that is likely to cause significant damage, disruption or health impacts.
Environment and Climate Change Canada describes the expected impacts of an Orange alert as potentially major, widespread and/or lasting for several days.
This means the potential consequences of the weather event are more significant than those generally associated with a Yellow alert.
Possible impacts of an Orange Weather Warning may include:
- Dangerous travel conditions
- Road closures
- Widespread transportation disruptions
- Significant power outages
- Damage to homes and infrastructure
- Flooding
- Major disruptions to daily activities
- School and business closures
- Health risks
- Disruptions to essential services
- Communities becoming temporarily isolated
- Significant risks to people in affected areas
The exact impacts depend on the weather hazard, location, duration and severity of the event.
For example, an Orange Warning – Snowfall and Orange Warning – Heat communicate the same general level of potential risk but involve different hazards, impacts and recommended actions.
Environment and Climate Change Canada provides additional information about Yellow, Orange and Red weather alerts and how the colours communicate increasing levels of potential risk.
How Serious Is an Orange Weather Warning?
An Orange Weather Warning should be taken seriously because it indicates severe weather that is likely to cause significant impacts.
Orange is the middle of Canada’s three weather alert colours.
It represents a higher level of potential risk than Yellow but does not reach the extreme level associated with a Red alert.
Depending on the weather hazard, an Orange Warning may result in dangerous travel, widespread power outages, significant property damage, health risks and major disruptions to communities.
The expected impacts may be major, widespread and/or last for several days.
Major Impacts
Major impacts can significantly affect transportation, infrastructure, property, health and daily activities.
Roads may close, transportation services may be cancelled and homes or infrastructure may be damaged.
Widespread Impacts
Orange alerts may involve impacts affecting a larger geographic area or a greater number of people.
Widespread power outages, transportation disruptions or flooding may affect several communities.
Long-Lasting Impacts
Some Orange alerts may involve weather events or consequences that continue for several days.
For example, a severe winter storm may end while road closures, power outages and transportation disruptions continue during cleanup and recovery.
Environment and Climate Change Canada uses Weather Impact Guides to assess how hazardous weather may affect daily life, travel, utilities and services, land and structures, human health and community recovery.
How Are Orange Weather Warnings Issued?
Orange Weather Warnings are issued when severe weather is happening or expected and the potential risk falls within the Orange level of Canada’s colour-coded alert system.
Environment and Climate Change Canada considers two primary factors when selecting an alert colour:
- Expected impacts
- Forecast confidence
Expected impacts refer to the potential consequences of the weather event.
Forecast confidence refers to how certain forecasters are that those impacts will occur.
These factors are combined using an Alert Colour Matrix.
This means the colour of a weather warning is not determined solely by a specific temperature, snowfall amount, wind speed or rainfall total.
The same weather conditions may create different impacts depending on the location, time of year, population, infrastructure and vulnerability of the affected area.
Environment and Climate Change Canada’s Alert Colour Matrix explains how expected impacts and forecast confidence are combined when selecting Yellow, Orange or Red.
What Types of Orange Weather Warnings Are There?
Several weather hazards in Canada may be issued as Orange Warnings.
Although every Orange alert communicates the same general level of potential risk, the weather conditions, impacts and recommended actions depend on the specific hazard.
Orange Warning – Air Quality
An Orange Warning – Air Quality is issued when air quality reaches or is forecast to reach the very-high-risk category.
According to Air Quality Ontario, an Orange Warning – Air Quality is issued when the Air Quality Health Index is forecast to reach, or has reached, 10+.
Very poor air quality can create serious health risks, particularly for people who are more vulnerable to air pollution.
Learn more about what an Air Quality Warning means in Canada.
Orange Warning – Blizzard
An Orange Warning – Blizzard indicates severe blizzard conditions with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Strong winds combined with falling or blowing snow may create severely reduced visibility, dangerous travel and significant transportation disruptions.
Learn more about what a Blizzard Warning means in Canada.
Orange Warning – Coastal Flooding
An Orange Warning – Coastal Flooding indicates severe coastal flooding with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Possible impacts may include flooded roads, damage to homes and infrastructure and significant disruption to coastal communities.
Learn more about what a Coastal Flooding Warning means in Canada.
Orange Warning – Extreme Cold
An Orange Warning – Extreme Cold indicates dangerously cold conditions with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Extreme cold can create serious health risks and significantly affect transportation, infrastructure and outdoor activities.
Learn more about what an Extreme Cold Warning means in Canada.
Orange Warning – Freezing Rain
An Orange Warning – Freezing Rain indicates severe freezing rain with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Significant ice accumulation may create dangerous travel conditions, damage trees and electrical infrastructure and cause widespread power outages.
Learn more about what a Freezing Rain Warning means in Canada.
Orange Warning – Heat
An Orange Warning – Heat indicates dangerously hot conditions with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Prolonged or extreme heat may create significant health risks and place additional pressure on healthcare and other essential services.
Learn more about what a Heat Warning means in Canada.
Orange Warning – Rainfall
An Orange Warning – Rainfall indicates severe rainfall with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Heavy or prolonged rain may cause significant flooding, road closures, property damage and widespread transportation disruptions.
Learn more about what a Rainfall Warning means in Canada.
Orange Warning – Severe Thunderstorm
An Orange Warning – Severe Thunderstorm indicates severe thunderstorms with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Possible impacts may include significant wind damage, large hail, flooding, widespread power outages and major transportation disruptions.
Learn more about what a Severe Thunderstorm Warning means in Canada.
Orange Warning – Snowfall
An Orange Warning – Snowfall indicates severe snowfall with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Heavy or prolonged snow may cause dangerous travel, widespread road closures, transportation cancellations and significant disruption to communities.
Learn more about what a Snowfall Warning means in Canada.
Orange Warning – Snow Squall
An Orange Warning Snow Squall indicates severe snow squalls with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Possible impacts may include extremely dangerous driving conditions, significant snow accumulation, highway closures and major transportation disruptions.
Learn more about what a Snow Squall Warning means in Canada.
Orange Warning – Tornado
An Orange Warning – Tornado indicates a tornado threat with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Dangerous conditions may cause significant property damage, widespread utility outages, transportation disruptions and serious risks to people in the affected area.
Learn more about what a Tornado Warning means in Canada.
Orange Warning – Wind
An Orange Warning – Wind indicates severe winds with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Possible impacts may include widespread tree damage, significant power outages, structural damage and major transportation disruptions.
Learn more about what a Wind Warning means in Canada.
Orange Warning – Winter Storm
An Orange Warning – Winter Storm indicates severe winter weather with potential impacts that fall within the Orange level of Canada’s colour-coded alert system.
Possible impacts may include dangerous or impossible travel, significant snow and ice accumulation, widespread transportation disruptions and power outages.
Learn more about what a Winter Storm Warning means in Canada.
Orange vs Yellow Weather Warning
The main difference between an Orange and Yellow Weather Warning is the level of potential risk communicated by the alert colour.
A Yellow Weather Warning indicates hazardous weather that may cause damage, disruption or health impacts. The expected impacts are generally moderate, localized and/or short-term.
An Orange Weather Warning indicates severe weather that is likely to cause significant damage, disruption or health impacts. The expected impacts may be major, widespread and/or last for several days.
Orange therefore represents a higher level of potential risk than Yellow.
However, the appropriate response depends on the specific weather hazard and information included in the warning.
Always read the complete warning rather than relying only on the alert colour.
Orange vs Red Weather Warning
The main difference between an Orange and Red Weather Warning is the severity of the potential impacts.
An Orange Weather Warning indicates severe weather that is likely to cause significant damage, disruption or health impacts.
A Red Weather Warning indicates very dangerous and possibly life-threatening weather that is expected to cause extreme damage and disruption.
The expected impacts of an Orange alert may be major, widespread and/or last for several days.
The expected impacts of a Red alert may be extensive, widespread and prolonged.
Red therefore represents a higher level of potential risk than Orange.
Can an Orange Weather Warning Become Yellow or Red?
The colour assigned to a weather warning may change as weather conditions, expected impacts and forecast confidence change.
An Orange Weather Warning may be updated if new information indicates that the potential risk has increased or decreased.
If the potential risk increases significantly, a Red alert may be issued.
If the potential risk decreases, the alert colour may change to Yellow.
For this reason, people should continue monitoring the latest weather information rather than relying only on an earlier warning.
Always read the complete alert because it may contain updated information about expected conditions, timing, affected locations, potential impacts and recommended actions.
What Should You Do During an Orange Weather Warning?
The appropriate response to an Orange Weather Warning depends on the specific weather hazard.
An Orange Warning – Snowfall requires different precautions than an Orange Warning – Heat or Orange Warning – Severe Thunderstorm.
However, several general actions apply to most Orange Weather Warnings.
Read the Complete Warning
Do not rely only on the Orange alert colour.
Read the complete warning to understand the weather hazard, affected locations, expected timing, potential impacts and recommended actions.
Monitor Current Conditions Closely
Weather conditions and forecasts can change.
Continue checking current weather information while the warning remains in effect.
Environment and Climate Change Canada provides official weather radar and satellite services that can help people monitor approaching weather conditions.
Reconsider Travel and Outdoor Activities
Severe weather may make travel and outdoor activities dangerous.
Consider changing plans before conditions deteriorate.
Prepare for Significant Disruptions
Depending on the hazard, an Orange Warning may result in power outages, transportation cancellations, road closures or interruptions to essential services.
Take reasonable precautions based on the expected conditions and information included in the warning.
Follow Recommended Actions
The warning may include specific actions people should take.
Follow recommendations from Environment and Climate Change Canada and instructions from local authorities and emergency officials.
Check for Updated Alerts
The expected impacts or forecast confidence may change as the weather event develops.
Continue monitoring current information for updated warnings and alert colours.
How Long Does an Orange Weather Warning Last?
There is no standard duration for an Orange Weather Warning.
The length of the alert depends on the weather hazard, timing, duration, expected impacts and forecast confidence.
Some Orange alerts may remain in effect for several hours.
Others may continue for a day or longer.
The impacts of severe weather may also continue after the warning ends.
Road closures, power outages, flooding and transportation disruptions may remain while communities recover.
Always check current weather information to determine whether an alert remains in effect for your location.
How Can You Check Current Orange Weather Warnings?
Current Orange Weather Warnings can be checked through Environment and Climate Change Canada’s official weather services.
The official Weather Information map allows users to check current forecasts and weather alerts across Canada.
The Government of Canada’s WeatherCAN application also provides official forecasts, alerts and customizable notifications.
Frequently Asked Questions About Orange Weather Warnings
An orange weather warning means severe weather is likely to cause significant impacts that may be major, widespread or last for several days.
Orange is the middle of Canada’s three colour-coded weather alert levels and indicates a serious weather situation with the potential for significant impacts.
An orange weather warning can involve dangerous conditions and significant disruptions. The specific risks depend on the hazard, location and expected impacts.
Driving may be dangerous depending on the weather hazard and local conditions. Check official alerts and road conditions and consider delaying unnecessary travel.
Travel may be possible, but significant delays, cancellations and hazardous conditions can occur.
Whether you should stay home depends on the specific hazard, local conditions and official guidance. Because significant impacts are expected, unnecessary travel and outdoor activities should be carefully considered.
There is no standard duration. An orange weather warning may remain in effect for several hours or multiple days.
Yes. An orange alert can be upgraded to red if the expected impacts increase or downgraded to yellow if the expected impacts decrease.
Weather alerts are issued through Environment and Climate Change Canada and the Meteorological Service of Canada.
Sources
- https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.html
- https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/weather-impact-guides.html
- https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/choose-alert-colours.html
- https://www.airqualityontario.com/aqhi/alerts.php
- https://www.canada.ca/en/services/environment/weather/radar-satellites.html
- https://www.canada.ca/en/environment-climate-change/services/weather-general-tools-resources/weather-webmapping.html
- https://www.canada.ca/en/environment-climate-change/services/weather-general-tools-resources/weathercan.html