A North American severe-weather field guide
One continent. Two weather services.
Tornadoes, floods, heat, winter storms, and wildfire smoke don't stop at the 49th parallel — but the alerts do. Continental Signals reads the National Weather Service and Environment and Climate Change Canada side by side, in plain language, for people who need to make a decision now.
US · NWS · api.weather.govCA · ECCC · weather.gc.ca
The five hazards
Wildfire smoke
Same fires, different systems.
AQHI vs AQI, where the smoke is coming from, and how to breathe through it.
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Tornadoes
When the sky rotates.
Live NWS and ECCC tornado watches and warnings, plus what to do in the last five minutes.
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Floods
Water moves faster than you think.
Flash flood vs river flood, and live alerts from both sides of the border.
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Heat
The quiet killer.
HeatRisk, Humidex, cooling centres, and who to check on.
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Winter storms
When the storm closes the road.
Blizzard criteria, ice storm risk, and warming centres.
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Practical
Find help when the weather turns.
Cooling centres, warming centres, libraries with filtered air, shelters extending hours, and local health guidance.