Ice storms: why they are the worst winter storm
A quarter inch of ice can bring down a region's power grid for days. What makes freezing rain different from snow and how to get ready.
A big snowfall shuts a city down for a day. An ice storm can leave it without power for a week. It is the winter storm that looks least dramatic and does the most damage.
What makes it different from snow
Snow piles up and can be shovelled. Freezing rain falls liquid and freezes on contact, forming a continuous, adhering layer over lines, branches, roofs, roads and sidewalks.
That adhesion is the problem. Ice does not blow off the way dry snow does: it stays, keeps adding weight, and turns any slender structure into something far heavier than it was designed to carry.
| Phenomenon | What it is | Main risk |
|---|---|---|
| Snow | Solid crystals that accumulate | Roof loads, blocked roads |
| Sleet | Ice pellets that bounce | Slick pavement |
| Freezing rain | Water that freezes on contact | Grid failure, black ice |
Prepare for a long outage
The main consequence is not the storm but what follows. Plan for several days without electricity:
- Backup power for essentials, calculated in watt-hours.
- A heat plan that does not depend on the grid and does not burn anything indoors.
- Stored water, because many supply pumps are electric.
- Food that requires no cooking.
- Phones and power banks charged before it starts.
- A full fuel tank: without power, station pumps do not run.
On the road: black ice
Black ice is a thin, transparent layer on pavement. You cannot see it because it does not change the colour of the road, only makes it look wet.
It forms first on bridges and overpasses, because they cool from above and below at once and get no heat from the ground. If you must drive, those stretches deserve a speed reduction even when the rest of the road looks normal.
The most useful rule remains the simplest: if there is a freezing rain warning, do not go out.
After the storm
The risk does not end when the precipitation stops. Ice-loaded branches keep giving way for hours or days, and they fall without warning onto cars, roofs and people.
- Avoid walking under ice-loaded trees.
- Do not try to knock ice off branches: they break in unexpected directions.
- Walk with cleats or take short, slow steps.
- Clear ice from exits and the path to the house in case you need to leave fast.
- Check on older neighbours: ice isolation lasts several days and hits hardest for anyone living alone.
- How to keep pipes from freezing and bursting A burst pipe floods a house in minutes. Which pipes are at risk, why a dripping faucet helps, and what to do if one already froze.
- How to stay warm at home without power Shrinking the space, sealing the gaps and layering clothing beats any improvised heater. And the methods that kill people every winter.
Gear that covers this
Products that match what the guide above recommends.
Affiliate disclosure: As an Amazon Associate we earn from qualifying purchases. This does not change the price you pay or the recommendations we make.
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Portable power station
Ice storm outages are measured in days. It runs indoors with no exhaust, unlike a fuel generator.
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NOAA weather radio
Freezing rain is often warned with little lead time and the alerts change fast. Radio keeps working without power or signal.
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Ice cleats for footwear
Walking on ice is the most common cause of injury in these storms. They slip over any shoe and cost little.
Frequently asked questions
What is an ice storm?
Freezing rain: liquid water that freezes on contact with surfaces below freezing. It coats everything in clear ice, and it takes very little thickness to cause serious damage.
Why do ice storms cause more outages than snowstorms?
Because ice adheres and adds enormous weight to lines and branches. A layer of roughly a quarter inch can multiply the load on a power line, and loaded branches fall onto the wires.
What is black ice?
A thin, transparent layer of ice on pavement that is indistinguishable from wet road. It is especially dangerous on bridges and overpasses, which cool from above and below.
How long can an ice storm outage last?
Days or even weeks in poorly connected areas, because crews have to work on iced roads and repair many points at once. Plan for several days of autonomy, not hours.