Winter weather alerts can be confusing if you are not sure what separates a watch from a warning, but the distinction actually matters for how you should plan your day or your snow removal expectations.
A snowfall watch means conditions are favourable for a significant snow event, but there is still meaningful uncertainty about exact timing, amount, or whether the system will fully develop. It is essentially an early heads-up to stay alert and start preparing, without necessarily needing to change your plans yet. A snowfall warning, on the other hand, means the snow event is expected with much higher confidence, or is already underway, and typically calls for more immediate action.
For homeowners, a watch is a good moment to double check that ice melt is stocked and your snow removal plan is active, while a warning is the point where you should expect service and possibly adjust your own schedule if travel looks risky. The same escalation applies to blizzard and squall alerts, which follow a similar watch-then-warning pattern but focus more heavily on wind and visibility rather than just accumulation.
Understanding this distinction helps you calibrate your response appropriately instead of either ignoring early alerts or overreacting to every mention of possible snow. It also helps set realistic expectations for when professional snow removal service should kick in.
What to Do During a Watch
A watch is your preparation window. Use it to check the items you will need if the storm does arrive:
- Move cars, bins and anything else off the driveway edges so a plow has room to work.
- Make sure edge markers are still standing, especially after wind or an earlier storm.
- Stock ice melt or a pet-safe de-icer for steps and walkways.
- Charge phones and check your plans for the next day in case travel gets difficult.
What to Do During a Warning
A warning means the snow is expected with high confidence or is already falling. This is the time to stay off the roads if you can and avoid parking where the plow needs to push snow. If you are on a seasonal plan with a set trigger depth, you do not need to call anyone: service is based on how much snow falls, not on which alert is active.
Why Alerts and Service Triggers Are Different
Weather alerts describe what might happen across a region. A snow removal trigger describes what actually landed on your property. At Thames Valley Snow, the trigger is 5 cm. A watch that ends with only a light dusting will not send a crew, while a storm that drops 5 cm or more puts your property on the route automatically, whether or not a warning was ever issued. Every visit is recorded with timestamped photos, so you can see when your property was cleared.
Other Alerts You May See
Environment Canada also issues alerts for freezing rain, blowing snow and snow squalls. Freezing rain is often the most dangerous for driveways and walkways because it leaves a glaze of ice even when snowfall totals are low. That is why salting is usually priced separately from plowing. Our seasonal salting add-on is $175 and covers freezing rain and refreeze visits.
Frequently Asked Questions
Should I book snow removal when a warning is issued?
It is better to have a plan in place before the season. Last-minute bookings during a warning are hard to fit into routes that are already full. A seasonal plan starts at $650, and single visits are $70.
Does a warning mean my driveway gets cleared sooner?
Service follows the snow on the ground, not the alert. Once 5 cm has fallen, your property is on the route for that storm.
Want snow removal that starts without a phone call? Request a free quote or call or text (548) 888-8702. You can also read about residential snow removal or commercial snow removal.
What's included… and what's extra
A Thames Valley Snow seasonal residential plan starts from $650 for a standard driveway. It covers clearing the driveway every time snowfall reaches the trigger depth in your agreement, plus the windrow the city plow leaves at the end of the driveway. Larger driveways are priced on our snow removal prices page.
Popular add-ons, priced per season: walkway and steps $150–175, salting $175, priority service $125, pet-safe salt $120, driveway extension $95 and city sidewalk clearing $90. Add only what your property needs; everything is listed on the quote so there are no surprises. Get your fixed price or call or text (548) 888-8702.
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