Winter Storm Warning
Check official winter storm warnings, watches and advisories
near you. Enter your ZIP or postal code to get started.
Check a Winter Storm Warning Near You
Use the checker above to look up official winter alerts for a supported US ZIP code or Canadian postal area. It brings together the alert name, affected area, timing and full bulletin details, so you can see what the weather service has issued for the approximate location returned by your code.
If you are checking a winter storm warning today, read the start time as well as the alert name. A warning issued today may concern conditions expected later tonight or tomorrow. The issuing agency’s bulletin explains when the hazard is expected and which places it covers.
What Does a Winter Storm Warning Mean?
A winter storm warning is an official notice that significant winter weather is expected or occurring in a defined area. The hazard may involve heavy snow, sleet, ice, blowing snow or a combination of conditions. It is a reason to read the local instructions and reconsider plans that depend on safe travel.
People often use “snow storm warning” or “snowstorm warning” when searching for this information. However, the alert’s official name matters: a winter storm warning is not limited to falling snow, and another bulletin may identify a more specific hazard. Our checker preserves the alert name supplied by the weather agency rather than renaming every winter storm alert as a snow warning.
Warning vs Watch vs Advisory
These terms describe different alert situations. The table explains common US winter-weather products; Canadian bulletins may use different names and criteria. Always read the actual alert for your location.
| Alert | What it tells you | How to use it |
|---|---|---|
| Winter Storm Warning | Significant winter-weather conditions are expected or occurring. | Follow the bulletin’s instructions and assess whether travel should be postponed. |
| Winter Storm Watch | Conditions could develop into a significant winter storm. | Prepare for possible disruption and check for forecast updates. |
| Winter Weather Advisory | Winter conditions can cause difficulties, even when warning criteria are not met. | Take local impacts seriously, especially for roads and visibility. |
There is no single nationwide snowfall total that triggers every warning. Criteria depend on the area and hazard. A watch also does not have to appear before every warning, so check the latest bulletin rather than assuming alerts always follow a fixed sequence.
How to Read Your Alert Result
Enter your code and select Check alerts. Confirm that the returned place is the one you intended, then expand the alert details. Start with the affected area and expected hazards before comparing the timing with your plans. Use Reset to clear the search and check another location.
Check the Area, Not Just the City Name
An alert can cover a forecast zone or several communities. Your ZIP or postal lookup represents an approximate point, not every road or address within the code. If your destination is near a boundary or at a different elevation, read the listed area carefully and confirm it with the official source.
Separate Storm Timing from Bulletin Expiry
The issue time records when the bulletin was published. The start and event-end times describe its expected weather window when supplied. Bulletin expiry concerns that particular message; it is not a promise that roads will be clear or the storm will be over. Times in this checker use your device’s time zone.
No winter alerts returned? That means the source returned no matching active winter alerts for the approximate location checked. It does not confirm safe roads, rule out a developing storm, or tell you whether schools will open. An “Unable to confirm alerts” message means the lookup failed—not that there is no warning.
Where to Find a Winter Storm Warning Map
A winter storm warning map is useful when you need the wider picture, such as which nearby counties or travel routes may be affected. This page provides a location-based alert lookup, not an interactive map. For US coverage, open the National Weather Service’s current alerts map and select the area you need to inspect.
For Canada, use Environment and Climate Change Canada through the checker’s “Sources & credits” section. A warning map shows issued alerts, while a snowfall forecast describes expected accumulation. Read the map’s legend and bulletin details rather than treating every coloured area as the same hazard.
Checking Mountain Areas: Sierra Nevada and Colorado
Mountain searches need particular care because a code’s approximate location may not represent a summit, ski area or mountain pass. The regional examples below explain how to use the checker; they do not indicate that a warning is currently active.
Winter Storm Warning in the Sierra Nevada
When checking a winter storm warning for the Sierra Nevada, look for elevation limits, named passes and the timing of the heaviest snowfall. Rain at a lower-elevation location can coexist with snow higher up. A result for a nearby town therefore cannot confirm conditions along an entire mountain route. Check the official forecast for your destination and the relevant transport agency’s road restrictions before travelling.
Winter Storm Warning in Colorado
A winter storm warning in Colorado may affect mountain zones while nearby valleys or plains have different conditions. Search the code closest to the place you need, then read the warning’s named area and any elevation-specific wording. For a journey across a pass, check the route itself as well: the forecast at your starting point is not a substitute for information about higher terrain.
Does a Winter Storm Warning Mean Schools Will Close?
No. A weather agency issues the warning; your school district or school board decides whether to close, delay opening or change transportation. A warning is relevant to planning, but it is not an official school announcement. Weather outside the school commute, conditions on bus routes and local operational decisions can lead to different outcomes.
If you want to explore the possible school impact, use our snow day calculator alongside the official alerts. It provides an estimate while you wait for your district’s decision. Our guide to why storm timing matters for school closures explains why an overnight storm and one intensifying during the morning commute can affect the school day differently.
Frequently Asked Questions
What states are expecting a winter storm?
The answer changes as weather systems develop. Check the current national forecast and official alert map rather than relying on a permanent list of states. Active warnings identify places where warnings have been issued; they are not a complete list of every state that might receive winter weather in the coming days. This checker searches one approximate location at a time.
Is a winter storm warning the same as a blizzard warning?
No. A blizzard warning concerns a particular combination of strong winds and severely reduced visibility in falling or blowing snow. A winter storm warning can cover other significant winter hazards without those blizzard conditions. The tool shows a blizzard warning under its own name if one is returned for the location.
Can I check a full Canadian postal code?
You can enter a full code, but this version uses its first three characters to find an approximate postal-area location. It does not locate your exact address or verify the complete six-character code. Check the returned place and affected area, especially if your postal area spans several communities.
Why does another weather app show a different alert?
First compare the selected location, issue time and alert name. One service may use your precise device location while this checker uses an approximate postal location. Updates and cancellations can also reach services at different times. Use the latest applicable bulletin from the issuing agency to resolve a discrepancy.
Do the results update automatically?
No. Select “Check alerts” again to request an updated result. The tool may reuse an alert response retrieved within the previous minute and marks displayed results as old after two minutes. It is a lookup service, not a push-notification or emergency-alert subscription.
About This Checker and Its Sources
Snow-Calculator.com displays US alerts from the National Weather Service and Canadian alerts from Environment and Climate Change Canada. Approximate postal locations come from GeoNames-derived data through Zippopotam.us. Each returned alert identifies its source and provides a link for checking the official information.
The tool does not issue warnings or calculate its own warning thresholds. It checks the returned bulletins for relevant winter hazards and excludes expired or cancelled alerts when that status is available. Source outages, location-database gaps and update delays can affect results. Use the issuing agency’s latest guidance for weather decisions and your district’s own announcement for school closures.