Blizzard Warning: Meaning, Origin & Winter Safety Guide
Quick Definition (Meteorology & Weather Alerts)
An urgent National Weather Service alert issued when sustained winds or frequent gusts of 35 mph or greater combine with falling or blowing snow to reduce visibility to 1/4 mile or less for at least 3 consecutive hours.
Also called: blizzard alert, severe blizzard, blizzard criteria
If you only do three things
- Cancel all travel once a Blizzard Warning takes effect — road rescues may be impossible.
- Prepare your One Warm Room and check carbon monoxide detector batteries.
- Keep pets indoors and check exterior heating vents for drifting snow.
Origin, meteorology & what "Blizzard Warning" means
Originally an 1800s American slang word for a sharp blow or volley of cannon fire, an Estherville, Iowa newspaper first applied 'blizzard' to a fierce March 1870 snowstorm, and the U.S. Weather Bureau soon adopted it officially.
Crucially, a blizzard is defined by wind speed (35+ mph) and low visibility (<= 1/4 mile for 3+ hours), NOT by how many inches of snow fall or how cold the thermometer gets.
Real-world winter safety & what to do
When a Blizzard Warning is issued for your county, treat it as a shelter-in-place order: highways frequently close, emergency ambulances and tow trucks may be suspended, and stranded motorists face life-threatening hypothermia.
Ensure you have 72 hours of non-perishable food, drinking water, prescription medications, and battery-powered lighting before the wind ramps up.
Frequently asked questions about Blizzard Warning
Does it have to snow a foot to be a blizzard?
No. Even 2 inches of powdery snow whipped by 40 mph winds for 3 hours qualifies as a full blizzard if visibility stays at or below 1/4 mile.
What is the difference between a Winter Storm Warning and a Blizzard Warning?
A Winter Storm Warning means heavy snow, sleet, or ice is imminent; a Blizzard Warning specifically adds 35+ mph winds and <1/4 mile visibility for 3+ hours.
Related situational guides
- Watches & Warnings Explained: Plain-English breakdown of every NWS winter alert.
- 48-Hour Storm Countdown: What to do before a Blizzard Warning begins.
- 7-Day Home & Car Winter Supplies: Interactive checklist for sheltering through a blizzard.