Extreme Cold Warning vs Extreme Cold Watch vs Cold Weather Advisory

What each National Weather Service cold alert means, what happened to Wind Chill Warnings, and what a cold snap means for an HVAC or plumbing shop. ForecastBooked watches the forecast for every ZIP you serve and builds a ready-to-edit kit when a freeze is on the way.

Start my 14-day free trial

Free for 14 days. Card at checkout. Cancel before day 14 and pay nothing.

The cold alerts, lowest to highest

AlertWhat it meansNWS says
Cold Weather AdvisoryDangerously cold conditions that are not expected to reach warning criteria. Replaced the Wind Chill Advisory.Be aware.
Extreme Cold WatchExtremely dangerous cold or wind chill values are possible, but where and when is still uncertain. Replaced the Wind Chill Watch.Be prepared.
Extreme Cold WarningExtremely dangerous cold or wind chill values are expected or occurring. Replaced the Wind Chill Warning.Take action.

From the NWS page on understanding cold weather alerts and the NWS cold hazard simplification notice, read Oct 22, 2026. Exact criteria vary by local office.

What happened to Wind Chill Warnings

Since October 1, 2024, Wind Chill Watches are Extreme Cold Watches, Wind Chill Warnings are Extreme Cold Warnings, and Wind Chill Advisories are Cold Weather Advisories. The NWS said the change makes clear that cold can be dangerous with or without wind. NWS Amarillo explains the practical part: these alerts are now issued on the temperature or the wind chill, with no wind threshold. On Oct 22, 2026, the api.weather.gov alert list had Cold Weather Advisory, Extreme Cold Watch, Extreme Cold Warning, and no Wind Chill alerts.

How cold counts as extreme depends on where you are

Each local NWS office sets its own criteria. Two examples, read Oct 22, 2026:

  • NWS Baltimore/Washington (Sterling, VA), east of the Blue Ridge: a Cold Weather Advisory when the temperature or wind chill is expected to fall to 0 to -9°F, and an Extreme Cold Warning at -10°F or colder. West of and including the Blue Ridge the numbers are 10 degrees colder (-10 to -19°F and -20°F), with a few county exceptions listed by the office.
  • NWS Grand Forks, ND: a Cold Weather Advisory at -30°F or colder, and an Extreme Cold Warning at -40°F or colder.

So the same night can bring an Extreme Cold Warning to Virginia and nothing in North Dakota. If you serve ZIPs under two offices, expect different alerts for the same cold snap.

Not the same as a Freeze Warning

A Freeze Warning is about temperatures going below 32°F for a long period, and the NWS ties frost and freeze alerts to the local growing season. Cold Weather Advisories and Extreme Cold alerts are about dangerous cold for people, and they keep coming through the winter. More in Freeze Watch vs Freeze Warning vs Frost Advisory.

What it means for an HVAC or plumbing shop

An Extreme Cold Watch is the earlier alert: the cold is possible, but the timing is still uncertain. That is when customers still have time to book a furnace check or ask how to protect pipes in an unheated crawl space or garage. Once a warning is out, the NWS advice is to avoid going outside, so your message shifts to staying safe and how to reach you if the heat goes out.

How ForecastBooked handles it

  • Every 3 hours we check the NWS forecast and active alerts for each ZIP you serve.
  • Cold Weather Advisories and Extreme Cold alerts don't start a kit.
  • The freeze kits run on the forecast: a first-freeze kit on the first forecast night of the season at 32°F or colder, and a hard-freeze kit on a forecast low of 28°F or colder. A real cold snap gets there either way.
  • ForecastBooked builds a ready-to-edit kit on your private kit page: a customer email, a text script, a Google post and a social post. You check it and send it to your own opted-in customers.
  • Plans are $19, $39, $79 a month by number of ZIPs, after a 14-day free trial. See how triggers work.

Questions

What is the difference between an Extreme Cold Warning and a Cold Weather Advisory?
A Cold Weather Advisory is for dangerously cold conditions that are not expected to reach warning criteria. An Extreme Cold Warning is for extremely dangerous cold or wind chill values that are expected or occurring. The NWS puts it as be aware for the advisory, and take action for the warning.
What is the difference between an Extreme Cold Watch and an Extreme Cold Warning?
A watch means extremely dangerous cold is possible, but the timing or location is still uncertain. A warning means it is expected or already happening.
What happened to Wind Chill Warnings?
Since October 1, 2024, Wind Chill Watches are Extreme Cold Watches, Wind Chill Warnings are Extreme Cold Warnings, and Wind Chill Advisories are Cold Weather Advisories. The NWS said the change makes clear that cold can be dangerous with or without wind.
How cold does it have to be for an Extreme Cold Warning?
It depends on your local NWS office. NWS Baltimore/Washington issues one east of the Blue Ridge when the temperature or wind chill is expected to reach -10°F or colder. NWS Grand Forks, ND uses -40°F or colder.
Is an Extreme Cold Warning the same as a Freeze Warning?
No. Freeze Warnings are about temperatures going below 32°F for a long period, and they are issued only until the end of the local growing season (NWS Baltimore/Washington marks that end by the first widespread freeze). Cold Weather Advisories and Extreme Cold alerts are about dangerous cold for people, and they are issued through the winter.
Do cold alerts start a ForecastBooked kit?
No. Cold Weather Advisories and Extreme Cold alerts don't start a kit. The freeze kits run on the forecast instead: a first-freeze kit on the first forecast night of the season at 32°F or colder, and a hard-freeze kit on a forecast low of 28°F or colder. ForecastBooked builds a ready-to-edit kit; you send it to your own opted-in customers.

Other NWS alerts: Freeze Watch vs Freeze Warning vs Frost Advisory · Winter Storm Watch vs Warning vs Winter Weather Advisory.

Sources