Extreme Cold Product - Experiment

...Use of Experimental Extreme Cold Watch and Extreme Cold Warning by National Weather Service Bismarck...


...National Weather Service is not eliminating the use of Wind

Chill and will still report and forecast Wind Chill Factor...


For the 2011-2012 winter season, NWS (National Weather Service)

offices in the Dakotas and Minnesota will participate in an experiment issuing extreme cold watches and extreme cold

warnings in place of wind chill watches and wind chill warnings. The NWS will still report what the wind chill factor is. This will be done, as always, along with other current conditions like temperature, humidity, and barometric pressure. We will also still forecast what the wind chill is expected to be. Wind chill will be included in the daily weather forecast, as always.


The change comes with respect to watches and warnings. Extreme cold watches and warnings will be issued in place of wind chill watches and warnings, and will account for dangerously cold

conditions, whether it is dangerously cold because of temperature and wind, or dangerously cold because of temperature with little or no wind.


For west and central North Dakota, extreme cold will be defined

as, temperatures 30 below zero or colder, or a combination of temperature and wind that makes it feel like 30 below zero or colder, over a large geographical area, and for at least several hours.


Extreme cold watch...will be issued a day or two before extreme cold conditions are possible.


Extreme cold warning...will be issued up to a day before extreme cold conditions are expected.


Comments through the winter season can be submitted to...




or, contact john.paul.martin@noaa.gov or at 701-250-4495.

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