GYX Winter Weather Forecasts

Low End Amount – 9 in 10 Chance (90%) of Higher Snowfall

This map depicts a reasonable lower-end snowfall amount for the time period shown on the graphic, based on many computer model simulations of possible snowfall totals. This lower amount is an unlikely scenario with a 9 in 10, or 90% chance that more snow will fall, and only a 1 in 10, or 10% chance that less snow will fall. This number can help serve as a lower-end scenario for planning purposes.

Expected Snowfall - Official NWS Forecast

This map is the official NWS snowfall forecast in inches during the time period shown on the graphic. This snowfall amount is determined by NWS forecasters to be the most likely outcome based on evaluation of data from computer models, satellite, radar, and other observations.

High End Amount – Only a 1 in 10 Chance (10%) of Higher Snowfall

This map depicts a reasonable upper-end snowfall amount for the time period shown on the graphic, based on many computer model simulations of possible snowfall totals. This higher amount is an unlikely scenario, with only a 1 in 10, or 10% chance that more snow will fall, and a 9 in 10, or 90% chance that less snow will fall. This number can help serve as an upper-end scenario for planning purposes.

Most Likely Ice Accumulation

Represents our official ice forecast in inches within the next one to three days. The ice accumulation amounts are provided in ranges.

Precipitation Onset

Most likely time of precipitation onset (rain, snow, sleet, freezing rain).This information is provided when we issue a Warning or Advisory for expected snow or ice accumulation; typically six to 24 hours in advance.

Precipitation End Time

Most likely time of precipitation ending (rain, snow, sleet, freezing rain).This information is provided when we issue a Warning or Advisory for expected snow or ice accumulation; typically six to 24 hours in advance.

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