National Weather Service United States Department of Commerce

Tracking Late December Winter Storm Expected to Impact the Northern Plains through the Northeast U.S.

A winter storm system will rapidly intensify over the Midwest on Sunday and track through the Great Lakes on Monday. Periods of heavy snow are anticipated across the Upper Great Lakes late Sunday and continuing into Monday. At least 1/10 inch of ice accumulation is expected from a wintry mix across much of the interior Northeast U.S. starting Sunday afternoon. Read More >

Denver/Boulder, CO

Weather Forecast Office

BOU Winter Weather Forecasts

Weather.gov > Denver/Boulder, CO > BOU Winter Weather Forecasts

Snow Amount Potential
Experimental -
Expected Snowfall - Official NWS Forecast
 

What's this?		 High End Amount
1 in 10 Chance (10%) of Higher Snowfall

What's this?
Low End Amount
9 in 10 Chance (90%) of Higher Snowfall

What's this?

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.
 
The purpose of these experimental probabilistic snowfall products is to provide customers and partners a range of snowfall possibilities, in complement to existing NWS deterministic snowfall graphics, to better communicate forecast uncertainties during winter weather events. For more information visit this project's Product/Service Description Document, and please provide us your feedback here.
Percent Chance That Snow Amounts Will Be Greater Than...
Experimental -
What's this?

Percent Chance That Snow Amounts Will Be Greater Than

 

This series of maps shows the probability (that is, the likelihood) that snowfall will equal or exceed specific amounts during the time period shown on the graphic. These forecasts are based on many computer model simulations of possible snowfall totals.
Hover over thumbnails below to view larger image.
>=0.1"
>=1"
>=2"
>=4"
>=6"
>=8"
>=12"
>=18"

Snowfall Totals by Location
Experimental -
What's this?

Snowfall Totals by Location

 

These tables show the snowfall forecast for individual locations, and provide the same information as the graphics on this web page, just shown in a different way. All of these values are valid for the same time period as depicted on the graphics.

 

 

Denver Metro

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Adams County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Arapahoe County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Boulder County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Broomfield County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Clear Creek County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Denver County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Douglas County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Elbert County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Gilpin County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Grand County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Jackson County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Jefferson County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Larimer County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Lincoln County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Logan County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Morgan County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Phillips County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Park County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Sedgwick County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Summit County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Washington County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

Weld County

Location Low-End
Amount		 Expected
Amount		 High-End
Amount		 Chance of Seeing More Than

 

 
Ice Accumulation Potential
 

Expected Ice Accumulation - Official NWS Forecast

This is the elevated flat surface ice accumulation. It is not radial/line ice. Radial/line ice is typically 39% of the elevated flat surface ice. For more information on this, see this module.
Most Likely Ice Accumulation

What's this?

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.
Winter Storm Severity Index (WSSI) Winter Storm Outlook (WSO)
Winter Storm Severity Index
Winter Storm Outlook
National Snow Reports National Snowfall Analysis
National Snow Reports
National Snowfall Analysis
 
Local Snow Reports
Days 4-7 Winter Weather Outlook
 
Day 4 Winter Weather Outlook Day 5 Winter Weather Outlook
Day 4 Winter Weather Outlook Day 5 Winter Weather Outlook
 
Day 6 Winter Weather Outlook Day 7 Winter Weather Outlook
Day 6 Winter Weather Outlook Day 7 Winter Weather Outlook


Click here for an interactive map
 
CPC Week-2 Experimental Heavy Snow Risk
 
CPC Week-2 Experimental Heavy Snow Risk
 
CPC Temperature & Precipitation Maps
 

Days 6-10
Temperature  Precipitation
6-10 day temperature 6-10 day precipitation
 
 

Days 8-14
TEMPERATURE  PRECIPITATION
8-14 day temperature 8-14 day precipitation
 
 

Week 3-4

TEMPERATURE

PRECIPITATION
Week 3-4 Temperature Week 3-4 precipitation
Snow Amount Potential
Experimental -
Expected Snowfall - Official NWS Forecast
 

What's this?		 High End Amount
1 in 10 Chance (10%) of Higher Snowfall

What's this?
Low End Amount
9 in 10 Chance (90%) of Higher Snowfall

What's this?

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.
 
The purpose of these experimental probabilistic snowfall products is to provide customers and partners a range of snowfall possibilities, in complement to existing NWS deterministic snowfall graphics, to better communicate forecast uncertainties during winter weather events. For more information visit this project's Product/Service Description Document, and please provide us your feedback here.
Percent Chance That Snow Amounts Will Be Greater Than...
Experimental -
What's this?

Percent Chance That Snow Amounts Will Be Greater Than

 

This series of maps shows the probability (that is, the likelihood) that snowfall will equal or exceed specific amounts during the time period shown on the graphic. These forecasts are based on many computer model simulations of possible snowfall totals.
Hover over thumbnails below to view larger image.
>=0.1"
>=1"
>=2"
>=4"
>=6"
>=8"
>=12"
>=18"
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