National Weather Service United States Department of Commerce
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.

 

Snow Accumulation Potential
Experimental -
 
EXPECT AT LEAST THIS MUCH MOST LIKELY SNOWFALL POTENTIAL FOR THIS MUCH
   
Minimum Potential Snow Accumulation
Most Likely Snow Accumulation (Point)Most Likely Snow Accumulation (Range)
Maximum Potential Snow Accumulation
What's this? What's this? What's this?

Minimum Potential Accumulation

Expect at least this much. This is what we see as the least amount of snow the storm can produce.

This information is for advance planning ahead of the storm. It is provided out as far as three days. However, when the snow starts to fall, this will be discontinued to focus on the forecast snow amount.
 

Most Likely Snow Accumulation

Represents our official snow forecast in inches within the next one to three days. The snowfall amounts are provided in point (single number) and ranges (1-2", 2-4", etc.). You can toggle between the two by hovering over the "Point" and "Range" text above the image. The point amount is our forecast but the range for the "most likely" represents the forecast uncertainty in predefined ranges.

Maximum Potential Accumulation

What you should be prepared for. This is what we see as the storm's maximum potential snowfall accumulation.

This information is for advance planning ahead of the storm. It is provided out as far as three days. However, when the snow starts to fall, this will be discontinued to focus on the forecast snow amount.

 

Ice Accumulation Potential
 
  MOST LIKELY ICE GLAZE  
  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.

 

Percent Chance That Snow Accumulation Will Be Greater Than...
Experimental -
 
What's this?

Exceedance Probabilities

Represents the likelihood of exceeding a specific snowfall amount. Thresholds are 0.1", 1", 2", 4", 6", 8", 12", and 18". This product is designed to indicate high or low confidence in the official snowfall forecast.

Example: An 80% chance of exceeding 2" means that we have a high confidence that it will snow at least 2". Conversely, a 10% chance of exceeding 18" means that we have high confidence that it will snow less than 18".

Hover over thumbnails below to view larger image.
>=0.1"
>=0.1"
>=1"
>=1"
>=2"
>=2"
>=4"
>=4"
>=6"
>=6"
>=8"
>=8"
>=12"
>=12"
>=18"
>=18"

 

Chance of Snow Accumulation
Experimental -
 
What's this?

Snow Accumulation

Ranges

Represents the likelihood of various snowfall ranges. Amounts ranges are 0", 1-2", 2-4", 4-6", 6-8", 8-12", 12-18" and 18" +. This product is designed to indicate high or low confidence in the official snowfall forecast.

Exceedance

Represents the likelihood of exceeding a specific snowfall amount. Thresholds are 0.1", 1", 2", 4", 6", 8", 12", and 18". This product is designed to indicate high or low confidence in the official snowfall forecast.

County:
 

 

Other Snow/Ice Information
Onset Time Ending Time Reported Snow/Ice Totals
Onset Timing Graphic
Ending Timing Graphic
Latest snow reports
What's this? What's this? What's this?

Onset Time Graphic

This graphic depicts the approximate onset time for precipitation across the area.

Ending Time Graphic

This graphic depicts the approximate ending time for precipitation across the area.

Final Observed Storm Total Maps Seasonal and Monthly Snowfall Maps Precipitation Type Forecasts
Final Observed Storm Total Maps
Seasonal and Monthly Snowfall Maps
Precipitation Type Forecasts
What's this? What's this? What's this?

Final Observed Storm Total Maps

These graphics show the final observed storm totals, and are made after the event ends.

Seasonal and Monthly Snowfall Maps

These graphics show the observed seasonal and monthly snowfall, and are made just after the start of a month.

Precipitation Type Forecasts

These graphics show the forecast precipitation types for the next couple days. Loop or step forward in time to see all the images.

 

Long-Range Forecast
 
Days 4-5 Forecast Precipitation Days 6-7 Forecast Precipitation
Days 4-5 Precip Days 6-7 Precip
   

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

 

Products
HAZARDOUS WEATHER OUTLOOK FORECAST DISCUSSION SPECIAL WEATHER STATEMENT Local Storm Reports PUBLIC INFORMATION STATEMENT