National Weather Service United States Department of Commerce

Snow Amount Potential
Experimental -
 
Expected Snowfall - Official NWS Forecast
Point Range
Official NWS Forecast Snow Totals
What's this?
High End Amount
1 in 10 Chance (10%) of Higher Snowfall

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

Minimum Potential Snow Accumulation
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"
>=0.1"
>=1"
>=1"
>=2"
>=2"
>=4"
>=4"
>=6"
>=6"
>=8"
>=8"
>=12"
>=12"
>=18"
>=18"
Probability Graphic

Snowfall Totals by Location
Experimental -
 
What's this?

Snowfall Totals by Location

 

These tables show the snowfall forecast for individual locations. The tables provide the same information as the maps on this web page, just shown in a different way. The "Exceedance" option shows the chance that snow will exceed a certain threshold. The "Range" option shows the likelihood of snowfall being within a certain range. All of these values are valid for the same time period as depicted on the graphics.

County:
 
Switch to: Range Exceedance
Ice Accumulation Potential
 
Expected Ice Accumulation - Official NWS Forecast
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.

Other Snow/Ice Information
Storm Track Onset of Wintry Precipitation Reported Snow/Ice Totals
Storm Total Ice Graphic
Winter Precipitation Onset
Latest snow report
What's this? What's this? What's this?

Low Tracks Graphic

The graphic depicts the forecast location of significant surface lows impacting the 48 contiguous United States in 12 hour increments out to 72 hours into the future.

The low position and track forecast by NCEP WPC meteorologist is in white. Each low position is accompanied by a lead time (Eastern Time). The circles around each low represents a 75% probability the observed low will be located with the circle. Note: The probability is derived using previous season's verification data. For reference, existing surface lows are depicted with a red marker without yellow circles.

Precipitation Onset

Most likely time of winter precipitation onset (snow, sleet, freezing rain). Rain is not included here. This information is provided when we issue a Warning or Advisory for expected snow or ice accumulation; typically six to 24 hours in advance. Times are only given for places that are under a Warning or Advisory. They will be blank in areas outside Warnings or Advisories.

Reported

As snow and/or ice reports come into the NWS (you can email reports to gyx.webmaster@noaa.gov or Tweet to @NWSGray), we will pass them on here. With the map linked here, and the supporting reports below it, you can keep tabs on how much has fallen.

 

Gray, ME Products
HAZARDOUS WEATHER OUTLOOK FORECAST DISCUSSION SPECIAL WEATHER STATEMENT PUBLIC INFORMATION STATEMENT
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