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
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.skywarn@noaa.gov or Tweet to @NWSGray), we will pass them on here. They will be collected and we will build a map our of them that we will post here.

 

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

 

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

 

 

From the Northeast River Forecast Center


Northeast Daily Snowfall

Northeast Daily Snow Depth

>

From the National Operational Hydrologic Remote Sensing Center


New Hampshire and Western Maine
Snow Depth

New Hampshire and Western Maine
Snow Water Equivalent

Forecast Information for Preparation and Planning

 
Graphical Forecast
NDFD Forecast
 
National Forecast Maps
WPC Winter Forecast
 
Winter Weather Maps
WPC Winter Forecast
* For point specific forecasts, please return to the main page and see the map there.

Narrative Discussions
Area Forecast Discussion - Portland | Caribou | Boston | Burlington

National Forecast Discussions (national in scope)

Text Forecast Products
Point Forecast for selected Cities - Portland | Caribou | Boston | Burlington
Area Forecast for selected Zones (tabular) - Portland | Caribou | Boston | Burlington

Current Conditions and Information for Ongoing Storms

 
Northeast Radar
Northeast Radar
 
Satellite Imagery
Satellite Image
 
Current Obs
Satellite Image



Most Recent Storm Reports - PNS Product
Rain, Snow and Ice Reports - Portland | Caribou | Boston | Burlington

Most Recent Storm Reports - LSR Product
Rain, Snow and Ice Reports - Portland | Caribou | Boston | Burlington

Local/Regional Satellite
New England Sector GOES Satellite Imagery - NOAA NESDIS
Polar Orbit Imagery - NASA (not always available for NE U.S.)

Local/Regional Radar
Boston,MA Radar - NWS
Boston-Logan Airport Radar - FAA
Caribou, Maine Radar - NWS
Portland, Maine Radar - NWS
Northeast Regional Radar - NWS

Surface Analysis Maps
New England Surface Analysis (fronts and pressure) - NWS
Other U.S. Surface Analysis Maps (with help pages on symbols) - NWS

Weather Calculators
Wind Chill Calculator and Information

Post Event Information

 
Latest Observed Snowfall
Latest Observed Storm Total Snow
 
Regional Maps
Storm Total Snow Forecast
 
National Maps
Storm Total Snow Forecast
Local Data...

Most Recent Storm Reports
Rain, Snow and Ice Reports - Portland | Caribou | Boston | Burlington
Storm Damage and Impact Reports - Portland | Caribou | Boston | Burlington
CoCoRaHS Daily Precipitation Summary - Portland
Daily Hydrologic Observations - Portland | Caribou | Boston | Burlington

*Local Storm Reports and Public Information Statements will contain a summary information for short period of time after a storm.

 
Observed Precipitation and Snowfall Graphics

Local Archive Maps and Text Products

Northeast Current 24-hour Snowfall Map (Updated Daily)
Northeast One Week Archive of Daily Snowfall Maps (Updated Daily)
Northeast Current Snow Depth Map (Updated Daily)
Northeast One Week Archive of Daily Snow Depth Maps (Updated Daily)

Liquid or Liquid Equivalent Precipitation Graphics
Northeast Current 24-hour Liquid Precipitation Map (Updated Daily)
Northeast One Week Archive of Liquid Precipitation Map (Updated Daily)
Northeast Current Snow Depth Map (Updated Daily)
Northeast One Week Archive of Daily Snow Depth Maps (Updated Daily)
 

Other Data and Graphics
National Operational Hydrologic Remote Sensing Center (NOHRSC) -site for archive data