Gray - Portland, ME

Weather Forecast Office

GYX Winter Weather Forecasts

Probabilistic Snowfall Forecasts
Ice Accumulation Forecasts
Cumulative Snowfall
Weather Type Forecast
Other Snow/Ice Information
Long-Range Forecast
Daily Snowfall Maps
Other Winter Links

Probabilistic snowfall forecasts have been suspended for the season. Check back around October 1st for updated information. Snow Amount Potential Experimental - Leave feedback
Expected Snowfall - Official NWS Forecast Point Range 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.

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Percent Chance That Snow Amounts Will Be Greater Than...

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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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Snowfall Totals by Location

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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.

Switch to: Range Exceedance

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Page Last Updated: 04:02 PM EDT Jul 20, 2018

Expected Ice Accumulation - Official NWS Forecast
Ice Accumulation Potential
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.

Onset of Wintry Precipitation	End Timing of Wintry Precipitation
Other Snow/Ice Information

What's this?	What's this?
Storm Track	Reported Snow/Ice Totals

What's this?	What's this?
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. Precipitation End Time Most likely time of winter precipitation ending (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. 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. 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. 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 6-10
Temperature	Precipitation


Days 8-14
TEMPERATURE	PRECIPITATION


Week 3-4
TEMPERATURE	PRECIPITATION

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	National Forecast Maps	Winter Weather Maps
* 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

Satellite Imagery

Current Obs

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	Regional Maps	National Maps
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