Snow and Ice Forecasts & Services

Atmospheric River to Impact the Northwest; Windy Conditions in the Northeast

A strong atmospheric river moving into northern California later today will bring a threat for moderate to heavy rainfall and flooding, gusty to high winds, and mountain snows for parts of the Northwest U.S. through Wednesday. Gusty winds and isolated showers are expected today in the Northeast U.S. behind a cold front. Wind Advisories have been issued. Read More >

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Snow Amount Potential Graphics
Snow Amount Exceedance Graphics
Snowfall Totals by Location

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Snow Amount Potential Experimental - Leave feedback Click here for more information on these products Click here for the NWS Probabilistic Precipitation Portal
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...

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>=0.1"	>=1"	>=2"	>=4"	>=6"	>=8"	>=12"	>=18"

Snowfall Totals by Location

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

Ice Accumulation Potential
Expected Ice Accumulation - Official NWS Forecast
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.

Ice Accumulation Potential

Expected Ice Accumulation - Official NWS Forecast

What's this?

>=0.1"

>=1"

>=2"

>=4"

>=6"

>=8"

>=12"

>=18"

Other Snow/Ice Information
Observed Snow/Ice Amounts	Winter Storm Severity Index

What's this?	What's this?
Reported Snow and Ice As snow and/or ice reports come into the NWS we consolidate and post them here. You can email reports to lwx-report@noaa.gov or X to @NWS_BaltWash. With the map linked here, and the supporting reports listed below it, you can keep tabs on how much has fallen. Note you can toggle between mapping snow and ice reports using the drop down menu just above the map. Winter Storm Severity Index The purpose of the Winter Storm Severity Index (WSSI) is to provide NWS partners and the general public with an indication of the level of winter precipitation (snow and ice) severity and its potential related societal impacts.

Other Snow/Ice Information

Observed Snow/Ice Amounts

Winter Storm Severity Index

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Onset/End of Wintry Precipitation
Onset of Wintry Precipitation (For areas under Warning or Advisory)	End of Wintry Precipitation (For areas under Warning or Advisory)

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 for all areas in the forecast area with greater than/equal to 0.1” of snow or 0.01” of ice forecast when a Winter Storm Warning or Winter Weather Advisory is in effect for any part of the forecast area; typically six to 24 hours in advance. Times will be blank for areas with less than 0.1” of snow or 0.01” of ice forecast. Precipitation End Time Most likely time that the accumulating winter precipitation ends (snow, sleet, freezing rain). This information is provided for all areas in the forecast area with greater than/equal to 0.1” of snow or 0.01” of ice forecast when a Winter Storm Warning or Winter Weather Advisory is in effect for any part of the forecast area; typically six to 24 hours in advance. Times will be blank for areas with less than 0.1” of snow or 0.01” of ice forecast.

Onset/End of Wintry Precipitation

Onset of Wintry Precipitation
(For areas under Warning or Advisory)

End of Wintry Precipitation
(For areas under Warning or Advisory)

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 for all areas in the forecast area with greater than/equal to 0.1” of snow or 0.01” of ice forecast when a Winter Storm Warning or Winter Weather Advisory is in effect for any part of the forecast area; typically six to 24 hours in advance. Times will be blank for areas with less than 0.1” of snow or 0.01” of ice forecast.

Precipitation End Time

Most likely time that the accumulating winter precipitation ends (snow, sleet, freezing rain). This information is provided for all areas in the forecast area with greater than/equal to 0.1” of snow or 0.01” of ice forecast when a Winter Storm Warning or Winter Weather Advisory is in effect for any part of the forecast area; typically six to 24 hours in advance. Times will be blank for areas with less than 0.1” of snow or 0.01” of ice forecast.

Day 3

Day 4

Day 5

Day 6

Day 7

High	High threat of high impact winter storm. Potential impacts include significant travel delays, closures, and threats to life and property. Plan ahead to minimize impact on you and your family.
Moderate	Moderate winter storm threat. Potential impacts include significant travel delays and closures. Plan ahead to minimize impact on you and your family.
Enhanced	Enhanced winter storm threat. Increased potential of more significant travel impacts and more closures.
Slight	Slight winter storm threat. If threat materializes, may cause travel disruptions.
None	No significant winter storm threat is currently expected. However, light wintry precipitation may still be possible.

High

High threat of high impact winter storm. Potential impacts include significant travel delays, closures, and threats to life and property. Plan ahead to minimize impact on you and your family.

Moderate

Moderate winter storm threat. Potential impacts include significant travel delays and closures. Plan ahead to minimize impact on you and your family.

Enhanced

Enhanced winter storm threat. Increased potential of more significant travel impacts and more closures.

Slight

Slight winter storm threat. If threat materializes, may cause travel disruptions.

None

No significant winter storm threat is currently expected. However, light wintry precipitation may still be possible.

Winter Storm Severity Index (WSSI)

Winter Storm Outlook (WSO)

Useful Winter Weather Information
Historic Mid-Atlantic Winter Storms	Winter/Snowfall Statistics	El Niño and DC/Baltimore Winters
Watches, Warnings, & Advisories	How to Measure Snow	La Niña and DC/Baltimore Winters
BE PREPARED!
At Home	On the Road	Outside in the Cold

Long-Range Forecast

Days 4-7
Day 4 Winter Weather Outlook	Day 5 Winter Weather Outlook


Day 6 Winter Weather Outlook	Day 7 Winter Weather Outlook


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

Atmospheric River to Impact the Northwest; Windy Conditions in the Northeast

Snow and Ice Forecasts & Services

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Low End Amount – 9 in 10 Chance (90%) of Higher Snowfall

Expected Snowfall - Official NWS Forecast

High End Amount – Only a 1 in 10 Chance (10%) of Higher Snowfall

Percent Chance That Snow Amounts Will Be Greater Than

Snowfall Totals by Location

Most Likely Ice Accumulation

Low End Amount – 9 in 10 Chance (90%) of Higher Snowfall

Expected Snowfall - Official NWS Forecast

High End Amount – Only a 1 in 10 Chance (10%) of Higher Snowfall

Percent Chance That Snow Amounts Will Be Greater Than

Reported Snow and Ice

Winter Storm Severity Index

Precipitation Onset

Precipitation End Time