Winter Weather/Probabilistic Snow Forecasts

Winter Weather Headlines Issued for First Snow Event of the Season

A blast of Arctic air tonight into Monday will usher a changeover from rain to snow for the start of the new week. In the mountains, a winter storm warning has been issued where 4–6” of snow with local higher amounts will be. A winter weather advisory has been issued for 2-4" across portions of the lowlands and mountains. 1-2" of snowfall is expected elsewhere across the lowlands. Read More >

>=0.1"

>=1"

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>=6"

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>=12"

>=18"

>=0.1"

>=1"

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>=6"

>=8"

>=12"

>=18"

Ice Accumulation Potential Experimental - Leave feedback Click here for more information on these products Click here for the NWS Probabilistic Precipitation Portal
Expected Ice Accumulation - Official NWS Forecast What's this? This is the elevated flat surface ice accumulation. It is not radial/line ice. Radial/line ice is typically 39% of the elevated flat surface ice. For more information on this, see this module.	High End Amount 1 in 10 Chance (10%) of Higher Ice Accumulation What's this?
	Low End Amount 9 in 10 Chance (90%) of Higher Ice Accumulation What's this?
Low End Amount – 9 in 10 Chance (90%) of Higher Ice Accumulation This map depicts a reasonable lower-end ice accumulation amount for the time period shown on the graphic, based on many computer model simulations of possible ice accumulation 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 Ice Accumulation - Official NWS Forecast This map is the official NWS ice accumulation forecast in inches during the time period shown on the graphic. This ice accumulation 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 Ice Accumulation This map depicts a reasonable upper-end ice accumulation amount for the time period shown on the graphic, based on many computer model simulations of possible ice accumulation 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 ice accumulation products is to provide customers and partners a range of ice accumulation possibilities, in complement to existing NWS deterministic ice accumulation 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 Ice Accumulation Will Be Greater Than...

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Hover over thumbnails below to view larger image.

>=0.01"	>=0.1"	>=0.25"	>=0.5"	>=0.75"	>=1"	>=1.25"	>=1.5"

Ice Accumulation 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

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

This map depicts a reasonable lower-end ice accumulation amount for the time period shown on the graphic, based on many computer model simulations of possible ice accumulation 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 Ice Accumulation - Official NWS Forecast

This map is the official NWS ice accumulation forecast in inches during the time period shown on the graphic. This ice accumulation 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 Ice Accumulation

This map depicts a reasonable upper-end ice accumulation amount for the time period shown on the graphic, based on many computer model simulations of possible ice accumulation 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.

>=0.01"

>=0.1"

>=0.25"

>=0.5"

>=0.75"

>=1"

>=1.25"

>=1.5"

Precipitation Onset/End Timing
Onset of Wintry Precipitation	End Timing of Wintry Precipitation

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.

Precipitation Onset/End Timing

Onset of Wintry Precipitation

End Timing of Wintry Precipitation

What's this?

Winter Storm Severity Index (WSSI)

Winter Storm Outlook (WSO)

Local Snow Reports

National Snowfall Analysis

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.

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.

Days 4-7 Winter Weather Outlook

Day 4 Winter Weather Outlook	Day 5 Winter Weather Outlook


Day 6 Winter Weather Outlook	Day 7 Winter Weather Outlook

Click here for an interactive map

CPC Week-2 Experimental Heavy Snow Risk



CPC Temperature & Precipitation Maps

Days 6-10
Temperature	Precipitation



Days 8-14
TEMPERATURE	PRECIPITATION



Week 3-4
TEMPERATURE	PRECIPITATION


Interstate 64 Huntington to White Sulphur Springs	Interstate 68 Morgantown to Hazelton	Interstate 77 Bluefield to Parkersburg	Interstate 79 Charleston to Morgantown	Interstate 81 Ridgeway to Marlowe

US Route 33 Ravenswood to High Knob	US Route 50 Parkersburg to Capon Bridge	US Route 219 Rich Creek to Silver Lake


Interstate 64 Huntington to White Sulphur Springs	Interstate 68 Morgantown to Hazelton	Interstate 77 Bluefield to Parkersburg	Interstate 79 Charleston to Morgantown	Interstate 81 Ridgeway to Marlowe

US Route 33 Ravenswood to High Knob	US Route 50 Parkersburg to Capon Bridge	US Route 219 Rich Creek to Silver Lake

Winter Weather Headlines Issued for First Snow Event of the Season

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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

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

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

Expected Ice Accumulation - Official NWS Forecast

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

Percent Chance That Ice Accumulation Will Be Greater Than

Ice Accumulation Totals by Location

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

Expected Ice Accumulation - Official NWS Forecast

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

Percent Chance That Ice Accumulations Will Be Greater Than

Precipitation Onset

Precipitation End Time

Interstate 64

Interstate 68

Interstate 77

Interstate 79

Interstate 81

US Route 33

US Route 50

US Route 219

Interstate 64

Interstate 68

Interstate 77

Interstate 79

Interstate 81

US Route 33

US Route 50

US Route 219