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Jump to: Switch Office 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
High End Amount 1 in 10 Chance (10%) of Higher Snowfall
Low End Amount 9 in 10 Chance (90%) of Higher Snowfall
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 - Leave feedback Click here for more information on these products
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"
Snowfall Totals by Location Experimental - Leave feedback Click here for more information on these products
Snowfall Totals by Location These tables show the snowfall forecast for individual locations, and provide the same information as the graphics on this web page, just shown in a different way. All of these values are valid for the same time period as depicted on the graphics.
Location
Low-End
Snow Amount Potential
Experimental - Leave feedback Click here for more information on these products Click here for the NWS Probabilistic Precipitation Portal
High End Amount 1 in 10 Chance (10%) of Higher Snowfall
Low End Amount 9 in 10 Chance (90%) of Higher Snowfall
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 - Leave feedback Click here for more information on these products
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"
Ice Accumulation Potential
Experimental - Leave feedback Click here for more information on these products Click here for the NWS Probabilistic Precipitation Portal
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 Amount1 in 10 Chance (10%) of Higher Ice Accumulation
Low End Amount 9 in 10 Chance (90%) of Higher Ice Accumulation
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... Experimental - Leave feedback Click here for more information on these products
Percent Chance That Ice Accumulation Will Be Greater Than This series of maps shows the probability (that is, the likelihood) that ice accumulation 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. >=0.01"
>=0.1"
>=0.25"
>=0.5"
>=0.75"
>=1"
>=1.25"
>=1.5"
Ice Accumulation by Location Experimental - Leave feedback Click here for more information on these products
Ice Accumulation Totals by Location These tables show the ice accumulation forecast for individual locations, and provide the same information as the graphics on this web page, just shown in a different way. All of these values are valid for the same time period as depicted on the graphics.
Location
Low-End
Ice Accumulation Potential
Experimental - Leave feedback Click here for more information on these products Click here for the NWS Probabilistic Precipitation Portal
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 Amount1 in 10 Chance (10%) of Higher Ice Accumulation
Low End Amount 9 in 10 Chance (90%) of Higher Ice Accumulation
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 Accumulations Will Be Greater Than... Experimental - Leave feedback Click here for more information on these products
Percent Chance That Ice Accumulations Will Be Greater Than This series of maps shows the probability (that is, the likelihood) that ice accumulation 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 ice accumulation totals. Hover over thumbnails below to view larger image. >=0.01"
>=0.1"
>=0.25"
>=0.5"
>=0.75"
>=1"
>=1.25"
>=1.5"
Precipitation Onset/End Timing
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.
Winter Storm Severity Index (WSSI)
Winter Storm Outlook (WSO)
Local Snow Reports
National Snowfall Analysis
Days 4-7 Winter Weather Outlook
Day 6 Winter Weather Outlook Day 7 Winter Weather Outlook
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
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