The National Digital Forecast Database (NDFD) contains a mosaic of digital forecasts from the National Weather Service (NWS) field offices working in collaboration with NCEP. The forecasts depicted on the previous page — and in the example below — combine WPC forecasts of fronts, isobars and high/low pressure centers with the NDFD depiction of expected weather type. Below is a brief explanation of the depicted weather types.

• NDFD Rain (Chance) - There is chance of measurable rain (≥0.01") at the valid time.
• NDFD Rain (Likely) - Measurable rain (≥0.01") is likely at the valid time.
• NDFD Snow (Chance) - There is chance of measurable snowfall (≥0.01" liquid equivalent) at the valid time.
• NDFD Snow (Likely) - Measurable snow (≥0.01" liquid equivalent) is likely at the valid time.
• NDFD Mix (Chance) - There is a chance of measurable mixed precipitation (≥0.01" liquid equivalent) at the valid time.  "Mixed" can refer to precipitation where a combination of rain and snow, rain and sleet, or snow and sleet are forecast.
• NDFD Mix (Likely) - Measurable mixed precipitation (≥0.01" liquid equivalent) is likely at the valid time.  "Mixed" can refer to precipitation where a combination of rain and snow, rain and sleet, or snow and sleet are forecast.
• NDFD Ice (Chance) - There is a chance of measurable sleet and/or freezing rain (≥0.01" liquid equivalent) at the valid time.
• NDFD Ice (Likely) - Measurable sleet and/or freezing rain (≥0.01" liquid equivalent) is likely at the valid time.
• NDFD T-Storm (Chance) - There is a chance of thunderstorms at the valid time.   Areas are displayed with diagonal hatching enclosed in a dark red border.
• NDFD T-Storm (Likely and/or Severe) - Thunderstorms are likely and/or the potential exists for some storms to reach severe levels at the valid time.

You can view the full suite of NDFD products at the NWS's Graphical Forecast page. Learn more about the NDFD.