Forecast amount
Snow, 6 hours
For
How much snow will fall in each 6 hours, in inches on the ground: where a storm turns to snow, and how heavy.
.136 in
Forecast map / Forecast total
Forecast snow total map
Over Stromsburg, Nebraska, where the map opens. The whole country
All the snow forecast from now to each frame, in inches: a storm’s whole snowfall, and the week’s. How to read it.
The rings are the storms the radars detect, the larger ring a severe one; each line runs to where its storm will be in an hour if it keeps its present speed and heading. Rotation and hail are what the radars detect and the analysis measures, not warnings: the official watches and warnings in force are drawn on the map in their own colours and set out in full under Alerts.
What the snow total map shows
All the snow forecast from now to each frame, in inches: a storm’s whole snowfall, and the week’s, adding up as it plays.
How to read it
- Under 1 in
- A dusting.
- 1 to 4 in
- A minor snow.
- 4 to 8 in
- A winter storm in most places.
- 8 to 12 in
- A major snowfall.
- Over 12 in
- Deep snow; in the mountains, the snowpack building.
What it is for
- See a storm’s whole snowfall before it starts.
- Plan for the mountains: fresh snow on the passes and ski areas.
- Judge the load on roofs and trees.
How it is made
The forecast maps are drawn from the national blend of the forecast models: the models joined into one forecast and corrected against what each place has measured, on a grid 1.6 miles across, the forecast the country’s forecasters start from. Each of its main runs, four a day, is read whole, laid onto the same grid of latitude and longitude as the radar at 2.8 miles a cell, and played forward from now.
A frame every 6 hours, each the total to then, played as a loop of 1 to 7 days. As data: /radar/now.json?show=fsnt, the times of its frames.
In the Field Book
- BlizzardFB-EVT-081
- Snowpack strataFB-WAT-031
Over a state
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With it
Severe AlertsWeather by stateForecast accuracyInstrument atlas
Beside it
Forecast, each night
Lows
For
The lowest temperature of each night for the next seven days: frost, freeze, and warm nights that bring no relief.
-20110 F