Forecast map / Forecast total

Forecast snow total map

Over 886.4 Kahana Rain Gage at alt. 95 ft., Oahu, Hawaii, 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.

Snow total on the map

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.

Beside it

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.

36 in

Open the map

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.

-20

110 F