Forecast total
Snow total
For
All the snow forecast from now to each frame, in inches: a storm’s whole snowfall, and the week’s.
.136 in
Forecast map / Forecast amount
Forecast snow, each 6 hours
Over Fairplay, Maryland, where the map opens. The whole country
How much snow will fall in each 6 hours, in inches on the ground: where a storm turns to snow, and how heavy. 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, 6 hours map shows
How much snow will fall in each 6 hours, in inches of snow on the ground. Played, it shows where a storm turns to snow and how the snow moves through the mountains and the plains.
How to read it
- Under 1 in
- A coating; roads can still turn slick.
- 1 to 3 in
- Snow to clear.
- 3 to 6 in
- Heavy snow; travel slows.
- Over 6 in
- Very heavy snow, 1 in an hour or more; travel stops.
What it is for
- Time the heaviest snow of a storm.
- See where rain turns to snow along the storm’s track.
- Plan travel around the worst hours.
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 for 7 days, played as a loop of 1 to 7 days. As data: /radar/now.json?show=fsn, the times of its frames.
In the Field Book
- BlizzardFB-EVT-081
- Snowpack strataFB-WAT-031
Over a state
AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDelawareDistrict of ColumbiaFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyoming
With it
Severe AlertsWeather by stateForecast accuracyInstrument atlas
Beside it
Forecast amount
Rain, 6 hours
For
How much rain will fall in each 6 hours, in inches, snow as its water: the bands of rain crossing storm by storm.
.0112 in
Forecast, hour by hour
Temperature
For
The temperature ahead across the lower 48, Alaska, Hawaii and Puerto Rico, hour by hour, for seven days: warm and cold air on the move.
-20110 F