Forecast, each 12 hours
Chance of rain
For
The chance of rain or snow in each 12 hours, day and night, for seven days: when to expect it, and how surely.
0100%
Forecast map / Forecast, each 12 hours
Thunderstorm chance forecast map
Over 883.12 Poamoho Rain Gage No 1, nr Wahiawa, Oahu, Hawaii, where the map opens. The whole country
The chance of a thunderstorm in each 12 hours for seven days: where storms are likely, before any radar sees them. How to read it.
What the thunder map shows
The chance of a thunderstorm in each 12 hours for seven days, in percent: where storms are likely to form, before any radar can see them.
How to read it
- Under 15%
- Storms unlikely.
- 15 to 30%
- An isolated storm or two.
- 30 to 55%
- Scattered storms.
- Over 55%
- Storms likely; numerous where the chance runs highest.
What it is for
- Plan around lightning: outdoors, on the water, in the mountains.
- See the days a severe outbreak may come.
- Read with the radar once the storms form.
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 12 hours for 7 days, played as a loop of 3 or 7 days. As data: /radar/now.json?show=fts, the times of its frames.
In the Field Book
- ThunderstormFB-EVT-001
- SupercellFB-EVT-007
Over a state
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With it
Alerts in forceWeather by stateForecast accuracyInstrument atlas
Beside it
Reflectivity
Radar
Latest
Rain, snow and hail across the country now, from every radar in the national network, a new picture every five minutes.
1070 dBZ
Echo tops
Storm tops
Latest
How tall each storm stands, in feet: the higher the top, the stronger the storm and the more likely hail and wind.
560,000 ft