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
Forecast map / Forecast, each night
Forecast lows map
Over Citizen station FW8402, Louisiana, where the map opens. The whole country
The lowest temperature of each night for the next seven days: frost, freeze, and warm nights that bring no relief. How to read it.
What the lows map shows
The lowest temperature of each night for the next seven days, the hours from 7 PM to 7 AM Eastern Standard Time. Where frost and freezing can reach, and where the night stays warm.
How to read it
- Below 0 F
- A bitter night.
- 0 to 32 F
- A freeze; pipes and plants at risk.
- 32 to 36 F
- Frost possible on clear, calm nights.
- 36 to 70 F
- A cool to mild night.
- Over 75 F
- A warm night that brings no relief from the heat.
What it is for
- See the first frost of autumn and the last of spring.
- Protect plants, pipes and animals before a freeze.
- Find the warm nights that make a heat wave dangerous.
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 each night for 7 days, played from tonight. As data: /radar/now.json?show=flo, the times of its frames.
In the Field Book
- Radiation budgetFB-ENG-007
Over a state
AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDelawareDistrict of ColumbiaFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyoming
With it
Alerts in forceWeather by stateForecast accuracyInstrument atlas
Beside it
Forecast, each day
Highs
For
The highest temperature of each day for the next seven days: where heat builds and where cold air holds.
-20110 F