National Weather Service United States Department of Commerce

Snow Expected from the Ohio Valley into the Mid-Atlantic; Rain and Thunderstorms in the Southeast

A frontal system is expected to bring wintry precipitation to the Central Appalachians and portions of the Mid-Atlantic into Wednesday, meanwhile, showers and thunderstorms are expected along the Gulf Coast and Southeast. A series of Clipper systems will bring periods of snow to the Northern Plains and Great Lakes over the next several days. Read More >

Washington CWSU

Center Weather Service Unit

Weather Calculator

Weather.gov > Washington CWSU > Weather Calculator

 

Weather Calculators

 
 

Temperature Conversion
Enter a number then click on the the conversion button.
Fahrenheit
(o F)

Celsius
(o C)

 
 

Wind Speed Calculations
Enter a speed into any blank to convert to all other wind speeds.
 mph   knots     m/sec     km/hr   

Wind Chill Calculation
Enter the temperature in degrees Fahrenheit and wind speed in mph, then click on the Calculate WC to compute the windchill index.
Temp
(o F)

Wind
(mph)

Index

 

Relative Humidity Calculation
Enter the air temperature and the dew point in degrees Fahrenheit, then click on the Calculate RH to compute the relative humidity.
Temp
(o F)

Dew
Point

 
 

Heat Index Calculations
Enter the temperature in degrees Fahrenheit and relative humidity (RH) in percent (without the % sign), or the Dew Point (Tdp).  Then click on the Calculate HI to compute the heat index (HI).
Temp
(o F)

RH

HI

Tdp

OR
Temp
(o F)

Tdp

HI RH

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