National Weather Service United States Department of Commerce

Fire Weather Concerns Persist Across the West; Below Normal Temperatures for the Midwest and East

As a cold front moves through the western states, gusty conditions will bring fire weather concerns through the weekend from the interior Northwest into the Great Basin and Rockies. Elsewhere, temperatures will run ten or more degrees below normal from the Upper Midwest into much of the eastern U.S. Tropical development may bring heavy rainfall to parts of the western Gulf Coast this weekend. Read More >

Meteorological Calculator
(Thanks to Ron Murphy, NWS Binghampton, NY and Bryan Ruby, NWS Sioux Falls, SD for writing some of these scripts.)

Temperature Conversion
Enter a number then click on the appropriate number to see the result.
(o F)
(o C)

Windchill Calculation
Enter in the air temperature (Tair) in degrees Fahrenheit and wind speed in mph, then click on the Calculate WC to compute the windchill (WC). (Note: Wind Chill Temperature is only defined for temperatures at or below 50 degrees F and wind speeds above 3 mph.)
Tair Wind
Index Index
More information about the windchill equation.

Relative Humidity Calculation
Enter in the air temperature (Tair) and dew point temperature (Tdp) in degrees Fahrenheit (oF) then click on the Calculate RH to compute the relative humidity (RH).
Tair Tdp

Heat Index Calculation
Enter in the air temperature (Tair) in degrees Fahrenheit and relative humidity (RH) in percent (without the % sign), then click on the Calculate HI to compute the heat index (HI).
Tair RH Tdp=
Tair Tdp RH=
More information about the heat index equation.

Wind Speed Conversion
Enter a wind speed in the box below...then select "convert".
mph mph
knots knots
m/s m/s
ft/s ft/s
km/h km/h

Station Pressure Calculation
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What is the station elevation? (feet)
The Station Pressure in inches is:
The Station Pressure in millibars is:
The Pressure Altitude is (feet):