National Weather Service United States Department of Commerce

Heavy Rain From the Plains to the Northeast; Heat Wave Begins

Severe thunderstorms and heavy rainfall are likely across parts of the Northeast, portions of the northern and central Plains, and the Ohio Valley. Portions of northeast Missouri and central Illinois could experience locally significant flash flooding. Dangerously hot conditions are expected in the Central Plains, Lower and Middle Mississippi Valley, and Southeast. 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.
Fahrenheit
(o F)
Celsius
(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
(mph)
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=
OR
Tair Tdp RH=
More information about the heat index equation.

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

Station Pressure Calculation
What is the current altimeter (inches)?
What is the station elevation? (feet)
Tulsa=680
The Station Pressure in inches is:
The Station Pressure in millibars is:
The Pressure Altitude is (feet):