National Weather Service United States Department of Commerce

Unsettled Weather in the West; Wintry Mix and Ice Accumulation Possible in Iowa and Vicinity

Significant low elevation rain and higher elevation snow is expected across central California and the Pacific Northwest into the Rockies through the weekend. A wintry mix and some ice accumulation will impact portions of the Central Plains through the Upper Midwest through Saturday. Widespread rain is forecast across the Southern Plains into the Mid-Mississippi and Ohio valleys this weekend. Read More >


 
 

Temperature Conversion

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Fahrenheit
(o F)

Celsius
(o C)

 
 

Wind Speed Calculations

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 mph   knots     m/sec     km/hr

Wind Chill Calculation

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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

Station Pressure Calculation

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What is the station elevation? (feet)
i.e. St. Louis - Lambert= 710
The Station Pressure in inches is:
The Station Pressure in millibars is:
The Pressure Altitude in feet is: