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Basic Concepts <br /> WEATHER <br /> Knowing existing and potential weather conditions is very <br /> important for a successful snow and ice control operation. Six <br /> pieces of information are especially valuable: <br /> 1. Start of precipitation <br /> 2. Type of precipitation <br /> 3. Total precipitation expected s <br /> o <br /> 4. Expected event length <br /> 5. Wind conditions (speed, gusts, directions) 5 <br /> 6. Temperature trend <br /> 0 <br /> Monitor the weather closely so that you are available and pre- <br /> pared to act early in storm situations. <br /> g, <br /> a <br /> Weather information sources 3 <br /> • Phone 511 to get road condition and travel information or <br /> visit the Web: www.511mn.org. �n <br /> • Talk to neighboring agencies and share information on <br /> conditions. <br /> • Subscribe to a value -added meteorological service <br /> (VAMS). These are useful for viewing weather forecasts. <br /> • Check the National Weather Service. <br /> • Check all available weather sources. _, <br /> _ . <br /> zi <br /> PAVEMENT TEMPERATURE <br /> Most weather stations measure temperature and other con- <br /> ditions 30 feet above ground, which means these conditions Pavement <br /> can differ substantially from pavement temperatures. Thus, temperatures can <br /> use the pavement temperature —not the air temperature —to be substantiall o y . <br /> determine your application rate. lower or a <br /> higher than air ° E. <br /> You'll notice changes in pavement temperature first on bridge emperatures . <br /> decks; pavement temperatures will also be lower in shady ar- . a <br /> eas. a <br /> a <br /> Measuring with sensors or RWIS <br /> There are two ways to measure pavement temperatures: O. <br /> with sensors or with the Road Weather Information System <br /> (RWIS). <br /> 1 <br /> C0 <br /> n <br /> 52 <br />