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forecastingmintemps - ForecastingTmin ATMS 100 1...

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ATMS 100 1 Forecasting T min
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2 Nighttime Cooling 1. Long night 2. Calm or light winds 3. Dry air 4. Clear sky 5. Surface characteristics & topography Results in a radiation inversion
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2. Calm or light winds • Wind favors mixing air
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3. Dry Air 1. Air with little water vapor will cool faster than air with high water vapor content Example: Las Vegas vs. Miami 2. Overnight low rarely drops below dew point temperature T min ≥ T d
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T min & Moisture Facts Dew Point Temperature (T d ) Temperature to which air must be cooled for saturation (condensation) to occur Units ° F Measure of actual water vapor content of air High T d more water vapor Low T d little water vapor Good indicator of overnight low temperature
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“The Disappearing Puddle”
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“The Disappearing Puddle” Liquid water + energy from air water vapor EVAPORATION Temperature average kinetic energy – If air has less energy, then T Evaporationisacoolingprocess
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Formation of Dew/Clouds When T = T d ,
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