The featured graphic is of forecasted temperature, dew point, and precipitation for Thursday afternoon. The red arrow is the wind direction. This plot nicely illustrates a process called "evaporative cooling". The wind is bringing drier air from the east underneath precipitation, which is associated with close to saturated air. As the water drops fall thru this drier layer near the surface, it evaporates, which cools the air. The effect of this process can be seen with the coolest temperatures found in Western Iowa while warmer air surrounds. The big question is if this process can cool the air enough to produce snow! The heavier rain showers will have the best chance of producing snow, since evaporative cooling will be strongest with those storms.

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