Monday, May 29, 2017
Heavy Rainfall Returns by the End of the Week
We'll see the threat for widely scattered showers develop again Tuesday afternoon and evening. Coverage may be a little more than what occurred Monday afternoon.
Climate Central, for every 1°F of temperature increase, the atmosphere can effectively hold 4 percent more water vapor. Meaning as the atmosphere continues to warm, it's capacity to hold more water vapor and produce heavy rainfall is increasing. Climate Central also notes that Missouri is one of the states with strongest trends in heavy precipitation events.
Locally, let's take the rain from this past weekend as an example. A line of non-severe thunderstorms rolled through early Sunday morning with the heaviest rainfall concentrated from central and northern Ogle County up to the state line. Rain reports of at least one inch, or more, were recorded.
Looking back to the month of April, Illinois recorded its second wettest April on record - according to State Climatologist Jim Angel. Not only that, but three of the top five wettest Aprils since the late 1800's have occurred since 2011. Jim Angel also notes that the period January - April was the warmest on record for the state with an average temperature of 44.5 degrees, 5.4 degrees above normal. As we continue to experience a warming climate, the threat for heavy rain events will also continue.