A Warming TrendJuly 15th, 2014 at 8:59 pm by Bill Steffen under Bill's Blog, Weather
Click on the images to enlarge. These are the latest 6-10 day outlooks from the Climate Prediction Center. This is for July 21-25. For a change, we’re going to see warmer than average weather push into Michigan and the Great Lakes. I’m forecasting temperatures in the mid-upper 80s for the first half of next week. We have a chance that on one of those days, we could hit our first 90° day of the summer in G.R. Last year at this time, we were in the midst of six days in a row of 90-degree temperatures from the 14th thru the 19th. One of the reasons that we have not made 90° is the above average rainfall that has covered much of the eastern U.S. The sun has to spend some energy evaporating water (it’s like when you get out of the shower and you feel cold…as water evaporates off your skin, it “steals” heat from your body). When there is less water to evaporate, the sun can spend more of it’s energy heating air. The high moisture air also brings higher dewpoints, which means temperatures don’t get as cool at night relative to when we have drier air. We’re also going to increase the humidity and by the middle to end of next week, we’ll have a better chance of our next round of thunderstorms. Through today, here is the temperature departure from average for July: Grand Rapids -3.6°, Lansing -3.1°, Muskegon -4.0°, Cadillac -5.9°, Ludington -6.4°, Manistee -7.0°. The 8-14 day outlook has temperatures back to average over the Great Lakes. Our average temperature for July 1-15 is 68.9° in Grand Rapids. If we ended the month at 68.9° that would tie us for 6th coolest July ever…however, the warm air coming next week will knock us out of at least the top 15 coolest.