Significant Weather Observer Program

 WEEKLY WEATHER DISCUSSION

written: 7/30/14 

Here is the latest U.S. Hazards Outlook issued by the Climate Prediction Center (CPC): http://www.cpc.ncep.noaa.gov/products/predictions/threats/hazards_d3_7_contours.png

Below normal temperatures will continue across central Illinois for the next week, thanks to a persistent upper-level trough centered over eastern Canada into the Great Lakes.  Weak impulses rotating around this feature will trigger widely scattered showers and thunderstorms during the afternoon and early evening hours of Thursday, July 31st through Saturday, August 2nd.  High temperatures through the period will remain a few degrees below normal in the lower 80s, while overnight lows drop into the upper 50s and lower 60s.  The Great Lakes trough will temporarily weaken early next week, allowing upper heights to rise and a warmer and more humid airmass to gradually return to the region.  The end result will be a period of more summer-like conditions with highs in the middle to upper 80s beginning on Monday, August 4th.  After that, medium range computer models are suggesting the Great Lakes trough will re-establish itself by the end of next week.  This will allow a cold front to trigger a better chance for showers and thunderstorms across central Illinois next Thursday and Friday, followed by cooler temperatures.    

NOTE: This weather discussion will be updated weekly (usually on Wednesday or Thursday) 

 


USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.