Jim Parsons sends us these interesting shots taken this past Monday morning (10/5/2009) looking west around 7 a.m. in Gurnee. Jim asks, “Is it a dry line?” It is indeed.
Photos courtesy of Jim Parsons, Gurnee, Illinois
Often the term “dry line” refers to the sharp change in moisture levels which sets up in the Plains between humid Gulf air to the east and dry air descending from the Rockies to the west. Dew points on either side of THAT dry line can vary from Gulf Coast-like 70s to the east to desert-level single digits to the west. It’s the zone along which so many severe thunderstorms erupt. But what Jim has photographed here is a “dry line” in its own sense — since it clearly features a saturated layer of air (where the clouds are occurring) next to dry air (where it’s clear). Great shot, Jim! THANKS for sharing it with us!
– Tom Skilling, WGN-TV Chief Meteorologist
Periods of rain extend into a second day across the Chicago area Friday and are likely to more than double O’Hare and Midway’s modest 0.11-inch and 0.13-inch Thursday tallies. But it was the southern Midwest that was hardest hit by downpours spawned by the week’s second storm. More than half a foot of rain (6.07 inches) had drenched Joplin in southwest Missouri by nightfall with 6.25 inches reported 110 miles to the northeast at Urbana, Mo. Downstate Mt. Olive, Illinois where a series of deluges continued much of the day, had measured 4.80 inches by day’s end. The driving rains extended east across downstate Champaign and Decatur and to Bloomington and Indianapolis—areas in Indiana where 2-3 inches fell.
Abnormally cold air was on the move from the Plains into the Rockies threatening single digit low temperatures across Montana in coming nights—temperatures likely to challenge temperature records and produce an unseasonably chilly weekend in Chicago. The coldest air surges into the area Saturday night, possibly producing a brief shower or some flurries before temperatures tumble to the mid and upper 20s at the coldest inland locations west of the city and to within striking distance of the freezing mark at the city’s official O’Hare thermometer. A 32-degree temperature hasn’t occurred in the six months since April 17 and would bring an end to the 2009 growing season—defined as the span of time between the first and last frosts of the year. Despite an incredibly rainy cool spring and cooler than normal summer weather, Friday marks the 176th day of this year’s growing season–longer than the 172 days considered normal.
Saturday cool–but Sunday and Monday chill November-like
While Saturday’s low and mid 50s are nearly 10-degrees below normal, temperatures Sunday and Monday (Columbus Day) are likely to struggle to make the mid to upper 40s. A disturbance predicted to traverse the region late Sunday night and Monday morning could produce several showers of cold rain or perhaps mixed ice pellets. Any weekend flurries would be unusual. Only 10 percent of the 125 years for which snow records exist here have recorded a trace of snow this early in the season.
What should the weather be like in Rio de Janeiro for the 2016 Olympics?
R. J. McGee Chicago
August is a very pleasant late winter month in Rio de Janeiro, which lies at the south end of the tropics just north of the Tropic of Capricorn. The 2016 Olympics will be held from Aug. 5 to 21, a time of year when daytime highs typically run in the middle 70s with morning lows in the middle 60s.
Temperature extremes for the month range from a high of 93 to a low of 54.
August is usually a dry time of the year in Rio with measurable rain falling on an average of just seven days during the month which typically receives 1.7 inches of rain. Humidity levels which can be oppressive during the Brazilian summer are moderate in August, and being a coastal city, Rio experiences frequent cooling breezes off the Atlantic.
Gina Tedesco from The Morton Arboretum sent us these beautiful shots of the bright fall color there.
Thanks for the pictures Gina!
Mary Kappel sends us this remarkable shot of a downpour rolling into Spring, Texas–north of Houston—around 2:40 p.m. Wednesday, Oct. 10. Mary says the storm wasn’t severe—but looked awfully impressive and DID produce a downpour! A terrific shot, Mary! THANKS so much for sharing it with us!
Photo courtesy of Mary Kappel, Spring, Texas
Fall colors continue to emerge with some parts of the midwest at their peak already. The best viewing weather in Illinois will be on Saturday. We will get a taste of winter on Sunday and Monday as the coldest air of the season arrives.
For updates on fall colors, click on the name of the state you are interested in: