Chicago’s wet spring has grown even wetter. The season’s precipitation ranking surged two slots in just hours late Thursday with the onset of the area’s latest downpours.
Spring 2013’s ranking jumped from 10th to 8th-wettest and the season’s 11.13″ total through 11 pm Thursday evening made it Chicago’s soggiest on record since the 11.29″ fell over the same period in 2009.
It’s the area’s highest spring precipitation tally in four years
A “normal” spring typically produces just 6.92” by this date. The 2013 tally means rainfall is now 164% the seasonal norm—well over one and a half times normal!
Longest 70-degree spell here in over 8 months is over for now; chilly air’s arrival slashes Friday highs 27-degrees from Thursday’s 75—a late March level
Thursday’s 75-degree high marked the fourth consecutive day temperatures here reached or exceeded 70—the longest such streak in the more than 8 months since 35 consecutive 70s occurred between August 14 and September 17 last year.
The latest spell of warmth is over. A windshift to the northeast sent temperatures crashing overnight and Friday’s thick, sprinkly overcast promises little prospects for a rebound. In fact, lakeside temperatures may hover in the 40s through the day thanks to northeast winds—March-level readings.
Jet stream diving into Lower 48 from Canada to deliver second, reinforcing cool air outbreak this weekend
A second, reinforcing surge of cool air is to ride powerful northwesterly jet stream-level steering winds into the Lower 48 from Canada setting the stage for a cooler than normal Mothers Day weekend.
A brief surge in temperatures immediately behind the second cold front Saturday—a front which may initiate spotty morning showers—will be short-lived. Temperatures are predicted to drop slowly to the mid or upper 50s by nightfall Saturday evening.
Sunday Mother’s Day 2013 temps far from last year’s 72; day to feature an early April-level chill
The 72-degree high last Mother’s Day is to be but a distance memory this coming Sunday. That’s because brisk northwest winds are to continue transporting cool air into the area restricting highs to the 50s—early April-level temperatures.
The arrival of widespread cloudiness Sunday after mixed morning sun promises to further compromise the daytime warming which the presence of May sunshine might have produced.
A late season frost threat looms Sunday night
Lighter winds and the development of breaks in the clouds late Sunday night is to allow temperatures to settle into the 30s, flirting by Monday morning with the 1996 record of 34-degrees for the date. The chill also puts temperatures close to if not “at” frost producing levels.
Stunning temp rebound could take Chicagoans from a frosty Monday morning to a summerlike near-90-degree Tuesday temp
A dramatic temperature rebound follows next week. Southwest winds, due to put in an appearance here Monday afternoon, are to begin the warming process—-pumping readings into the low 70s after a morning of 30s and patchy frost. But that warming’s just the beginning. All indicators continue to point toward temperatures moving well into the 80s Tuesday and Wednesday—a period which will also see mid and upper 60-degree dew points arrive! Dew points provide a measure of atmospheric moisture and readings at those levels indicate perceptibly more humid air is to accompany the year’s warmest temperatures to date.
A 90-degree reading isn’t completely out of the realm of possibility on either day. And powerful thunderstorms could sweep the area late Wednesday or Wednesday night with a new cold front’s approach and passage.