Warmth rebounds with increased humidity to follow as Midwest taps heat which sent 28 states into the 90s Thursday



The warmth stages a comeback in Chicago Friday. Afternoon temperatures are to surge nearly 10-degrees higher than Thursday’s 74-degree highs at each of the city’s three observation sites—O’Hare, Midway and the Northerly Island—were the city’s coolest readings in 22 days were recorded.


That warmth is rebounding in Chicago after Thursday’s brief thermal downturn shouldn’t be surprising. Weather records here indicate the average last date for a 70-degree daytime high doesn’t occur for another 2 months until November 3. The average last date for an 80 in the city at Midway Airport is on or about October 8.



Warmth dominated much of the country Thursday. 28 states to Chicago’s west and south reported highs in the 90s.



Possibly active “northwest flow” thunderstorms could impact some Chicago area residents’ late Saturday plans



Chicago’s in the midst of its 7th driest July 1 through September 6 period since official records began here in 1871. The period has produced only 4.05” of rain officially at O’Hare, making it the driest which has occurred here in 37 years.



Friday’s predicted 83-degree high surges to 87 Saturday—the month’s warmest September temperature to date.


But the warmth combined with an influx of Gulf moisture and northwesterly jet stream winds aloft set the stage for some potentially active thunderstorms later in the day and Saturday night.



Current indications are that as much as 50% of the metro area may get in on thunderstorms later Saturday with as much as 60 to 70% of the area prone to storms a portion of Saturday night.



Records set as 90s surge into Montana Thursday; Phoenix, Arizona registers its 104th triple-digit daytime high of 2013



In stark contrast to Chicago’s cool northeast winds Thursday, the West and Southwest sizzled.


Billings, MT set a new record of 95-degrees while Denver and Salt Lake City both logged record highs of 97-degrees.



The heat in Phoenix produced a near record 111-degree high—just two degrees off the record. The reading marked that city’s 104th triple digit high of 2013.



Illinois registers 3rd-driest August on record; month’s tally even lower than during last summer’s drought!


With area farmers looking at reduced, dry-weather impacted yields in the 2013 harvest which begins in just weeks, Illinois state climatologist Dr. Jim Angel reported Thursday that August’s statewide average rainfall of 1.38” was just a third normal. It was the third-lowest August statewide precip tally on record since official observations began in 1895. That tally is a tad over a third of the average August 1981 to 2010 rainfall of 3.60”.



Sprawling Canadian high pressure’s gusty northeast winds to challenge marathoners Sunday morning while providing a cool, windy Bears home opener



A new round of brisk, comparatively cool northeast winds sweeps into the area with Canadian high pressure Sunday. The 15 to 20 mph sustained winds may prove a challenge for runners in the city’s 17th annual Half Marathon.



At the same time, the Bears home opener at Soldier Field Sunday is to feature a low 70-degree kick-off time temperature and northeast winds of 15 to 20 mph.