Tuesday posts a 76-degree dew point—the muggiest reading of 2013 and the most humid Chicago air mass since last June


Humidities in Chicago, after a 5th consecutive day in the 80s Tuesday, surged to stifling levels in the late evening—-registering levels higher than those being observed on the perennially humid Gulf Coast at the same time.

Dew point are meteorologists’ preferred measure of the air’s moisture content. Tuesday’s reading in Chicago first soared to a 2013 high of 76-degrees at 8 pm—then held at that level for four consecutive hours.



It was more humid here than on the Gulf Coast



The 76-degree dew point blew past the 73-degree reading observed late Tuesday evening at Houston, Texas; the 73 at New Orleans, 71 at Tampa and 69-degree measurement at Miami.


A higher dew point hasn’t occurred here in Chicago since June 28 last year when 78-degrees was observed. The atmospheric moisture level indicated by Tuesday’s reading is more typical of the oppressively humid environment found in the muggy Amazon River Valley or in areas which sit adjacent to the Persian Gulf in the Middle East.


Week-long warm spell which started on the 4th produced 33 consecutive hours of “humid” 70+degree dew points up to 10 pm Tuesday evening


Tuesday’s muggy air mass was a week in the making and produced a string of 33 non-stop hours of oppressive 70-degree or greater dew points which began at 1 pm Monday and continued through 10 pm Tuesday and beyond!


Developing dome of hot air could bring summer’s highest temps yet next week



The arrival of Canadian high pressure and its cooler, less humid northwest winds is to bring the sultry weather of the past week to a temporary end, though thgere’s evidence the summer’s most expanded and potentially hottest air mass may be headed this way next week.



Wednesday marks the 100th anniversary of the country and world’s highest observed temp: 134-degrees at Death Valley, California


Even as cooler temperatures descend on Chicago the next few days, it’s worth noting that Wednesday marks the 100th anniversary of the country and world’s highest observed temperature— the 134 degree reading which occurred at Death Valley, California in 1913.


Tropical Storm Chantal to cross Haiti and the Dominican Republic headed for the Bahamas; the storm’s being monitored in the Southeast U.S.


Tropical Storm Chantal raced into the northern Caribbean Tuesday at such a pace, that at least one National Hurricane Center forecaster expressed surprise the system was able to maintain a “closed” circulation (i.e winds which blew all the way around the system in a counterclockwise direction).



Chantal produced reported 69 mph wind gusts while crossing the Leeward Islands Tuesday.  The storm’s winds may briefly approach hurricane status (i.e. sustained winds of 74 mph) before crossing Hispanola—-the island home of Haiti and the Domincan Republic.




Interaction with land is likely to sap some of the storm’s strength, though modest re-intensification is being predicted by the National Hurricane Center as Chantal re-emerges into the warm waters surrounding the Bahamas. The storm’s currently predicted path would move it parallel to the Florida coast line toward the weekend. But, forecast uncertainty at that distance and time dictates that residents of the Southeast should monitor future forecasts and storm updates.

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