Summer will officially begin at 7:09 p.m. EDT on Wednesday, and for much of the east, the season will kick off with near-record heat.

A ridge of high pressure was taking shape across the Great Lakes region on Tuesday, the last full day of spring. Afternoon highs in the low to middle 90s were recorded Milwaukee, Chicago and Detroit to Indianapolis, Cincinnati and Louisville.

The heat will be nothing new in this part of the country. All of the aforementioned cities have recorded at least two 90-degree readings so far in 2012, while Detroit has reached the mark five times.

According to Expert Senior Meteorologist Alex Sosnowski, "Chicago has hit the 90-degree mark a dozen times with St. Louis reaching the mark 17 times so far in 2012."

Interestingly, Atlanta, Ga. has had only 4 days of 90-degree temperatures thus far.

As the ridge shifts eastward on Wednesday, heat will arrive in places much less accustomed to these high thermometer readings.

Cities as far north as Boston and Syracuse are forecast to break the 90-degree mark on Wednesday. Pittsburgh, New York City, Philadelphia and Baltimore among others along the I-95 corridor are also expected to receive a harsh welcome to summer.

Wednesday will feature the first 90-degree reading of the year for many cities, a noticeable change from the cool, overcast days that have dominated the last quarter of spring for much of the East.

On Thursday, 90-degree readings will persist in the same region for the first full day of summer.

Unfortunately, the high temperatures in the mid-Atlantic and Northeast will also be accompanied by high humidity (dew point temperatures in the upper 60s and lower 70s). This cocktail, combined with sunshine, wind speed and other factors will result in AccuWeather.com RealFeel® temperatures at or above 100 degrees during the afternoon.

Some relief will be found in the form of pop-up afternoon and evening thunderstorms, as well as local waterway breezes. However, any storms will be spotty and isolated. Any sea, bay or lake breeze will wane in the evening hours.

From AccuWeather.com (find the original story here); reprinted with permission.

11 Comments

1. 1. jimmy boy 07:32 PM 6/19/12

   Now let the warming false hoods start.

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2. 2. jonathanseer 10:54 PM 6/19/12

   The Deep South is home to more climate change deniers than any place in the USA thanks in part to the stronger than much stronger influence various fundamentalists religions have in that region.
   
   Because their faith is strong, and has shown them the "truth", they will no doubt celebrate this record heat as even more proof that the Scientistians and their "facts" are just plain wrong.
   
   It's more proof, because "the scientists" predicted such warmth was due sometime next decade, NOT now nor the last few years past.
   
   If "they" know so much how could they get their dates wrong by at least a decade!!!
   

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3. 3. geojellyroll 12:59 AM 6/20/12

   jonathanseer...the irony of you posting is dripping. You write like a cultist.

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4. 4. Trafalgar 01:13 AM 6/20/12

   Weather != Climate.
   
   http://www.nasa.gov/mission_pages/noaa-n/climate/climate_weather.html

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5. 5. jctyler 02:56 AM 6/20/12

   I know this is Sci AMERICAN but why can't we also have a regular, let's say weekly, summary of the current main worldweather excentricities?

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6. 6. Carlyle 03:00 AM 6/20/12

   Sooner or later the prophets of doom will get a prediction right. Only days or weeks in advance by the way. Not years or decades. Still, probably enough to feed the chooks & fleece the flock.

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7. 7. geojellyroll 09:20 AM 6/20/12

   Scientific American now equals American regional weather reports?
   
   Why?

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8. 8. ocschwar 10:38 AM 6/20/12

   The heat wave rolled to Massachusetts last night at midnight. Key words: at midnight.
   
   The lack of nighttime cooling is precisely what climate models have been warning about.

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9. 9. jctyler in reply to geojellyroll 11:31 AM 6/20/12

   SciAm "weather report", eh?
   
   you and carlylelee will never understand; you haven't even understood the article but you already start barking.

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10. 10. jonathanseer in reply to Carlyle 03:06 PM 6/20/12

    Oh are you referring to those who believe our national debt is about to destroy the nation?

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11. 11. Crasher 07:41 PM 6/20/12

    Save this comment.....lets see how the rest of the year pans out in regard to 'global' temperature increases. Then add in the past 50 years of steady increases and then tell the scientists their wrong. Get back to me in 20 years....

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