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‘Pneumonia Front’ Better Late Than Ever: Cold Front Arrival Too Late to Wreck Record High for March 15

Thu March 15 2012 7:46 pm
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The ‘Pneumonia Front’ snuck into Arlington Heights about 6:51 p.m. Thursday, but much too late to prevent another record high for March 15 — and technically not really a ‘Pneumonia Front’ — initially.

An Arlington Heights temperature reading at the Arlington Heights Historical District was 81.5°F at 5:52 p.m. CDT. The temperature dropped to 76.5°F at 6:52 p.m. CDT. That’s a drop of only 5°F in one hour. A ‘Pneumonia Front’ is defined by a 16°F drop in one hour. The Arlington Heights Historical District thermometer recorded a high of 85.1°F from 4:46 p.m. to 4:51 p.m. At 7:22 p.m. the temperature was reported at 59.2°F. That’s a 25.9°F drop in two hours and 31 minutes.

But the key temperature drop meeting the definition of a ‘Pneumonia Front’ occurred from after 6:12 p.m. with an accelerated drop immediately after.

6:12 to 7:12 … 79.3°F – 63.0°F … 16.3°F temperature drop
6:17 to 7:17 … 79.3°F – 61.2°F … 18.1°F temperature drop
6:22 to 7:22 … 78.8°F – 59.2°F … 19.6°F temperature drop
6:27 to 7:27 … 78.3°F – 58.3°F … 20.0°F temperature drop
6:32 to 7:32 … 77.9°F – 57.6°F … 20.3°F temperature drop
6:37 to 7:38 … 77.7°F – 56.5°F … 21.2°F temperature drop
6:42 to 7:43 … 77.2°F – 55.9°F … 21.3°F temperature drop
6:47 to 7:48 … 76.8°F – 55.2°F … 21.6°F temperature drop
6:52 to 7:53 … 76.5°F – 54.5°F … 22.0°F temperature drop
6:57 to 7:58 … 76.1°F – 54.1°F … 22.0°F temperature drop
7:02 to 8:03 … 69.1°F – 53.6°F … 15.5°F temperature drop
7:07 to 8:08 … 65.5°F – 53.2°F … 12.3°F temperature drop
7:12 to 8:13 … 63.0°F – 53.1°F … 9.9°F temperature drop
7:17 to 8:18 … 61.2°F – 52.5°F … 8.7°F temperature drop
7:22 to 8:23 … 59.2°F – 52.0°F … 7.2°F temperature drop

The official high at Chicago’s O’Hare International Airport was recorded at 80°F on March 15, 2012.

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CLEAR SKIES?  Weather Data for Thursday, March 15th, 2012

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  • Current Conditions : 52.5F, Overcast - 2:17 PM CST Jan. 22
    Temperature: 52.5°F | Humidity: 93% | Pressure: 29.45in ( Falling) | Conditions: Overcast | Wind Direction: West | Wind Speed: 4.0mph
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