Impressively High Dew Points Diminishing Today (Updated with video)

View this video for a more complete explanation of dewpoints and humidity!

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
608 AM CDT WED JUL 10 2013 /708 AM EDT WED JUL 10 2013/

...MUGGY WEATHER BRINGS LONG STRETCH OF 70 DEGREE DEW POINTS...

HIGH DEW POINT AIR MADE IT FEEL QUITE MUGGY DURING THE FIRST HALF
OF THIS WEEK. A COOL FRONT MOVING THROUGH THE AREA EARLY TODAY WILL
BRING REPRIEVE TO THE REGION. BELOW IS A QUICK "BY-THE-NUMBERS"
LOOK BACK AT THIS RECENT HUMID EPISODE...PARTICULARLY LOOKING AT
THE PERIOD WHERE THE DEW POINT WAS ABOVE 70 DEGREES...WHICH CAN
FEEL UNCOMFORTABLE TO MANY.

CHICAGO...

- AS OF 6 AM THIS MORNING...CHICAGO HAD EXPERIENCED 42
CONSECUTIVE HOURS OF A DEW POINT AT OR ABOVE 70 DEGREES.

- THIS IS THE LONGEST SUCH STRETCH SINCE 45 CONSECUTIVE HOURS FROM
JULY 27-29 2011...AND 47 HOURS FROM JULY 17-19 2011. NOTE THAT
THE HEAT WAVE OF LAST SUMMER DID NOT HAVE A PROLONGED STRETCH THIS
HIGH...LIKELY HELPED BY THE DRY GROUND CONDITIONS AT THAT TIME.

- THE HIGHEST HOURLY DEW POINT OBSERVED WAS 76 DEGREES. THIS WAS
THE HIGHEST SINCE 77 ON JUNE 28 2012.


ROCKFORD...

- AS OF 6 AM THIS MORNING...ROCKFORD HAD EXPERIENCED 45
CONSECUTIVE HOURS OF A DEW POINT AT OR ABOVE 70 DEGREES.

- THIS IS THE LONGEST SUCH STRETCH SINCE 75 CONSECUTIVE HOURS FROM
JULY 31-AUGUST 3 2011. NOTE THAT THE HEAT WAVE OF LAST SUMMER DID
NOT HAVE A PROLONGED STRETCH THIS HIGH...LIKELY HELPED BY THE DRY
GROUND CONDITIONS AT THAT TIME.

- THE HIGHEST HOURLY DEW POINT OBSERVED WAS 76 DEGREES. THIS WAS
THE HIGHEST SINCE 76 ON JULY 6 2012.


PROLONGED EPISODES OF 70 DEGREE DEW POINTS CERTAINLY HAPPEN
ACROSS NORTHERN ILLINOIS AND NORTHWEST INDIANA...IN FACT THE 30
YEAR AVERAGE FOR BOTH CHICAGO AND ROCKFORD IS SLIGHTLY OVER 300
HOURS A YEAR /THOUGH THERE IS A LARGE STANDARD DEVIATION/. SO THIS
RECENT EPISODE IS NOT UNPRECEDENTED BY ANY MEANS...BUT IT IS EYE-
OPENING TO SEE THAT IT HAD MORE CONSECUTIVE HOURS THAN THE HEAT
WAVE OF ONE YEAR AGO. IT ALSO SHOWS THE IMPORTANCE OF MONITORING
NOT ONLY TEMPERATURES BUT DEW POINTS TOWARD COMFORT AND HEALTH
RISKS...AS THE TEMPERATURES THROUGHOUT THIS RECENT EPISODE
REMAINED BELOW 90 DEGREES...YET FOR MANY IT LIKELY STILL WAS
UNCOMFORTABLE.

$$

MTF


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