Humidity dives, resurgent cool next week and shooting stars

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The passage of a cold front early Friday brought relief from the oppressive humidity and removed the threat of rain for most of central Indiana.  Skies continued to brighten as dew points dropped Friday afternoon.  The cold front will stall over southern Indiana this evening.  Afternoon temperatures are running warm and close to where they were yesterday but the reason if feels so much more comfortable is the drop in the dew point.  It’s down as much as 11° in some locations.


The front has settled into southern Indiana and stalls.  Along this front a weak area of low pressure will ride east increasing clouds and possibly bringing a batch of showers through the southern third of the state through midnight.  Showers are not likely here in the city but could reach as far north as a Bloomington to Greensburg line before diminishing after 12 AM.

Hrrr Friday 8-9-2013

Hi Res model forecast radar Friday evening.


Reinforcing cool air will arrive behind a second cold front Saturday afternoon.  This front brings even milder and less humid air south Saturday evening.  There is a small chance that a few scattered showers and even a thunderstorm develops along the front but areal coverage is not likely more than 20%


A brief burst of warm and more humid  air will arrive to start the work week.  Showers and thunderstorms chances will increase to nearly 60% of the area Monday before another cold front sweeps the state.  This front will deliver very mild and pleasant weather for most of next week.  Temperatures are likely to fail to  reach 80° starting Tuesday and lasting into Friday.  Overnight low temperatures are forecast to dip again into the 50’s Wednesday, Thursday and Friday mornings.

The cool pattern rolls along with 14 of the past 17 days below normal and resurgent cool air is coming.  Blocking over far North America in the upper level wind flow has brought unusual warmth north of the arctic circle.  This buckle in the jet stream dislodged cool air and pushes it south into the eastern U.S.

Jet Stream

Upper Air pattern
a cool one continues

This pattern is not showing signs of easing with 2.5 week temperature forecast to run below normal.  Here is a break out of afternoon high temperatures from normal through August 25th.

DAYS 1-5: -4.8°

DAYS 6-10: -12.6°

DAYS 11-16: -8.8°

8-14 Day FRI 8-9-2013

8-14 Day Temp


The annual August meteor showers will peak this coming weekend Sunday and again Monday morning.  The best views are likely Saturday night after 11 PM through Sunday morning. (given the forecast sky conditions).  The Perseids are the largest “shooting star” producing meteor shows of the year in comparison.  This year experts say 50 to 100 meteors are possible per hour.


Perseid Meteor Showers