Dew Point Records & Wednesday Storms

***Watch WISN 12 News at 5, 6, & 10 p.m. for Milwaukee’s most accurate forecast!***

Thank you for stopping by the Weather Watch 12 Blog!  I hope you have found a way to stay cool during this stretch of warm and humid days.  Some people have called this a heat wave, but my definition of a heat wave in this part of the country is 3 consecutive days with highs of 90 or more.  Heat wave or not, some relief would be nice.  That arrives later in the 7 day forecast.

Let’s continue talking about the humid weather conditions.  A good indicator of how humid it feels is to look at the dew point.  The dew point is a measure of moisture near the surface.  The higher the dew point, the stickier it feels.  So far this summer the highest dew point in Milwaukee at Mitchell Airport has been 75 degrees.  That occurred on the day we saw the massive flooding…July 22.

The 75 degree dew point does not fall into record territory.  Here are the 5 highest dew points ever in Milwaukee.

  • 82  July 30, 1999
  • 82  July 4, 1977
  • 81  August 6, 1968
  • 80  July 13, 1995
  • 80  September 7, 1985

So while we’ve been humid, nothing quite like the days listed above!

With lots of humidity hanging in the air, and a weak disturbance sliding in for Wednesday, the result should be another round of showers and thunderstorms.  As we have been discussing this for the past several days here in the blog.  Any storms that develop will have the potential to produce downpours and heavy rain.  Starting early Wednesday morning, and continuing throughout the day the threat of storms is in the forecast.  As of this writing it looks like a round of morning storms and then another late in the day/evening is possible.

With 2 possible rounds of rain on Wednesday, rain totals could approach 2″-3″ in spots.  Below is just ONE rainfall forecast, this is from the 18Z NAM.  The bright orange color near Beloit represents rain totals of 3″+.  I marked Milwaukee with a ‘*’ for a reference spot.  I want to stress that this is not set in stone, and the possible heavy rain likely will not set up like this.  Just keep in mind that pockets of heavy rain are possible on Wednesday!

If you have a rain guage at your house we would love to see your rain total.  Just post it to the comments section of the blog, or drop it off on our Facebook page at WeatherWatch 12  If you follow us on Twitter at WISN12News you can always tweet us your total!

Before we wrap up this entry I want to pass along what should be some great news.  A huge drop in humidity will arrive on Sunday behind a cold front.  The less humid weather should last through Tuesday of next week.  Below is a dew point forecast from the 12Z GFS computer model.  This is valid Sunday morning.  Notice that parts of our area are forecast to have dew points in the 50s!  Just click on the image to enlarge. 

If any of the storms produce Flash Flooding or Severe Weather make sure to watch WISN 12 for the latest updates.  If severe weather strikes day or night we are here!

Have a great day and check back to the blog and WISN 12 for updates! 

Jeremy Nelson


6 Responses

  1. Today is another one of those days when you can actually see the humidity in the air. It’s hazy. Even with a slight southeasterly breeze it is still very uncomfortable.

    I vowed not to put my AC in this year, but finally broke down. We’ve had a long stretch of high dew point days. It’s so much nicer in the house.

    I’ve been keeping an eye on the radar today. Hoping the heavy rains (if they move in) are not in my area. Looking forward to some lower dew points and cooler temps.

    • Cliff,

      I love hot weather, but when it comes to being in the house I have the A/C on all the time. When relaxing I want to be comfortable. I’ll take heat and humidity over snow and cold anyday.


  2. I suppose having lived in Kansas City has toughened you a little more to this kind of weather to have such high expectations of what you consider an actual heat wave. How about a heat index wave? A muggy wave? An A/C bill skyrocketing wave?

    • Daniel,

      Another way to look at this. Not one day this summer has Milwaukee been under a Heat Advisory. So in my opinion, just a mini heat wave this summer.


  3. A couple of weeks ago, I think Gary said the Brookside neighborhood had an 83 degree dewpoint….. ouch.

  4. While the record dewpoints have not been met in MKE, I do wonder if you took the two week stretch of the average dewpoint if it wouldn’t be in the top ten over the last fifty years.

    We have really noticed the abnormal moisture this summer to your south. Unfortunately, in our area, we have topped 80 degree dewpoints fairly frequently this summer. I do remember seeing a 93/83 nearby this year.

    Heatwaves are definitely subjective. I would think in central/west Texas, it would have to be several days over 105 degrees. I guess it is all relative.

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