Late Summer Sizzler & Tropical Update

***Watch WISN 12 News this weekend for the latest weather information!***

Thank you for stopping by the Weather Watch 12 Blog!  In today’s entry the focus will be on a developing late August heat wave.  When it arrives, how high dew points will climb, and when rain will drop temperatures.  We will close the blog with a look at a hurricane which may come very close to parts of the U.S. by later in the week.

First, you may hear me use the term 100% sunshine from time to time.  The past several days have fallen into this category with not a cloud in the sky.  Below is a visible satellite image from 4 p.m. Saturday afternoon.  Notice that no clouds were present over the state of Wisconsin.  Safe to say we were enjoying 100% sunshine and a fantastic start to the weekend!

The comfortable 80s with low dew points that covered our area on Saturday, will be replaced by a more humid and much warmer airmass on Sunday, Monday, and Tuesday.  Daytime highs each day will be in the 86-90 degree range.  So don’t be surprised to see a few low 90s sprinkled across southeast Wisconsin in the coming days.

Below is a forecast temperature map for Sunday at 1 p.m.  This map is from the 12Z NAM computer model.  Notice that at 1 p.m. temperatures will already be in the 85-89 degree range for our area!  As long as a slight southeast wind does NOT develop, Milwaukee could touch 90 on Sunday!  Just click on the map to enlarge.

The record high in Milwaukee on Sunday and Monday is 96 degrees.  I don’t think we’ll get that warm, but we will be at least 10 degrees above our average high for the next several days!  And when you throw in dew points of 65-70 degrees, it will feel like the 90s across our region!  Hang in there, September begins on Wednesday!  And remember, by the end of September the average high falls to 67 in Milwaukee!

Our mini heat wave should end on Wednesday as a front will bring a chance of showers and t-storms to the area.

Finally, I want to update you on a tropical system – Earl.  Earl will likely become a hurricane on Sunday as it progresses toward the Leeward Islands.  Any interests along the East Coast of the U.S. will need to keep a close eye on Earl this week.  Just a slight shift to the west, and Earl could bring some nasty weather to the Carolinas!

Below is the forecas path from the National Hurricane Center.  Keep in mind the forecast accuracy greatly decreases past 3 days.  That is why you see a forecast ‘fan’ below.  The hurricane could track anywhere within the white outlined area.  And notice how close this gets to the Southeast Coast of the U.S.!  We will continue to keep you posted on Earl in the coming days in the blog and also on WISN 12 News.

Have a great Sunday and check back here for updates along with our Facebook page at WeatherWatch 12 and on Twitter at WISN12News  Also, stayed tuned to WISN 12 News for the latest data throughout the weekend!

Jeremy Nelson

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