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Baton Rouge, Louisiana
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Set to scale back this humidity

2 months 2 weeks 3 days ago September 19, 2016 Sep 19, 2016 Monday, September 19 2016 September 19, 2016 6:11 AM in Weather
Source: WBRZ Weather

As some slightly drier air filters into the region, rain coverage will be minimal until the weekend. Despite a little less humidity, efficiently warming drier air will keep afternoons hot. For a record 103 days, temperatures have not been in the 60s. The streak started before astronomical summer started. We could potentially see that change before fall officially begins Thursday Morning.

THE FORECAST:

Today and Tonight: Monday will be partly sunny and humid with a high temperature in the low 90s. Only an isolated afternoon shower is possible. Overnight will be mostly clear with a low in the mid 70s.

Up Next: Tuesday through Friday will bring more of the same. A weak push of drier air on Tuesday could lead to slightly cooler low temperatures by Wednesday Morning with some low 70s and perhaps upper 60s in our traditionally cooler locations north of I-12. 

The Tropics: In the tropics, Julia will finally begin to move a little north toward the Carolinas as a post-tropical system. Karl will likely become a hurricane this week, however at the moment; it looks as if it will recurve into the Atlantic. It's still a ways out though, so we're watching it.

THE SCIENCE:

Forecast Discussion: A weak backdoor cold front will slide into the area today as an upper trough tracks across the Southeastern U.S. and an upper ridge will begin shifting eastward. Surface high pressure building in from the north and northeast will bring much drier air to the region. Rain chances will be minimal and dewpoints will fall into the 60s which will also guide low temperatures back into the upper 60s in portions of the forecast area north and east of Baton Rouge. However, high temperatures will not change much as drier air will allow for ample warming. On the positive side, with the lower dewpoints, it will not fell nearly as hot and humid and heat index values will only be a few degrees above the air temperature. The upper level ridge over the area will begin to weaken towards the end of the week and next weekend as a deep trough starts to progress east across the Rocky Mountains. The chance for rain will return as moisture levels increase. Right now we'll advertise rain coverage of 20-30 percent but that could increase by Sunday as a more significant system approaches the area. Forecast models suggest that trough could be will be quite significant, accompanied by a cold front and could result in our first real fall temperature swing. 

You can stay in touch with Meteorologist Josh Eachus on FACEBOOK and TWITTER.

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