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Baton Rouge, Louisiana
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Monday evening video forecast

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The weather story of the week will be unseasonably hot temperatures, including the potential for record highs. A meaningful drop on thermometers is not expected until at least early next week.  

Next 24 Hours: Any clouds will quickly diminish overnight with low temperatures sagging back into the low 70s. Tuesday will feature ample sunshine, which help high temperatures achieve the mid 90s with no problem. The 2007 record of 98 degrees appears to be safe.

Up Next: Wednesday and Thursday will be the hottest two days of the week and the entire forecast period. Beneath a dominant ridge of high pressure, sinking air will cause abundant sunshine and warmer than average temperatures that top out between 95 and 97 degrees. Since humidity will not be at July and August levels, feels-like temperatures should be around 100 degrees. A weakening front will come into the area Friday and do little more than drop dew points by a couple of degrees. It will remain warmer than average over the weekend with highs in the low 90s. By Monday, a more substantial cold front will come into the area with some chance for making it through with drier, more seasonable temperatures following. Coincidentally, that front is also the next reasonable chance for showers and thunderstorms. CLICK HERE for your detailed 7-Day Forecast.

The Tropics: After producing catastrophic flooding across Puerto Rico, Hurricane Fiona will push northwest into the southwestern Atlantic Ocean and continue strengthening. As of 4pm Monday, maximum sustained winds were at 100 mph and Fiona is expected to become a major hurricane by Wednesday as it turns more due north at 10mph. Hurricane conditions will continue across portions of the Dominican Republic through Monday and then occur in Turks and Caicos on Tuesday.

A tropical wave located several hundred miles east of the Windward Islands is producing an area of disorganized showers and thunderstorms. There is a twenty percent chance of gradual development of this system over the next several days while the system approaches the Windward Islands toward the end of the week and moves over the eastern Caribbean Sea over the weekend.

The Explanation: With a building upper level ridge of high pressure just to our northwest, large-scale sinking air will help heat build over the next several afternoons. The proximity of the ridge will also provide a transition in the vertical wind profile from the northeast with time, dragging drier continental air into our area further aiding in the suppression of diurnally drive convection. Expect high temperatures in the mid 90s through the workweek. While some forecast models believe upper 90s are possible, they may be missing the fact that the lower sun angle and rapidly decreasing daytime hours for heating. These ideas were pointed out by our colleagues at the National Weather Service. A weak front may be swinging through on Friday with drier air and temperatures backing off a bit closer to average going into the weekend. Pop-up showers and thunderstorms may return to the area on Sunday and Monday ahead of a cold front dropping in from the north. There are some signs that this boundary could cross to get thermometers back to or below average, which would be upper 80s/upper 60s by those dates.

--Josh

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