The Storm Prediction Center has placed southwestern Indiana under a Slight risk of severe weather, with extreme southern Indiana now included in an Enhanced risk.
Upper level energy will push east this afternoon and combine with an unstable air mass, along with unseasonably hot and humid air (highs today will reach the lower 90s across the southern half of the state with dew points around 70°), resulting in explosive thunderstorm development this evening. Storms will rumble east during the nighttime hours before exiting off to the east and diminishing during the early morning hours.
We target the time frame of 6p to midnight for greatest storm coverage and the possibility of severe weather. While the greatest threat of severe is just south of the city, itself, I think all of central IN is in play for the possibility of strong to severe thunderstorms tonight. In addition to locally heavy rain, stronger storms could pose a damaging straight line wind threat along with large hail.
A couple of storms may still fire Friday afternoon in the warm and humid air mass, but a boundary will pass Friday evening, allowing less humid air to arrive Saturday. On that note, even cooler and less humid air awaits early next week.
III. Our next focus is on the prospects of late week/ weekend snow. Models will continue to struggle with the finite details over the next few days. I’m not so sure the suppressed look displayed currently is the correct one. Let’s remember, this time last week models were taking our Easter storm well to our south. We’ll keep a close eye on things over the next few days.
IV. Regardless of whether we get additional snow down or not, a first-class late season arctic blast will drill south this weekend. This will be cold enough to keep temperatures in the 30s for highs Friday and Saturday. Brutal stuff for early-April when average highs are around 60…
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Despite having to dodge a couple rounds of gusty storms this weekend, we want to stress that the majority of the holiday weekend should feature rain-free hours, and certainly isn’t worth cancelling any outdoor plans. In fact, after a beautiful Carb Day, most of the daytime hours both Saturday and Sunday should be rain and storm free. Have a means of getting the latest weather information, but plan to enjoy long stretches of rain-free hours this weekend.
2.) We bracket the hours of 2p-8p (couple hours earlier from yesterday’s thinking) as the period of potential most widespread strong to severe thunderstorms across central Indiana, and the HRRR forecast radar shows what the radar may look like this evening. Have a means of getting the latest warnings.
3.) Scattered showers will continue into Friday morning before drier air arrives during the evening hours.
4.) This drier trend Friday PM is one that will continue into the weekend. High pressure will supply mostly dry weather through the entire weekend (small shower chances return Sunday evening), including sunshine.
5.) Another active period of weather awaits next week, including multiple rain chances early and late week. The latter storm looks to be the bigger event with heavy rain and thunderstorm potential Wednesday into Thursday. 7-day rain numbers check in between 1.5″-2″ with locally heavier amounts.
6.) The story becomes a chilly one next weekend, and models suggest central Indiana may be dealing with frost and freeze conditions by next Saturday or Sunday morning.
Multiple rounds of showers and thunderstorms will likely impact central Indiana through the mid and late morning hours Thursday.
As we press into the early afternoon hours, model data suggests we see a “lull” in the stormy weather and potentially even a few breaks in the cloud cover. This would serve to “up the ante” in regards to the prospects of severe weather potential Thursday afternoon, particularly mid and late afternoon through the evening hours. Accordingly, the Storm Prediction Center continues to highlight central Indiana for the risk of severe weather Thursday.
In fact, given a look at the most recent data, I wouldn’t be surprised to see the “enhanced” risk area expand further north in future updates. This would also include all modes of severe weather (large hail, damaging straight line winds, and potentially a tornado). As things stand this evening, we bracket the hours of 4p and 10p Thursday for the greatest potential of severe weather.
As we push into the overnight hours Thursday into Friday, unsettled weather will continue, but we’ll get rid of the severe potential. “Nuisance” type showers will continue into the first half of Friday before drier air arrives Friday afternoon and evening. This drier theme will settle in for the weekend and provide a very pleasant open to April.
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