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Tuesday update for Indy 500 Practice

5/15/2018

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By: Stephen McCoy
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With a change in the trend of more recent model runs, it appears that Wednesday will bring a slight chance of rain that may interrupt the afternoon practice session, much like today. A weak low pressure system centered over the southeast will bring winds out of the east towards central Indiana. These winds are expected to bring moisture into the area from the southeast and mid-Atlantic, resulting in the slight chance of thunderstorms for Wednesday afternoon.

Thursday’s surface weather pattern looks very similar to Wednesday’s, where moisture from the Gulf of Mexico and Atlantic Ocean wrap around a surface low pressure system over the southeast. However, where Thursday differs is the fact there is little to no motion in the upper atmosphere, resulting in an unlikely chance for storm convection. With the moisture in the lower levels of the atmosphere, expect partly cloudy conditions in the morning with increasing cloud cover as the day progresses.

Winds in the upper levels of the atmosphere are expected to shift southward, bringing more moisture into the area, and increasing chances of precipitation Thursday night into Friday morning. With a similar surface pattern as the past few days and the upper level moisture, there is a slight chance of thunderstorms in the morning, and with it a possibility that the start of Fast Friday could be delayed or disrupted; chances for rain decrease as the day progresses. Expect some windier conditions than the rest of the week as a moderate surface pressure gradient sets up over the Midwest.
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