By: Stephen McCoy Not much change to the rest of the week's conditions from the previous forecasts, though the cold front originally slated to move through on Saturday now looks like it will move through the region Sunday morning, hence the slightly cooler maximum temperature. The front, moving eastward through central Indiana, will bring a chance for showers and thunderstorms until around mid-day or early afternoon at the latest. Expect increased winds from the northwest after the front has passed over with gusts exceeding at least 20 mph.
By: Stephen McCoy Precipitation chances have diminished somewhat for the remaining practice days for the Indianapolis 500. Otherwise, conditions are staying mostly as-expected from Monday's initial forecast.
For Thursday and Friday, a surface high pressure system currently located over the Great Lakes region is expected to move towards the northeast into eastern Canada by Friday evening. The anticyclonic rotation around the high will cause surface winds mainly from the northeast each day, with a slight change to the east during the second half of Friday. A temperature inversion in the low levels of the atmosphere will inhibit convective development on Thursday and resulting in partly cloudy conditions for much of the day. Low level winds from the east/northeast on Friday will erode the inversion and allow for a slight chance for afternoon showers and/or thunderstorms around the region. For Saturday and Sunday, an upper level low pressure trough will develop over the Missouri River Valley during Friday afternoon and into the overnight. The trough will cause a surface low pressure system to form over Tennessee/Kentucky and push northeastward through the weekend. Moisture in the lower levels will bring a chance for showers during Saturday as the low passes to the east of central Indiana. As the system continues its movement towards New England, winds in the region will shift to the north to northwest, possibly resulting in some slightly cooler temperatures, though model guidance shows uncertainty in the maximum on Sunday. By: Stephen McCoy There are no major surprises in the forecast for this week's practice and qualifying sessions for the Indianapolis 500: maximum temperatures are expected the mid 80's with chances for afternoon showers and/or thunderstorms.
For Wednesday through Friday, an upper level ridge over the southwestern US will influence a high pressure system at the surface, moving it northeastward through the Great Lakes region. For much of the time period, surface winds will be relatively light from the east to northeast, accompanied by partly cloudy skies. Dew point temperatures in the mid 60's could give enough convective inhibition to result in isolated to scattered showers and thunderstorms in the afternoon around the area. For Saturday and Sunday, conditions are anticipated to be similar to those earlier in the week, however towards early Saturday afternoon, a cold front will move eastward through central Indiana, bringing with it an increased chance for precipitation, with the greatest chance occurring in the overnight hours. Winds during the day will be from the south to southwest with partly to mostly cloudy skies. After the front passes through, winds will shift towards the north to northwest for Sunday, accompanied by clearer conditions. Much like earlier in the week, a slight chance for showers and thunderstorms is present during the afternoon. |
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