By Doug Schneider

Unfortunately, the weather will be wet the weekend for the INDYCAR finale at Nashville Superspeedway. Rain is going to cause some interruptions to the on-track sessions, especially on Saturday. 

The remnants of what was Hurricane Francine will be located over Arkansas on Friday, and slowly meander around Mississippi and West Tennessee through the weekend. This will place Nashville Superspeedway in a very moist pattern, with a southerly flow of moisture from the Gulf of Mexico feeding into Middle Tennessee all weekend. Rain bands on the outer extent of the low pressure system will bring periods of rain at the track on Saturday, and there will likely be significant delays or cancellations to the on track action for INDY NXT and INDYCAR practice and qualifying. Rain amounts on Saturday are expected to be between a half inch and one inch. A thunderstorm will be possible, but the chance of one is low as coverage of storms in Middle Tennessee is expected to be isolated.

On Sunday, the low pressure system will weaken and drift slightly to the west, and high pressure over New England will build southward. The outer rain bands may shift a little to the west, which may result in more dry time at the track. There is uncertainty with where these rain bands will be located on Sunday. The best case scenario is that the high pressure system is strong enough to push those bands west of the track, and the afternoon hours are mostly dry. The worst case scenario is that the high doesn't build in enough, and rain bands set up over the track again, like Saturday. Expected rain amounts on Sunday are between a quarter and a half inch, but that will depend on where those rain bands set up. 

I really wish I had better news about the weather, as I'll be attending the race. I will try to post some radar and weather updates from the track at our X account, @RacecastWx.

By Doug Schneider

Unfortunately, the weather pattern looks like there will be wet conditions at times for the INDYCAR season finale at Nashville Superspeedway. A tropical low pressure system is expected to move northward from the Texas coastline to the Mid Mississippi Valley this week, and linger over West and Middle Tennessee through the weekend. The location of this low will mean plentiful moisture will be transported north from the Gulf into Tennessee. 

With this pattern, showers are likely both Saturday and Sunday, with a low chance of a thunderstorm. Timing and rain amounts are unclear this far out, but the afternoon hours appear to have the best rain chances as surface heating creates instability for showers to develop. I expect that there will be some interruptions to several on track sessions both days. 

Check back later in the week for updates and further details on timing and rain amounts. 

By Doug Schneider

Rain is moving through the Milwaukee area this morning. Most of this rain should be out of the area between 8 and 10 am. The first on track activity is INDY NXT practice at 1:30 pm CDT, which should allow for plenty of time to dry the track. I don't expect that there will be any weather impacts today, as a cold front pushing through this afternoon will be followed by drier air and perhaps some sunshine at times. The rest of the weekend will have very nice weather. A second cold front will move through on Saturday night, which will bring cooler temperatures on Sunday, with highs in the mid 70s and a north wind at 10 to 15 mph.

By Doug Schneider

A nice weekend is in store for INDYCAR's return to the Milwaukee Mile. A cold front will push through the area on Friday, but the showers and thunderstorms with this front are likely to occur in the morning, before any on-track activity is scheduled. There may be a delay to starting practice as the track dries, or if showers arrive a little later than expected. But overall, the impact appears low. The rest of the weekend looks beautiful, with abundant sunshine and comfortable temperatures. 

By Doug Schneider

No big changes are needed from my original forecast for INDYCAR's visit to WWT Raceway for the Bommarito 500. The weather looks great both today and tomorrow, but temperatures will be on the hot side, reaching the lower 90s. The humidity will not be oppressive, with daytime dewpoints expected to be in the upper 50s to lower 60s both days. There is a small (20%) chance of showers moving through the area on Friday night, but the timing will not impact the on-track activity. 

By Doug Schneider

No weather impacts are expected for INDYCAR's visit to World Wide Technology Raceway. There is a high (70%) chance of showers and thunderstorms on Thursday as a cold front pushed across the region, but by Friday, the rain will exit and drier air will be building into the St. Louis area. Building high pressure to the west will provide a northwest wind at 10-15 mph, and while temperatures will still reach near 90 in the afternoon, the humidity levels will be noticeably lower on Friday. There is a low (20% chance) that a thunderstorm complex will be near the area on Friday night, but the overnight timing is not likely to affect the on-track activity. Saturday looks like a nice day with temperatures in the 80s and a northwest wind at 10-15 mph, with low humidity. Temperatures during the evening race will be falling through the 80s to the upper 70s by the checkered flag.

By Doug Schneider

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The weather continues to look great in Toronto for INDYCAR weekend. As I mentioned in my initial forecast post, a cold front will move through the area on Saturday night and Sunday morning. It is possible that a few showers near the front could produce light rain early Sunday morning, likely before any on track activities begin. No impacts are expected if rain does occur. 

By Doug Schneider

Click on images to enlarge

Beautiful weather is expected this weekend for the Honda Indy Toronto. 

High pressure will be over the Great Lakes region at the start of the event on Friday, and gradually drift east across southern Ontario and New York through Saturday. A cold front will approach Toronto from the north on Saturday night, but any showers near the front are expected to dissipate before the front gets to Toronto. It will cross the city on Sunday, but the only change in the weather will be a little more cloud cover, and winds that will shift to a north direction.