By: Harris Cooley

Weather will be spotty this weekend for the Dutch GP as a Low pressure system is lined up to pass through the area beginning Friday evening. Some scattered storms are possible Friday leading up to this Low, but the highest chances are for Saturday into Sunday as bands of rain will be moving through the region. Southwesterly winds will be picking up as the Low moves inland as well with gusts up to 35 mph.

This will be a tough race to navigate if these conditions come to fruition throughout the race. Radar surveillance and wind gust preparation must be exercised for a clean drive. A metric graphic is pasted below... 

By Doug Schneider

It's going to be a hot week in the St. Louis area, but the good news is that cooler temperatures will arrive in time for the Bommarito 500 activities. High temperatures at WWTR on Thursday and Friday will be near or above 100 degrees. On Saturday morning, a front is expected to move through the area, which will shift winds to the northeast and bring a cooler and less humid air mass. With moisture being very limited, no rain is expected with the front at this time, but this will need to be monitored for changes through the week. Sunday will be a very nice day to be at the track, with highs in the lower 80s and comfortable humidity levels. There will be a northeast breeze both days, between 10 and 15 mph.

By Doug Schneider

Mixed conditions are expected at VIR for Michelin GT Challenge weekend. It will start off hot and humid, followed by a frontal passage that will bring showers and storms, then cooler and drier air will build in behind the front.

Friday's chance of showers will be mainly in the afternoon, as the atmosphere heats up and creates instability. With winds from the southwest, temperatures will climb into the mid 90s, with a heat index approaching 100. Afternoon showers are expected to develop near or along the Blue Ridge and track east into the Piedmont. Coverage is expected to be scattered, and the chance of a shower or storm at the track is about 30% at this time.

The chance of rain increases on Saturday as a cold front moves southward across Virginia. There are some disagreements among the models regarding the coverage of showers with this front, and the timing of the best chance of rain is still uncertain this far out. The expected cloud cover and frontal passage will bring temperatures down from Friday's highs, but the humidity will still be quite high. 

The passage of the front on Saturday is expected to be followed by a more pleasant air mass on Sunday, as high pressure over the northeast builds southward into Virginia and the Carolinas. Under mostly sunny skies, highs will be in the lower 80s, with more comfortable humidity levels. 

By Scott Martin

We are looking to start off the morning with mainly sunny skies and the temperature around 74F. Clouds will slowly build through the day, and we'll end up with partly sunny skies by the afternoon. It will be very warm, and with dewpoints starting off in the 70s, it will be muggy as well. The afternoon high will top out around 87F with a heat index of around 93F. Winds will be out of the north, but by the afternoon, winds will be out of the east at 5-10 mph. No rain is expected at all.

By Doug Schneider

There will be a few rounds of showers in Indianapolis over the weekend, but the timing of these showers looks favorable for little to no impacts on the racing at IMS. 

An upper level disturbance will be crossing the Illinois/Indiana area Friday night, and thunderstorms are likely to occur during the overnight hours. There is a small chance that some showers could linger around Speedway after sunrise, but they should be gone by the time of the first on-track session (Xfinity practice) at 9:35 am EDT. The rest of Saturday should be dry and mostly sunny, with temperatures reaching into the mid 80s. There could be a few showers in the area Saturday evening as a front moves into the area, after the end of the Xfinity Pennzoil 150.

Another upper level disturbance will cross the Mississippi River on Sunday, and track east through the afternoon. Showers with this system are expected to move into central Indiana late in the day or during the evening, most likely after the end of the Verizon 200. If the timing of this system shifts a little earlier, it could impact the late stages of the race, but I think the chance of that happening is low. 

By Doug Schneider

Overall, good weather is expected at IMS for the combined INDYCAR and NASCAR events for Brickyard Weekend. The main risk of rain at the track will come on Friday night as an upper level trough swings across the area. The most likely timing of this rain should not affect any on-track action, however a few showers will be possible into Saturday morning. The chance of rain should be gone by the time the INDYCAR race starts at 2 PM. Sunday's weather looks great for the NASCAR race, with mostly sunny skies. Temperatures through the weekend will peak in the mid to upper 80s. 

By Scott Martin.

By: Stephen McCoy

A cold front is expected to move through the region late Thursday evening into Friday. During the day on Thursday, ahead of the front, winds will largely be from the Southwest. These winds will bring warmer, above-average temperatures to the area, with afternoon highs approaching 90°. In addition, scattered showers are expected to develop along the front, which have a chance to enter the region in the late afternoon; a few thunderstorms may also be possible.

Once this front moves through, an area of high pressure will build in, shifting winds more towards the North. As a result, temperatures for Friday and Saturday will be expected closer to normal. Partly cloudy conditions will persist for much of this time period, mostly in the mid-to-upper levels as the result of an area of low pressure located over the Great Plains. Cloud cover will increase Saturday afternoon as the low begins to move into the Midwest.

The low pressure system will make its way over central Wisconsin on Sunday. Winds are likely to increase to 15-20 mph sustained with gusts approaching 30 mph out of the South/Southeast. A warm front will extend to the East from the center of the low, though the front will remain to the South of the track, which will keep temperatures a few degrees below normal, and the afternoon high the coolest of the weekend. There is a likely chance for showers and thunderstorms associated with the system, which is expected during Sunday afternoon; however exact timing of the rainfall is still a bit uncertain. What is somewhat certain is that if rainfall occurs during Sunday's race, it will likely be a full wet race, as the forecast models predict an average rainfall total around 1/2" for the day.