By: Harris Cooley

A mostly clear weekend is in store for the Italian GP at Monza this weekend with very light winds and partly cloudy skies. Upper-level winds are conducive for afternoon showers in the area, but the chances are quite low as these showers would be short-lived anyway. Sunday should have a nice, clear afternoon for the drivers to show their stuff. Higher pressures loom over the surface of the region keeping drier air in the area. The main threat will be tire/track temps heating up should the cloud coverage dwindle. A metric graphic is posted below...

By Scott Martin

Unfortunately, it looks like we will be dealing with storms today as the 8:30 am radar shows strong to severe storms northwest of the St. Louis metropolitan area and is pushing to the southeast. Models do not have this activity diminishing anytime soon. Maybe, just maybe, we can get enough of a dry slot to set up this evening for cars to hit the track, but the risk of scattered storms remains high through the remainder of the day. The good news is that Sunday will be a brilliant day with plenty of sunshine and lower humidity. Sunscreen and shades are highly recommended. Please stay weather aware today.

By Scott Martin

Looking at the latest model runs for this weekend, we may have to put up with a passing storm on Saturday as a cold front will be working through the area, but will make it feel much nicer and less humid on Sunday. The good news is that the models are not too bullish on the rain activity on Saturday, but convective storms are usually not handled well by the models sometimes. I'll keep a chance of storms in the forecast on Saturday afternoon and early evening.

Sunday will be a very nice day with temperatures in the lower 80s and low humidity. There will be a mix of sun and clouds, and I just can't rule out an isolated shower during the afternoon to early evening, but with the amount of dry air in place, chances will be very, very low.

By Doug Schneider

Some changes were made for this forecast update for IMSA's VIR weekend. While the chance of rain has lowered on Saturday, the chance has increased on Sunday. 

The models have not done a great job with how they handle a cold front that moves southward through Virginia and North Carolina this weekend. This makes for an uncertain forecast. What I am confident about is that temperatures on Friday will be hot, with highs in the mid 90s and a heat index around 100 to 105. Most of the day will be dry, but there is a slight chance of showers and storms moving into the area late in the day, mainly after 5 pm.

A weak front or low pressure trough will be associated with these showers, and will move through in the evening hours. It will shift winds to the north, and bring slightly lower humidity for Saturday. There will still be some instability in the afternoon that may allow for isolated showers and storms to develop. Again, most of the day will be dry, with only a small chance of showers late in the afternoon. 

Another front moves in from the north on Sunday, and may initiate showers and thunderstorms in the afternoon. With more cloud cover, temperatures will be cooler, in the 80s. 

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.