By Scott Martin.

Today and Thursday out at Sebring will be days that you will need to be weather aware at the track as Hurricane Eta finally will start to approach the west coast of Florida tonight, make landfall by early Thursday, and the center moving off of the east coast and over the Atlantic by Thursday evening. Those outer rainbands will keep the area wet at times through Thursday night with the potential for wind gusts reaching 40-50 MPH, especially later this afternoon through sunrise on Thursday morning.

There will also be a risk of a few quick spin-up, tropical-type, tornadoes as Eta begins to move closer and eventually on-land. The Storm Prediction Center has Sebring in a level 2 Slight Risk for severe storms due to the threat of those tornadoes along with potentially damaging winds. This risk goes from now until 7:00 am EST. A Flash Flood Watch is also in effect from now until 1:00 am EST Friday.

The good news is nearly all of the activity will be out of the area for Friday and Saturday with only a small chance of a few scattered showers (30%) for Friday. Skies will be mainly sunny for Saturday and mostly clear going into the late-night hours on Saturday night.

I'll have radar up and running this morning for Sebring. Stay weather aware today and during the early morning hours on Thursday. Once Thursday night gets here, we can relax and get into race mode.

By Scott Martin

This is probably one of the most difficult forecasts that I have had to make since we've started Racecast Weather as we have Tropical Storm Eta that has no idea at all at exactly where it wants to go. This forecast can and will change if there are any drastic changes to the forecast track of Eta. At this point, I'll give you three scenarios as the forecast confidence is very low...

THURSDAY:  The GFS Model shows the center of Eta close enough to the west coast of Florida to keep cloudy, breezy, and rainy conditions over Sebring throughout the entire day. The European Model is much of the same story but is showing rain intensity may be less at times. NWS Tampa Bay (the official forecast office for the Sebring area) has a 50% chance of showers occurring mainly after 1:00 pm with winds gusting to 20 MPH at times. As of now, we'll say showers will be possible throughout the day with breezy conditions as winds will be out of the south to southeast at 10-15 MPH with gusts around 20 MPH. The morning low at sunrise will be around 74 degrees with the afternoon high reaching around 84 degrees. We'll go with 50% chance of rain for now.

FRIDAY:  The GFS shows the center of Eta drifting farther out west over the Gulf of Mexico which will bring a much drier day to the area with a good bit of sunshine. The European has a little more rapid movement to the west with Eta and almost agrees with the GFS. The NWS has in their forecast mostly sunny skies with a very small chance of a passing shower. All three of these are in close agreement so we'll go with mostly sunny skies with only a 20% chance of a passing shower during the day. The morning low will be around 73 degrees and it will warm to around 86 degrees for the afternoon high. Winds will be calmer out of the south at 5-10 MPH.

SATURDAY:  Eta will get caught up and absorbed into an approaching cold front that will be moving through Mississippi and Alabama during the late hours on Saturday, according to the GFS. This will keep Sebring dry throughout the day with this scenario. The European is relatively the same with the GFS and it keeps Sebring dry throughout the day. The NWS has it being sunny and very warm. We'll go with mainly sunny skies and warm with the afternoon high topping out around 86 degrees after starting off around 70 degrees at daybreak.

NATIONAL HURRICANE CENTER:  Unfortunately, as I was typing out this forecast, the National Hurricane Center has their official forecast track of Eta hugging the west coast of Florida as is will be moving slowly north-northeastward through the week and into the weekend. If this scenario plays out, rain chances will have to be increased for each day. 

If you notice how wide the cone of uncertainty is for Saturday, that will tell you how low the confidence the forecast is. It shows that the center could potentially make a landfall from as far away as Pensacola, Florida, to as far east as Bradenton and just north of Sarasota, Florida.

This will be an ever-changing forecast so I'll have updates throughout the week. Stay tuned.

By Doug Schneider

Beautiful California weather can be expected this weekend as IMSA heads to WeatherTech Raceway Laguna Seca. 

A large high pressure ridge will be over the west coast for the second half of this week. Through the weekend, this ridge will shift to the east, and a low pressure trough in the upper levels will approach from the west. The main affect of this will be temperatures that will trend warmer each day of the event, and a slight increase in high clouds on Sunday. 

Morning fog is often an issue at Laguna Seca, and while it can't be ruled out, it is too far out in the forecast to mention it as a problem at this time. Forecasting fog is difficult even a few hours in advance, so I'm not going to try to do it 4 to 6 days in advance. We'll see how that develops in later forecast updates.

By Doug Schneider

Not much has changed in the weather pattern shown by the models for this weekend in St. Petersburg, so the forecast that I made on Monday still appears on track (no pun intended). A low pressure system will be over the Gulf of Mexico, with a high pressure system over the eastern United States. While I can't rule out an isolated shower or thunderstorm in the area both Saturday and Sunday, I don't expect that they are likely to have an impact on the racing. Pop-up showers along the Florida coast are difficult to predict days in advance, so while they are possible in the St. Pete area, their coverage should be isolated enough to make the chance of one occurring at the track very low. Overall, it should be a good weekend for racing. 

By: Stephen McCoy

Much like was stated in the initial forecast, a trailing front from a surface low pressure system centered over Scandinavia will sit mostly stationary over the region on Thursday and into Friday. South to southwesterly winds along the frontal boundary will bring a likely chance for precipitation during the day, with some of the heaviest rainfall occurring in the later hours, near qualifying and/or the night practice session. Low level winds from the south to southwest will cause mostly cloudy to overcast conditions through much of the weekend.

A cold front extending from a low pressure system north of the British Isles is expected to move through the region on Friday, bringing another chance for showers ahead of it around mid-day. The front will weaken as it passes through, however low temperatures for Saturday morning are still expected to cool from Friday's, though not as severely as initially thought.

The weekend will round out with another cold front approaching the region from the west. Winds continuing from the south to southwest ahead of the front will bring slight chances for isolated showers on both Saturday and Sunday, though with lighter rainfall than seen earlier in the weekend. However, the front itself will bring heavier rainfall as it passes through Sunday, which could impact conditions in the final hours of the race, depending on the timing of the passage.