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Forecast for the NASA 25 Hours of Thunderhill

11/29/2015

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By Doug Schneider
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The final event on our forecast schedule this year is the 25 Hours of Thunderhill near Willows, California. And it looks like there will be a mix of wet and dry conditions through the event, with temperatures close to normal for this time of year in Northern California.

Paddock setup on Wednesday will be mostly cloudy with temperatures topping out in the upper 50s. A low pressure system will be approaching from the west on Thursday, which will likely bring some rain to the track for the testing session. It will be breezy as the low pressure system gets closer, with winds of 10 to 20 mph. The rain will likely continue into Thursday night and early Friday morning as the cold front moves through the area. The total amount of rainfall is expected to be between a half inch and one inch. At this time, I expect that most of the rain will end in time for the start of testing at 9 am Friday. Clouds will be decreasing through the day as the low pressure system exits and high pressure builds over the area.

Saturday will likely have the nicest weather of the event, with partly cloudy skies and high temperatures near 60 degrees. Right now, I am fairly confident that the entire 25 hours of racing will be dry. There is another low pressure system that will be approaching on Sunday, but it looks like any rain with this system will hold off until late in the day, well after the end of the race. 
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Friday forecast update: Trans Am and Classic 24 Hour at Daytona

11/13/2015

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By Doug Schneider
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Yesterday's high temperature at Daytona reached a balmy 87 degrees. Temperatures will be cooler for the rest of the weekend, but there's not much to complain about weatherwise (unless you're one of those people from Florida who thinks temperatures below 60 degrees are cold). 

Some fog will be around the track once again this morning, but like yesterday, it should be cleared out by 9 am or so. A cold front is located across southern Georgia this morning, and it will be moving through the area late today. Cooler temperatures will arrive tomorrow behind the front, along with breezy conditions. Winds will be 10 to 20 mph on Saturday, producing a headwind on the backstretch and a tailwind on the frontstretch. Gusts of 25 to 30 will be possible at times. Mostly sunny skies will continue into Sunday, with temperatures warming into the upper 70s.
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Tuesday forecast update: Trans Am and Classic 24 Hour at Daytona

11/10/2015

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By Doug Schneider
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Today's forecast looks pretty similar to the one I posted on Sunday, so the forecast is progressing as expected. I did bump temperatures up a few degrees as it looks like highs will reach between 80 and 85 Wednesday through Friday. The cold front that will pass through Friday night will not have any rain with it. However temperatures will be noticeably cooler on Saturday, and it will be breezy with north winds at 10-15 mph gusting to 25 to 30 mph at times. Overnight temperatures Saturday night will be on the chilly side for the Classic 24 Hour, dropping into the upper 50s.
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Forecast for Trans Am and Classic 24 Hour at Daytona

11/8/2015

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By Doug Schneider
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The weather looks absolutely picture perfect for the Trans Am Series finale and the HSR Classic 24 Hour at Daytona International Speedway next weekend. No rain is expected through the entire event, and I'm pretty confident that this dry forecast will hold up through the week as the models are in good agreement with each other and have been consistent over the past few days with the pattern.

A large area of high pressure will be across the eastern United States, providing sunny skies and pleasant temperatures as teams arrive on Wednesday. Temperatures will be even warmer by Thursday as the high pressure area moves south and east, and highs on Thursday will reach into the lower 80s.

A cold front will be crossing northern Florida on Friday, but its passage is expected to be dry. The only noticeable difference with the front will be a few more clouds and a shift of winds to the north. Cooler temperatures will arrive behind the front for Saturday, as highs will be in the lower 70s. It may be breezy as well, with north to northeast winds of 10 to 15 mph, gusting to 25 mph at times. This will be a headwind down the backstretch and a tailwind on the frontstretch. A low pressure system will be developing near Texas on Sunday, which will spread some high clouds into the area, but any rain with this system should hold off until Monday. 

For forecast updates on Twitter, follow @Race4caster. Updates will also be posted on the Racecast Weather Facebook page.
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Friday AM Forecast Update for Trans Am at COTA

11/6/2015

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By Scott Martin
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Sometimes you can get it right, and sometimes you can get it wrong. Looking back at the daily record from nearby Austin-Bergstrom International Airport, there was no measurable rain to speak of within the last 24 hours. And since there was no rain, the temperature were able to climb to the upper 80s.

At 6:40AM, there are showers south of the area continuing to push to the south. There is also a storm back off about 125 miles to the west-southwest of the track that is heading to the east-northeast. If those hold together, they should arrive sometime between 11:30AM and 1:00PM.

So for today, we'll go with cloudy skies with a chance of showers and thunderstorms. Highs should reach the lower 70s. Winds will be out of the northwest at 5-10 MPH. Chance of rain is 50%.

Saturday looks like it will be cloudy with showers and maybe a thunderstorm likely before 12PM. After that, skies will remain cloudy with a chance of showers and a thunderstorm. Highs should reach the mid 60s. Winds will be out of the north at 10-15 MPH, with gusts up to 25 MPH. Chance of rain is 60%.

I'll have updates on my Twitter feed (@RaceWx4You) if threatening weather approaches the area. Live radar is also up and running on our site at www.racecastweather.com. Have a great day.
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    Authors

    Doug Schneider, Scott Martin, and Stephen McCoy are race fans and meteorologists dedicated to providing accurate forecasts and timely weather updates at racing venues around the world. We forecast for IndyCar, Indy Lights, Pro Mazda, USF2000, IMSA, Blancpain World Challenge America, and World Endurance Championship, as well as major SCCA and NASA events.


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