By Scott Martin - @RaceWx4You
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It's a championship-quality forecast for the final weekend of the season for the Verizon Indycar Series, as they visit the majestic Sonoma Raceway. Mornings will start off cool each day, but maximum sunshine will allow the temperatures to climb nicely to near 80 degrees each day. Wind will not be an issue for Friday and Saturday, but will be picking up to 10 MPH by Sunday afternoon. We won't even mention rain in this forecast.
For much of the week I thought that the remnants of Harvey would be swept out of here before the race weekend at Watkins Glen for the Verizon Indycar Series, but the forecast has changed drastically today.
Saturday will not be too bad at the track with partly cloudy skies throughout much of the day. Morning temperatures will start off pretty chilly and may bring a slight delay to morning on-track activities, but it will warm quickly into the mid 60s for the high. There is a very slight chance of a shower passing over the track after the noon hour, but the better rain chance will come during the late afternoon and early evening hours.
Sunday will be a pretty soggy day for the track, especially during the morning and into the early afternoon hours. It will be quite breezy at times as well, as the surface low formerly known as Harvey, passes nearby to the track. We do not expect any severe weather or lightning at this time, but definitely keep posted to the weather conditions through the day. Rain coverage should diminish for the mid-afternoon through the early evening hours, and maybe we can get a dry track for a little while. Afternoon highs will top out in the upper 60s.
Not much change in the forecast for the Bommarito Automotive Group 500 at Gateway Motorsports Park...
Great weather throughout the afternoon hours, with mostly sunny skies and highs in the lower 80s. That is how it will be for the first practice session at 4PM. Qualifying temperatures will be down in the mid to upper 70s, and final practice temperatures at 9PM will be in the lower 70s and dropping into the upper 60s by the end of the session.
Almost a near repeat of Friday's weather... Sunny skies throughout the day with temperatures topping out in the lower 80s. Temperatures will be dropping down into the mid 70s by the start of the main event at 8PM, and down into the lower 70s by the end of the race around the 10PM hour.
By Doug Schneider - @Race4caster
Not much change has been needed to the forecast I made on Monday, as I'm still expecting nice weather for the ABC Supply 500 on Sunday.
A cold front will move across the area on Friday, which will bring a good chance of storms that day. More stable air will build in at the surface behind the front, but an upper level trough will lag behind it and keep a slight chance of showers going into Saturday. There is a possibility of some isolated light showers around the track for the final practice session late in the day, but the showers should be so sparse and short-lived that I don't expect much, if any, impact. I think the timing of possible showers favors the late afternoon and evening hours, mainly 4 pm or later.
The models differ on how fast the trough will exit, and there may continue to be some showers into Saturday night. But I'm confident that any chance of showers will be gone by sunrise. Race day will be mostly sunny with pleasant temperatures in the upper 70s, and a northwest wind at 5 to 10 mph. Overall, a great day to be at the track.
Doug Schneider and Scott Martin 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/MRTI, IMSA, Pirelli World Challenge, World Endurance Championship, and Trans Am Series races, as well as major SCCA and NASA events.