By: Stephen McCoy
Conditions remain mostly the same for Saturday and Sunday at Sebring. Widespread fog is possible in the morning on Saturday though conditions will clear before mid-day. Partly cloudy skies are expected for the earlier portions of the day before transitioning to mostly cloudy skies as the cold front passes over. On Sunday, a slight chance for scattered afternoon showers is re-introduced as northeasterly winds are expected to bring moisture from the Atlantic to the region which will contribute to the chance for precipitation. However, chances are only at 20% due to output from the simulated reflectivity parameter of the NAM 3km model showing mostly scattered showers in the area with little to no rain occurring at the track.
By: Stephen McCoy
Temperatures in this update remain mostly consistent with the initial forecast, with high temperatures in the low to mid 80's each day. Dew point temperatures in the mid to upper 60's will cause heat index values in the upper 80's on Friday, and the mid 80's on Saturday and Sunday. The long-range models have shifted the chances for precipitation to Friday as moisture propagates over the region in the lower levels. However, due to the short-term models not showing any occurrence of rain through the weekend chances are only slight and if showers do occur, they will be mostly scattered.
A cold front is still likely to move southeast through Florida on Saturday, however instead of transitioning to a stationary front, it is expected to continue moving through south Florida into Sunday. Surface winds on Saturday will be mostly from the north with the approach of the front, with upper level winds from the west to southwest bringing mostly cloudy conditions to the region in the late afternoon to evening on Saturday. On Sunday, winds are expected out of the northeast as a surface high pressure system builds in over the southeast region. The winds will bring moisture off the Atlantic, resulting in partly to mostly cloudy conditions primarily concentrated in the lower levels of the atmosphere.
By: Stephen McCoy
Hot and muggy conditions await for the Michelin IMSA SportsCar Encore at Sebring this weekend with temperatures in the mid 80's expected each day. Partly cloudy with chances for precipitation are in the forecast for Saturday and Sunday after sunny conditions for Friday.
Zonal flow in the mid and upper levels of the atmosphere will be present through the day on Friday, bringing dry air from the west to the region. Some light cloud cover could be possible during the day as some moisture moves in from southeasterly winds in the lower levels. Surface winds also from the southeast will bring warm, moist air to the region, causing temperatures to reach the mid-80's with dew point temperatures in the upper 60's; subsequently, heat index values are likely to reach 90F.
Overnight Friday into Saturday, a surface low pressure system is expected to develop off the mid-Atlantic coast ahead of a strong upper level shortwave trough; a cold front will extend from this system to the southwest into the Gulf of Mexico. The surface low is expected to move to the northeast up the east coast of the US through Saturday, while the cold front is expected to slowly move to the southeast. The front will likely reach Sebring in the mid-afternoon to evening, though due to it stretching from New England to the Gulf Coast, it will significantly weaken through the day. The weakened front is unlikely to affect the temperature for the day, however it is expected to provide enough lift to cause a slight chance for scattered showers or thunderstorms as it approaches the track. As the front passes, surface winds will shift to the north to northeast as high pressure builds into the southeast region.
Similar conditions are expected on Sunday as the cold front transition into a stationary front over central Florida. Surface winds will continue from the north and northeast, though wind speeds are expected to strengthen as the winds come off the Atlantic as opposed to over land. The stationary front will bring a chance for showers or thunderstorms to the region, especially in the afternoon and could have an impact on Sunday's race. Lingering moisture in the lower levels of the atmosphere will cause some partly to mostly cloudy conditions during the day, with cloud cover increasing in the evening.
By Doug Schneider
The remains of Hurricane Michael have cleared out of Georgia, and it has been a beautiful day at Road Atlanta, although it has been quite windy, with gusts around 30 mph. The Gainsville airport, which is located about 10 miles north of the track, recorded 2.68 inches of rain from Michael.
A cold front has moved through the area, and winds have shifted to the northwest as high pressure builds into the area. This high will continue to dominate the weather pattern over the Southeast through Saturday, which will provide really nice weather for racing Friday and Saturday. Temperatures will be comfortable in the afternoon, reaching the lower to mid 70s, and morning lows will be cool, in the lower 50s. Humidity levels will be very pleasant too. Winds will be lighter tomorrow around 10 mph), and even lighter on Saturday (5-10 mph).
Since I'll be at the track Friday and Saturday, and since the weather looks quiet, I don't plan to have another post here to update the forecast. I will have some posts on our Twitter and Facebook accounts, which you can find on the right. See you at the track!
By Doug Schneider
Click images to enlarge
The forecast for Hurricane Michael has stayed pretty much the same over the past couple days, and so my forecast for Petit Le Mans hasn't changed much either since Sunday.
Scattered light showers have been around northern Georgia today, and that will continue tonight, with showers becoming a little more numerous and heavier Wednesday morning. On/off showers are expected through the day, not directly associated with Michael. These showers should be fairly light, so I've changed the Impact Scale on Wednesday to low. I think the planned testing sessions that day should be able to be run without weather interruptions, although the track will likely be wet at times.
Michael will start to impact the track on Wednesday night. Here's a bullet list of impacts that can be expected from Michael at Road Atlanta:
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, Pirelli World Challenge, World Endurance Championship, and Trans Am Series races, as well as major SCCA and NASA events.