By: Stephen McCoy
The forecast for Sunday at Watkins Glen has remained mostly consistent with the rest of the week's forecasts. Partly to mostly cloudy conditions will be present through much of the day, varying in height as the air aloft begins to saturate; westerly winds are expected to bring in moisture above the region. South to southeasterly winds at the surface will keep temperatures in the upper 60's to low 70's, but will also allow dew point temperatures to approach 60 °F as moisture moves in from the Atlantic. The saturated atmosphere coupled with minor lifting could result in some scattered showers through the region in the afternoon; a surface trough approaching from the northwest is expected to bring a larger chance for precipitation overnight.
By: Stephen McCoy
Some minor changes in this update for Blancpain GT World Challenge America at Watkins Glen, though the general setup remains similar to the initial forecast.
A cold front from a surface low pressure system over Hudson Bay is expected to pass through the region on Friday, bringing a slight chance for isolated showers and/or light rain. West to southwesterly winds ahead of the front will cause near-average temperatures for the day. After the frontal passage, northwesterly winds will cool temperatures to the low-to-mid 50's overnight. With dew point temperatures similar to the air temperatures, there is a possibility of fog in the area Saturday morning; temperatures will rebound to the mid-to-upper 60's. High relative humidity values in the upper and lower levels will result in partly to mostly cloudy conditions through the day.
A surface high pressure system will build into the region on Saturday behind the front, then move off-shore on Sunday. As it leaves the area, a stationary front is expected to setup to the north of the track, causing surface winds to shift to the south to southeast. Westerly winds in the rest of the atmosphere will bring moisture over the region, with much of the air aloft fully saturated. As a result, precipitation chances are higher than in the initial forecast; model guidance suggests the highest chance for showers near or after mid-day.
By: Stephen McCoy
Cool temperatures welcome the Blancpain GT World Challenge America paddock at Watkins Glen this weekend after a cold front moves through the region on Friday. The front will bring a slight chance for isolated showers, while a slim increase in chances is present on Sunday.
A surface low pressure system currently centered over western Ontario is expected to track northward through the remainder of the week. A cold front from the system will move through the mid-Atlantic region Wednesday into Thursday, resulting in a chance for rain and bringing cooler temperatures to the region. As the low moves over Hudson Bay, it is anticipated to stall, with a second cold front forming to the southwest of the center. Approaching Friday, the latter cold front will move through the northeast US, with a slight chance for isolated showers occurring along the frontal boundary. However, precipitation amounts are unlikely to be as much as the initial front due to the former utilizing most of the available moisture in the region. Southwesterly winds ahead of the front will allow temperatures to rebound into the mid-70's during the day before falling near 50 °F overnight behind the front.
On Saturday, winds will shift to the northwest behind the front, causing high temperatures for the day in the mid to upper 60's. Moisture in the low levels will cause some partly to mostly cloudy conditions during the day, however high pressure and dry air at the surface will ensure no precipitation will occur. On Sunday, the high pressure system will move off the Atlantic coast, causing winds from the south to southeast. Moisture from the ocean will move in throughout the atmosphere, bringing a slight chance for showers during the day.
By: Stephen McCoy
Conditions have dried out for Sunday and the remainder of the weekend will stay warm with high temperatures hovering around 80 F. As mentioned in the previous forecasts, for Saturday expect surface winds from the north to northwest as due to the anti-cyclonic rotation around a surface high pressure system over the Pacific Ocean. Low level winds from the west will result in mostly cloudy skies during the morning; winds will shift to the north to northwest during the afternoon. An upper level trough is still anticipated to be located over the Pacific, causing winds from the southwest over the region and ultimately mostly cloudy skies will be present through the afternoon. For Sunday, recent model runs have shown low level winds more from the northwest, which will cause drier air and clearer conditions through the day. However, with the region still on the downstream of the upper level trough's axis, partly to mostly cloudy conditions will likely persist.
By: Stephen McCoy
Conditions remain mostly unchanged for this weekend's Rose Cup Races at Portland International Raceway. The atmospheric set-up remains consistent with the initial forecast for the most part. However, the ECWMF has followed the GFS in showing winds more from the west on Sunday which will bring a slight chance for scattered showers near mid-day to the afternoon as moisture moves into the region from the Pacific; dry air in the mid levels will keep any convective precipitation from occurring. This is primarily due to the latest model output bringing the surface low pressure system mentioned below closer towards the coast which will then have a larger influence on the surface and low level wind direction than the surface high pressure system. Otherwise, conditions remain mostly identical, especially on Friday and Saturday; the atmospheric set-up is unchanged and can be found in the next paragraph, copied over from the initial forecast.
For Friday, a high pressure system at the surface will be located in the eastern Pacific with a surface low pressure system directly to the north, off the coast of Canada. The area of high pressure is expected to have a larger influence on the surface winds in the area, with them coming from the north to northwest through much of the weekend. With the systems extending into the low levels, the area between them will act as a funnel for moisture; the cyclonic motion around the low an the anticyclonic motion around the high will cause low level winds from the west. The moist air will condense as it moves up the mountains to the west of Portland, resulting in mostly cloudy conditions in the low levels during Friday morning; drier air from the northwest will cause some slightly clearer conditions in the afternoon. However, an upper level trough centered over the Pacific will bring moisture to the region from the southwest, resulting in mostly cloudy conditions in the upper levels for the remainder of the day. Conditions on Saturday are expected to be mostly the same, though low level winds are anticipated to continue from the west, causing mostly cloudy to overcast conditions in the low levels throughout the day.
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.