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.
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. By Doug Schneider Not a whole lot has changed since Monday's forecast, which is good news if you're attending the Honda Indy Toronto race weekend. Friday and Sunday continue to look great, and Saturday doesn't look bad either aside from a small chance of a shower during the day. Model agreement on the pattern has been good and consistent over the past few days, so my confidence in this forecast is high.
Thursday continues to look like a wet day in Toronto as teams set up at the track. That low pressure system will clear the area in plenty of time before the on-track activity starts on Friday morning. High pressure will be extending across the Great Lakes, providing a north wind that will supply pleasant temperatures and a dry air mass. Another low pressure system is expected to approach the area from the west on Saturday, with the cold front pushing through in the evening. Ahead of the front, scattered showers are expected, with a few isolated thunderstorms possible. As it stands today, the timing of the best chance of rain in Toronto is probably in the middle of the day, between 11 am and 4 pm. That timing could shift a little either way as we get closer to Saturday. I expect that if rain does fall at the track, it will be fairly light and not last for a long time, so the impact on the action should be low. Lightning strikes in the area would be my biggest concern for interruptions, but the chance of that happening appears low. Behind the front on Sunday, temperatures will be cooler with a north wind, and skies will be mostly sunny through the day with drier air building in. You couldn't ask for better weather for a race. By: Stephen McCoy The same general set-up will be present for the weekend at PIR, though Saturday and Sunday look to be a bit cooler than on Friday. The models are a bit iffy on the chance of precipitation on Sunday, but with only a handful to base the forecast off of this early, the next update will likely bring changes.
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. Sunday shows much of the same as the rest of the weekend, though it does bring a very minor chance for scattered showers. The GFS is currently the lone model anticipating precipitation as a result of winds throughout the atmosphere from the southwest. Though it is the only one to show showers during the day, I wanted to include the output in case the models starting trending towards the same output before the next update. Regardless, I'm sure that Sunday's conditions will change, hopefully for the better. By Doug Schneider A series of upper level disturbances will be moving across Ontario this week, one of which will cross the area on Saturday. The good news in the forecast is that two of the three days of Honda Indy Toronto are expected to have nice weather, and even the chance of rain on Saturday isn't that high.
The most significant rain of the week is expected on Thursday as teams load into the track but before any on-track sessions begin. A fairly strong trough and cold front will pass through on Thursday, with some potential for heavy rainfall. This system will be clear of Toronto by the time on-track sessions start on Friday morning. Friday will be a nice day with mostly sunny skies and highs in the upper 70s F, or mid 20s C. A weaker trough is expected to cross the area on Saturday. This far out in the forecast, timing is uncertain, but the best chance appears to be in the afternoon and evening as daytime heating creates some instability while the upper trough approaches from the west. Some thunderstorms will be possible as well, which may result in a stoppage of some sessions. With the uncertainty of timing of the trough, it is possible that some showers could linger into Sunday morning. From what I'm seeing today, it is more likely that the chance of rain ends before sunrise on Sunday, but I can't rule out a morning shower completely. In either case, the majority of the day should be quite nice, with decreasing clouds and temperatures peaking in the lower 80s F or upper 20s C. By Scott Martin For today, skies will be partly to mostly cloudy throughout the day with warm conditions. There will be a slight risk of a passing shower or thunderstorm during the late afternoon through the evening hours, with the rain chance topping out at 30%. The afternoon high will be around 28C (83F). Winds will be out of the north-northwest at 8-16 KPH (5-10 MPH).
Sunday will be a much brighter and cooler day at CTMP. Skies will start off mainly sunny and will be sunny throughout the day. There is no chance of rain and winds will be out of the east-northeast at 8-16 KPH (5-10 MPH). The afternoon high will be around 24C (76F). By Scott Martin Latest high resolution guidance keeps it partly cloudy and very warm at CTMP through much of the day today, but some thunderstorms may develop off to the west during the mid to late afternoon hours. Those may affect the track late in the afternoon and into the early evening hours, but the chance of rain at this point is only 30%. Afternoon highs will top out in the upper 20s to near 30 C (mid-80s F). Winds will be out of the south-southwest at 8-16 KPH (5-10 MPH).
Guidance continues to show some scattered shower and thunderstorm activity around the track during the morning hours before they all get pushed off to the south by the early afternoon hours. Skies will start off mostly cloudy, but clouds will begin to diminish during the afternoon hours, possibly a little earlier. Highs will top out in the upper 20s to near 30 C (mid-80s F). Chance of rain is only 30% for now. Winds will be out of the north-northwest at 8-16 KPH (5-10 MPH). Sunday will be an absolutely beautiful day at CTMP... Skies will be mainly sunny with a passing cloud or two possible, and temperatures will be more mild. Highs will be in the mid-20s C (upper 70s F). Winds will be out of the east-northeast at 8-16 KPH (5-10 MPH). Radar will be up and running this morning and throughout the weekend for the event. Have a great day! By Scott Martin An active pattern over southern Ontario will keep a chance of showers and thunderstorms in the forecast for Friday, with a chance of showers lingering over into Saturday. On Saturday, skies will be partly cloudy and there is a chance of a passing shower or thunderstorm. Afternoon high will top in the upper 20s C (mid-80s F). Winds will be out of the south-southwest at 8-16 KPH (5-10 MPH). The chance of rain is around 40% at this point.
Saturday will feature cloudy skies and warm temperatures with a chance of a few passing showers. Highs will top out in the upper 20s C (mid-80s F). Winds will be out of the north-northeast at 8-16 KPH (5-10 MPH). The chance of rain is around 40%. Sunday looks to be a fantastic day with plenty of sunshine and milder temperatures. The afternoon high will be in the mid-20s C (upper 70s F). Winds will be out of the east-northeast at 8-16 KPH (5-10 MPH). There is no chance of rain at this point. I want to apologize for all of those auto posts of severe weather occurring in Alabama on my Twitter feed @RaceWx4You. I made a mistake in activating that on both of my feeds, so it has been removed from RaceWx4You. Sorry for the inconvenience. With that being said, all Racecast Weather forecasts will be out on @RacecastWx. Have a great evening and Godspeed. |
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