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Blog

Weather forecasting and analysis, space and historic events, climate information

Filtering by Category: DEN

**TS Melissa continues to drift over the Caribbean Sea...“major” hurricane status on the table...active pattern next week to feature powerful jet streak, intense blocking, cold air, and a hurricane**

Paul Dorian

Tropical Storm Melissa continues to drift today over the warm waters of the Caribbean Sea and will likely do so for several days to come. There has been no intensification of the tropical system during the past 24 hours or so as it is in an area featuring strong westerly vertical wind shear. Wind shear in the general vicinity of the circulation center of Tropical Storm Melissa is likely to diminish over the upcoming weekend which should allow for intensification of the system into a minimal hurricane, and a strengthening to “major” (category 3 or higher) hurricane status is certainly on the table by early next week. Ultimately, this tropical system will take a turn to the north - perhaps crossing over central Cuba - on its way to the western Atlantic Ocean. An active weather pattern next week will feature a powerful jet streak, intense blocking in the atmosphere centered over Canada, plenty of colder-than-normal air, an intensifying upper-level trough over the central and eastern US, and Hurricane Melissa. There is quite likely going to be some kind of interaction between the inland upper-level trough and the western Atlantic Ocean hurricane, and a “late in the game” turn to the northwest by the tropical system cannot be completely ruled out.

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6:00 AM | *Storm system approaches the area by the late weekend...brings colder, unsettled weather to the area early next week*

Paul Dorian

Seasonal temperatures are likely for another day and there can be afternoon and evening shower activity. The weekend turns slightly milder, but then a storm system approaches late Sunday and the overall pattern will begin to change. Colder weather conditions are likely during the early part of next week in the Denver metro region and there can be some rain and/or snow shower activity...up in the mountains snow is likely and there can be some accumulations. 

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**A powerful jet streak, intense blocking, cold air intrusion, and a likely Hurricane (Melissa)...ingredients for an energetic weather pattern from later next week into the following week**

Paul Dorian

The European model run on Monday morning produced some stunningly high rainfall amounts of a foot or more in much of the Mid-Atlantic region for the 5-day period ending on Saturday, November 1st. Meanwhile, the Canadian model run from Monday night featured what is likely to be a hurricane (Melissa) producing accumulating snow over some of the higher elevations of the Northeast US late next week after it shifts northwest towards the New England coastline and encounters an unusually cold air mass. While odds are against either of these scenarios coming to fruition, they do suggest to me that the models are correctly sniffing out the potential for some energetic weather from later next week into the following week and there are several ingredients likely to come into play for just such a pattern. The ingredients include a powerful jet streak that will push into the western US this weekend from the northern Pacific Ocean, intense blocking in the upper part of the atmosphere that is likely to develop across central Canada by the middle of next week, a cold air intrusion into the US from Canada, and a likely hurricane over the western Atlantic Ocean.

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**An energetic pattern setting up for late next week into early November...a cold air mass, tropical activity, and a “buckling” jet stream**

Paul Dorian

There have been some notable storms near the east coast during the late stages of October and early parts of November including Hurricane Sandy in 2012, the so-called “Perfect Storm” in 1991, and Hurricane Nicole in 2022 which made landfall in Florida. It is at this time of year where there can be a “last gasp” from the Atlantic Basin tropical season as water is still quite warm in places like the Caribbean Sea, and southwestern Atlantic Ocean. At the same time, there is often an increasing frequency of chilly air masses moving from Canada into the US warning us that winter is not too far away. It is this combination of a waning tropical season combined with increasingly winter-like chill that can cause volatile weather patterns in late October and early November and we could be setting up for something like that for late next week into the beginning of November.

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6:00 AM | *Cooler today following passage of a cold front and a noticeable west-to-northwest wind*

Paul Dorian

It’ll be some ten degrees cooler today compared to Sunday following the passage of a cold frontal system and the wind will be a noticeable factor blowing out of the west-to-northwest. Winds will lighten up in the overnight hours and temperatures are likely to bottom out in the middle 30’s and temperatures look to be rather seasonal through the rest of the week.

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