Look for a relatively quiet last week of summer across the state with warm temperatures and dry weather being the main story. However, the forecast turns much different for the upcoming weekend. We’re also watching the Tropics for a few hurricanes that may impact the Eastern US. Read on for details.
Category: Tropical Weather (Page 15 of 17)
A warm and fairly dry week is expected across the Front Range. However, we’re once again watching the tropics this weekend for another East Coast landfall and one storm which could impact Colorado. Read on for details.
As the nation braces for impact of another major tropical cyclone, we update you on the status of Hurricane Irma. Where is she headed and when will she arrive? Read on to find out.
DISCLAIMER: This update was created Wednesday, September 6, 2017. Any life-sustaining decisions regarding Irma should be made on your own accord following the most up to date guidance from the local emergency authorities.
The week ahead starts off feeling like autumn thanks to yesterday’s cold frontal passage. We are rather quiet for the most part with only a slight chance of storms late in the week as temperatures moderate back into the 80’s. More details can be found within, including when we expect the wildfire smoke to exit the region.
We also provide thoughts on Category 5 Hurricane Irma which could be making landfall in Florida this weekend.
It’s been nearly two weeks in Boulder since our last measurable rainfall. Labor Day weekend will continue this trend with generally dry and at times, hot conditions prevailing across the state of Colorado. We provide our forecast of the entire holiday weekend for the Metro area and the Mountains.
The week ahead will be generally quiet across Colorado’s Front Range with large scale ridging in place and the window for monsoon moisture quickly waning. Read on to find out which day we think offers the best chance of rain.
We also provide thoughts on the recent landfall of Category 4 Hurricane Harvey in Texas.
How about that slow-moving monsoon storm last night in Boulder….definitely our most intense rainfall since late last summer. Between 7and 9 PM, 0.5 to 1.0″ of rain was recorded as torrential rain pounded the city. The radar image from 7:42 PM is below, with the storm that affected Boulder circled in pink.
Radar image from Wednesday night at 7:42 PM. Monsoon storms!
Yesterday had a lot of solid meteorology working together to produce the heavier rainfall. Today we will not see quite as favorable of conditions. Moisture has dropped and the frontal boundary has pushed well south and east.
After morning sun, expect partly cloudy skies in the afternoon and storms forming after 2PM, first across the higher elevations. We expect storm coverage to be isolated across the Metro area, with scattered activity in the Foothills (especially south and west of Denver). Highs will remain cool in the lower 80’s.
Unsettled conditions will remain through the upcoming weekend, with at least isolated chances of storms each day.
Fujiwhara Effect!
While checking the health of our monsoon flow for this forecast, I noticed a rare phenomenon in the models that is expected to happen between two tropical systems off the western coast of Mexico in the coming days. It is known as the Fujiwhara Effect and it happens when two nearby low pressure systems (normally tropical cyclones) orbit each other and spiral closer together. You can see this happening in the animation below between Tropical Storm Irwin (left) and Hurricane Hilary (right). Here is some additional reading from Wikipedia on this rare effect if you are interested.
Animation showing a likely Fujiwara interaction between two tropical cyclones off the western coast of Mexico this weekend.
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With another month behind us, we once again have to talk about record warmth and continued drought for the Front Range. Is the weather pattern finally set to change as we begin the month of December? Read on as we examine Boulder’s climatology and consider the current state of the atmosphere to give our outlook for the next month. We also touch on the potential for a snowstorm next week.
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