Category: Forecast (Page 135 of 166)

DayCAST: Thu 07/27/17

July 27, 2017 / Ben Castellani

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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This week in weather: July 24, 2017

July 24, 2017 / Ben Castellani

Much of our region has missed out on the monsoon thunderstorms so far. As we move into the last week of July, Boulder’s monthly rainfall total rests at just 0.32″. Normal for the month of July is right around 2″, so this is well below average. The week ahead will offer a resurgence of monsoon moisture to northeast Colorado. However, as always, not everyone will see the much needed soaking rains.

Introducing SummitCAST, hiking forecasts for Colorado’s high country

July 18, 2017 / Ben Castellani

Today we are excited to announce the launch of SummitCAST, our cutting-edge suite of localized forecasts for Colorado’s top hiking destinations. Read on for all the details and begin planning your next alpine excursion using the BEST mountain forecasts currently available!

To celebrate the launch of SummitCAST, through July 31st use the promo code SUMMIT to receive a 33% discount on an annual subscription to BoulderCAST Premium. The final price is just $26.80 per year!

This week in weather: July 17, 2017

July 17, 2017 / Andy

A rather benign period overall is headed our way with high pressure in place through most of the upcoming week. However, we will need to be on the lookout for thunderstorms toward the latter part of the week with the return of monsoonal moisture. Prior to that, heat will be the story. Read on for our detailed weekly forecast.

This week in weather: July 10, 2017

July 10, 2017 / Ben Castellani

This week we discuss the arrival of the summer monsoon which will facilitate some of the best chances of rain we have seen in weeks.

Tracking the arrival of the summer monsoon

July 6, 2017 / Ben Castellani

With the first full-week of July coming to a close, monsoon season is right around the corner for northeast Colorado. However, its arrival is not something you can mark on the calendar as there is no set date for its commencement. It fluctuates substantially from year to year, depending greatly on the weather patterns of Mexico, the southeast USA, and the tropical eastern Pacific Ocean. We discuss the current state of the atmosphere and when we expect the monsoon to finally arrive. It’s already running a tad late.

This week in weather: July 3, 2017

July 3, 2017 / Andy

It’s hard to believe that the first week of July is already upon us. Soon we will be talking about the arrival of the summer monsoon. For now though, heat will be the story much of this week, with a few if any storms to speak of. We also discuss the forecast for the Fourth of July holiday and the possibility of 90’s lingering longer than anyone wants. Read on for the details.

Forecast for Bike to Work Day 2017!

June 27, 2017 / Ben Castellani

The last Wednesday in June has arrived, the day when thousands of hard-working citizens take to the bike paths for their morning and evening commutes. Yes, it’s Bike to Work Day 2017 tomorrow! Five out of the last ten Bike to Work Days have seen measurable precipitation in Boulder. How does tomorrow’s forecast look for the Metro area? Read on to find out if the bikers will be getting wet this year….