Tag: monsoon (Page 3 of 5)

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.

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.

This week in weather: August 22, 2016

August 22, 2016 / Andy

After a wet end to the previous week, the weekend started out cool and concluded warm with highs approaching 90 degrees over the Plains on Sunday. This week will begin with above normal temperatures, but a cold front moving in along with subtropical moisture will increase our threat of rain and storms through the middle of the week. Once again our weekly discussion is riddled with mentions of rain, but as always, the extent and intensity for any given location remains to be seen. Read on for the full week-ahead forecast.

This week in weather: August 15, 2016

August 15, 2016 / Ben Castellani

As we rapidly sprint towards the end of meteorological summer and the conclusion of Colorado’s wet season, the weather for the week ahead will not sway much from what we have come to expect. Chances of rain will be there, but not substantial. We’re also tracking yet another fall-like cool-down just in time for the weekend. Continue reading for our outlook for the upcoming week.

This week in weather: August 8, 2016

August 8, 2016 / Ben Castellani

Following four days of unseasonably cool temperatures, this week begins warm as moderately-moist southwest flow dominates the region. By mid-week, moisture associated with two tropical cyclones spreads into Colorado alongside a cold front from the north. With this, we’ll see storm chances increase and temperatures fall once again. Read on for our complete weekly outlook.

Monsoon and cold front teaming up to end the week

August 4, 2016 / Ben Castellani

Cooler weather and beneficial rains are spreading across the Front Range as monsoon moisture collides with a cold front on our doorstep. Continue reading for rainfall amounts, timing, and when to expect that brutal August heat to return.