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Another cold day across the region thanks to a persistent strong upper-level trough over northern Arizona. Below shows the 250 mb wind speed and jet streaks. A southern branch of the jet stream is stretching from New Mexico into the Dakotas. The proximity of the exit and entrance region of the jet over Colorado today and tonight will lead to …

The weekend starts off chilly. Below shows the 500 mb absolute vorticity this afternoon and evening. A trough of low pressure is situated across southeastern Nevada. The trough will further dig southward into Arizona and New Mexico over the next day and into early next week. The persistence of the trough will lead to several rounds of snow and rain …

On this Friday, another trough approaches from the west, bringing down another cold front. Below shows the 500 mb absolute vorticity for this afternoon from the GFS model. A trough axis is situated from Montana into Arizona, with a weak low pressure system over southern Utah. This trough will be moving east during the afternoon, bringing showers to the area, …

No more 80-degree days After highs in the lower 80's yesterday, the cold front moved into the Metro area last night around sunset, right on schedule. The front's passage brought a few light rain showers to the region, and even a few rumbles of thunder (southeast of Denver). Behind the front, temperatures quickly dropped into the 50's and now rest …

While Boulder and Denver reported just a trace of rain over the last two days from Rosa, parts of central Arizona saw severe flooding following 2 to 5" of rainfall, an extreme amount for the desert locations that were impacted. Here are the rain totals from Rosa's remnants across the Desert Southwest: Beautiful Wednesday, ending with a chance of rain …

Tropical Depression Rosa Tropical Depression Rosa is now located over central Arizona. You can see the weak rotation in the GOES-East water vapor animation below. Despite being 350+ miles away from the Metro area, plentiful tropical moisture is seen to be streaming into our area ahead of Rosa today (and yesterday), mainly in the mid and upper levels of the atmosphere. Most …

Another cold front has passed through today from the northeast. Below shows the HRRR model for 1 PM this afternoon in terms of surface temperature. Northeasterly winds will ensue for much of today, and low clouds will be with us again for much of the day, with partial sunshine possible later in the afternoon. As a result highs will only …