1:30 PM MDT, Friday August 16, 2019
The atmosphere over Colorado should continue to be dry with little or no monsoon influence through Monday. The only exception is that a surge of slightly moister and less hot air moved into eastern Colorado from the Great Plains this morning. That should enhance the chances of thunderstorms a little, mainly east of I-25. The chance for thunderstorms Saturday and Sunday will be very small, and afternoon temperatures in the low elevations are likely to climb to the 90s. Vegetation has become dry so be especially careful with fire.
There is indication that a surge of monsoon moisture from the Pacific Coast of Mexico might arrive in the middle of next week. It’s not looking like a very impressive surge of moisture, but it may be enough to increase the chances for widespread showers.
3:20 PM MDT, Friday, August 9, 2019
For those who like to get some high country hikes in this time of year, you may be familiar with the tendency for afternoon lightning associated with monsoon-pattern thunderstorms. Those will be around this Saturday and Sunday for both the mountains and plains. So keep an eye to the sky. But for several days now the indications have been for a dry period with the monsoon moisture pushed to the south of Colorado beginning on Monday and possibly lasting all week. That would mean warm conditions with lower than average chances for late day thunderstorms.
6:15 AM, Thursday, August 1, 2019
An area of high atmospheric moisture is moving across Colorado today. This will increase the amount of afternoon clouds and thunderstorms and keep the afternoon temperatures cooler than what we have seen lately. A few areas in the Front Range and eastern plains regions will probably see some heavy rain in the thunderstorms, so it is good to keep an eye out for localized flash flooding this afternoon and tonight.
The high moisture content of the atmosphere will decrease as we go into the weekend, so although the chance for thunderstorms will remain, the coverage of thunderstorms should decrease after today.
The Southwest monsoon
Moisture in the mid and upper levels today is connected with the tropical Pacific off the West Coast of Mexico. This pattern is relatively common in to mid to late summer and is referred to as the Southwest Monsoon or the Mexican Monsoon. Although it has been around intermittently for a couple weeks, today it is being combined with low level moisture from the Great Plains. That’s why we are in an somewhat enhanced risk that some thunderstorms may produce high rainfall rates.