8 AM MDT, Saturday, July 19, 2019
When I blogged a couple days ago I said that Saturday may or may not see the continuation of the heat wave. Now it looks like Saturday will see a cold front pass through, probably by morning in Cheyenne and then morning to afternoon as you move south down the Front Range. So today will likely be the last in this stretch of days near 100, and then it will be 15-20 degrees cooler for high temperatures by Sunday.
There should be an increase in moisture behind the front, so expect some areas of clouds and thunderstorms Saturday and Sunday, especially afternoon and evening.
11:30 AM MDT, Wednesday, July 17, 2019
Hot and dry weather are in store through Friday, and possibly extending into Saturday. The atmosphere is quite dry so we can’t rely on the cooling from afternoon thunderstorms over the next few days. A cold front should slip through the Front Range region late Saturday resulting in a bit cooler weather on Sunday. The air mass behind that front should be a little moister too, so the chance of scattered thunderstorms may return Saturday evening and Sunday.
The record highs for today, Thursday, Friday, and Saturday in Denver are 102, 99, 101, 105, and in Boulder today through Saturday shows records of 98, 100, 100, 100. There is a small chance we could reach one or two of these, and a good chance we will get very close.
The weather pattern for this heat wave is a little odd. The atmosphere (including the upper air) over the Front Range is not unusually hot, but the lower levels are coming from the Desert Southwest and thus the near record readings. Next week the atmosphere is likely to be a bit warmer, but the lower levels won’t be coming from the desert, and some monsoon moisture may increase the chance for afternoon clouds. So although hot weather is likely to return after a brief cool-down on Sunday/Monday, it appears it won’t get quite as hot as the next few days.
3:50 PM MDT, Tuesday, July 2, 2019
Wednesday through Friday are likely to see typical early July weather in the region. For Denver, Boulder, Colorado Springs, and Fort Collins that means afternoon high temperatures in the mid 80s to low 90s. The chance for afternoon thunderstorms is likely to decrease Wednesday and Thursday, so some areas may get by with no rain at all.
As we go into the weekend, the pattern won’t change much except that the chance for afternoon thunderstorms might increase again which will shave a few degrees off the high temperatures.