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Cooler this weekend, with some thunderstorms

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.

Heat Wave into Saturday

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.

Typical July weather for the 4th

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.

Summer weekend: some heat, but some clouds and thunder too

2PM MDT, Friday, June 28, 2019

Today may be the hottest and driest of the next three days. Temperatures along the urban corridor on Saturday are likely to exceed 90 again in most areas, but there will be a bit more moisture in the atmosphere which means that some clouds and thunderstorms might take the edge of the heat during the afternoon in some spots. ¬†On Sunday a little more moisture in the atmosphere will likely lead to more widespread thunderstorms in the afternoon and evening. Afternoon temperatures on Sunday probably won’t get all the way to 90 for many areas, but it should still be a warm day. That pattern is likely into early next week: near average temperatures and some afternoon and evening thunderstorms for some spots.

Cold front then rain for the summer solstice

5:30 AM MDT, Thursday, June 20, 2019

The summer solstice occurs tomorrow, June 21st at 9:54 AM MDT. But the official start to summer won’t be accompanied by classic summer weather this weekend. Average maximum temperatures this time of year in Fort Collins-Boulder-Denver-ColoradoSprings is low to mid 80s. We are likely to be 10-15 degrees below that for our maximums this Friday to Sunday.


There is a slight chance for a thunderstorm this afternoon, but most areas will stay dry. Behind the cold front on Friday there is a much better chance for showers and thunderstorms in the afternoon and evening, with some areas of rain or drizzle lingering into Saturday morning. Saturday and Sunday will likely see more scattered showers, mainly late in the day.


For those wondering when we are going to get a stretch of hot weather, your wait may be almost over. It appears that by the middle of next week we will be in a pattern of generally dry weather with average to above average temperatures. At least right now it looks like the first 90-degree days may occur before June is over.

Thunder, wind, maybe some rain

1;40 PM MDT, Friday, June 14, 2019

Today will be the last very warm day for a few days, although it’s not likely to get very cool. Expect the weekend to be a little below the average (average high temperatures for mid June in Boulder-Denver is low 80s).


The atmosphere is unstable today, but not very moist in the low levels. So incidents of heavy rain and hail in thunderstorms should be localized. Most areas probably won’t see significant rain, but are more likely to see gusty winds from thunderstorms outflows. It appears that Saturday will be a bit more moist, so there may be more coverage of rain in afternoon/evening thunderstorms, and then maybe back to a slightly drier trend on Sunday.



Cold front Saturday afternoon

5:30 AM MDT, Friday, June 7, 2019

Today should be a typical early June day with afternoon temperatures climbing above 80 in the lower elevations and the development of a scattering of afternoon/evening thunderstorms. Saturday will start out on the warm side of the cold front, but during the afternoon (maybe late morning in Cheyenne) we are likely to see a windshift to the northeast and a trend toward cooler temperatures. A generally cloudy period is likely late Saturday into early Sunday with some thunderstorms late Saturday and maybe some fog or drizzle Saturday night or Sunday morning. The clouds will probably break up during the day Sunday, but temperatures will likely remain below 70 for the highs Denver, Boulder, Colorado Springs and Fort Collins.


Although the shift to cooler weather will be statewide, the magnitude of the cool-down and the chance for rain will be lower in West Slope areas.