Monthly Archives: October 2019

Snow then record cold Wednesday night through Friday morning

12:30 PM MDT, Tuesday, October 8, 2019

A strong cold front Wednesday evening will bring in unusually cold weather, with record lows likely on Friday morning. Wintry precipitation is likely Wednesday night and Thursday bringing the first measurable snow of the season to the lower foothills and plains.

 

Snow:

Low clouds are likely to increase rapidly Wednesday evening following the arrival of the cold air. Some areas of light freezing drizzle or snow are likely Wednesday overnight (maybe some rain at the start).  Precipitation on Thursday is likely to be snow. This is not a classic upslope event with east of northeast winds through the depth of the mountains. The main snow will likely be a southwest-to-northeast band that moves southward through the area (oriented with the upper air jet stream). There may be a brief period of moderate or heavy snow with that band. Right now it looks like timing of the snow band will be Thursday morning for areas north of Denver, and maybe late morning and early afternoon from Denver south. This timing may shift by a few hours as we get closer to the storm.

 

Likely accumulation:

Foothills and plains: 1-3 inches in most areas (local areas up to 5″ if the snow band slows or stalls briefly)

Near the continental divide: 3-7 inches.

 

Cold:

The front will probably be through Cheyenne in the late afternoon Wednesday and then move rapidly down the Front Range late Wednesday afternoon through early evening. Temperatures are likely to plunge to the 20s Wednesday night, and remain near or below freezing on Thursday. Under clear skies and likely snow cover Thursday night we will likely see record lows by Friday morning.

Friday’s record for Denver is 22 set in 1946.

Friday’s record for Boulder is 20 set in 1977.

Friday’s record for Cheyenne is 15 set in 1977.

 

 

Wednesday cold front to bring hard freeze and probably snow

4:25 PM MDT, Sunday, October 6, 2019

A strong cold front late on Wednesday will bring widespread freezing temperatures by Thursday morning and a good chance for the season’s first measurable snow across the lower elevations on Thursday.

 

After the likelihood of scattered frosts tomorrow morning (Monday) the first part of the week should be pleasantly warm for early October. That should come to an end late Wednesday afternoon or evening. Temperatures in Colorado Springs-Denver-Boulder-Fort Collins- Cheyenne will likely drop below freezing Wednesday night, possibly stay below freeing Thursday, and could be down in the teens Friday morning.

 

It appears that there may be a period of snow that accumulates on Thursday (maybe beginning Wednesday night as rain changing to snow). Right now the potential accumulation looks fairly minor (trace-3 inches). But we should watch how that develops since more than 3 inches this time of year could result in broken tree limbs.

Windy cold front, then dry & cool weekend

6:20 AM MDT, Friday, October 4, 2019

A Pacific cold front should move northwest-to-southeast across the Front Range region this evening, but with little or no precipitation. However, gusty west to northwest winds are likely to accompany and follow the cold front this evening into Saturday for parts of the region. The higher mountains and west slope did not benefit from the cool drizzle earlier this week, and so the dryness combined with the gusty winds may elevate the risk of wildfire in those areas.

 

After the period of gusty winds, it should be a dry weekend with chilly mornings and mild afternoons. Temperatures for Colo Springs-Denver-Boulder-Fort Collins-Cheyenne are likely reach the 60s during the afternoon and drop to the 30s at night. There may be some local frosts either Sunday or Monday morning once the wind dies down, especially in some of the cooler river valleys. Warmer weather is likely next week until the next cold front around midweek.