High-country residents may nervously watch snow melt and rivers rise this week, as smoke from distant fires continues to choke parts of Colorado, authorities said Sunday.

Cooler temperatures this weekend slowed the melt of a still-abundant snowpack, according to the National Weather Service. However, temperatures are on their way up again.

"As temperatures continue to be above normal, mountain snowmelt is expected to accelerate again," the National Weather Service said Sunday. "Mountain streams will continue to see high streamflows through the end of the week."

Jackson County is under a flood warning until 1:30 p.m. Tuesday, and Grand County is under a flood advisory until noon Tuesday.

Colorado's snowmelt usually peaks by mid-June, but only about 45 percent of snowpack in some areas has melted this year, forecasters said.

Smoke continues to suffocate other parts of Colorado.

Interstate 25 just north of the state line was closed Sunday because of heavy smoke from the 200-acre Track fire, which is burning within sight of the interstate near Raton, N.M.

The Colorado Department of Public Health and Environment forecasts "moderate" air quality across the state today, with "poor" visibility in Denver.

Fires in surrounding states have created a haze over Colorado for more than a week.

Smaller fires were burning in southwest Colorado on Sunday, but information was not available from local authorities.

A critical "red flag" fire danger warning is in effect until 9 p.m. today for much of southern Colorado, including the San Luis Valley, the Sangre de Cristo and Wet Mountain ranges, as well as El Paso, Teller, Pueblo, Crowley, Otero, Las Animas, Baca and Huerfano counties.

The Denver area has a chance of rain or isolated showers each day this week, according to the National Weather Service.

The best possibility for showers in the city is today, when the chance of rain is 30 percent, with a forecast high of 86 degrees.

High temperatures in the 80s are possible each day, including a forecast for 88 degrees Thursday.