textproduct: Grand Junction

KEY MESSAGES

- Unseasonably warm and dry conditions dominate the forecast through the middle of next week.

- While most remain warm and dry, periods of light precipitation are possible for the northern mountains midweek onwards.

SHORT TERM /THROUGH SUNDAY NIGHT/

Issued at 200 PM MST Sat Dec 13 2025

Ridging remains overhead with mostly sunny skies noted. Temperatures continue their run of above normal values and that will continue through the weekend. Some cloud cover overnight may temper the cold temperatures and fog banks that we've seen in some of the colder valleys but outside of that, little else going on.

LONG TERM /MONDAY THROUGH SATURDAY/

Issued at 200 PM MST Sat Dec 13 2025

Predominately zonal flow dominates the western CONUS to begin the work week next week, though a brief shortwave still looks on track to arrive on Monday. There is still no indication that any notable moisture will accompany this feature though, so the expectation remains that some cloudier skies will be all to develop during this period. In this quiet pattern, look for temperatures to remain abnormally warm through the week, upwards of 15-20 degrees above normal.

We're still keeping our eye on the mid-week period and onwards for the potential of another bout of precipitation. Current ensemble IVT forecasts are hinting at two rounds of AR moisture transiting through the Intermountain West, one in the mid-week and one towards the end of the week. With upper-level flow mostly westerly throughout the week though, we aren't favored to reach much of this anomalous moisture as the bulk of this stream will dissipate by the time its southwards descent reaches us. The NBM is still placing a 70+% probability of measurable snowfall across the northern and central Colorado mountains for Wednesday, but the chance for anything more than a few inches is looking fairly low at this point. Early projections for the late week storm are looking a little more promising (with an emphasis on "a little"), but with a week until this system hits, models aren't in much agreement and guidance could shift one way or the other. We will continue to monitor both systems, and further information will become available over the coming days as model guidance comes into better agreement.

AVIATION /00Z TAFS THROUGH 00Z MONDAY/

Issued at 441 PM MST Sat Dec 13 2025

VFR conditions are expected to prevail through the forecast period. Winds will generally be light, but may increase overnight at a few sites. Ground fog could develop at KGUC around 06Z, but confidence is low. High level cloud coverage will increase overnight and through tomorrow afternoon.

GJT WATCHES/WARNINGS/ADVISORIES

CO...None. UT...None.