textproduct: Grand Junction

KEY MESSAGES

- Mountain snow returns tonight through tomorrow morning. A Winter Weather Advisory has been issued for the eastern Uinta, Elkhead, and Park Mountains.

- Freezing temperatures are expected to impact the Central and Lower Yampa River Basin Tuesday and Wednesday morning. Freeze highlights are in effect.

DISCUSSION

Issued at 1039 PM MDT Sun May 17 2026

WET AND COLD MONDAY:

On Monday, the low which has been driving this active weather pattern will be moving overhead. As temperature take a dive near sunrise behind the associated cold front, near-surface conditions will rapidly moisten up. This should be plenty enough to promote another day of widespread precipitation. In spite of the frontal boundary being draped across the CWA, forcing is overall unimpressive and instability is minimal due to the anticipated morning cloud cover region-wide. So look for Monday's stormy weather to be more stratiform. A few discrete storms cannot be ruled out though, particularly later in the afternoon as cloud cover disperses to a degree.

With temperatures dropping though, our focus is shifting away from severe weather potential towards another round of snowfall for our higher elevation locations. Snow levels are generally high (>9,000 ft) across the area, though further north from the eastern Uintas to the northern Colorado mountains, where cooler air has already been settling in, snow levels are expected to drop further (>6,000 ft). Accumulations could near a foot along higher elevation portions of US-191 in the Uintas, and Rabbit Ears Pass has ~50% chance of exceeding 6" of accumulation. Elsewhere in the CWA, snow totals will be lesser, but most mountain ranges are expected to sit at 2-6" of snow by the time the sun rises on Tuesday.

FREEZE POTENTIAL:

This frigid push brings more than just another round of late season snow, but will also cause more freeze concerns. The coldest conditions will occur on Tuesday morning. Much of the Yampa Valley River Basin is expected to see a hard freeze as a result during this period. Though temperatures begin to warm back up beyond Tuesday, Wednesday morning will also likely see below freezing temperatures in the Yampa River Basin, thus a freeze watch has been issued for CO001 and CO002.

AVIATION /06Z TAFS THROUGH 06Z TUESDAY/

Issued at 1142 PM MDT Sun May 17 2026

TAF forecasts over the next 12 to 18 hours will be compromised with low clouds and lowered visibility at times due to this Spring storm rolling through. Mountain TAFs may see snow mixed in a times but for the most part rain showers and lower clouds will mix MVFR/IFR conditions in with ILS/VFR. The system will be clearing out by late afternoon with mainly VFR conditions moving in behind. However will need to monitor the threat of lingering low clouds/fog in the wake of the system overnight.

GJT WATCHES/WARNINGS/ADVISORIES

CO...Freeze Warning from midnight Monday night to 10 AM MDT Tuesday for COZ001-002. Freeze Watch from late Tuesday night through Wednesday morning for COZ001-002. Winter Weather Advisory until 9 PM MDT Monday for COZ004. UT...Winter Weather Advisory until 6 PM MDT Monday for UTZ023.