textproduct: Grand Junction

KEY MESSAGES

- Mostly dry conditions and seasonable temps on tap for Monday.

- Wetter weather returns to the region by Tuesday, with showers and storms possible each day through the end of the work week.

DISCUSSION

Issued at 1001 PM MDT Sun Sep 20 2026

DRIER THROUGH MONDAY:

A rather pleasant start to the work week with seasonable temperatures and dry conditions on tap for Monday. This is mainly due to a building high pressure system over the Great Basin.

PRECIPITATION CHANCES RETURN TUESDAY ONWARD:

By Tuesday, a low pressure system begins trucking its way across the Great Basin and Intermountain West. While this is occurring, a high pressure system will begin to set itself up over Texas. Both of these factors combined will act to draw Gulf moisture into the Desert Southwest. As a result, precipitation chances return to the forecast just in time for the first day of fall. PWATs appear to be 180-200% of normal for a good chunk of the CWA, with the highest values forecast to be south of I-70. This moisture stays in the area for a majority of the week. Therefore, precipitation chances will remain in the forecast for the foreseeable future, especially over the southern mountains. Coverage of showers and storms ebbs and flows each day, with some days seeing more widespread chances than others. As more HiRes guidance becomes available, we will have a better understanding of timing and coverage of precipitation each day.

AVIATION /12Z TAFS THROUGH 12Z TUESDAY/

Issued at 513 AM MDT Mon Sep 21 2026

Winds are expected to be light and terrain-driven throughout the TAF period. Some mid-level cumulus will move into the region throughout the afternoon, but cigs will remains about ILS breakpoints and VFR conditions will persist.

GJT WATCHES/WARNINGS/ADVISORIES

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