- A surge of pre-Monsoon season moisture hits Colorado Saturday-Monday. Normal Monsoon season runs July-August.
- The areas most affected are the Western Slope and Southern Mountains of Colorado.
- Precipitable water increases to 200% of June 30-year average values.
- Bottom line: plan on smaller weather windows. Expect mountain thunderstorms by 10am or earlier across the Western Slope and Southern Mountains. And, overnight/morning rain is possible in the San Juan’s on Sunday morning and possibly Monday morning.
Colorado state climatologist Dr. Russ Schumacher says it’s a robust moisture surge by June standards:
Precipitable water % of normal on Sunday morning 6/19.
Hourly forecast for 13-14ers in the Central San Juan Mountains. Notice the rain and thunder chances (and south winds).