26/08/2025
***Steady Light To Moderate Rain For Tuesday Night Through Wednesday Evening***
Good evening everyone, as our scattered afternoon storms come to a close from today we will notice a brief lull in precipitation across western valleys until Tuesday afternoon. Once the 6 am hour hits a strong push of southwesterly winds aloft will push in increasing monsoonal moisture into western Wyoming and along this moisture gradient scattered to widespread thunderstorms will like exist as weak elevated instability will be in place across the western counties. This first wave of precipitation appears to be short lived however as this will be due to a relatively sharp and quick moving boundary.
During the late afternoon hours however a stalling out mature upper low will get stuck over central Idaho through the overnight hours. This will put Western Wyoming under a zone of favorable difluence aloft to the east of the cut off low. This will allow for a widespread shield of light to moderate rain with embedded thunderstorms to improve act western Wyoming overnight Tuesday and into Wednesday.
In terms of precipitation amounts any favorable southwest facing slopes will be the winners of this event with areas such as Star Valley Ranch, Bedford and Turnerville doing the best with a zone of up to 1.5 inches of rainfall. A secondary maximum of up to 1.25 inches of rain will be likely through Thursday morning in the vicinity of the Willow Creek fire, Both Teton Counties in Idaho and Wyoming should see between .75 and 1.25 inches of rain from this event likely helping to extinguish some of the smaller fires and turning some of the larger fires to a smolder! Great news for local residents and firefighters!
Even better news is that it looks like persistent rainfall will continue throughout the next week daily(especially in the afternoon).
Note: In areas where fires have recently been burning or where they are currently burning an increased landslide threat will exist since there are not longer healthy tree roots holding the soil in place and with the amount of rain expected the soil will get quite heavy on top of existing lighter looser soils. Treat steep burn scars just like avalanche zones in the winter, don’t linger or park under them just keep moving and pull over once you have passed the burn scar. This advice doesn’t just apply to Wyoming it applies to anywhere that has recently seen fires in steep terrain.