Another significant spring storm will develop over the great basin Saturday night and Sunday and then lift northeast across western Wyoming Sunday night into Memorial Day.
Saturday...scattered showers...mainly across northern Wyoming... with a few isolated thunderstorms possible. Rain will develop across the southern half of Wyoming late Saturday.
Sunday...precipitation will spread north Sunday morning. Precipitation in the valleys and basins will fall primarily as rain east of the divide...and changing to snow in late in the west as the snow level drops to around 6000 feet Sunday night.
Memorial Day...precipitation will linger into Memorial Day with the most significant precipitation expected across the northern and western mountains where it will fall in the form of snow. Temperatures may be cool enough east of the divide for snow or a rain snow mix to fall east of the divide. Precipitation will begin to taper off Monday night.
Between 0.25 and 1.5 inches of liquid precipitation is likely to fall with this system. The heaviest amounts will fall in the Wind River and Bighorn Mountains...while much less will fall across southeastern Wyoming. In the mountains...this will translate to 6 to 12 inches of snow...with locally higher amounts possible in the Wind River and Bighorn Mountains...further adding to the well above normal snowpack. Travellers should be prepared for winter driving conditions Sunday and Monday.
Early model runs indicate a warming and drying trend beginning Tuesday across all of Wyoming. Highs Tuesday may approach 70 degrees... and gradually warm to near 80 by late week. This type of warm up would increase snow run off and increase the potential for flooding by late next week. Stay tuned as details on this situation develop.