|GFS sea level pressure (solid contours), 10-m wind, and integrated water vapor (color fill with warm|
colors indicating higher values) forecast loop valid 1200 UTC 22 Aug through 0000 UTC 26 Aug 2013.
In response to the moisture surge, the latest GFS forecast for the 48-hour period ending at 0000 UTC 27 August (6 PM MDT Monday 26 August) shows a narrow band of heavy accumulated precipitation extending from northern Baja up the Colorado River, and into southern and eastern Utah. Model generated precipitation exceeds 6 inches in that grey strip just south of the southern tip of Nevada.
It looks like Utah will also get in on the action. This is not a good time to be going slot canyoneering. The latest forecasts keep the juiciest air to the southeast of Salt Lake, but we still have a threat of thunderstorms. We'll see how this all comes together in the coming days.