High Wind in Grand Valley, Colorado

The peak gust recorded during this event was to 71 mph at the Hallenbeck Reservoir DRI mesonet sensor at 3:15 AM MST 2/17. Gusts at or above 58 mph began as early as 6:45 PM MST 2/16, again with a gust at the Hallenbeck Reservoir site. A gust to 60 mph was recorded at the KGJT ASOS at Grand Junction Regional Airport at 1:33 AM MST 2/17. Additional gusts between 45 mph and 55 mph were recorded across the region during the period of high winds. No reports of damages, injuries, or fatalities were received in association with this event.

In the days leading up to this event, a strong trough made landfall along the West Coast of the US. Ahead of this system, unusually warm and dry conditions prevailed as high pressure dominated the Intermountain West. The trough began to track inland on the 15th into the 16th, but the high pressure was reluctant to shift east. This led to a tightening up of the pressure gradient between these two features, enhancing an already strong southwesterly upper level jet. Lift began to increase ahead of the trough on the evening of the 16th, with mountain rain and snow showers breaking out over the higher terrain of eastern Utah and western Colorado. This also helped to keep deep mixing ongoing well after sunset, resulting in some of the peak winds occurring between midnight and daybreak on the 17th. In addition, a potent cold front was associated with this system, and was expected to sweep through eastern Utah and western Colorado around daybreak. Ahead of the cold front, the surface pressure gradient tightened substantially and surface winds maxed out. This coincided with the period between midnight and daybreak on the 17th.