Behind the front that same day highs were 10-15 degrees cooler. It stalled west of the Magic Valley, and Twin Falls recorded a record high of 94 on the 17 th. The cold front ahead of the trough moved into western Idaho late on the 16 th. Temperatures quickly rebounded on the 16 th under southwest flow aloft ahead of the next trough. On the 15 th a record low of 26 was set at Burns. Twin Falls recorded a record low of 37 on the 14 th. The trough lingered through the 15th, keeping temperatures around 15 degrees below normal. Wind gusts from 40 mph to around 50 mph were observed at several locations. Local flooding was common around the region. A Mesonet stations near Featherville in Elmore County measured nearly 3 inches. In Harney County north of Andrews a Mesonet station at Little McCoy Creek measured 2.23 inches. The fronts triggered thunderstorms and heavy showers which dumped over an inch of rain at several locations. The cold front in advance of the trough was followed by a second front as the trough approached. On the 12th a deep upper level trough, which had tapped abundant subtropical moisture, pushed inland. On the 10th warm air spreading north from the Great Basin raised temperatures above normal. Rainfalls up to 1.25 inches were also measured. Hail up to 1.25 inches was reported at a number of locations. On the 5 th and 6 th an upper level trough weakened as it moved inland, but it retained enough moisture and energy to generate strong thunderstorms across much of southwest Idaho. Weather systems carried inland nearly daily showers from the 4th through the 8th. The first half of the month was dominated by westerly winds across the North Pacific which brought changeable weather to the northwestern U.S. Only Harney and Malheur Counties, the lower Treasure Valley, and the southwest corner of Owyhee County were wetter than normal due to Pacific storms during the first half of June and monsoon thunderstorms in Harney, Baker, and southwest Owyhee Counties in August. Precipitation was below or much below normal across Baker County Oregon and most of southwest Idaho. Temperatures were above or much above normal across most of the region.
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