These conditions were especially notable across the West, northern Plains, Northeast, southern High Plains, and parts of Florida and the Midwest. The below-normal precipitation during June and for the last several months, and early melt of the below-normal winter mountain snowpack in the West, have resulted in low to record-low streamflow, low groundwater ( USGS and GRACE satellite observations) levels, and dry soil moisture ( SMOS satellite observations SPoRT satellite-based observations for 0-10 cm depth, 0-40 cm depth, 0-100 cm depth, 0-200 cm depth GRACE satellite-based observations for surface and root zone soil moisture the USDA Crop Condition and Soil Moisture Analytics soil moisture anomaly for topsoil and subsoil, CASMA soil moisture category for topsoil and subsoil, and field observations of topsoil moisture the satellite-based Vegetation Condition Index (VCI) the VegDRI and QuickDRI products and CPC, Leaky Bucket, NLDAS, and VIC models). The frequent anomalous ridging over the West and northern Plains to Northeast resulted in much warmer-than-normal monthly temperatures for these regions, with record warmth occurring in the West and Northeast.
The cooler air combined with cloudy skies and rain associated with the fronts and remnants of Tropical Storms Claudette and Danny to give these areas monthly temperatures that were near to cooler than normal. Cooler Canadian air behind the cool fronts lingered at times in the southern Plains to Southeast. But much of the West, central to northern Plains, and Northeast was drier than normal under the frequent ridging. These areas were wetter than normal for the month. The upper-level troughs dragged surface lows and fronts with them, and these brought rain to parts of the Southwest, southern Plains to Southeast, Midwest, and a few coastal areas of Oregon and Washington. Upper-level troughs and ridges migrated through the atmospheric circulation over the CONUS during June 2021, with ridging dominating.
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