According to the National Weather Service (NWS) National Operational Hydrologic Remote Sensing Center (NOHRSC) regional snow analysis (12/6) reports that the Northeast Region is 64.9% covered by snow with an average snow depth of 3.7 inches and a maximum depth of 25.2 inches, while the Southern Great Lakes Region (which includes areas downwind of Lake Erie and Lake Ontario) was 21.7% covered by snow. In other parts of the region, some locally heavy snowfall accumulations (up to 18 inches in northern Maine) were observed in the Adirondacks of Upstate New York, northern Vermont and New Hampshire, and Maine. In contrast, areas of Abnormally Dry (D0) expanded in southeastern Pennsylvania in response to dry soils and short-term dryness (past 30-60 days). Northeastįor the week, some minor improvements were made on the map in Upstate New York, New Jersey, and Maryland in response to improving conditions during the past 30-60-day period. In areas of the Hawaiian Islands, locally heavy showers and flash flooding were observed last week in association with a Kona Low system that helped to ease drought conditions across the island chain. In areas of the Midwest, Great Lakes, and northern New England, light-to-moderate snowfall accumulations (ranging from 1 to 12+ inches) were observed during the past week with the highest totals (12+ inches) reported in areas of Vermont, New Hampshire, and Maine. According to the Natural Resources Conservation Service (NRCS) SNOTEL network (12/5), region-wide (2-digit HUCs) percent of median snow water equivalent (SWE) levels were as follows: Pacific Northwest 73%, Souris-Red-Rainy 70%, Missouri 73%, California 73%, Great Basin 102%, Upper Colorado 86%, Lower Colorado 78%, Rio Grande 65%, and Arkansas-White-Red 64%. In California, snowpack conditions continue to lag normal levels with the statewide snow water equivalent (SWE) at 29% of normal (12/5). Likewise, high-elevation snows were observed in the mountains of the Southwest including along the Mogollon Rim and Chuska Mountains of Arizona as well as in the Nacimiento and Sangre de Cristo ranges of New Mexico. Further inland, higher elevations in central Idaho and northwestern Montana ranges, Northern Great Basin ranges, the Tetons and Wind River ranges in northwestern Wyoming, the Wasatch Range in northern Utah, and the Colorado Rockies all received significant snowfall accumulations that helped to boost snowpack levels closer to normal to above normal levels. Some of the highest precipitation accumulations (8-15+ inches liquid) were observed in the Olympic Mountains, Cascades of southwestern Washington, and in the coastal ranges of west-central Oregon. In the Pacific Northwest, a series of atmospheric rivers delivered heavy rainfall to western Oregon and Washington as well as significant mountain snow to the higher elevations of the Olympic Peninsula, Cascade Range, and the Blue Mountains of northeastern Oregon. In the South and Southeast, heavy rains over the weekend impacted areas of the Mid-South, and Gulf Coast states with isolated locations in southern Louisiana and the Florida Panhandle receiving up to 7-inch accumulations. Drought Monitor (USDM) week saw continued improvements on the map in drought-affected areas of the South, Southeast, and Pacific Northwest.
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