Little change was made to Louisiana this week since the previous USDM map matches up well with the indicators (NDMC short-term blend and soil moisture) and many areas received at least a 0.5 inch of precipitation this past week. Along with this dryness, persistent above-normal temperatures have led to high evapotranspiration rates and worsening impacts to agriculture and high fire danger. According to the NCEI, numerous counties in the southern half of Mississippi had their driest August on record and many of those counties have received less than 0.5 inch of precipitation during the first ten days of September. The rapid onset and intensification of drought continues throughout central and southern Mississippi. Venice, Florida is having their driest year-to-date on record. Severe (D2) to extreme (D3) drought was expanded slightly south along the coast of southwestern Florida where year-to-date precipitation deficits continue to increase. 30 to 60-day SPEI, 28-day average streamflow, and soil moisture resulted in a broad 1-category degradation to the southern third of Alabama, southwestern Georgia, and the Florida Panhandle. Despite the locally heavy precipitation across northern Virginia and the Shenandoah Valley, 28-day streamflows remain below the 10th percentile in many counties and support a continuation of severe drought (D2). Similar to the Northeast Region, a 1-category improvement was made to areas that received the heaviest precipitation this past week and there was a positive response among the indicators. SoutheastĪ slow-moving low pressure system resulted in rounds of heavy precipitation to the Southern Mid-Atlantic States. Based on NDMC’s drought blends, the drought impact for the Central Appalachians and Mid-Atlantic was changed from “S” (short-term) to “SL” (short and long-term). Northern West Virginia missed out on this past week's precipitation and there was a small increase in moderate drought (D1) for that area. A 1-category improvement was made to areas that received the heaviest precipitation (more than 1.5 to 2 inches) and there was a positive response among the indicators. NortheastĪ slow-moving low pressure system resulted in rounds of showers and thunderstorms across the Central Appalachians and Northern Mid-Atlantic. Monsoon rainfall began to decrease throughout the Four Corners region and Southwest during early September, while seasonal dryness prevailed along the West Coast. Since early August, persistent excessive heat coupled with a lack of adequate rainfall led to a rapid onset and intensification of drought from Texas eastward to the Lower Mississippi Valley and parts of the Southeast. Farther to the south, above-normal temperatures continued across the southern Great Plains and western Gulf Coast. In the wake of a cold front, 7-day (September 5 to 11) temperatures averaged near to slightly below normal for the Northern Great Plains and Upper Midwest. Improvements were made to areas that received the heaviest amounts. Widespread precipitation amounts of 0.5 to 2 inches (locally more) were observed across much of the Great Plains, Upper Mississippi Valley, and East.
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