Much of the eastern half of the country saw widespread snow and rain combined with record-breaking cold during the Drought Monitor week ending Tuesday, November 12. The combination helped alleviate short-term dryness and drought in much of Texas, the Ohio River Valley, the Mid-Atlantic, and Southeast.
Meanwhile, the dry pattern continued across California and the Great Basin, leading to a deterioration in conditions. Six weeks into the water year, many parts of the country have yet to see any precipitation, while higher than normal temperatures have kept evaporative demand high.
The trend toward improvements continued this week in the Southeast in response to another round of beneficial rain and below-normal temperatures. The combination helped to lessen rainfall deficits, replenish soil moisture, and increase streamflow. In response, one-category improvements were made in areas of severe drought (D2), moderate drought (D1), and abnormal dryness (D0) in South Carolina, Georgia, and Alabama.
While the Florida Panhandle benefited from the rain and saw improvements, south and central Florida did not. Continued above-normal temperatures and rainfall shortages (3 to 10 inches over the last 90 days) led to the introduction of abnormal dryness (D0).
Another week of cool weather combined with snow and rain helped alleviate dryness and drought across the region. Ohio and Indiana saw the removal of the remaining pockets of abnormal dryness (D0).
Improvements in Kentucky included the elimination of moderate drought. Reports from the state coordination team indicate recovery to streamflow and soil moisture and the removal of the state’s drought declarations.
Weather this week in the High Plains was marked by temperature swings ranging from 4 to 16 degrees above normal on Saturday, November 9th to 11 to 29 degrees below normal on Tuesday, November 11th. Most of the region less than 0.5 inches of precipitation.
The only changes to this week’s map were in Kansas and Colorado. In Kansas, the west-central region saw the expansion of abnormal dryness (D0) and the southwest saw small degradations in moderate (D1) and severe (D2) drought as precipitation deficits continue to build.
Colorado saw a one-category improvement in the north-central part of the state based on feedback from the state coordination group and the cold, snowy start to the winter. SNOTEL sites in the region indicate that the water year is starting off with snow water equivalent values ranging from near to more than 200 percent of normal.
Widespread rain and cooler than normal temperatures across the region led to one-category improvements in southeast Tennessee, west-central Oklahoma, and much of Texas. Improvements in Tennessee are supported by precipitation, streamflow, and soil moisture. In Oklahoma, the northern edge of abnormal dryness was trimmed as precipitation deficits in this area have been erased out to six months.
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Many of the drought-affected areas in Texas saw weekly precipitation that exceeded 300 to 600 percent of normal, resulting in the elimination of extreme drought (D3) in the northern part of the state and overall reductions to the other categories. The southern part of the state also saw broad areas of improvement.
Note that the designation “SL” was added to the southwest region to reflect the short- and long-term nature of the precipitation deficits and impacts.
Analysis and discussions regarding the map’s depiction in the West focused on the effects of above-normal temperatures combined with a dry monsoon season in Arizona and New Mexico and a lack of precipitation to start the water year in parts of California, Nevada, and Utah.
Coordination with state monitoring groups led to the expansion of D0 across the southern two-thirds of California and central Nevada; expansion of moderate drought (D1) in southern California, southern Nevada, and Utah; and severe drought (D2) in southern Nevada, Utah, and northwest Arizona.
While reservoirs remain high, numerous indicators support dryness, including 60-day precipitation deficits, high evaporative demand, and vegetation health. In New Mexico, abnormal dryness (D0) and moderate drought (D1) expanded to the southeast.
Improvements continued this week in the Northeast with the removal of pockets of abnormal dryness (D0) from southeast New York, Pennsylvania, Delaware, and West Virginia. Recent rainfall combined with low temperatures have improved precipitation deficits, soil moisture, and streamflow.
Alaska, Hawaii, and Puerto Rico
No changes were made to the map in Alaska, Hawaii, or Puerto Rico this week. Reports from local experts in Hawaii and Puerto Rico noted that conditions remain aligned with last week’s status. In Alaska, below-normal precipitation in the south-central part of the state and northern Panhandle weren’t enough to erase longer-term deficits.
Over the next week, generally warmer than normal temperatures are expected in the western U.S. Farther east, the cold, polar air mass responsible for the early week chill in the central and eastern U.S. will exit to the east, leaving more moderate temperatures in its wake.
Some rain is forecast by the National Weather Service Weather Prediction Center in east Texas on Thursday, with rain also occurring in the Southeast through Monday. Elsewhere, some precipitation is also expected in the Pacific Northwest, and generally dry conditions are forecast elsewhere.