STATISTICS
Week | Date | None | Abnormally Dry | Moderate | Severe | Extreme | Exceptional | DSCI |
---|---|---|---|---|---|---|---|---|
Current | 2024-04-23 | 23.52 | 76.48 | 58.00 | 26.82 | 2.66 | 0.00 | 164 |
Last Week | 2024-04-16 | 14.71 | 85.29 | 66.20 | 30.68 | 7.43 | 0.00 | 190 |
Three Months Ago | 2024-01-23 | 3.67 | 96.33 | 80.08 | 60.24 | 24.08 | 0.00 | 261 |
Start of Calendar Year | 2024-01-02 | 2.77 | 97.23 | 83.41 | 65.09 | 35.18 | 0.00 | 281 |
Start of Water Year | 2023-09-26 | 0.01 | 99.99 | 95.65 | 67.41 | 25.00 | 1.17 | 289 |
One Year Ago | 2023-04-18 | 37.97 | 62.03 | 31.90 | 15.54 | 1.51 | 0.57 | 112 |
DISCUSSION
This U.S. Drought Monitor (USDM) week saw improvements on the map in drought-affected areas of the Southwest, Northern Plains, and the Midwest while conditions deteriorated in areas of the Pacific Northwest, Eastern Plains of Colorado and Montana, Southern Plains, and the South. In the Pacific Northwest, a combination of factors (below-normal snowpack conditions, short-term dryness, low streamflows) led to expansion of areas of Abnormally Dry (D0) and Moderate Drought (D1) in western portions of Oregon and Washington. In Montana, poor snowpack conditions in the northwestern and west-central part of the state led to expansion of areas of Extreme Drought (D3) where some SNOTEL stations were reporting record or near-record low snow-water equivalent (SWE) levels. In the Southern Plains, drier-than-normal conditions during the past 30-90-day period in addition to low streamflows, declining soil moisture, and impacts to crops led to expansion of areas of Moderate Drought (D1) and Severe Drought (D2) in Oklahoma and Kansas. Conversely, wetter-than-normal conditions have prevailed during the past 30-60 days in portions of the Midwest leading to widespread improvements across drought-affected areas of Iowa, Minnesota, Wisconsin, and Michigan. Likewise, improvements were made on the map in areas of the Southwest (Arizona and New Mexico) in response to beneficial precipitation received across much of the region since the beginning of the Calendar Year (January 1). In California, snowpack conditions moving into late April (4/24) were near normal levels with the statewide snowpack at 97% of normal, according to the California Department of Water Resources. Elsewhere in the West, below-normal SWE levels have persisted in the mountain ranges of Washington, northern Idaho, Montana, and northeastern Wyoming. According to the Natural Resources Conservation Service (NRCS) SNOTEL network (4/23), region-level (2-digit HUCs) median SWE levels are as follows: Pacific Northwest 75%, Souris-Red-Rainy 76%, Missouri 80%, California 95%, Great Basin 108%, Upper Colorado 87%, Lower Colorado 145%, Rio Grande 78%, and Arkansas-White-Red 79%.