#Drought news: Slight improvement in the San Juans, San Luis Valley, degradation in Adams and El Paso counties, and along the Great divide into #Wyoming

Click on a thumbnail graphic to view a gallery of drought data from the US Drought Monitor.

Click here to go to the US Drought Monitor website. Here’s an excerpt:

Summary

A strong upper-level low resulted in surface low development along the western Gulf Coast on January 3. This low pressure system then tracked northeast to the mid-Atlantic by January 5, maintaining excessive wetness across much of the lower Mississippi Valley and Southeast. However, southern Florida remained mostly dry as short-term dryness worsened. Onshore flow returned to the West Coast by January 5, resulting in rain and high-elevation snow. Although widespread precipitation occurred across coastal areas of Washington, Oregon, and northern California, 7-day amounts averaged below normal north of Eureka, California. Above-average precipitation amounts were observed across the southern half of California and the Southwest. According to the Natural Resources Conservation Service (WYTD), snow water equivalent (as of January 7) is at or slightly below normal across Arizona and New Mexico basin-wide for the water year. As an area of upper-level low pressure shifted east across the western U.S., a surface low and associated warm front crossed the Midwest and Great Lakes on January 7. The heaviest weekly amounts (more than 1 inch, liquid equivalent) were recorded from Wisconsin north to the upper peninsula of Michigan…

High Plains

Following a week of widespread snowfall, mostly dry weather prevailed across the northern and central Great Plains. Based on a reassessment of departure from normal precipitation at varying time ranges (60 days to 6 months), moderate drought was reduced in coverage across North Dakota and limited to areas with the largest deficits. Elsewhere, across the Dakotas, no changes were made to the ongoing D0 areas…

West

Beneficial precipitation, with locally heavy high-elevation snow, continued across the Four Corners region into the first week of the New Year. Based on recent precipitation, near to above-average precipitation during the past 6 months, and SPI values near normal, abnormal dryness was removed from southeast Arizona with a slight reduction in the coverage of D1 and D2 where recent amounts were heaviest. Small areas of improvement also were made across southwest Colorado. Cortez in Montezuma County has received about an inch above normal precipitation since the beginning of the water year, supporting an upgrade from D4 to D3. In the San Luis Valley, recent precipitation prompted an improvement from D3 to D2. These areas of improvement are limited to the lower elevations since snowpack remains slightly below normal at the higher elevations. During the past week, local precipitation amounts exceeded 1 inch (liquid equivalent) in Unitah County, Utah where D3 was improved to D2. Farther to the north and east, little to no precipitation and above-average temperatures resulted in an increase in D1 across Adams and El Paso counties of north-central Colorado and an expansion of D0 from north-central Colorado into southern Wyoming. Abnormal dryness (DO) was removed from north-central Montana in early December. However, it has remained dry since that time and D0 may need to be reintroduced in the coming weeks.

Onshore flow continued to bring widespread rain and high-elevation snow to the West Coast during the first week of the New Year. However, ACIS indicates that precipitation has averaged below normal during the past 30 days across a majority of the Pacific Northwest and California. Santa Barbara and Ventura counties received another round of heavy precipitation (locally more than 2 inches) this past week, producing mud slides in burn-scarred hillsides. An increase in water storage on Cachuma Reservoir was noted. Based on recent precipitation and 12 to 24-month SPIs, a decrease in the coverage of D3 was made to these counties in southern California. According to SNOTEL, basin snow water content (SWE) remains below 75 percent of normal across the southern Cascades where D2 to D3 is designated. Recent heavy precipitation and only small precipitation deficits at 60 days prompted removal of abnormal dryness across parts of western Washington…

South

Widespread moderate to heavy precipitation (0.5 to 2.5 inches, liquid equivalent) fell across the lower Mississippi Valley and parts of the southern Great Plains for the second consecutive week. The recent precipitation during an ideal time of year for soil moisture recharge resulted in the removal of any lingering abnormal dryness (D0) across northeast Oklahoma and northwest Arkansas. However, the long-term drought area in the Texas Panhandle remained mostly west of the heavier precipitation and south Texas remained dry during the past week. Short-term abnormal dryness (D0) and moderate drought (D1) were expanded in southern Texas where 90-day deficits ranged from 1 to 4 inches.

One week drought change map through January 8, 2019.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.