Drought monitor: August 3, 2010

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Click on the thumbnail graphic to see this week’s map.

Here’s a report from Cattle Network. From the article:

The Southwest: Another surge of monsoonal moisture dumped widespread 2 to 4 inches of rain on the eastern three-fourths of Arizona, the western two-thirds of New Mexico, southern Utah, and most of Colorado, allowing for a general one-category reduction of drought in New Mexico, southern and central Arizona, and a small portion of southern Colorado. Arizona July precipitation exceeded 150 percent of normal at many central and eastern locations, and the majority of the Mogollon Rim has been wet, with many locations indicating one of the top 5 wettest Julys ever. Even northeastern Arizona (northern Navajo and Apache Counties) received 1.5 to 2 inches of rain this week, resulting in the residual D2 area to be shifted farther west and shrunk (now in northeastern Coconino and northwestern Navajo Counties). Improvements were made to areas with more than 2 inches of rain for the second consecutive week. In southern Colorado, although 1 to 3.5 inches of rain fell, only minor improvements were made since the Water Year-to-Date (since October 1, 2009) and 3-month percentiles justified D0, especially in San Juan, Hinsdale, and Huerfano counties. Farther west, however, the moisture failed to reach most of western Arizona, southeastern California, and southern Nevada, and D0 slightly expanded westward. The AH impact line was modified in northwestern Arizona (to H) where showers made it into eastern Mohave and western Coconino counties.

Great Basin and Rockies: Light showers (0.2 to 0.7 inches) fell on the eastern Great Basin and Rockies, not enough to warrant removal of D0, but adequate enough not to degrade conditions. In the western Great basin, seasonable dryness maintained D0-D2, with unseasonably cool weather in California and along the Pacific Coast. The exception to this was in west-central Colorado where 1 to 3 inches of rain alleviated D0 in Grand, western Summit, and northern Eagle Counties where surpluses exist out to 6-months.

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