Regional Overview
January 2003 was dry across much of the country. Only the Pacific Northwest and a few parts of the northern Rockies were unusually moist. Most of the primary stations in Alaska and Hawaii had a drier than normal month. In Puerto Rico, most of the reporting stations were near to wetter than normal during the 4-week period ending January 31, but most were drier than normal for the most recent 8-week period.
The January dryness compounded the long-term drought conditions across much of the western U.S. and from the central Plains to the Great Lakes. Many of the drought areas of the east coast, which have benefited from four months of unusually moist weather (September-December 2002), saw a return to short-term dryness during January.
The long-term dryness is also evident in the pattern of snowfall anomalies. Season-to-date (July 1, 2002 - February 6, 2003) snowfall has totaled below the long-term average across much of the Far West, Great Plains, and Great Lakes regions.
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These overall conditions are evident in the following indicators:
A detailed review of drought conditions is available for the following regions and states:
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Western U.S. Drought
January marked the second consecutive wet month averaged across the Pacific Northwest, contributing to some improvement in drought conditions in the region, but long-term deficits remained. The month averaged much drier than normal for the West and Southwest regions.
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Moderate to extreme drought covered 75% of the western U.S. (Rocky Mountains to west coast) at the end of January. This makes the current drought the most extensive for this region since the drought of the 1930s. Of particular concern was the below-average mountain snowpack, as seen in snow course measurements and SNOTEL station snow water equivalent observations, and below-average reservoirs. The winter mountain snowpack is the source of spring meltwater which fills western reservoirs and is used for irrigation during the spring and summer growing seasons.
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A detailed review of drought conditions is available for several western states and regions.
Central U.S. Drought
A detailed review of drought conditions is available for several central U.S. states and regions.
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Eastern U.S. Drought
The dryness of January marked the end of a four-month wet spell for much of the east coast. Most areas here had recovered from the drought by the end of December, with only long-term hydrologic impacts (for example, low well levels) remaining. But January's dryness increased the moisture stress in many areas, with the Southeast region having the fourth driest January, regionwide, in the 109-year record. An exception is Maine, where four of the last six months have averaged drier than normal, statewide. Maine had the third driest January and fourth driest August-January in the 109-year record.
A detailed review of drought conditions is available for several eastern states and regions.
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Additional Contacts:
For all climate questions other than questions concerning this report, please contact the National Climatic Data Center's Climate Services Division:
Climate Services Division NOAA/National Climatic Data Center 151 Patton Avenue Asheville, NC 28801-5001 fax: 828-271-4876 phone: 828-271-4800 email: ncdc.info@noaa.gov
For further information on the historical climate perspective presented in this report, contact:
Richard Heim NOAA/National Climatic Data Center 151 Patton Avenue Asheville, NC 28801-5001 fax: 828-271-4328 email: Richard.Heim@noaa.gov
-or-
Jay Lawrimore NOAA/National Climatic Data Center 151 Patton Avenue Asheville, NC 28801-5001 fax: 828-271-4328 email: Jay.Lawrimore@noaa.gov
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