Minnesota Drought Situation Report - July 10, 2007

Drought Monitor - July 3, 2007
Drought Monitor Map
Drought Monitor Legend

Drought Status
The latest U. S. Drought Monitor places portions of north central, northeastern, east central, and south central Minnesota in the Moderate Drought category. Much of the remainder of the eastern three quarters of Minnesota is depicted as being Abnormally Dry. The U. S. Drought Monitor index is a blend of science and subjectivity where intensity categories are based on several indicators.

Last week's weather:
Precipitation last week was generally light across most of western and northern Minnesota. However, many locations in east central Minnesota received between one and two inches of rain for the week. This was welcome precipitation in one of Minnesota's driest areas. It was a warm week with temperatures averaging three to five degrees above average. Many communities reported temperatures above 90 degrees at least once during the week. Weekly Precipitation Map

Seasonal weather overview:
Dryness has been entrenched across much of the southern two thirds of Minnesota for much of May, June, and early July. The timing of the dry weather has been unfortunate. The period from May through September is historically the wettest time of the year in Minnesota. Long-term average rainfall rates during this time interval are around one inch per week. Very dry weather, occurring during a time of year when ample rain is typical, leads to the rapid intensification of drought. The lack of precipitation, along with very high evaporation rates in June, has led to deteriorating crop conditions, low stream flows and lake levels, and increased the danger of wildfire.

Seasonal precipitation totals, departure, and ranking:
Rainfall totals since April 1 have been less than eight inches across much of the southern one half of Minnesota. Growing season rainfall totals have deviated negatively from historical averages by more than three inches across much of east central, central, southwestern, and south central Minnesota. Seasonal rainfall deficits exceeding four inches are reported along a band extending from the metropolitan area through Mankato and southwestward into Fairmont. Spotty four-inch deficits are also reported in central Minnesota, and in southwestern Minnesota. When compared with other seasonal rainfall totals to date in the historical database, this year's rainfall totals for the period rank below the 20th percentile (one year in five) in the driest areas.

April 1 to July 9 2007 Precipitation Map April 1 to July 9 2007 Precipitation Departure Map April 1 to July 9 2007 Precipitation Ranking Map

Sector briefs:

More drought information resources are found at http://climate.umn.edu/doc/journal/drought_information_resources.htm.

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URL: http://climate.umn.edu/doc/journal/drought_situation_report_2007_070710.htm
Last modified: July 10, 2007