Story Originally from the National Weather Service Milwaukee/Sullivan http://www.crh.noaa.gov/news/display_cmsstory.php?wfo=mkx&storyid=85310&source=0
Severe Drought Conditions (D2) have been expanded northward to include almost all of Marquette, Green Lake, and Fond du Lac counties, as well as northern Sauk, southern Sheboygan, and northern Ozaukee counties. A severe drought is likely to result in some crop and pasture losses. It may result in water restrictions as well.
You may be wondering why drought conditions have been reported to worsen one day after the region saw its first widespread and heavy rainfall in over a month. The Drought Monitor products are developed on a weekly basis, using data available up to Tuesday. The product is compiled and becomes available on Thursday. Wednesday's storm and rain event was therefore not included in this week's report. However, though a large portion of the Wisconsin areas in the Extreme Drought category received well over 1 inch of rain with the event, the region has been deprived of so much rainfall (yearly totals 6 or 7 inches below normal) that even heavy thunderstorm rains will not fully alleviate the drought. Some improvement in overall conditions is possible, but cannot be guaranteed. It is important to remember that heavy rain can fall so quickly that the ground is not able to absorb all of it, and some remains ponded on the ground where it may evaporate before soaking in. In urban areas, some may run off into storm drains and sewers instead of going right into the soil.
The warm temperatures and low relative humidities expected across southern Wisconsin this weekend will certainly not help provide any additional relief. The chance for showers and thunderstorms on Sunday will not have much impact on the status of the drought. Coverage will be spotty and amounts generally much too small to help significantly.
The Abnormally Dry (D0) conditions persist across central Wisconsin, in a band from Buffalo and Trempealeau counties eastward to southern Marathon County and then into the Green Bay metro area. Abnormally dry conditions indicate short-term dryness slowing planting and growth of crops or pastures.