A wet reset undone in a week across Iowa County

The ground under Savanna Section has flipped fast this summer. Weekly U.S. Drought Monitor reports for Iowa County held at zero percent abnormally dry for three straight weeks in July, the payoff of a wet stretch that finally reset the county after nearly ten months of some degree of dryness or drought stretching back to the previous October.¹ Then, in the first week of August, 83.58 percent of the county jumped into abnormally dry classification, and it has stayed there, essentially unchanged, for three consecutive weekly reports since.¹ Nothing has crossed into moderate drought yet, but the shift itself is the notable part: a full wet reset undone within about a week of the rain stopping.¹ The same week last year the county sat at zero percent, so this year's dry snap has no analog from the prior season at this point in summer.¹

What that classification does not tell us is whether anything on the ground has responded yet. The Drought Monitor is the only signal in the record here. There is no soil-moisture series for the county, no field observations logged since the shift, and a check of nearby USGS gauges returned no discharge readings for the period at all — so the honest position is that we know the classification moved and not much else.

It is still worth watching, and it is worth being specific about where. Soil moisture is what governs seed-set in the tallgrass and the water moving through the smaller creeks and seeps that support aquatic insect emergence this time of year, which is why a late-summer swing can matter well before it registers as drought proper. Prairie plants with deep root systems — the kind that anchor this landscape's blazing-stars, prairie dock, and rosinweeds — are generally understood to buffer short dry spells better than shallow-rooted species, and the wetter microhabitats scattered through the savanna mosaic, seeps, sedge pockets, low swales, would be the first places to check for visible stress if it shows up. Whether any of that is underway right now is an open question, not a finding.

The Driftless Area Land Conservancy works this stretch of southwestern Wisconsin, within the broader Driftless Area, and is worth knowing as one of the groups keeping an eye on how these landscapes hold up through swings like this one.